JVC TV-13142 Service Manual page 51

TAPE LOADING IS OK, BUT
UNLOADS IMMEDIATELY
Does CYLINDER rotate ?
Yes
Does TP1002 feed
HEAD SWITCHING
PULSE signal ?
50 Hz
Yes
Does pins 79 and 80 of
IC1001 feed REEL SENSOR
PULSE signal ?
No
Check REEL SENSOR.
TROUBLESHOOTING GUIDE
Is the voltage at pin 2 of
No
CP1005, unregulated at
12V ?
Yes
In playback, is the
voltage at pin 5 of
CP1005 1.3V ?
Yes
Replace CYLINDER UNIT.
No
Does PG PULSE
No
signal, 4.2Vp-p appear
at pin 90 of IC1001 ?
Yes
Replace IC1001 and IC1004.
Yes
No
Check Power circuit.
No
Dose pin 77 of IC1001
feed DC5V PULSE?
Yes
Check R1017 and R1029.
TV-13142
TV-13142W
No
51