19
20GT-15
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.
Check pins (33) & (34) of
IC801.
DEFECTIVE VERTICAL AMP.
AND VERTICAL LINEARITY
Re-adjust Vertical Size.
(Bas Data)
Check IC501.
Check C503 amd C507.
Check IC501.
Normal
Abnormal
Vertical Linearity and Size
are abnormal.
TROUBLE SHOOTING TABLE
(Continued)
NO SPECIFIC COLOUR
Is some colour produced in
B/W broadcast reception?
Is the white balance properly
adjusted?
Re-adjust 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 SPECIFICATION COLOUR
“PAL/SECAM”
(NO COLOUR SYNCHRONIZATION)
NO
YES
YES
NO
Check IC801, R801, R802,
R803, D804, D805, D806,
Q801.
Check X1001 (12MHz).
Summary of Contents for 20GT-15
Page 23: ...21 20GT 15 CHASSIS LAYOUT ...
Page 24: ...20GT 15 20GT 15 22 23 BLOCK DIAGRAM MAIN UNIT BLOCK DIAGRAM ...
Page 25: ...20GT 15 24 CRT BLOCK DIAGRAM ...
Page 26: ...25 20GT 15 WAVEFORMS ...
Page 30: ...29 20GT 15 A B C D E F G H I J 1 2 3 4 5 6 7 8 9 10 CRT UNIT ...
Page 34: ...20GT 15 36 A B C D E F G H I J 1 2 3 4 5 6 7 8 9 10 PWB B CRT UNIT ...
