It's great to be able to obtain a precious technical information for a real old equipment. The one I got helps me a lot in the area of wiring diagram to repair my antique. PDF gave me clear enough information to find out thr details. Thanks for giving me the oppotunity to be able to access to almost vanished informations.
Very useful, not the best scan, but definitely readable !
Text excerpt from page 3 (click to view)
SECTION 1 SERVICE NOTE
Clearing the Protector During Repairs
� OVER CURRENT : Detects overcurrent during output. � OFF SET : Detects DC offset at the speaker terminal. 1. Clearing the OVER CURRENT protector 1 When the position of the MODE switch (S801/power board) is set to HI-VOLTAGE : Cut the jumper wire JW535 of the amplifier board. 2 When the position of the MODE switch (S801/power board) is set to HI-CURRENT : Cut the jumper wire JW690 of the amplifier board. 2. Clearing the OFF SET protector � Cut the jumper wire JW502 of the amplifier board. 3. TEST TONE Function 1 Press the TEST TONE button (S851/amplifier board) with the power ON. The amplifier is normal if sound is produced from the speaker. 2 If no sound : Problem causer by incorrect connecttion of the power supply system or sperker system. : The signals input by the RCA cable before the amplifier system are abnormal. Adjustment Location: - POWER BOARD - (Component side) - AMPLIFIER BOARD - (Component side)