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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
SD-CX1H
� The triangular wave for focus servo does not appear.
Is +3.3V applied to pin 6 on IC3 ? No Yes Does the triangular wave appear at pin 33 on IC3 ? <Refer to the waveform diagrams on page 73.> Yes Does the triangular wave appear at pin13 of IC1 ? <The same waveform as above> Yes Does the saw tooth wave appear between pins 3 and 4 of IC1 ? <Refer to the waveform diagrams on page 73.> Yes Does the saw tooth wave appear between pins 3 and 4 of CNS2 ? <The same waveform as above> Yes The PWB pattern has been cut. No The connection of CNS2 is poor or the optical pickup is defective. Check the parts around IC1 and the power supply line. IF OK, IC1 is defective. No The connection of signal lines between pin 33 on IC3 and pin 13 on IC1 is poor. No Check the parts around pin 33 on IC3. If OK, IC3 is defective. The +3.3V line of IC3 is defective.
No
� The disc motor CLV servo is defective.
Does the disc motor rotate in the CD test mode 3 ? Yes
No
Is the voltage applied between pins 27 and 28 of IC1 for about 0.3-1.5 seconds when switching from the CD test mode 2 to 3 ?
Yes
The disc motor is defective or wires have broken.
0.3~1.5 seconds
No
Does the disc motor rotate too rapidly or slowly ? Yes
Is the pin 41 on IC3 in the high state for 0.3-1.5 seconds and does it pulse when switching from the CD test mode 2 to 3 ? <Refer to the waveform diagrams on page 72.> Yes
No
IC3 is defective.
5V 0.3~1.5 seconds
C3 is defective or wires have broken. Does the eye pattern appear at pin 19 on IC2 ? <Refer to the waveform diagrams on page 72.> (It is OK even if the waveform is not clear.) Yes (Vp-p 1.2V waveform) Recheck whether the optical pickup objective is dirty. If it is dirty, clean it. Check the connection between pin 19 on IC2 and pin 24 on IC3. If OK, the optical pickup is defective.
No
Is the eye pattern Vp-p 1.2V inputted to the pin 24 on IC3 ? Yes
No
Check the PWB pattern and C33.
IC3 is defective. (After checking the parts around it, replace it.)
� 77 �
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