Zenith DV140 Service Manual page 18

D
Focus ON OK?
YES
Track On OK?
YES
Disc is play ?
YES
E
NO
Proper signals on A, B, C,
D of MT1389D
Check FEO signal on
MT1389D
Check FOSO signal on
MT1389D
NO
Normal TEO Signal on
MT1389D?
Properly TRSO signal on
MT1389D?
T+ & T- output properly?
Check cable connection on
pick-up head.
NO
Check RFO & RFLVL signal
waveform.
3-8
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
Check connections between
MT1389D and pick-up head.
Check the FOSO connec-
tion on MT1389D and
motor driver.
Check the related
circuit on MT1389D
Check the TRSO
connection on MT1389D
and motor dirver.
Check the tracking control
amp circuit on motor driver.