NAD 300 Service Manual page 16

Symptom
Cause
and RemedY
J)
Defective
capacitor C2O2,
C208
or C222'
Replace
the defective caPacitor.
Defective
transistor TR
101, 1 R1O2, TR
1
03
coil L101,
L104 of tuner
f
ront-end.
Replace
the defective comPonent.
Faulty
lead-in.
Repair
or
rePlace
the
lead
in,
K)
L)
n
lmproper adjustment
Readjust
f2O1, VR301
and
VR303a, b'
(Refer to
MPX
ALIGNMENT on page
1
1')
Defective
transistor TR301, T8302, TR303 or
lC lC3O1, lC3O2
of Turner Board
0036'
Replace
the defective comPonent.
Variable resistor V
R301 defective.
Replace
the variable resistor.
Variable resistor VR303a, b defective.
Replace
the defective variable resistor'
B)
C)
D)
12\
Poor
multiPlex seParation.
13)
Stereo
indicator lamp does
not light'
A)
Defective indicator
lamP
PL9.
Replace
the
lamP.
lmproper adjustment
of
VR301 and VR302 of
0036 TUNER BOARD.
Make readjustment.
(Refer to
MPX
ALIGNMENT on
page
1
1')
Defective
lC3O1
or
R835
of 0036 TUNER
BOARD.
Rep
lace
defective comPonent.
lf
volume both L and R
channels
not enough:
Front End defective,
or faulty IFT T201 or
diode D207, D2OB
of
0036 TUNER BOARD or
faulty
C313, lC3O1
or
1C302
of 0036 TUNER
BOARD.
Locate and replace
the defective component'
lf
sound
of
one
channel
not
enough:
Defective
lC3O2
of 0036 TUNER BOARD'
Replace
the
lC.
B)
c)
A)
B)
14\
FM
volume not sufficient'
15)
AM
does
not operate'
A)
Damaged lC4O1
of Tuner Board
0036'
Replace.
B)
Defective
Coil L401 ,T4O1or
Ceramic
Filter
CF4O1
of
0036
Tuner Board'
Replace
the defective comPonent'
C)
Selector
switch
S1
defective.
Repair
or
rePlace
the switch.
D)
Defective
Tuning
Gang.
Replace.