20
20U200, 20U250
51U200, 51U250
51U500, 51U550
20-1
20-2
TROUBLE SHOOTING TABLE
(Continued)
NEITHER VERTICAL NOR
HORIZONTAL SYNCHRONIZATION
CIRCUIT TO BE CHECKED:
»
Sync. Separator Circuit.
NO VERTICAL SCAN
Check R503, R506, R513,
C517 and D501.
DEFECTIVE VERTICAL AMP.
AND VERTICAL LINEARITY
Readjust vertical size.
(Bas Data)
Check pins (33) and (34) of
IC801.
Check IC501.
Check C503 and C507.
Check IC501.
Normal
Abnormal
Vertical linearity and size
abnormal.
TROUBLE SHOOTING TABLE
(Continued)
NO SPECIFIC COLOUR
Is some colour produced in
B/W broadcast reception ?
Is the white balance properly
adjusted ?
Readjust the white balance.
The picture colour is yellow.
The picture colour is magenta.
The picture colour is cyan.
Check Q871, Q883 and its
adjacent circuits.
Check Q870, Q885 and its
adjacent circuits.
Check Q872, Q887 and its
adjacent circuits.
Check IC801 and bias
control circuit.
Normal
NO SPECIFIC COLOUR
“PAL/SECAM”
(NO COLOUR SYNCHRONIZATION)
NO
YES
YES
NO
Check IC801, R801, R802,
R803, D804, D805, D806
and Q801.
Check X1001(12 MHz).