Service manual

47
13VT-R100/R150
13VT-CR10
NO
CAPSTAN SERVO TROUBLESHOOTING FLOW CHART NO.1-13
Capstan servo does not function.
YES YES
Check X7701, C7708 and C7707.
Is there 14MHz oscillation at pin (37) and (38) of IC2001?
When playback using the recorded tape from a normal set, does capstan servo functioning?
When using the same tape, is there a PB CTL OUT signal detected at pin (76) of IC2001? Is there a normal capstan FG IN signal at pin (67) of IC2001?
Is there a normal capstan FG at pin (6) of AC connector? Check capstan FG line.
Check IC2001.
Check IC2001.
Are the duty ratio of CAP AFC PWM at pin (31) and CAP APC PWM at pin (33) of IC2001 change according to the number of capstan motor rotation? (slowing down the capstan motor by touching with your finger)
Check connection between AA and MH connector. Clean the A/C Head. Check the azimuth and height of the A/C Head.
Check connection between pin (5) and (6) of AA connector and pin (74) and (75) of IC2001.
YES
YES
YES
Is the voltage at pin (4) of AC connector change according to number of motor rotation?
Check connection between AC and MC connector. Change capstan motor.
YES
Check connection between pin (31) and (33) of IC2001 and pin (4) of AC connector.
YES YES
At the REC mode, is there a REC CTL signal detected at pin (74) and (75) of IC2001?
YES
Is there a REC CTL signal detected at pin (5) and (6) of AA connector?
YES
YES
Check connection between AA and MH connector. Check the cleanliness, azimuth and height of A/C Head.
Does drum servo functioning?
Change A/C Head.
NO
NO NO NO
NO
NO
See FLOW CHART NO. 1-12.
NO
Check IC2001.
NO
Check the REC CTL signal line.
NO