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 40 (click to view)
XA-905 XA-920
NO.10 FLOW CHART NO.11
The cassette tape fails to eject. No power is turned on.
See FLOW CHART NO.12.
pin(4) of IC701 change from "L" to
YES
Does the capstan motor start when NO Check IC701. the EJECT button is pressed? "H" level?
NO Does power control(H) signal at
YES
NO Does the take-up turn when disk reel drive unit. Does base of Q951 change from NO Check IC701 and all the way up thru
the capstan motor is running? about 5.0V 4.5V? to Q951.
YES
way up thru to IC701.
YES
Check take-up reel sensor and all the Is 5V sent out the collector of NO Are pulses applied at pin(2) of IC701 Check Q951 and the AT 5V line. Q951? when the take-up reel disk is turning?
YES
NO
Check pin(90) of IC701. soldering. pin(12) of IC706 when a reel pules
Check peripheral circuits for poor Is a "H"(about 4.7V) level applied at
has been inputted?
YES
Is the voltage about 10V sent out of NO pin(15) of IC706? Check IC706. FLOW CHART NO.12
YES The capstan motor fails to run.
NO Is specified voltage applied at Check between IC706 and all the
40
DC given out pin(29) of IC701.
YES
motor terminal? way up thru to the loading motor.
YES Is the voltage more than about 2.6V NO
Check IC701.
Does the motor run? Replace loading motor.
NO
YES Is the supply voltage of 5V feed to NO
pin(8) of AC connector?
YES NO sent in pin(4) of AC connector? and all the way up thru to pin(29) YES
Check PC 5V line.
Replace cassette cam, gear, etc.
Check between the AC connector Is the voltage more than 2.6V DC of IC701. Check between the pin(92) of IC701 Is the voltage at pin(3) of AC NO and all the way up thru to pin(3) of connector about 3.5V? AC connector.
YES NO
Is the supply voltage of 23V feed to pin(5) of AC connector? YES
