NAD 300 Service Manual page 17

Symptom
Cause
and
Remedy
E)
Damaged
AM
bar antenna.
Repair
or
replace
bar antenna.
16)
LOUDNESS has no
effect.
A)
Defective LOUDNESS switch
S5.
Replace
the switch.
B)
Defective C758, C759
or
R765.
Replace
defective
component.
C)
Defective
VOLUME control VR551
Replace.
17l,
STEREO-MONO not effective.
A)
Defective MONO switch 56.
Replace
the switch.
18)
TAPE-MONITOR not effective.
A)
Defective
TAPE MONITOR switch 52.
Replace
the switch.
B)
Poor
contact in TAPE input
jacks.
Repair
or
replace
the jack.
19)
BASS
control
has
no effect.
A)
V
R902 defective.
Replace.
B)
Defective C905,
C906, R911, R912, R913 of
9025 Tone
Amplifier
Board.
Replace
defective component.
2Ol
TREBLE control
has
no
effect.
A)
VR901
defective.
Replace.
B)
Defective
C904, R908
or
R909
of 9025
Tone
Amplifier
Board.
Replace
the defective component.
21l,
Excessive noise
with
PHONO
(MAG) input.
A)
Faulty TR501, TR502, TR503 or TR504.
Replace
the faulty transistor.
B)
Faulty R501, R503, R506, C501 or C505.
Replace
the faulty component.
22\
Noisy VOLUME control.
A)
Defective
VR551.
Replace
the variable
resistor.
B)
Defective
capacitor C505 or
C901.
Replace
the defective capacitor.
23l'
SIGNAL meter not functioning.
A)
Defective meter.
Replace
the meter.
B)
f
n
case
of
FM reception, C209, C21O,
D203,
D2O4,
D205
or
D206 defective.
Replace
the defective component.
C)
ln
case
of AM reception, R407, R408,
R409,
R410 or
TR401 defective.
Replace
the defective component.
I
I
17