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Awesome manual. Complete diagrams of all board assemblies as well as how to get to each part of the t.v. down to the individual screws and their locations. Get it.
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perfect copy, im very satisfied, i was need the diagram over the powersupply and
the copy was very sharp
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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.
1-7
Trouble shooting chart
Distorted audio and loud noise
Distorted audio and loud noise Yes Check the power supply voltages +12V to the operation amplifying Q27 and -12V are normal. Yes
No Check Q27
Check whether the muting transistor R176 andR175 are normal Yes
No Replace R176 and R175
Check whether the muting transistor Q17,Q18, are normal Yes
No Replace Q17~Q18
Checking the U15 leads the feet has no to break to open Yes
No
Correct connection
Replace U1 No if the clock signal AOUT0, ABCK and ALRCK output by U1 are normal
SACLK waveform
SBCLK waveform
SSLRCK waveform
Yes
Check whether the U1 or U15 powersupply normal Yes
Replace U1 or U15
No Check U15
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