NO.10 LOADING AND EJECT FLOW CHART NO.12 CAPSTAN MOTOR TROUBLESHOOTING
VC-H9888U
cassette tape come out. The capstan motor fails to run.
NO button is pressed? MOTOR TROUBLESHOOTING given out pin(32) of IC701?
NO Does capstan motor start when EJECT See FLOW CHART NO.12 CAPSTAN Is the voltage more than about 2.6V DC
Check IC701.
YES
Check PC 5V line.
Check disk and reel drive Is supply voltage 5V fed to pin(8) of NO Does take-up reel disk turn when the capstan motor is running? AC connector?
YES
unit.
With take-up disk running, is the reel Check line between pin(2) of IC701 Is voltage more than 2.6V DC sent in NO Check line between the AC connector and pin
and take-up reel sensor. pulse signal being fed to pin (2) pin(4) AC connector? (32) of IC701?
YES YES
Is the pin (4) of IC705 at "H" level(about 1.7V) Is the voltage pin(3) of AC connector 1.6 NO when the reel pulsesignal is inputted? ~2.7V?
Check pin(92) of IC701.
Check pin(60) of IC701.
YES
YES
Is 12V voltage fed to pin (5) of AC NO
Check IC705. (in normal mode) IC705?
Check the capstan power supply circuit . Is the voltage about 10V sent out from pin(7) of Check D957 and the STBY 12V line.
Replace capstan motor. Check Q955 Q958, D962 thru Is specified voltage applied at the loading NO Check line between IC705 and
connector?
YES (in high-speed FF/REW mode).
motor terminal? loading motor. D967 and the STBY 23V line.
NO
14
FLOW CHART NO.13 DRUM MOTOR TROUBLESHOOTING(1)
YES
NO and pin(31) of IC701. Does power control (H) signal at pin(94) pin(7) of AD connector?
YES
Does the motor run? Replace loading motor.
YES
Replace cassette cam, gear, etc.
The drum motor fails to run.
FLOW CHART NO.11 SYSTEM CONTROL TROUBLESHOOTING
NO Is the voltage more than about 2.6V DC fed to
No power is turned on. pin(31) of IC701?
NO Check line between pin(7) of AD connector Is the voltage more than about 2.6V DC fed to
Check IC701.
IC701 change from "L" to "H" level?
Check IC701.
YES
YES NO
Check STBY 12V line.
YES
NO Is voltage 5.0V sent out from the emitter of
Is the voltage 12V fed to pin(4) of AD
Does the base voltage Q951 change from NO Check line between Q952 and pin(94) of connector? about 5.0V to 4.5V? IC701.
