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This is exactly the service manual I needed.
Complete with all schematics, partslists, PCB layouts and alignment instructions.
This manual covers both the T-4970 en T-488F Onkyo tuner.
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IF PRINTED CIRQUIT BOARD WIRING VIEW WAS ONE TONE LIGHTER, THEN 5 STAR RANK HAS TO BE MY CHOISE.
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Very usefull, good quality drawings !
Muito útil encontrei todas as informações necessárias.
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Wanting to repair a neighbours tape recorder I needed the necessary information, it makes it easier. Although the service manual is described as "Language : English" To my dismay I found that it is entirely written in German, a language I do not understand. At least I now have the schematics which will help of sorts. I may not use this service again due to the laguage difficulty after all when it states English you do not expect it to be entirely in another language.
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GOOD SERVICE MANUAL.I ALWAYS BUY THERE IF I FIND WHAT I AM LOKING
5 Troubleshooting
5-1-13 High Voltage Failure
No Check and replace IC401 and +12 V line.
WAVEFORMS
3 5.00 V (IC401, #28)
3
IC401 Pin 28 OSC pulse exists?
Yes No
10
Q402 Gate driving pulse exists? Yes No
Check and replace Q401.
CH1 P-P = 2.00 V CH1 RMS = 5.868 V
10 5.00 V (Q402, Gate)
11
Q402 Drain pulse exists?
Check and replace Q403 and L402.
Yes Done
CH1 P-P = 2.00 V
CH1 RMS = 7.692V
11 50.0 V (Q402, Drain)
5-1-14 ABL Failure
CH1 P-P = 50.0 V CH1 RMS = 73.7V
Input full white pattern to monitor.
IC101 Pin 22 input exists and varies with different patterns? Yes Check CN102. Yes T501 Pin 8 output exists?
No
Check and replace IC101.
No
Check and replace T501.
Yes IC201 Pin 26 output exists and varies with different patterns? Yes Done No Check and replace IC201.
PN15VT/VO PN15HT/HO
5-7
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