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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.
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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.
3. The base and handset cannot be connected.
Check whether the base NG is able to set in the test mode 1. OK Check the TX POWER NG and the TX FREQUENCY on the base unit. OK Set the base in the test NG mode 3, check whether deviation of the TX data is app. 8 kHz Dev. OK Check base RF unit. Check whether there is a NG 250 Hz data waveform at �MOD� of RF unit. OK Check RT3, R40, R68, R69, R53, R70 and C79. Check base RF unit. Check IC5 and its peripheral circuit.
Set the base in the test NG mode 8, 902.952467 MHz (250 Hz ±8 kHz Dev.) 1mV output signal from RF jack is applied. Can the status LED be lighted? OK
Check whether there is a NG 250 Hz data waveform at pin 9 of IC3. OK
Check IC3, Q1 and their NG peripheral circuit. OK
Check base RF unit.
Check whether there is a NG 250 Hz data waveform at the Q2 collector. OK Check whether there is a NG 250 Hz data waveform at pin 38 of IC5. OK Check IC5 and its peripheral circuit.
Check RT2, Q2 and their peripheral circuit.
Check R42, R46, IC1 and their peripheral circuit.
Check whether the NG handset is able to set in the test mode 1. OK Check the TX POWER NG and the TX FREQUENCY on the handset unit. OK A
Check IC604 and its peripheral circuit.
Check handset RF unit.
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