This is a good quality scan of the service manual which includes an assembly diagram, block diagram, schematic, and parts list. Exactly what is needed to repair my KR-V55R receiver.
Text excerpt from page 15 (click to view)
TROUBLE SHOOTING
NO SOUND(All source)
Check the output of Q670. Check the existence of the waveform of C682, C681, and C683.
OK
Check the connection with SPK.
NG
Check the voltage of Q670. Pin8 13.25V/Pin9 26.50V Pin11 13.25V/Pin12 13.25V
NG Check the Q670 recheck
NG To power supply block
OK
OK
Check the existence of the input waveform of Q670.
OK Check the Q670
NG
Check the voltage of QS102 and Q601. Pin8 22V OK
NG
QS102 and Q601 exchange
Check the existence of the input waveform of QS102 and Q601. NG
OK QS102 and Q601 exchange
Check the voltage of H002. Pin27 9V Pin11 5V OK
NG
To power supply block
Check the existence of the input waveform of H002. NG
OK
H002 exchange
Check the power supply voltage of QS01. Pin32 9V OK
NG
To power supply block
Check the existence of the input waveform of QS01. Pin33 Pin34 NG H002 exchange
