Tuner Akai AT-A102 (Algemeen)

door edison , Aveiro - Portugal, 16-02-2026, 17:16 (6 uur en 6 minuten geleden) @ edison

Hello everyone.

I repaired my tuner which had a broken zener diode in the power supply.

It worked very well until now, but another problem has appeared:

The output level is very low, and it's almost inaudible.

I tested the amplifier and it's okay.

I checked the power supply and it's fine.

My suspicion falls on the output integrated circuit, UPC 1235C, but I would like to have some more certainty and for that I would like to know what voltages are present at its terminals.

In the diagram I have, I can't see these voltages clearly.

My question is:
Does anyone have the original schematic, where these values ​​are perfectly visible?

Can you tell me what the voltages are at each pin?

Thank you.
Carlos

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From PORTUGAL, with regards
Carlos