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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
NN-P795 NN-P794SFR
4 SIMPLE WAY OF H.V. INVERTER/MAGNETRON TROUBLESHOUTING
Purpose: Simple way (3/23 seconds rule) of identifying whether it�s Magnetron, Inverter, or others. Set-up: The unit under question is connected through the Ammeter as shown below.
Procedure: Follow the matrix table below to identify the problem source. Note: Do not replace both Inverter board and Magnetron simultaneously and automatically without going through this procedure.
Power will: Ammeter reading is: Shut off in 23 seconds 1. Between 0.5A and 1.0A. after �Start�. 2. Between 1.0A and 2.0A. To do: Remedy: Check and repair open magnetron circuit Open magnetron wiring between Inverter and magnetron terminal. Check continuity of D702 in Inverter PCB.
1. D702 shorted
Shut off in 3 seconds 1. Less than 0.5A after �Start�
Replace H.V.Inverter (F606Y6G00AP/F606Y6G00CP) 2. D702 is OK Replace magnetron Check open circuit: Latch Switch, DPC, Replace defective component(s), or Power Relay and CN701 correct switch, cables and connectors.
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