NAD T515C Service Manual page 19

D
Focus ON OK?
YES
Track On OK?
YES
Disc is play ?
YES
E
NO
Proper signals on A,B,C,D
of ZR36888
Check FE signal on
ZR36888
Check FOCUS_S signal
on ZR36888
NO
Normal TE Signal on
ZR36888?
Properly TRACK_S signal
on ZR36888?
TACT+ & TACT- output
properly?
Check cable connection on
pick-up head.
NO
Check RF signal waveform.
3-8
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
Check connections between
ZR36888 and pick-up head.
Check the FOCUS_S
connection on ZR36888
and motor driver.
Check the related
circuit on ZR36888
Check the TRACK_S
connection on ZR36888
and motor dirver.
Check the tracking control
amp circuit on motor driver.