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TROUBLESHOOTING: (Refer
to the circuit
diagram and printed board.)
Symptom
Faulty circuit
Place,
cause
of fault
Action
No sound at all
Power supply
circuit
a
Fuse open
a
Bypass
capacitor short
o
T1
(choke) open
a
L.t (coil)
open
o
Cso,
n
n6-470l,
, Ce3
(1O-330)
faultv
O
Rr:.
R75 oPen
ta
Zeener
diode (D7)
short
Replace
Replace
Replace
Replace
Replace
Replace
Replace
AF circuit
a
Speaker
faulty
o
Speaker
lead
open
o
Bypass
capacitor short
o
Ctd,
e1
(10-lOOO)
faulty
o
tC2,
r
(051-0036-02,
O3)
faultY
Replace
Replace
Replace
Replace
Replace
AM
section
o
lFT4,5
open
o
Os, ro,
1l
faulty
o
TCa,
s,6
short
o
Tuner
coil (Ll
)
open
o
C+r,
Ccq,
Cqs,
C5s faultY
Replace
Replace
Replace
Replace
Replace
FM section
O
a
lFT1,2,3open
O1
-
s
faultY
Tuner coil
open
lcr
(051-0056-o0)
faulty
CCTa,
5
faultY
o
o
a
Replace
Replace
Replace
Replace
Replace
Sound
is
low or sensitivity
is
poor
AF circuit
I
lCz
o
Cto
o
Ctt
3
(051-0036-02,
O3)
short
or faulty
el
(10-10OO)
capacity
down
qz
(5O-11 leaking
Replace
Replace
Replace
AM
section
3
TC+,
5, 6
misad.iusted
o
Lr
coil
open
o
Oq,
to,
ll
deteriorated
o
lFTq,
5 misadjusted
.
Dq
(1520761
deteriorated
o
Tuner
coil
open,
etc.
Read.iust
Replace
Replace
Readjust
Replace
Replace
FM section
I
TCr,
2, 3 misadjusted
a
Ot
-
Sdeteriorated
o
lFTr,
3
misadjusted
o
Tuner coil
open, etc.
'
Dz,
3
deteriorated
a
ANT
shield
wire
ooen
or
short
Readjust
Replace
R
eadj usl
Replace
Replace
Replace
o
AM,
FM
s
,atch
taulty
a
ANT
receptacle
contact
faulty
Heprace
Replace
Sound
is
distorted
AF
circuit
I
lCz,3
(O51-0036{2,03)
short or faultv
a
Speaker
faulty
Replace
Replace
AM
section
3
R+e,
Rr:,
Ds,
D5s faultY
Replace
FM section
o
Os,
lCr
(051-0056-O0) faultY
o
Dz,
g
faulty
o
CCT:
faulty
or
short
Replace
Replace
Replace
Abnormal
sounds
(motorboating, osillation)
AF
circuit
a
Cgr,
Cqo, C9?
capacity
down
lC2, 3 (051-0036O2, 03)
faulty
a
Replace
Replace
AM
section
o
Cqq,
C+s, Css, Cso, Css,
C51
faultY
Replace
FM section
'
Csz,
33, 94
capacity
down
a
Each bypass
capacity
faulty
O
Fach
clecouolino caoacitor
faultv
Replace
Replace
Renlace
o
C9s capacity
down
Replace
lndicator
does
not light
MPX section
3
VR+, s
misadjusted
a
SWr
faulty
o
C:+,
Ca?
capacity
down or faultY
I
PLz,
R46 oPen
or faultY
Readj
ust
Replace
Replace
Replace
Stereo
offect
is
absent
MPX section
o
Cso, Caz,
Crs,
C36
faulty
I
Rea,
R37 oPen
Replace
Replace
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