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Trouble Shooting Chart
Startpoint symptom:
No sound-picture
OK
(Monaural
model)
No sound-picture
OK
(Monaural Model)
Select correct sound system
NG
v
w
Check voltage on pin 15 of IC701
IC101, C132, R767, C718,
Q700, R706
llV
IC101, Q172, R168, D528,
Check voltage on pin 3 of IC1101
R526, C523, D526, R179
1
I
Ov
1
Check voltage on pin 4 of ICI101
Ov
when maximum volume setting
C1112, R1129, C706, R731,
Q705, R708, C703
I
6-8V
Check waveform on pin 2 of
w
Icllol
+
IC1lO1, C1lO1, C1116,
I Check audio output circuit
[
I
1
speakers, headphone
I
i
1
I
No
Check waveform on pin 50 of
m
Yes
Iclol
-
C1117, C1123, R170
I
!
I
No
\
'
~ Check SIF filterina circuit
No sound on 4.5 MHz------ Check Qll 2, Q152, Xl 51, Q1 53, Q157 peripheral circuit
No sound on 5.5 MHz------ Check Q113, Q154, Xl 52 peripheral circuit
No sound on 6.0 MHz------ Check Q113, Q155, X153 peripheral circuit
No sound on 6.5 MHz------ Check Qll 3, Q156, Xl 54 peripheral circuit
All of systems ---------------- Check Qlll,
R150, Rlll,
C143, R116, C122, C123, C128, R125
~eri~heral circuit
-49-
AA1-A
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