NAD T517AHT Service Manual page 21

ELECTRICAL TROUBLESHOOTING GUIDE
B
Does
the SLED move
to inner side when it is
at outter position?
YES
Do not put in
disc and tray close.
Optical Lens
has movements for
searching
focus?
YES
C
Motor
NO
driver STBY pin
is high?
Is FMSO
DC level higher
than 1.4V?
SL+
and SL- output
properly?
Check the cable
connection with MECHA.
Proper
NO
FOSO outputs to
motor driver?
Proper
F+ & F-
outputs?
Check cable connect on
with pick-up head.
3-8
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
Check the connection
line of STBY signal.
Check the related
circuit of FMSO.
Check the amp circuit
on motor driver.
Check FOSO connection on
MT1389S and motor dirver.
Check the amp circuit
on motor dirver.