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RegistrerenTuner Akai AT-A102 (Algemeen)
door edison 
, Aveiro - Portugal, 30-04-2025, 20:36 (292 dagen geleden)
Hallo.
Does anyone have the service manual for the Akai AT-A102 tuner?
I need it to try to repair my tuner.
Many thanks,
Carlos
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From PORTUGAL, with regards
Carlos
Tuner Akai AT-A102
door Ben 
, Dijkdorp, 30-04-2025, 21:31 (292 dagen geleden) @ edison
Yes I have, send me a pm and you get it.
Greetings, Ben
Tuner Akai AT-A102
door edison , Aveiro - Portugal, 30-04-2025, 22:30 (292 dagen geleden) @ Ben
Yes I have, send me a pm and you get it.
Greetings, Ben
Many thanks Ben.
PM sent.
Best regards,
Carlos
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From PORTUGAL, with regards
Carlos
Tuner Akai AT-A102
door edison , Aveiro - Portugal, 16-02-2026, 17:16 (12 uur en 16 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
Tuner Akai AT-A102
door Goldline , Oranjedorp, 16-02-2026, 19:36 (9 uur en 56 minuten geleden) @ edison
Gewijzigd door Goldline, 16-02-2026, 19:37
Yo Carlos, check your mute circuut, see the output schematic :
(Test by remove the diode)
![[image]](images/uploaded/20260216183623699363a71f5f0.jpg)
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Cees PA1DBA
Tuner Akai AT-A102
door edison , Aveiro - Portugal, 16-02-2026, 23:59 (5 uur en 33 minuten geleden) @ Goldline
Yo Carlos, check your mute circuut, see the output schematic :
(Test by remove the diode)
Hi Cees.
Thanks for the reply, but the problem wasn't in the mute circuit.
Let me explain:
After disconnecting the diode, I tested the tuner on the workbench, and it was working. I reconnected the diode, and it was working fine.
I put the tuner back in the music center, and it started malfunctioning again. (The problem was there.)
I checked everything and discovered that the antenna cable was broken near the connector.
This problem must have happened when I moved the music center during cleaning...
Best regards,
Carlos
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From PORTUGAL, with regards
Carlos