NAD T515AH, Service Manual

Page: 19 / 51

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