Sharp 20CT-250 Service Manual page 16

TROUBLE SHOOTING TABLE
NEITHER VERTICAL NOR
HORIZONTAL SYNCHRONIZATION
CIRCUIT TO BE CHECKED:
» Sync. Separator Circuit.
Check IC801 and Q401.
DEFECTIVE VERTICAL AMP.
AND VERTICAL LINEARITY
Readjust vertical size.
(Bas Data)
Vertical size is abnormal.
Check R510, C513, C514
and C501.
NO VERTICAL SCAN
Check IC501 bias.
Normal
Check C506.
(Continued)
Vertical linearity is abnormal.
Check C515, C519, R511,
R513 and R514.
Abnormal
Check IC501.
16-1
TROUBLE SHOOTING TABLE
NO SPECIFIC COLOUR
NO
Is some colour produced in
B/W broadcast reception ?
Check IC801, R809, R810,
R811, D801, D802, D803,
Q801, Q802, Q803,Q804
and Q805.
The picture colour is cyan. The picture colour is magenta.
Check Q851 and its Check Q852 and its
adjacent circuits. adjacent circuits.
NO SPECIFIC COLOUR
"PAL"/"NTSC"/"SECAM"
(NO COLOUR SYNCHRONIZATION)
"PAL"/"NTSC"
Check IC801 and bias
control circuit.
Normal
Check X801, C810, C815,
C816 and R814.
16-2
(Continued)
YES
YES
Is the white balance properly
adjusted ?
NO
Readjust the white balance.
The picture colour is yellow.
Check Q853 and its
adjacent circuits.
"SECAM"
Normal
Check C901 and pin (31) of
IC1001.