Hello everyone. First of all, english is not my native language so please forgive my mistakes or weird choice of words. I have read seb968 wonderful post on restoring his M70, which I found because I seemed to have some similar issues. This is my parent's boombox, which I have dissasembled a few times to fix different simple issues. I come to you experts now in hope you can put me on the right track in finding the fix for my current issue. I'll try to be as detailed as possible so forgive me in advance for what might be a long post. How it started: Latest repair I did was cassette player not working properly: tapes would slip, and it would randomly autostop after a few seconds. Slipping was due to bad rubbers, which I changed and that was fixed. Random stopping I suspected a faulty blank detection chip (BA335, wihch is IC602). I disconnected the solenoid while sourcing a replacement. Tape player worked fine meanwhile. Once I got a replacement BA335 I took out the old one and soldered the new one in, and reconnected the autostop solenoid. Everything worked fine. Current situation: A few weeks later, the device has very low volume even when sliders are at full max. Sliders don't seem to be faulty, as volume is consistent, and wiggling the sliders doesn't produce any change. Sliding them down does still lower the volume even further. This is the same for both radio and tape mode. Both channels give same volume, both work, and level indicator needles and consistent with volume level. When switching the power on it gives a louder bump (it always has), but wiggling the power switch after that doesn't produce any changes or faulty contact. Following seb968's steps I assumed it was the MMS system, but disconnecting it's multiconnector doesn't change anything. Same for disconnecting the tape recorder module: volume is consistently low. I assumed it still had something to do with the IC602, since it's the only thing I replaced, and it's job is exactly to mute the system while in programming mode, so I changed the chip once again (I had the precaution of buying 3). No changes, still low volume in exactly the same way. If I turn the MMS on, the first LED lights normally. If I then push the "program" button, the volume goes even lower as long as I keep pressing it, and goes back the "normal" (i.e., low, but not extra low) when I release it, which maked me think the muting function is working properly (but the whole volume levels are offset down). MMS system does behave weirdly, but since it has never been used I can't really tell if this is a new issue or not: if I push program, second led flashes quickly, but that's it. I cannot get any other (numbered) LEDs to stay on besides the first (that indicated programming mode). In other words, programming is not working. Still, disconnecting the whole MMS module doesn't change the volume issue, so I believe these to be 2 separate issues. Can you give me any advice on what to try or test? Any suggestion would be deeply appreciated. Also let me know if I forgot to mention something vital.
go on boomboxery.....there are some skilled members on there that might be able to help you, good luck
im trying to help on both forums....can you show me seb968 repair posts...i need to read them, thanks in the meantime check all music search led's are working with a mustimeter, i think it has something to do with a blown led .i know this is really strange but sebs fault was something like this
