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![]() ![]() 2) I receive a lot eMails and field many questions at synth related forums and also on Facebook. The most common question I get about problems with a synth has to do with errors when trying to load Patches and Tones. About 99.9% of the time, the problem always turns out to be a crappy MIDI interface. If you have a cheapo MIDI interface which looks similar to the one shown on the right... throw this piece of shit in the trash! Do It Now. Seriously! This thing is total junk and you get what you pay for. Inexpensive MIDI interfaces like this are unable to properly regulate the buffering of MIDI data. They will work fine with simple messages such as CC, Note On, Note Off, etc... however, when you try to send SysEx messages which are much longer, the SysEx data cuts off after only sending a few bytes. Investing in a higher quality MIDI interface will solve Load/Save errors and other communication problems |
U-20 RS-PCM = U-20 RE SYNTHESIZED - PULSE CODE MODULATION "The U-110 (or, rather, its unreleased prototype, the T-110) is the ancestor of almost all Roland's synths and workstations from 1991 onwards. This makes it one of the most significant synths ever released. The problem with the U‑110 was that its digital‑to‑analogue converters were rather noisy. This was cured in 1989 with the release of the U‑220, which sounded much more 'high‑end'... the U‑20... possibly the first affordable keyboard that you could take on stage to produce convincing piano, organ, strings, brass, drums... as well as many other pads, effects, leads, basses and other important sounds. Leaping from the back pages to the front of Roland's catalogues, the U‑20 was a winner." --- Sound On Sound, 2005 --- The most common praises about this keyboard are the realistic piano sounds within. In fact, some people made their U‑20 purchase decision based on Patch I‑11 Acoust Piano. If you go searching the Internet for the U‑20, you will find that this is one of those keyboards that people either really, really like... or totally despise. The U‑20, U‑220 and U‑110 are infamous as having some of the absolute worst user interfaces... ever. It's up there with the D‑110. The chaotic and cryptic Owner's Manual and the Red Epoxy Syndrome sealed the deal and quickly placed the U‑20 in a Top 10 List - "Most Hated Keyboards Of All‑Time". Personally, I really, really like this keyboard. It may be old technology, but I have been using it as my main keyboard controller since 1990, took it on the road for several live gigs, and it has always performed well. One of the sounds which shows off the versatility of this keyboard is Patch I‑83 Velo Combi. Playing the keyboard very soft will produce a piano sound, playing with medium velocity makes an ethereal Vox sound and playing the keys hard creates a Super Strings sound. Love it! A common user complaint is that the built‑in Arpeggiator does not send notes out via MIDI. This simply is not true. In fact, it is quite easy to setup the U‑20 to output Arpeggiator notes via MIDI (see page 92 of the Owner's Manual). Other complaints are faulty key sensors not triggering notes, slow response times, lackluster Aftertouch response and the dreaded Red Epoxy Syndrome. Issues with faulty key sensors appear after a couple decades of use. The fix is usually made by cleaning the contacts with distilled water and a Q‑Tip. Guy Wilkinson explains the cleaning process in detail at supersynthprojects.com. For the Red Epoxy Syndrome, one of my U‑20's is fine and the other two had a major meltdown... literally. I think it's a combination of where your U‑20 was on the assembly line queue and where your synth has been stored over the years. For issues with slow response times, see this section. The Aftertouch on both of my U‑20's is a definite problem. The Aftertouch on my Alpha Juno‑2, JX‑10 and S‑50 stopped being responsive over a period of time. It's a common problem and an easy fix for these three synths. After cleaning the Aftertouch strips on those synths, the problem was resolved immediately. I have seen documentation on the Internet about an Aftertouch mod for the U‑20 which involves changing some resistor values on the Bender Board but have not attempted this fix yet. From a repair standpoint on the U‑20, to me it looks like fixing the Aftertouch is a lost cause (see Aftertouch below) |
* * * FAQ: U-20 * * * | |
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Where Can I Find Owner's Manuals For The U‑20, U‑220, U‑110, D‑70, and Rhodes Model 660/760 Synths? | ![]() The U‑20, U‑220, and U‑110 Owner's Manuals are some of the worst synthesizer manuals ever written, IMO. The steps are unorganized and extremely difficult to follow. The complicated menu architecture of the U‑20 deserves a better guide but this is all that is available online ![]() ![]() ![]() ![]() http://midimanuals.com/manuals/roland/d-70/owners_manual/d-70_om.pdf FREE Owner's Manuals for almost every synthesizer and effects device can be found at ![]() My webpages offer a little info about the D‑70 but not much. There is a good magazine article on the Utilities page and some basic info about the PCM ROM and RAM cards. For more detailed info about the D‑70, visit the Roland D‑70 Resource Page ![]() |
Where Can I Find Service Manuals And Schematics? | ![]() ![]() ![]() Gigantic collection of Service Manuals w/schematics at this link. The highest quality PDF's on the Internet ![]() |
What Do The "U‑Series" Modules and Keyboard and Sound Like? | ![]() ![]() ![]() All 64 factory preset Patches and a selection of Timbres ![]() |
Why Were The U‑20, U‑220 And U‑110 Rompler's So Popular In The 1990's? | |
U-20 Video Review by AudioPilz U-110 Video Review by AudioPilz |
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How Do I Fix A U‑20 Or U‑220 When Garbage Characters Are Displayed On The LCD Screen And The Keyboard Does Not Play Notes? | ![]() If the characters showing on the LCD are a mix of symbols, letters and numbers, chances are good this is an easy fix. It's probably one of these three problems; |
1) The internal backup battery has died and all the Patches have turned into random bits of data Solution: Replace The Battery and then Reload The Factory Preset Patches (or an alternate Patch bank) 2) A corrupted SysEx file was loaded or a SysEx file was interrupted during the load process Solution: Reload the Factory Preset Patches (or an alternate Patch bank) 3) The system was initialized, a circuit board was unplugged, inactivity while being stored in the attic, etc... Solution: Reload the Factory Preset Patches (or an alternate Patch bank) I'm always amazed at how Roland designed some behaviors of the U‑20, U‑220 and other synths. This was considered as "normal" operation... reset the synth, everything on the screen turns into garbage and the keyboard is useless. Not even a one line courtesy message like, "Load Patches". Yay! Go Roland ![]() ![]() The Bad News If the LCD display shows a bunch of thin vertical lines, the problem is more serious and will most likely require a LCD replacement screen or more extensive servicing by a Roland Authorized Service Center Last Ditch Effort ![]() U-20 Power on and wait 15 seconds Press [ EDIT ] Press the [ ◅ ] LEFT CURSOR five times then press [ ENTER ] Press the [ ◅ ] LEFT CURSOR three times then press [ ENTER ] Press the [ ▻ ] RIGHT CURSOR two times then press [ ENTER ] Press the [ △ ] VALUE UP eight times then press [ ENTER ] You should now see some text on the LCD If you don't see anything on the screen then the LCD is probably toast If you do see some text, Initialize The Synth Back To Factory Fresh Settings U-220 Power on and wait 15 seconds Press [ EDIT ] Press the [ ◅ ] LEFT CURSOR three times then press [ ENTER ] Press the [ ◅ ] LEFT CURSOR four times then press [ ENTER ] Press the [ ▻ ] RIGHT CURSOR two times then press [ ENTER ] Press the [ △ ] VALUE UP eight times then press [ ENTER ] You should now see text on the LCD If you don't see anything on the screen then the LCD is probably toast If you do see some text, Initialize The Synth Back To Factory Fresh Settings |
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The LCD In My U‑220 Is Broken. How Do I Replace It? | ![]() U-220 With a $5 buydisplay.com LCD Installed
Top: Model ERM2402FS-1 (BLACK/WHITE) Middle: Model ERM2402SBS-1 (WHITE/BLUE) Bottom: ERM2402SBS-1 (WHITE/BLUE - Side View) ![]() |
How Do I Restore The U‑20 Factory Preset Patches Or Load An Alternate Set Of Patches? | To restore the Factory Preset Patches, you will need a Mac, PC or LINUX computer with a generic SysEx loader program. It is also possible to quickly restore the Factory Preset Patches if you have an optional RAM Data Card. Info about restoring Factory Preset Patches from an optional RAM Data Card here [ WARNING!!! Everything in the internal memory will be erased! ] To perform a Bulk Load 1) Use your computer's SysEx program to SEND the factory preset file U-20_Factory_Presets.SYX. The load process is automatic 2) The LCD display will show Receiving Exclusive. during the load process 3) If the Patches won't load or if you receive a MIDI Buffer Full! error message, try adjusting the speed of your SysEx program or check the MIDI interface you are using (See * Troubleshooting Bulk Load Errors) If the Bulk Load procedure did not work, verify the following: Connect MIDI Out and MIDI In cables between the U-20 and the computer Is the U-20 set to the correct SysEx Channel and is SysEx turned on? Press [ JUMP ] [ BANK 1 ] Press [ ▻ ] RIGHT CURSOR Use [ △ ] VALUE [ ▽ ] to set SysEx Device ID = 17 Press [ ▻ ] RIGHT CURSOR twice Press [ △ ] VALUE UP to set Rx SysEx = ON Press [ KEYBOARD ] + [ SOUND ] at the same time to resume normal play mode Note: Verifying SysEx is only needed once (until the next time SysEx Device ID or Rx SysEx are changed) Note: To change values faster, instead of using [ △ ] VALUE [ ▽ ] buttons, you can use the C2/VALUE Slider Knob to increase/decrease * Troubleshooting Bulk Load Errors ▻ The MIDI Send and Receive settings on your computer might be too fast for a U‑Series synth MIDI buffer to handle. The U‑Series synths were designed back in Medieval times when the processor speed of a home computer was only 20MHz... much slower than the models of today at 4GHz. Try setting the MIDI transmit, Pause and Timeout speeds in your computer's SysEx program to smaller values. For my U‑20 setup and U‑220 setups, I use the following speeds with my SysEx file transfer program for the Mac called SNOIZE Transmit Speed = 2,000 Bytes/sec Pause Between Played Messages = 10ms SysEx Receive Timeout = 380ms ▻ Do you have two MIDI cables connected? Two are required because SysEx uses both MIDI IN and MIDI OUT ▻ Another thing to check is the MIDI INTERFACE connected to your computer. Some inexpensive MIDI interfaces which look similar to this one are unable to properly regulate the buffering of MIDI data. Some of these inexpensive MIDI interfaces will work fine with simple messages such as CC, Note On, Note Off, etc... However, when you try to send SysEx messages which are much longer, the SysEx data cuts off after only sending a few bytes. Investing in a higher quality MIDI interface may solve Load/Save errors and other communication problems |
How Do I Restore The U‑220 Factory Preset Patches Or Load An Alternate Set Of Patches? | The process for loading Patches into the U‑220 is automatic. When a request from a PC, a Mac or a hardware sequencer sends a set of 64 Patches to the U‑220, the U‑220 will acknowledge and start to receive the Patch data. The U‑220 LCD will show "Receiving SysEx." and the MIDI MESSAGE LED above the power switch will blink rapidly Before transferring a SysEx file, ensure you have the following set on your U‑220: Rx Control Ch=01 RxSysEx = ON SysEx Device ID=17 To verify these settings are correct, power on the U‑220 and wait 15 seconds Press [ EDIT ] Button Press the [ ◅ ] LEFT or [ ▻ ] RIGHT CURSOR button and select Setup Press [ ENTER ] button Press the [ ◅ ] LEFT or [ ▻ ] RIGHT CURSOR button and select MIDI Press [ ENTER ] button Press the [ ◅ ] LEFT or [ ▻ ] RIGHT CURSOR button and select Rx Control Ch Press the [ △ ] UP or [ ▽ ] DOWN VALUE button and change Rx Control Ch=01 Press the [ ◅ ] LEFT or [ ▻ ] RIGHT CURSOR button and select Rx SysEx Press the [ △ ] UP or [ ▽ ] DOWN VALUE button and change Rx SysEx = ON Press the [ ◅ ] LEFT or [ ▻ ] RIGHT CURSOR button and select SysEx Device ID Press the [ △ ] UP or [ ▽ ] DOWN VALUE button and change SysEx Device ID=17 Press the [ EXIT ] button three times Load the U-220 Factory Patch SysEx file into your SysEx file transfer program (i.e. Snoize, MIDI‑OX, etc...) Use your SysEx program to transfer the SysEx file to the U‑220 The U‑220 LCD display will show "Receiving SysEx." and the MIDI MESSAGE LED will blink rapidly Troubleshooting Transfer Errors ▻ One problem you might encounter is the 'MIDI Buffer Full!' error message. This, and other solutions, are shown in the section above called Troubleshooting Bulk Load Errors |
How Do I Save All Of The Internal Patches And Timbres Of A U‑20 / U‑220? | To save all 64 Patches and 128 Timbres, you will need a Mac, PC or LINUX computer with a generic SysEx saver program To Perform A Bulk Dump On The U‑20 Press [ DATA ] then use the [ ▻ ] RIGHT CURSOR to select Bulk and press [ ENTER ] Press the [ ▻ ] RIGHT CURSOR to select Internal and press [ ENTER ] At this point, initiate your computer's SysEx program to capture the incoming SysEx data stream Use [ ▽ ] VALUE DOWN to select All and press [ ENTER ] The LCD display will show"Transmitting Sysex."during the Bulk Dump process When the Bulk Dump process has finished, the LCD display will briefly show"Function Complete." Use your computer's SysEx program to save the Bulk Dump as a *.SYX file Press [ KEYBOARD ] + [ SOUND ] at the same time to resume normal play mode To Perform A Bulk Dump On The U‑220 Press [ DATA ] then use the [ ▻ ] RIGHT CURSOR to select Bulk and press [ ENTER ] Press[ ▻ ] RIGHT CURSOR to select All and press [ ENTER ] and the screen displays "Data/Bulk/All" twice At this point, initiate your computer's SysEx program to capture the incoming SysEx data stream Press [ ENTER ] again and the LCD display will show "Transmitting Sysex." during the Bulk Dump process When the Bulk Dump process has finished, the LCD display will briefly show "Function Completed." Use your computer's SysEx program to save the Bulk Dump as a *.SYX file Press [ EXIT ] three times to resume normal play mode If the Bulk Dump procedure did not work, verify the following* Connect MIDI Out and MIDI In cables between the U-20 and the computer Is the U-20 set to the correct SysEx Channel and is SysEx turned on? Press [ JUMP ] [ BANK 1 ] Press the [ ▻ ] RIGHT CURSOR Use [ △ ] VALUE [ ▽ ] to set SysEx Device ID = 17 Press the [ ▻ ] RIGHT CURSOR twice Press [ △ ] VALUE UP to set Rx SysEx = ON Press [ KEYBOARD ] + [ SOUND ] at the same time to resume normal play mode * Note: Verifying SysEx is only needed once (until the next time SysEx Device ID or Rx SysEx are changed) One problem you might encounter is the 'MIDI Buffer Full!' error message. Changing your transmission speed may solve this. The solution is shown two sections above. Look for Troubleshooting Bulk Load Errors |
I Can't Get The U‑20 To Communicate With My Computer When Using A Librarian, SysEx Program Or Sequencer. What Should I Check? | NOTE: Sometimes, the MIDI send and receive settings on a computer are too fast for the U‑20 MIDI buffer to handle. If you experience communication errors such as MIDI Buffer Full!, try setting the MIDI buffer size in your computer's SysEx program to a smaller value Is the U-20 set to SysEx Device ID = 17? Press [ JUMP ] [ BANK 1 ] Press the [ ▻ ] RIGHT CURSOR Use [ △ ] VALUE [ ▽ ] to set SysEx Device ID = 17 Is the U-20 set to Rx SysEx = ON? Press [ JUMP ] [ BANK 1 ] Press the [ ▻ ] RIGHT CURSOR twice Press [ △ ] VALUE UP to set Rx SysEx = ON Press [ KEYBOARD ] + [ SOUND ] at the same time to resume normal play mode Is the computer Sound Card, MIDI Controller, SysEx Librarian, etc... set to MIDI Channel 1? Is the computer Sound Card, MIDI Controller, SysEx Librarian, sending MIDI data to the U‑20? Make sure the patch librarian or SysEx program can send and receive SysEx data to and from the U‑20 Do you have two MIDI cables connected? Two are required because SysEx uses both MIDI IN and MIDI OUT Another thing to check is the MIDI INTERFACE connected to your computer. Some inexpensive MIDI interfaces which look similar to this one are unable to properly regulate the buffering of MIDI data. Some of these inexpensive MIDI interfaces will work fine with simple messages such as CC, Note On, Note Off, etc... However, when you try to send SysEx messages which are much longer, the SysEx data cuts off after only sending a few bytes. Investing in a higher quality MIDI interface may solve Load/Save errors and other communication problems |
How Do I Change The Internal Back‑Up Battery? | ![]() See Internal RAM Test on this page I recommend that you take your keyboard to a Roland Authorized Service Center because installing a new battery is a tedious task. Out of 12 synths, samplers and keyboards, replacing the battery on a U‑20 was the most difficult one I have encountered to date. But...... if you're a real sicko like me and insist on saving pennies because you have that foolish "I can do that myself" attitude...... then...... detailed instructions are available. A big advantage of taking it to a Roland Authorized Service Center is that if they accidentally "pop" an IC because of static discharge, the cost is on them; ![]() |
How Do I Initialize The U‑20, U‑220 or U‑110 And Return It To A State Of "Factory Fresh"? | !!! WARNING !!! This Will Render Your Synth Unplayable Until Patches Are Reloaded. Everything In The Internal Memory Will Be Erased. Everything... As In EVERYTHING! Back-up Your Patches Before Initializing Your Synth ![]() U-20 Factory Reset (see WARNING!!!) Press [ PART ] and [ RHYTHM ] simultaneously to enter ROM Play Mode While holding [ MARK ] and [ JUMP ], press [ ENTER ] for Test Mode While holding [ JUMP ], press [ NUMBER 7 ] and the screen displays "15. Memory Initialization" Press [ ENTER ] Press [ △ ] VALUE UP to confirm While holding [ JUMP ], press [ EXIT ] and repeat to exit Test Mode Load The U-20 Factory Preset Patches via SysEx or RAM Data Card U-220 Factory Reset (see WARNING!!!) Press [ JUMP ] and [ VALUE Δ ] simultaneously to enter ROM Play Mode While holding [ MARK ] and [ JUMP ], press [ ENTER ] for Test Mode While holding [ MARK ], press [ PART INST ◅ ] and the screen displays "11. Memory Initialize" Press [ ENTER ] Press [ △ ] VALUE UP to confirm and the screen briefly displays "Function Completed." While holding [ JUMP ], press [ EXIT ] and repeat to exit Test Mode Load The U-220 Factory Preset Patches via SysEx or RAM Data Card U-110 Factory Reset (see WARNING!!!) Turn the power on while holding the [ PART ] and [ EDIT ] buttons 64 Factory Preset Patches are automatically loaded by default via the on‑board ROM IC |
I Plugged In An SN‑U110 PCM Card. How Do I Access The Tones On The PCM Card? | See the section titled ![]() |
How Do I Adjust The Display Contrast Of The LCD Screen? | U-20 Press [ EDIT ] Press the [ ◅ ] LEFT CURSOR several times to select SETUP (blinks) then press [ ENTER ] Use the [ ◅ ] CURSOR [ ▻ ] to select LCD (blinks) then press [ ENTER ] Use [ △ ] VALUE [ ▽ ] or the C2/VALUE Slider Knob to adjust the LCD Contrast (0 - 15)* Press [ KEYBOARD ] + [ SOUND ] at the same time to resume normal play mode U-220 Press [ EDIT ] Press the [ ◅ ] LEFT CURSOR to select SETUP (blinks) then press [ ENTER ] Use the [ ◅ ] LEFT CURSOR [ ▻ ] to select LCD (blinks) then press [ ENTER ] Use [ △ ] VALUE [ ▽ ] to adjust the LCD Contrast (0 - 15)* Press [ EXIT ] three times to resume normal play mode U-110 Press [ EDIT ] Press the [ ◅ ] [ ▻ ] buttons to select UTIL (blinks) then press [ ENTER ] Press the [ ◅ ] [ ▻ ] buttons to select LCD (blinks) then press [ ENTER ] Adjust the contrast using the [ DEC ] [ INC ] buttons Press [ EXIT ] three times to return to the Play Mode * The contrast setting is saved the instant you change (just like all the other U-20 / U-220 settings) The new setting is retained even if the U-20 / U-220 is powered off |
Why Does My U‑20 Act Sluggish? | This could be caused by one or a combination of these three issues; 1) If the setting for SysEx Patch Dump is turned ON, this will cause the U-20 to spend unnecessary cycles sending SysEx data to the MIDI ports. Set this to SysEx Patch Dump = OFF* and you should notice improved response times when cycling through patches Press [ JUMP ] [ BANK 1 ] Press [ ▻ ] LEFT CURSOR two times Press [ ▽ ] VALUE DOWN to set SysEx Patch Dump = OFF Press [ KEYBOARD ] + [ SOUND ] at the same time to resume normal play mode 2) If you have more than three MIDI devices plugged into your chain of MIDI THRU connectors, use an optional MIDI THRU box 3) Earlier versions of the U-20 ROM IC experienced delays which occurred when
Too many Program Change or Control Change messages could be overloading the MIDI buffer If upgrading to a newer ROM IC is not an option, try setting Rx SysEx = OFF* Press [ JUMP ] [ BANK 1 ] Press [ ▻ ] LEFT CURSOR three times Press [ ▽ ] VALUE DOWN to set Rx SysEx = OFF Press [ KEYBOARD ] + [ SOUND ] at the same time to resume normal play mode * Remember to set SysEx Patch Dump = ON and Rx SysEx = ON when saving/loading Patch banks or using your synth and computer for sequencing |
Other Than A Keyboard, What Are Some Of The Main Differences Between The U‑20 And The U‑220 / U‑110 Sound Modules? |
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Synth Sample PCM Card Data RAM Assignable Built-In Internal Model Playback Rate Slots Card Slots Outputs DSP Effects ROM Size ----- ------------- -------- ---------- ---------- ------------------- -------- U-20 44kHz 2 1 2 Reverb/Chorus/Delay 3MB U-220 44kHz 2 None 4 Reverb/Chorus/Delay 3MB U-110 32kHz 4 None 6 Tremolo/Chorus 2MB ![]() |
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So... What's The Purpose Of The Micro Slide Switch Lsbeled FIXED/VARIABLE On The Back Of The U‑220? |
If the MIX OUT jacks are being used, setting this switch to FIXED will set the volume output at maximum level regardless of the position of the front panel Volume knob. Setting this switch to VARIABLE will allow you to regulate the volume using the VOLUME knob. The FIXED/VARIABLE switch has no effect on the sound that is being output from DIRECT OUT. You will not be able to regulate the volume using the VOLUME knob |
How Do I Repair Non‑Working Keys On A U‑20? | ![]() ![]() ![]() |
How Do I Test The U‑20 To Make Sure Everything Is Working? | [ Warning: Some Test Modes are *DESTRUCTIVE*. Backup the Internal Patches and RAM Card Patches before testing!! ] To enter Test Mode Press [ PART ] + [ RHYTHM ] simultaneously to enter ROM Play Mode While holding [ MARK ] and [ JUMP ], press [ ENTER ] for Test Mode * To exit Test Mode, while holding [ MARK ] and [ JUMP ], press [ EXIT ] Test #1 [ JUMP ] + [ BANK 1 ] LCD Contrast Test (Adjust level by using the Pitch Bender) Test #2 [ JUMP ] + [ BANK 2 ] LED Test (Adjust speed by using the Pitch Bender) Test #3 [ JUMP ] + [ BANK 3 ] Internal RAM Test (Also shows the internal battery voltage. Cool!) Test #4 [ JUMP ] + [ BANK 4 ] RAM Card Test (Also shows the RAM Card battery voltage. Cool x 2!) Test #5 [ JUMP ] + [ BANK 5 ] PCM Card Test (See Notes Below) Test #6 [ JUMP ] + [ BANK 6 ] Internal PCM ROM Test (Outputs letters A - F if OK) Test #7 [ JUMP ] + [ BANK 7 ] Key + Button + Pedal + PCM Card Insert Tests (DP-2 Pedal) Test #8 [ JUMP ] + [ BANK 8 ] A/D Converter Test + Visual Aftertouch Tests (See Notes Below) Test #9 [ JUMP ] + [ NUMBER 1 ] Control Sliders + External Input Tests (C1, C2, EV-5 Pedal) Test #10 [ JUMP ] + [ NUMBER 2 ] MIDI I/O test. Connect MIDI IN to MIDI OUT w/cable. Press [ ENTER ] Test #11 [ JUMP ] + [ NUMBER 3 ] Sound Test #1 (Requires Connecting An Oscilloscope - See Service Notes) Test #12 [ JUMP ] + [ NUMBER 4 ] Sound Test #2 (Requires connecting an oscilloscope - See Service Notes) Test #13 [ JUMP ] + [ NUMBER 5 ] DAC MSB Adjustment (Requires connecting an oscilloscope - See Service Notes) Test #14 [ JUMP ] + [ NUMBER 6 ] Effect Test. Press and hold any key for more than 0.5 seconds Test #15 [ JUMP ] + [ NUMBER 7 ] Memory Initialization (* * DESTRUCTIVE! * *) Test #16 [ JUMP ] + [ NUMBER 8 ] Factory Data Load from an M-256E or M-512E RAM Card (* * DESTRUCTIVE! * *) Notes: a) [ JUMP ] + [ BANK ] -or- [ JUMP ] + [ NUMBER # ] indicates pressing both buttons simultaneously b) "PCM Card Test" will only work with PCM Cards SN-U110-11 (in Slot #1) and SN-U110-01 (in Slot #2) c) "A/D Converter Test" displays Pitch Bender and Modulation levels when using the Pitch Bender d) See page 10 of the U-20 Service Notes for a detailed descriptions of all Test Modes e) "Visual Aftertouch Test" shows how lame your U-20's Aftertouch can really be. I was only able to get mine up to the 20 - 25 range... nowhere near 127... and I was really pressing hard. There is an easy and inexpensive modification at the SuperSynth U‑20 DIY Page allowing a more responsive Aftertouch |
How Do I Test The U‑220 To Make Sure Everything Is Working? | [ Warning: Some Test Modes are *DESTRUCTIVE*. Backup the Internal Patches and RAM Card Patches before testing!! ]
To enter Test Mode Press [ JUMP ] + [ VALUE△ ] simultaneously to enter ROM Play Mode While holding [ MARK ] and [ JUMP ], press [ ENTER ] for Test Mode * To exit Test Mode, while holding [ MARK ] and [ JUMP ], press [ EXIT ] Test #1 [ JUMP ] + [ EDIT ] LCD Contrast & LED Test (△ VALUE ▽ = Contrast Control) Test #2 [ JUMP ] + [ DATA ] SRAM Test (Also shows the internal battery voltage. Cool!) Test #3 [ JUMP ] + [ EXIT ] PCM Card Test (See Notes Below) Test #4 [ JUMP ] + [ ENTER ] Internal PCM ROM Test (Outputs letters A - F if OK) Test #5 [ JUMP ] + [ ◅ PART ] Switch Test (Press panel switches in any order) Test #6 [ JUMP ] + [ PART ▻ ] MIDI I/O test. Connect MIDI IN to MIDI OUT w/cable. Press [ ENTER ] Test #7 [ MARK ] + [ EDIT ] DAC MSB Adjustment (Requires connecting an oscilloscope - See Service Notes) Test #8 [ MARK ] + [ DATA ] Sound Test #1 (Requires Connecting An Oscilloscope - See Service Notes) Test #9 [ MARK ] + [ EXIT ] Sound Test #2 (Requires connecting an oscilloscope - See Service Notes) Test #10 [ MARK ] + [ ENTER ] Effect Test (Connect To Amp. Press and hold VALUE △ for more than 0.5 seconds) Test #11 [ MARK ] + [ ◅ PART ] Memory Initialization (Press VALUE △ * * DESTRUCTIVE! * *) Test #12 [ MARK ] + [ PART ▻ ] Factory Data Load (* * DESTRUCTIVE! * *) Notes: a) [ JUMP ] + [ *BUTTON* ] -or- [ MARK ] + [ *BUTTON* ] indicates pressing both buttons simultaneously b) "PCM Card Test" will only work with PCM Cards SN-U110-01 (in Upper Slot) or SN-U110-01 (Lower Slot) c) See Page 9 of the U-220 Service Notes for detailed descriptions of all Test Modes |
How Are U‑20 Settings Adjusted For The Arpeggiator? | Arpeggiator parameters which can be adjusted are Type: UP, DOWN, UP & DOWN or RANDOM Rate: 0 through 100 To set the Arpeggiator Type; Press [ EDIT ] then [ JUMP ] then [ ARPEGGIO ] Use [ ◅ ] CURSOR [ ▻ ] to select Type (blinks) Use [ △ ] VALUE [ ▽ ] to select UP, DOWN, UP & DOWN or RANDOM Press [ KEYBOARD ] + [ SOUND ] at the same time to resume normal play mode To set the Arpeggiator Rate; Press [ EDIT ] then [ JUMP ] then [ ARPEGGIO ] Use [ ◅ ] CURSOR [ ▻ ] to select Rate (blinks) Use [ △ ] VALUE [ ▽ ] to select 0 through 100 Press [ KEYBOARD ] + [ SOUND ] at the same time to resume normal play mode |
What is Active Sensing And How Do I Turn It OFF? | Active Sensing is a type of MIDI message which is used to implement a "safety feature". It can provide an automatic "MIDI Panic" control that will cause stuck notes and other undesirable effects to be resolved whenever the MIDI connection in‑between modules is broken or impeded in some way. Active Sensing will send a MIDI pulse over the wire every 300ms. Personally, I like to turn Active Sensing OFF because the MIDI Message LED's on the rest of my devices start going bat‑shit crazy like a strobe light. It's very distracting. I prefer to see MIDI Message LED's trigger only when I play something on the keyboard, send/receive SysEx data to/from a librarian or when a sequencer is in playback‑mode. It also unnecessarily fills up the MIDI buffer and makes troubleshooting more difficult. Sometimes, too many devices on a MIDI chain which have Active Sensing turned ON will cause MIDI buffer overflows and for a couple of seconds, MIDI notes will not reach the module being played U-20 By default, the U-20 has Active Sensing turned ON. To turn it OFF Press [ JUMP ] then [ BANK 2 ] then press [ ▻ ] RIGHT CURSOR five times to select Tx Active Sensing Press [ ▽ ] VALUE DOWN and set it to Off * This parameter can also be found within the EDIT menu: EDIT >> Setup >> MIDI >> Kybd >> TX Active Sensing U-220 By default, the U-220 has Active Sensing turned OFF. To turn it ON Press [ DATA ] then press [ ▻ ] RIGHT CURSOR three times to select Util and press [ ENTER ] Press [ ▻ ] RIGHT CURSOR one time to select MIDI Monitor and press [ ENTER ] Press [ △ ] VALUE UP or [ ▽ ] VALUE DOWN and set it to Run |
What Kind Of DSP Effects Are Built‑In To The U‑20 And U‑220? | Two basic effects are available: Chorus and Reverb/Delay. The effects routings through MIX OUT are as follows; Dry: Part is not affected by the sound patch effect setting Rev: Part is only affected by the reverb Cho: Part is affected by chorus and reverb Dir: Part is sent to the DIRECT OUT jacks Additionally, when programming the Chorus section, it can be assigned before or after the Reverb section. Chorus Effects Chorus 1: Standard chorus effect Chorus 2: Richer and more pronounced effect FB-Chorus: Chorus tending towards flanging Flanger: As it says Short Delay: A chorus with a noticeable delay (Parameters available for LEVEL, DELAY TIME, MOD RATE, MOD DEPTH, FEEDBACK) Reverb/Delay Effects Room 1: Standard room reverb Room 2: Slightly bigger room reverb Room 3: Warmer room reverb Hall 1: Standard hall reverb Hall 2: Warmer and bigger hall reverb Gate: Weak gate reverb Delay: Standard delay Cross Delay: Standard left/right delay (Parameters available for REVERB / DELAY TIME, LEVEL, DELAY FEEDBACK) |
How Do I Troubleshoot And Repair The Aftertouch On A U‑20? | Non-responsive and lackluster Aftertouch seems to be a complaint from several U‑20 owners. I have three U‑20's. One is really lame when it tries to do Aftertouch and the other two initially did not have any Aftertouch at all |
While running the Visual Aftertouch Test, I was only able to get mine up to the 20 - 25 range... nowhere near the maximum of 127... and I was really pressing hard... like the "I might break this key in half", kind of hard. I think the U‑20's Aftertouch problem can be remedied if the contact strips are cleaned. However, the Aftertouch membrane strips are glued in place and it looks like a delicate operation (see below). I've not attempted to remove this glue so the Aftertouch on my U‑20 #1 is still lame. My U‑20 #2 and #3 had no Aftertouch at all. That problem was twofold but I was able to fix it (kind of) 1) The ribbon connector was unplugged on my U‑20 #2, probably from the last owner monkeying around with the keyboard assembly 2) There was a broken solder joint on the Aftertouch ribbon cable connector board at CN2 on the Bender Board Daughter Board on my U‑20 #2 and U‑20 #3. This is also called the Jumper Board (U‑20 Service Manual P/N: 29‑2). It's a very tiny circuit board only 1cm wide (Figure 1) After repairing these issues, the Aftertouch is working again but... it's just as lame as the Aftertouch on my U‑20 #1. This same Jumper Board problem also crops up on the Alpha Juno‑2 because it uses a nearly identical miniature circuit board to connect its Aftertouch ribbon cable Aftertouch is initiated when a key is pressed down hard which forces two layered membranes together. Depending on how much contact is made between these two membranes will determine the Aftertouch level. I attempted to separate the two layers so I could get inside and wipe off any oxidation on the Aftertouch contacts (Figure 2). However, after about an inch into the removal, I soon realized they were attached together with an extremely strong glue. Why couldn't Roland have used their substandard Red Epoxy here instead? ![]() Aftertouch Modification There is a simple modification at the supersynthprojects.com website which can be performed without having to remove the keybed assembly. The modification adds a small multi‑turn potentiometer onto the Aftertouch circuit and is a "Set & Forget" fix. Highly recommended. Click here for detailed step by step instructions (Figure 3 & Figure 4) |
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How Do I Repair A Keyboard Suffering From The Dreaded "Red Epoxy Syndrome"? | The Problem The Red Epoxy Syndrome appears on several Roland keyboards manufactured in the late 1980's and early 1990's. A short list includes the JD‑800, JV‑80, JV‑1000, XP‑80 and U‑20* |
![]() The Solution (literally) Dissolve the red goop and then reattach the weights using a quality epoxy. Some people have reported good success at dissolving the red goop by using a sodium hydroxide solution (also known as NaOH, Lye or Caustic Soda). Others have reported success using Drain‑O drain cleaner. However, in a post over at gearsz.com from user XPARIS001, there is a method which costs less than the foul smelling, poisonous and flesh eating sodium hydroxide solution. It's a product called LA’s Totally Awesome All‑Purpose Cleaner (UPC#: 722429640222). It's non‑toxic and biodegradable. I used this on a full set of U‑20 white keys with good results. One of the best things is that there's no foul odor and this stuff is only $3 for a 1/2 gallon bottle. Not a mis‑print. $3 A Bottle! If you can't find the large bottle, they also sell smaller 16 oz. bottles (pour or spray) for only $1 (UPC#: 0722429320100). I found it at a Dollar Tree store right down the road from me. Bonus! From my experience with removing the red goop, I suggest you follow these tips
If you have a low patience level, don't go anywhere near this project. It's a total nightmare. Over my five day ordeal, I used every curse word I know and invented two new ones. On the third day I muttered something out loud like, "...where's the nearest Roland Authorized Service Center?" and also checked eBay for any new U‑20 auctions. If you decide to do this refurb, the method I would choose is LA’s Totally Awesome All‑Purpose Cleaner as opposed to the sodium hydroxide method. I was a little disappointed that the weights did not fall off on their own. It caused some extra work but my goal was accomplished. I think that if your red goop problem is in a liquidy state, the weights will drop off just fine. I think the glue on my keys was harder than most. If you can't find LA’s Totally Awesome All‑Purpose Cleaner where you live, another product with the same ingredients is called Orange Plus All Purpose Cleaner. Both of these products are Orange Oil based. You may be able to find a similar product in your area by matching the ingredients which are: Orange Oil Blend, Ethoxylated Alcohol, Disodium Salt, Tetra Sodium EDTA and Hydroxy Sodium. The Material Safety Data Sheet for the one I recommended is here * Keyboards with the red goop problem are EP‑9, JD‑800, JV‑50, JV‑80, JV‑90, JV‑1000, U‑20, XP‑80, XP‑90, D‑70 and VK‑1000. I'll bet the Roland Customer Service Department shit a brick when these keyboards started failing at the same time all over the world :^O Extra Info If you lost one or more of the steel keyboard weights, here are some specs so you can make your own: Dimensions Length: 34.6mm (1.36 inches) Width: 16mm (0.62 inches) Height: 2.2mm (0.08 inches) Weight: 0.6g (I had a few weights missing on my U‑20 so I used 3 U.S. pennies filed down on the sides which acted as a good substitute) |
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How Do I Fix Unresponsive Or Broken Switches On The Front Panel? | U‑20 Tact Switch Replacement Tact switch leads for the U‑20 are mounted extremely close on top of the Panel Assembly PCB and using diagonal flush wire cutters to remove them is not the best method. I recommend using an Exacto razor knife to remove these small tact switches from the PCB. Heat the solder trace on the backside of the PCB and use the Exacto razor knife to gently pry the tact switch up and out of the PCB via. Use a stainless steel hollow desoldering needle (or a solder sucker) to remove any excess solder from the PCB vias. I used a very low temperature setting because the 30+ year‑old Roland PCB's and traces are quite brittle and fall apart easily The total number of tact switches needed for the U‑20 is 38. Do yourself a favor and buy a couple of spares because... shit happens There are two types of tact switches to choose from. The original tact switches installed by Roland had a light touch Operating Force of only 1 Newton*. I prefer a harder press of 1.5 Newton ![]() 1) Brand Name: OMRON Manufacturer P/N: B3F-6022 Mouser P/N: 653-B3F-60223 Operating Force: *1.5 Newton Operating Life: 300,000 cycles Size: 5mm (H) x 6mm (W) x 6mm (D) 2) Brand Name: OMRON Manufacturer P/N: B3F-6020 Mouser P/N: 653-B3F-60203 Operating Force: 1.0 Newton Operating Life: 1,000,000 cycles Size: 5mm (H) x 6mm (W) x 6mm (D) Note: These switches will also work for the Roland JV‑80, JV‑90, JV‑880, JV‑1080, JV‑2080, U‑20 and XP-50 The original switches I previously recommended were manufactured by Panasonic but these have been discontinued You may still be able to find some fof these from other electronic supply houses online Manufacturer P/N: EVQ-22705R (This part was marked as obsolete at mouser.com in August 2019) Manufacturer P/N: EVQ-21405R (This part was marked as obsolete at mouser.com in August 2019) ![]() |
An Error Message On my U‑20 LCD Says "Key Scanner Error". How Do I Fix That Problem? | No clue :^( A visitor to this website had a U‑20 with this error. He took it to an Roland Authorized Service Center and they reported it was unrepairable |
Who Is Crazy Enough To Remove A Version 2.00 Main Circuit Board From A Working U‑20 And Replace It With A Version 3.03 Circuit Board? | That would be me. The crazy one. I found a good deal on eBay for a Main Circuit Board with a Version 3.03 ROM IC soldered in. Since my spare U‑20 was running with an old Version 2.00 ROM (also soldered in), I wanted to see if I could swap them. Both boards were identical with the exception of ROM IC#8 and both boards had the same part numbers (U‑20 ASSY | 76213900 | 292‑735‑01). I had great results but there were a few minor roadblocks along the way. If you decide to do this upgrade, be aware of these issues |
Some of the cable hookups use Wire Trap Connectors (Figure 1). I never worked with these before. I was unable to figure out how they worked until I posted a question online. Someone in the Synthesizer Spares or Repair Facebook group showed me how they work. After you know the secret, it's easy. Your first inclination is to pry up the top of the connector and pull the ribbon wire out. Don't! The ribbon wire is locked in place (Figure 2). You need to use your fingers or a small flat‑blade screwdriver and push down on the side of the connector (Figure 3). This "unlocks" the ribbon wire from the connector making it easy to pull up and out Remove the 3V battery before you swap the boards. Install the battery after all of the board cables are plugged in There are plenty of ways to disable a U‑20. This could be one of them. This is a very risky and time consuming project. Especially risky are the wire trap connectors and cables. These cables are flimsy and after a few connects and disconnects, the wires start to bend and fray. They seem best suited for a one‑time use when they were first assembled at the factory. After a few weeks of use, I haven't noticed any compatibility issues between the v3.03 Main PCB and the other PCB's which were not changed out and previously connected to the v2.00 Main PCB (i.e. Switch Board Left, Switch Board Right, Bender Board, etc...). I'm not posting any instructions here because if you attempt this, you are obviously mechanically inclined enough to figure things out on your own. I'm posting this just to let others know it can be done if needed ![]() | |
Where Can I Get U‑20, U‑220 and U‑110 Questions Answered? | There is a private Facebook group for U‑20, U‑220 and U‑110 owners and is free to join
![]() ![]() There is also popular online forum for getting a lot of synthesizer related questions answered is at gearsz.com; ![]() |
* * * ROM IC VERSIONS * * * | ||||||||||||||||||||||
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28-Pin MASK ROM v2.00 For The U-20
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28-Pin MASK ROM v3.03 For The U-20
[ Warning: Checking the ROM IC version does a 'Soft Reset'. Backup your internal Patches!!!!! ] U-20 In PLAY MODE section, press [ PART ] and [ RHYTHM ] simultaneously, to enter ROM PLAY While holding [ MARK ] and [ JUMP ], press [ ENTER ] * To exit, while holding [ MARK ] and [ JUMP ], press [ EXIT ] U-220 Press [ DATA ] then use the [ ◅ ] [ ▻ ] buttons to select UTIL, press [ ENTER ] Use the [ ◅ ] [ ▻ ] buttons to select ROM PLAY, press [ ENTER ] While holding [ MARK ] and [ JUMP ], press [ ENTER ] * To exit, while holding [ MARK ] and [ JUMP ], press [ EXIT ] U-110 Turn the power on while holding the [ DEC ] and [ INC ] buttons * To exit, press [ DEC ] + [ INC ] simultaneously to cycle through the remaining test screens I was very surprised to find that both my U‑20 ROM and U‑110 ROM IC's were soldered directly onto the PCB and not socketed. Yipes!!! This change by Roland was made to cut production costs which was a horrible decision for techno geeks like myself who like to make backups of synth firmware and help other synth owners upgrade to the latest and greatest version. I've discovered that the ROM's installed on most U‑20's and U‑110's are not EPROM's but are instead MASK ROM's. It's nearly impossible to copy this MASK ROM binary code and burn it onto a regular EPROM unless you make your own custom rewired socketed adapter for your EPROM reader/burner The Good News If your U‑20 has a MASK ROM, the electron data will not deteriorate over time like that of a regular EPROM The Bad News If your U‑20 firmware is v1.x or v2.x, upgrading your firmware is nearly impossible. It would require unsoldering the old IC, figuring out a way to read a v3.x MASK ROM and burning it ![]() ![]() ![]() |
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U-20![]() IC8 on the PCB |
VER. 1.03 [ 89/05/16 ]
VER. 2.00(a) [ 89/06/16 ]
VER. 2.00(b) [ 89/08/04 ]
VER. 3.01 [ 89/xx/xx ]
VER. 3.03(a) [ 89/10/30 ]
VER. 3.03(b)* [ 89/12/22 ]
* Final ROM IC Version![]() - ROM IC Version - Visual ID - (SILKSCREEN PRINTING) - - - - VER. 2.00(a) - - - - ROLAND U-20 R15179950 LH53101B V2.00 8931D - - - - VER. 3.03(a) - - - - ROLAND R15209239 LH53104S 9044D The U‑20 v3.03 firmware is available here |
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U-220![]() IC8 on the PCB |
VER. 1.00 [ 88/xx/xx ]
VER. 1.01 [ 89/12/25 ]
VER. 1.02* [ 90/02/16 ]
* Final ROM IC VersionBurn your own U‑220 ROM here |
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U-110![]() IC#9 on the PCB |
VER. 1.00 [ 88/xx/xx ]
VER. 2.00 [ 89/xx/xx ]
VER. 2.03* [ 89/xx/xx ]
* Final ROM IC Version
- ROM IC Version - Visual ID - (SILKSCREEN PRINTING) - - - - VER. 2.03 - - - - ROLAND R15179960 LH531467 8911E The U‑110 v2.03 firmware is available here |
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* * * SPECS * * * | |||||
MODEL | WIDTH | DEPTH | HEIGHT | WEIGHT | |
U‑20 | 38 3/4" (985 mm) | 12 1/16" (310 mm) | 3 1/4" (85 mm) | 22 lb. (10 kg) | |
U‑220 | 19" (482 mm) | 14 1/8" (358 mm) | 1 3/4" (45 mm) | 9 lb. 11 oz. (4.4 kg) | |
U‑110 | 19" (482 mm) | 14 1/8" (358 mm) | 1 3/4" (45 mm) | 9 lb. 15 oz. (4.5 kg) | |
MODEL | POWER | VOICES | EXTRAS | ||
U‑20 | 20W | 30 | Arpeggiator / Control Change Sliders (C1 + C2) / RAM Data Card Slot | ||
U‑220 | 20W | 30 | 4 Audio Outs | ||
U‑110 | 21W | 31 | 6 Audio Outs / 4 PCM Card Slots / Tremolo+Chorus DSP | ||
MODEL | YEAR | PRICE (USD) | ROM | RAM | |
U‑20 | 1989 | $1,695 USD | 128 PCM Waveforms | 64 Patches / 128 Timbres / 8 Chord Sets / 4 Rhythm Sets | |
U‑220 | 1989 | $1,095 USD | 128 PCM Waveforms | 64 Patches / 128 Timbres / 4 Rhythm Sets | |
U‑110 | 1988 | $1,095 USD | 128 PCM Waveforms | 64 Patches / 99 Timbres / 1 Rhythm Set | |
INTERNAL BATTERY** | |||||
P/N: CR2032
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Replacement Power Switch [ U-20 Only ] | |||||
The U‑20 power switch is the same part number used on several synths and other Roland gear including the Alpha Juno‑1/2, Super JX‑10, JX‑8P, Juno 60/106, JV‑80, JD‑800, D‑10/20/50/70, MK‑80, and MPU‑101![]() |
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Replacement Power Switch [ U‑220 & U‑110 Only ] | |||||
Power Rating: 5A @ 250V AC Type: ON/OFF w/Four Solder Lugs |
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P/N: | ALPS: SDGA3P Sony/JVC/Panasonic: 554-880-12 Roland: 13129124 | ||||
If your old switch is experiencing problems, don't bother trying to repair it. Some of the parts inside are sealed in plastic and other parts are wired in place. Repairing it is a lost cause. This power switch works with the U‑220 and a wide selection of other Roland synths and samplers including the D‑110, D‑550, GM‑70, JV‑880, MKS‑20, MKS‑50, MKS‑70, MKS‑80, MKS‑100, S‑220 and S‑550. In the 1980's and 1990's, this power switch was also used with a variety of Sony/JVC/Panasonic TV's and component stereo devices. This power switch is quite robust and more expensive than most. Replacements can be found on eBay for about $10 (USD). Do a keyword search for "ALPS SDGA3P" |
* * * ACCESSORIES * * * | |
SN-U110 PCM Expansion Cards![]() Additional slots labeled "PCM CARD" on the U-20/220/110, D-70 and Rhodes Model 660/760 are for use with SN-U110 PCM Expansion Cards. There are a total of 15 PCM Cards available from Roland which are used to expand the sound capabilities by adding hardcoded waveform samples into the synthesizer. It is important to note that two of those cards "SN‑U110‑08 Synthesizer" and "SN‑U110‑09 Guitar & Keyboards" are already hard‑coded on ROM IC's inside the U‑20, U‑220 and D‑70 so don't waste your money buying those unless it's for a U‑110. Also, be aware that "SN‑U110‑10 Rock Drums" is not compatible with the D‑70. These PCM Expansion Cards are highly reliable because they are enclosed in a metal case, are shock & vibration resistant, have no moving parts inside and are able to withstand extreme temperatures from -40°F to 185°F I have listened to all of the Roland PCM Expansion Cards and the top three cards which impressed me the most are (in order) 1. SN‑U110‑12 - Sax & Trombone (I'm totally bonkers about this card. Some of the most realistic saxophone samples I've ever heard) 2. (Tie) SN‑U110‑03 - Ethnic & SN‑U110‑02 - Latin And F.X. Percussions (An excellent selection of Sitars, Tablas, Balafons, Zings, Zaps, Boings, Vibraslaps and many more) 3. SN‑U110‑07 - Electric Guitar (Wayne's World! Wayne's World! Party Time! Excellent!) A great reference site for SN‑U110 PCM Cards is available at BigRedRoo To access the sounds of a PCM Sound Library Card plugged into a U-20; Press [ JUMP ] [ NUMBER 2 ] and the LCD Display shows Edit/Timbre[1]/Tone Tone = (x)-(yyy) (zzzzzzzzzz) x = PCM Card Number. For example, "SN-U110-11 Sound Effects" is PCM Card #11 yyy = Tone Number on the PCM Card. For example, 004 zzzzzzzzzz = Tone Name on the PCM Card. For example, WATERPHONE Use the ▻ cursor to select x and it will start blinking Edit/Timbre[1]/Tone Tone = 11-004 WATERPHONE 11 = The PCM Card Number (SN-U110-11 Sound Effects) 004 = The Tone Number on the PCM Card WATERPHONE = The name of the Tone on the PCM CardIf the LCD display looks something similar to what is shown below and says "No Card!", you will need to change (x) to match up with the PCM Card number(s) Edit/Timbre[1]/Tone Tone = (x)-(yyy) No Card! ![]() Bingo! You just saved $225 ![]() |
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Roland Brand RAM Cards The slot labeled "RAM CARD" on the back of the U‑20 is for use with Roland Memory Cards M‑256(D/E/G) and M‑512(D/E/G). These RAM Cards allow storage for an additional 64 Patches and 128 Tones. Both cards will work exactly the same. However, using an M‑512 RAM Card is overkill because the extra memory on the card is not accessed. The U‑20 was originally designed to work with the M‑256 RAM Card... before the larger M‑512 RAM Card was manufactured. RAM Memory Cards will not work with the U‑220 or U‑110. For unknown reasons, Roland decided to disable RAM Memory Card access for these two synths even though there was plenty of room to add a RAM Memory Card slot on the front panel When inserting a RAM Card into the U‑20 for the first time ‑or‑ if the card contains data from a different model synthesizer, a message will appear on the LCD Display; It's a New RAM Card. Initialize it? [ENTER]After initializing the RAM Card, "Function Complete." will appear on the LCD Display. All of the U‑20's internal Patches and Tones are automatically copied onto the RAM Card immediately after initialization To access Patches on the RAM Card, press [ CARD/B ] [ BANK 1-8 ] [ NUMBER 1-8 ] To save all internal Patches to the RAM Card Press [ JUMP ] [ EXIT ] Use [ ◅ ] CURSOR [ ▻ ] then [ △ ] VALUE [ ▽ ] to select "All" Use [ ◅ ] CURSOR [ ▻ ] then [ △ ] VALUE [ ▽ ] to select "Int →Card" Press [ ENTER ] Press [ △ ] VALUE to confirm Alternatively you could Select "Int← Card" to load all the RAM Card Patches into the U‑20's internal memory Select "Int←→Card" to exchange all the RAM Card Patches will all the Patches in the U‑20's internal memory TROUBLESHOOTING ![]() When inserting or removing cards from the "RAM CARD" slot, always make sure the switch on top of the card is set to the PROTECT position to prevent accidental erasure of any data. These cards use an internal lithium coin cell battery which the owner's manual says to replace every 2 years. However, I have found my battery lasting anywhere from 5 to 7 years. The replacement battery is P/N: CR2016 ![]() ![]() ![]() ![]() |
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Custom Multi‑Bank RAM Cards This amazing custom multi‑bank RAM card is made in Germany. It's the equivalent of having 16 Roland M‑256 RAM cards on one device. It has switches on top so you can easily choose between the 16 different banks. There's no battery and everything is stored on an MRAM chip. The cool thing is that this card works on my U‑20 and also works on other synths I own like the JV‑880, D‑110, and GR‑1. It has a lengthy compatibility list including the Roland A‑90, D‑5, D‑50, D‑550, D‑10, D‑110, D‑70, JD‑800, JD‑990, JV‑1000, JV‑1080, JV‑2080, GR‑50, PM‑16, TR‑626, R‑880 (GC‑8), R‑8M, Akai MX‑1000, VX600 and others. The ability to move this card between different synths is convenient and a real money saver Sadly, this will not work with the U‑220 or U‑110 because Roland did not add a RAM card slot to these modules when they designed it... only slots for PCM ROM cards There are two RAM card models to choose from: M‑256 or M‑512. Both RAM card models will work exactly the same. However, using the M‑512 Card is overkill because the extra memory on the card is not accessed by the U‑20 (and most other Roland synths). Your best bang for the buck it to get the M‑256 RAM card model which will give you the equivalent of 16 Roland M‑256 RAM cards, not 8 Roland M‑512 RAM cards. I was on a wait list for more than a year but it looks like production has ramped up again. I received mine at the beginning of 2021 For the DIY crowd, there are some interesting modifications discussed in the User Manual to emulate PCM ROM cards or increase the bank sizes anywhere from 16 x 256Kbit, 8 x 512Kbit, 4 x 1Mbit, 2 x 2Mbit or 1 x 4Mbit simply by adding some solder bridges. More specs and ordering info is available at the Saga Musix website ![]() Update - January 2022: Fantastic News! The designer of this multi-bank RAM card has released the BOM and schematics into the DIY community for free. KiCAD PCB and Gerber files are available at github -or- you can oder PCB's from OSH Park and build your own now for half the price of a brand new card ![]() |
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EV-5 / EV-7 EXPRESSION PEDAL ![]() Notes:
❖ Also works great with the Roland W‑30, Alpha Juno‑1/2, HS‑10, JX‑10, S‑50 and the Synthrotek MST Expressor Eurorack module ❖There is an optional add-on polarity switch mod which enables EV‑5 compatibility with non‑Roland gear. Details for adding this optional switch into the circuit are here ❖The image shown on the right is a dual EV‑5 hand controller. This variation on the original design uses one 1/4" stereo output jack and one 3.5mm stereo output jack (hidden from view). Using output jacks instead of hard‑wiring the output cables was preferred since I already had several existing ready‑made cables. The knobs on top are the Main Controllers (VR1) |
EV-5 DIY Parts List (Hand Controller Version) Tayda P/N: A-1982 - 10K Ohm Linear Pot Tayda P/N: A-1983 - 50K Ohm Linear Pot Tayda P/N: A-5081 - 1/4' Stereo Plug Tayda P/N: A-5166 - 1590A Enclosure 2-Conductor Shielded Cable (Shield = Ground) taydaelectronics.com ![]() Variation: DIY Dual hand controller with optional output jacks |
Adjusting the EV-5 Minimum Volume Knob |
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DP-6 PEDAL [ Momentary Switch For Hold Control / Patch Change ] DP-8 / DP-10 PEDAL [ Momentary Switch For Hold Control / Patch Change + On/Off Switch ] The DP-6 and DP-8 have been discontinued but the DP‑10 will function in the same manner as the DP‑6 and DP‑8. Just set the Function Select switch (located on the side of the DP‑8 / DP‑10) to the "Switch" position. The DP-10 is equipped with a rubber plate on the bottom surface of the pedal. The DP‑8 does not have a rubber plate. This plate improves the stability of the pedal in use, making it less likely to slip even when used on a hard floor. The DP‑10 has a long 2.2 meter pedal cable. The DP‑8's cable length is 1.3 meters. Other than the points described above, the DP‑10 is identical to the DP‑8 in size and function. Both pedals are equipped with a Function Select switch to adjust the pedal's functionality: Half-Damper Control: Set the select switch to the Continuous position to use the pedal to control the half‑damper capability of your keyboard Switch Control: Set the select switch to the Switch position to use the pedal as an on/off switch |
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DP-2 PEDAL [ Momentary Switch For Hold Control / Patch Change ] Same function as the DP‑6 pedal but the DP‑2 model costs less and is made mostly of plastic parts |
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FS-1 [ Patch Change - On/Off Switch] This is an ON/OFF switch and is made mostly of metal parts |
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Pedal Model Description Product Status ----------- ------------------ -------------- FS-1 On/Off Discontinued DP-2 Momentary Current DP-6 Momentary Discontinued DP-8 Momentary + On/Off Discontinued DP-10 Momentary + On/Off Current EV-5 Variable Resistor Current EV-7 Variable Resistor Current EV-10 Variable Resistor Discontinued |
* * * ERROR MESSAGES * * * | |
ERROR MESSAGE | RESOLUTION |
Internal Battery Low!! |
The internal battery has died ![]() |
Checking PCM Card . . . | When you insert or remove a PCM card, this message will appear and operation will briefly halt. (This is normal) |
It's a New RAM Card.
Initialize it? [ ENTER ] |
The RAM card inserted into the RAM card slot has not been initialized for use by the U-20 Action 1: If the RAM card is new or if you want to use a RAM card from another device for the U‑20, press [ ENTER ] The RAM card will be initialized, and internal memory data will be written into it. Use only M‑256 or M‑512 RAM cards Action 2: If you have mistakenly inserted the wrong card, remove it immediately See the Troubleshooting Section if you are experiencing problems during format ![]() |
Data/*****
RAM Card Protected |
The protect switch of the RAM card is On, and writing is not possible. Turn the protect switch of the RAM card OFF, and try the operation again |
Data/*****
Card Not Ready Data/***** RAM Card Verify Error! |
When writing, saving or loading, the data was not correctly written into the RAM card. Make sure that the RAM card is correctly inserted, and try the operation again |
RAM Card Battery Low! | The battery of the RAM card has run down. Replace the battery according to the instructions in the RAM card manual |
Illegal PCM Card!
Please, take it out. |
The card inserted into the PCM card slot is not a PCM card. Immediately remove the card from the PCM card slot |
Receiving Exclusive. | Exclusive data is being received. Wait until reception ends (If the exclusive data being received is very short, this message will not appear) |
Transmitting Exclusive. | Exclusive data is being transmitted. When transmission ends, the display will show "Function Complete", and then return to the previous display (If the exclusive data being transmitted is very short, this message will not appear) |
SysEx Check Sum Error!
SysEx Data Length Error! |
System exclusive data was incorrectly received. Check MIDI cables and the message that was transmitted, and try the operation again |
Data/*****
Sure? [ VALUE Δ ] / [ EXIT ] |
This message will always be displayed when you write data into internal memory or a RAM card. If you are sure you want to write the data into memory, press [ VALUE Δ ] To quit without writing data into memory, press [ EXIT ] |
Data/*****
Function Complete. |
The write, save, or load operation has been completed. Wait for a short time until the previous display appears |
MIDI Buffer Full ! | If this error is shown while using a SysEx load/save program, the MIDI send and receive settings on the computer are too fast for the U‑20 MIDI buffer. Try setting the MIDI buffer size in your SysEx program to a smaller value If this error is shown while communicating with another MIDI device such as an external keyboard or sequencer, too many Program Change or Control Change messages are being sent to the U‑20 and overloading the MIDI buffer Try setting Rx SysEx = OFF Press [ JUMP ] [ BANK 1 ] Press [ ▻ ] CURSOR three times Press [ ▽ ] VALUE to select Rx SysEx = OFF Press [ KEYBOARD ] + [ SOUND ] at the same time to resume normal play mode |
Goofing Around With The LED's I removed all of the boring red LED's and replaced them with Blue/Green/Red/Orange/UV/Yellow. Other than the hassles of opening the case and juggling four circuit boards around, this DIY is quite easy and it makes the U‑20 look much better and is more intuitive with color coded buttons. Feel free to use your own LED color scheme. Complete DIY instructions are here |
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All Of The Boring LED's Have Been Replaced |
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Favorite DIY Tools And DIY Vendors
Tips For DIY Freaks Who Like To Save $$$. I picked this selection of gadgets and vendors because of the extremely LOW cost. I use everything shown here almost every day and highly recommend each one ![]()
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