Inversing the preamp chip on RX-5350

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TW5

TW5

Member (SA)
Doesn't look like a good idea at the moment
also need more info
Where is that part from ?
 
mmcodomino

mmcodomino

Member (SA)
toshik said:
What are the symptoms? I've fixed them before.
Click to expand...
Everything is working except for the left VU meter and the left channel when it is playing a tape.
Radio is strong on both channels and in stereo, so is line in. Just the left VU meter does not move to the music.
 
mmcodomino

mmcodomino

Member (SA)
toshik said:
This is very typical issue. Does not need two of you to fix :-)
Click to expand...
We already took the record bar apart and cleaned it. Same with the stereo/ambience switch.
Same symptoms. :(
What could be the cause of the problem?
 
BoomboxLover48

BoomboxLover48

Boomus Fidelis
It is very common for the corner of the board on the left side to crack and and kill the left VU meter function. I had that issue with one of my 5350.

The second picture shows the crack. I used signal tracer and found the problem.

But no sound from the left channel and left VU meter not functioning could be related to signal loss due to another problem.
 

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baddboybill

baddboybill

Boomus Fidelis
I would say check tape head and wiring for issues with left channel on deck🤔. Or function switch


Bad Boy Bill
 
mmcodomino

mmcodomino

Member (SA)
Thanks for your help so far. The board is not cracked anywhere. We just cleaned the function switch as well and are in the process of changing the belts right now which we might as well do while we are at it.
I'll let you know what it does once it is back together. :)
 
mmcodomino

mmcodomino

Member (SA)
No results. Same issues as before. :(

I got you message, toshik. Thanks! Where are you located? i don't feel like sending the board around would be a good idea though.
 
bredgeo

bredgeo

Member (SA)
Hey all,

Thanks for the info and stuff!!!!

Toshik, I would love to sent the board... but you being in the US and the posties in Europe and America not always being nice, I don't wanna chance it!!!! :blush:

I think the chip we had a look at and changed might not be the preamp... I got the schematics, met up with a guy here that siad he will be able to look at her... I am gonna try that.

Later!
 
zzmbie

zzmbie

New Member
Hey to all,

i`m new here, but not in Boomboxes.

I have the same problem with the right channel, also only when tape is playing and only when the switch is on stereo. On ambience and mono both speakers working. :bang:
 
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