JVC PC37 one channel OFF in stereo mode

[bendera]

Hi,
I can't find a service manual for JVC PC37. The problem is exist only in stereo mode, when i switch to Mono, sound comes to both speakers. Same for Tape and Radio source. Just ordered a contact cleaner, but not sure it will help. Any ideas where to look for a cause? Thanks!

 

[dubout]

Contact cleaner might already be the solution. But be careful, some contact cleaners contain aggressive chemicals that help at first but degenerate the insides of the switches after a while and destroy them! I mainly use Kontakt Chemie WL which is only for cleaning. That mostly does the trick. Then there is Kontakt Chemie 61 of which I don't know if it is bad for contacts?! I only use it when I dont care too much about the boombox but had no troubles so far. The most aggressive is Kontakt Chemie 60 which I wouldn't recommend unless it is washed out afterwards – with Kontakt Chemie WL for example.

 

[bendera]

The problem is not easy to resolve. I received a contact cleaner and all switches were sprayed. Now Radio works in both Mono/Stereo modes, but Tape is not fixed. Only Mono and only in Reverse mode, direct play is producing a very weak signal.