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7-2-17 Micom Failure Continued
Are H/V sync input on
24 25
IC202's Pins 29 and 30?
Yes
Check signal cable.
Yes
Check D211 ~ D215.
Yes
Check PCB pattern to Pins 30 and 31.
WAVEFORMS
24
5.28 V (IC202, #30)
CH1 P-P = 5.28 V
CH1 RMS = 1.218 V
CHA42*7L/5**7L
Yes
25
4.96 V (IC202, #30)
CH1 P-P = 4.96 V
CH1 RMS = 350 mV
When disconnecting signal
cable: Is 0V on IC202's Pin 13?
When connecting signal cable:
Is 5V on IC202's Pin 13?
Yes
Sus (Pin 7) : 0 V,
Off (Pin 8) : 5 V?
Yes
LED is ok?
Yes
Are H/V sync input from
IC202 on IC401's
26 27
Pins 1 and 2?
Yes
2
Refer to 7-2-13 I
C Failure.
26
5.48 V (IC401, #1)
CH1 P-P = 5.48 V
CH1 RMS = 1.362 V
No
No
No
No
27
4.48 V (IC401, #2)
CH1 P-P = 4.48 V
CH1 RMS = 284 mV
7 Troubleshooting
Cceck and replace
R201, IC202,
Signal cable.
Check signal cable.
Replace it.
Check PCB pattern to
IC401.
Replace IC202.
7-21
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