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Trouble Shooting Chart
Startpoint symptom:
No picture/No sound
~
-------
-------
------------------
No :
1
I
Is CRT heater lighting ?
>! Go to chart "Dead"
I 1
1
I
1
I I
I
I
I
Yes
L---____________________J-------_J
Chick voltage(+33V)
on both
OV
*
R716, D704, C716
ends of D704
I
33V
Check tuning circuit
Is tuning voltage changing on
NO
IC701 , C745, L702, R758, Q711,
>
terminal TU on tuner when tuning
L706, R765, R763, R704, R705,
C707, C708, Cl 05, X701, R755,
Yes OV to 33V
R756, R744, R746, C781 , C782,
L705
J
I
1
Is supply voltage(+l
2V) observed
No
VL: Q781 , R778, Cl 03
on terminal LB, HB, UB on tuner
-
VH: Q782, R777, Cl 04
1
UHF: Q783, Q784, R786, R787,
Yes
C106
Check AGC voltage on terminal
OV or 8V
>
AGC on tuner
C131, R133, C130, C128
.1
3V-6V
OV or 8V
Check voltage on pin 49 of IC101
*
VR120, R127, R126, C128
I
1
3V-6V
Check tuner and IF peripheral
circuit
IC1O1, AIO1, QIO1, R103, C115,
T121, L121, C129, C119, X1OI
-45-
AAI -A
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