Sharp VT-3418X - Page 62

Circuit to be checked:
1. TUNER
2. PIF
3. Automatic gain
control
4. 9V power source
FLOW CHART NO.Z-3
FLOW CHART NO. l-4
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NO PICTURE, NO SOUND
I
t
Does the noise level increase at max
Contrast, Brightness, and Sound Control ?
t
Is there a
signal at
pin (7) of
IC35 1
F:4’
Check the tuner bias.
t
I
t
I
Abnormal
I
Normal
I 1
Is there a
signal at
f&E Of
t
Check
lC301
and
adjacent
parts.
Does the 9V ( + 6)
appear at pin (9) of
I
I
0
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NO VERTKAL SCAN
1
CF1601(503kHz)
IC1601 pin (29) bias check.
Normal
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r--------------------,
I
I
I
IC1801
I
L---__---------______J
c
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IC501 (lX0640CE) bias
check
r--------------------~
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RSOI, 0501,
I
I
c501 c503
:
L---------1--------_-~
I parts.
;
I
L--------------------~