5 Troubleshooting
5-4
720C/920C
5-1-4 S Correction Failure
S1~S5 signals are right at each
frequency block?
Check S1 ~ S5 signal.
Check and replace
C430, C431, C433, C434, C435,
C437 C441, C453, C454, C455, C456, C457,
Q409~Q413, Q451~Q455, Q456~Q460 .
Yes
5-1-5 H_Lin. Failure
IC201 Pin 21 voltage varies with
different H_Lin. DAC values?
IC403 Pin 7, 8 voltage varies with
different H_Lin. DAC values?
Check +12 V line.
Check some parts around IC403.
Check L403.
Yes
Yes
No
Check and replace IC201.
No
Replace IC201.
No
5-1-6 Invariable H_Size
IC261 Pin 28 voltage varies with
different H_Size DAC values?
IC401 Pin 6 output duty varies with
different H_Size DAC values?
Check some parts around IC261 Pin
28, IC401.
Yes
No
Check and replace IC261.
No
Содержание 720C
Страница 33: ...720C 920C 6 1 6 1 720C Exploded View and Parts List ...
Страница 34: ...720C 920C 6 2 6 2 920C Exploded View and Parts Lists ...
Страница 79: ...T601 C639 C609 C636 C638 L601 C604 D637 D608 10 1 Power Parts Schematic Diagram 720C 920C 10 1 ...
Страница 80: ...R299 720C 920C 10 2 10 2 MICOM Parts Schematic Diagram ...
Страница 81: ...720C 920C 10 3 10 3 Horizontal Vertical Processor Parts Schematic Diagram R265 C272 R262 ...
Страница 83: ...R561 R562 R501 C530 L521 R523 R526 720C 920C 10 5 10 5 High Voltage Parts Schematic Diagram ...
Страница 84: ...720C 10 6 1 10 6 1 720C Video Parts Schematic Diagram ...
Страница 86: ...720C 920C 10 7 10 7 Connector and Option Boards Parts Schematic Diagram CN142 slcon4p slcon4p CN141 CN208 ...