NAD 705 - Troubleshooting and Packing; Troubleshooting Guide

TROUBLESHOOTING
GUIDE
CIRCUIT I SYMPTOM
CAUSE
REMEDY
Defective ON/OFF switch .
Replace or repair as required .
Defective band
selector switch . Replace
or repair as
required .
NO SOUND
(Unit
Defective volume control .
Check volume control resistance
GENERAL
does not work at all)
for continuous operation .
Replace if
necessary
.
Defective speaker .
Replace speaker .
Defective speaker jack .
Replace or repair jack .
Defective band selector switch .
Replace or repair switch .
Defect in I FT T407
Check voltage and current for this
circuit
.
NO SOUND I Open circuit of AM I F
Check resistance .
transformer .
Defective
AM
ant . coil, or OSC . Replace if necessary .
coil
.
AM
IF tuning faulty .
Readjust (see Alignment instruc-
tions) .
R F tracking faulty . Readjust (see Alignment
instruc-
WEAK SOUND
tions) .
(Low sensitivity)
Defective
IC401
Check voltages .
Replace if necessary .
Poor contact in antenna
circuit . Check resistance .
and resolder .
Defective
band selector switch . Replace or repair the switch .
NO SOUND
Open circuit of FM
ant . coil, Check resistance .
or OSC . coil .
Replace if necessary .
FM
Defect in FM tuner circuit .
Check
R F,
IF and detector circuit .
eNo FM MPX
Check
voltage
and
current of
transistors .
separation
Replace parts if necessary and
*No stereo
WEAK SOUND
readjust FM tuner .
light or FM
stereo does
(Low sensitivity)
I F tuning faulty .
Check the function of IC401 .
not work
RF tracking faulty .
Readjust (see Alignment instruc-
tions) .
Defective I C401 I Check
voltage
and
current .
Poor contact in FM antenna I Resolder
or
repair
as required .
circuit
.