Sharp 13VT-K100 - System Control and Capstan Motor Troubleshooting

13VT-K100/150
13VT-CK10
44
NO NO NO NO NO
SYSTEM CONTROL TROUBLESHOOTING FLOW CHART NO.1-5 FLOW CHART NO.1-6
No power.
YES YES YES YES YES
NO NO NO NO
YES YES YES YES
Check IC2001 and IC7701.
Check IC7701.
Check IC765 (PC9V GEN.)
Check Q756 (PC5V GEN.)
Check the AT5V line.
Check pin (74) of IC7701
Check the AT8V line or the AT12V line.
Does power control (H) signal at pin (21) of IC7701 change from "L" to"H" level? Check peripheral circuit for poor soldering of PC9V and PC5V lines. Are serial clock pulse and TV data pulse applied to pins (67) and (66) of IC7701 from IC2001?
Are system control data pulse and system control ready pulse applied to pins (36) and (35) of IC2001 from IC7701?
Check between the MC connector and IC7701, and between the MC connector and pin (75) of IC7701.
CAPSTAN MOTOR TROUBLESHOOTING
The capstan motor fails to run.
Is the voltage more than about 2.6V given to pin (4) of AC connector?
Is the voltage at pin (3) of AC connector 1.8~2.7V?
Is 5V at pin (8) of AC connector?
Check/replace the capstan motor.
Is the PC5V line normal?
Is the PC9V line normal?
Is 8V or 12V at pin (5) of AC connector?