AppleCD 150 Caddy Eject Problem
- PCB Capacitor Replacements -

ROLAND CDROM

Some AppleCD 150 CD‑ROM's stop working because they continuously eject the caddy. Over time, defective capacitors on the PCB will start to leak. This is a very common problem with Sony CDU‑541 mechanisms. The same problem occurs on other mechanisms including the Sony CDU‑535 and Sony RRD42‑AA

A replacement guide at AsteronTech uses ceramic capacitors in place of electrolytic capacitors to reduce the chance of capacitors leaking in the future. I'm traditional and prefer to use components exactly as shown in schematics. Below are the capacitors you need to replace on the PCB of a Sony CDU‑541‑25 mechanism. If you have a Sony mechanism different from the CDU‑541‑25, verify the correct replacement capacitors before ordering
ROLAND CDROM


     

ROLAND CDROM
MOUSER P/N
ROLAND CDROM
QUAN
ROLAND CDROM
DIAMETER
ROLAND CDROM
HEIGHT
ROLAND CDROM
     Sony CDU‑541‑25 Capacitor Replacements
             100μF Electrolytic Capacitor ‑ SMD 6.3V
                PCB Locations: C427-C428-C429-C430
647-UWX0J101MCL1 4 6.3mm ≤ 5.4mm
             47μF Electrolytic Capacitorr ‑ SMD 16V
                PCB Locations: C211-C212-C215
647-UWJ1C470MCL1 3 6.3mm ≤ 5.4mm
             10μF Electrolytic Capacitorr ‑ SMD 16V
                PCB Locations: C213-C214
647-UWX1C100MCL1 2 4mm ≤ 5.4mm

Notes: The SMD capacitors on my PCB were nearly impossible to remove even when using a heat level higher than what I normally use. It might be the solder they used at the factory. Dunno?!? The electrolytic fluid that leaked on the PCB corroded the top layer of green paint in some areas but did not damage any copper traces. The plastic housing underneath the capacitor holding it in place dissentigrated simply by touching it. Strong stuff

Removing and Soldering SMD components is a real art. That makes me a starving artist. I'm lousy at it. I think if I had the right tools like a higher power magnifying glass and a smaller soldering iron tip it would be easier. Somehow, I managed to get all the components soldered in place and the caddy eject problem was solved


               Most of this information was gathered from these useful webpages;
                              AsteronTech
                              Retrotechnology Research Lab

                ROLAND CDROM
Safety Precautions and Disclaimer
Modifications made to any factory stock equipment will always pose an element of risk. Sometimes mistakes are made which are irreversible. Improper soldering and handling of electricity can cause serious injury and damage the synthesizer. Use caution when handling static sensitive devices and the PCB. Make sure you are properly grounded, working on a static-free workbench or table and wearing eye protection during any soldering tasks. The author is not responsible for any damage or injury resulting from this DIY info. Use this DIY information at your own risk. And, I can't stress enough, the importance of wearing eye protection while soldering. That stuff flies everywhere sometimes!

S-50_S-550_ZONE

info@super-jx.com
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