NAD 300 - Page 15

t:
Symptom
Cause and
Remedy
6)
Same as 5 above
but channel operates
when test signal
is applied as
7.
A) Defective
transistor TR501, TR502, TR503,
or
TR504.
Replace
the defective transistor.
B) Faulty resistor
R502, R504, R505, R506,
R51O
or R512.
Replace
the
faulty
resistor.
C) Faulty capacitor
C501 or C505.
Replace
the faulty capacitor.
D) Defective
selector switch S1.
Repair or replace
the
switch.
7\ Speaker works normally
but
headphones do not work.
A)
Headphone
plug
does not mate
with
jack.
Replace
the
plug.
B) Defective
resistor R651a, b.
Replace the resistor.
8) All the inputs work
normally
except
AUX
input.
A)
Poor
contact
in AUX input
jack.
Repair or
replace the
jack.
B)
Poor
contact
in
selector
switch
S1
9)
PHONO input not operative.
A) Poor contact
in
PHONO
input
jack.
Repair or replace
the
jack.
B) Faulty selector switch S1.
Repair or
replace the switch.
10) TAPE
OUT
not operative.
A) Defective contact
in
TAPE OUT
jack.
Repair
or
replace the
jack.
1 1
)
FM
does not operate.
A) Defective diode
D833.
Replace the diode.
Transistor
TR831 damaged
(open).
Replace
the transistor.
Defective
resistor R831.
Replace
the resistor.
Short-circuit
in Tuner B+ circuit.
Repair the short.
Poor
contact
in
selector
switch S1.
Repair or
replace the switch.
Resistor
R301 defective.
Replace
the resistor.
Capacitor
C301
defective.
Replace the capacitor.
Defective
lC 1C201
,lC2O2,lC203
or
1C301.
Replace
the defective
lC.
Defective
IFT T201.
Replace
the lFT.
B)
C)
D)
E)
F)
G)
H)
t)
15