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7-2-3 No Raster
: No Raster means (Power: OK, High Voltage: No)
Is 56 V on C517?
Yes
Is 12 V on C629?
No
Does oscillation waveform
3
appear on IC401's Pin 6?
Yes
Does horizontal output waveform
4
appear on IC401's Pin 26?
Yes
Is Q402 OK?
Yes
Is Q508 OK?
Yes
Check and replace D409, D408,
D403, D515.
Operating?
Yes
Check and replace IC401, Q403,
T401, D503, D505, D519, C440, C407,
D216, Q203, T501, CRT.
CHA42*7L/5**7L
No
Refer to 7-2-1 No Power.
Yes
Is 0 V on IC202's Pin 7 (sus)?
Are H/V sync on IC202's
Pins 29 and 30?
Check signal cable and pattern.
No
Check and replace C409,
IC401, R406.
No
Check and replace Q403, T401,
Q402, T501, Q508.
No
Replace it.
No
Replace it.
Yes
No
Yes
No
7 Troubleshooting
Check and replace
Q605, Q602, Q606,
IC101, IC401.
Check and replace
IC202.
WAVEFORMS
5.12 V (IC401, #6)
3
CH1 P-P = 5.12 V
CH1 RMS = 4.256 V
4
4.60 V (IC401, #26)
CH1 P-P = 4.60 V
CH1 RMS = 3.054 V
7-9
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