NAD T517AHT Service Manual page 23

ELECTRICAL TROUBLESHOOTING GUIDE
D
Focus on OK?
YES
Track on OK?
YES
Disc is play?
YES
E
Proper
NO
signals on A, B, C, D of
MT1389S
Check FEO signal
on MT1389S
Check FOSO
signal on MT1389S
Normal
NO
TEO Signal on
MT1389S?
Properly
TRSO signal on
MT1389S?
T+ & T- output
properly?
Check cable connection
on pick-up head.
Check RFO & RFLVL
NO
signal waveform.
3-10
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
Check connections between
MT1389S and pick-up head.
Check the FOSO connection
on MT1389S and motor driver.
Check the related
circuit on MT1389S
Check the TRSO
connection on MT1389S
and motor dirver.
Check the tracking control
amp circuit on motor driver.