7 Troubleshooting
CHA42*7L/5**7L
7-21
Cceck and replace
R201, IC202,
Signal cable.
When disconnecting signal
cable: Is 0V on IC202’s Pin 13?
When connecting signal cable:
Is 5V on IC202’s Pin 13?
No
Are H/V sync input on
IC202’s Pins 29 and 30?
Yes
24 25
7-2-17 Micom Failure Continued
Check signal cable.
Sus (Pin 7) : 0 V,
Off (Pin 8) : 5 V?
No
Refer to 7-2-13 I
2
C Failure.
Check signal cable.
Replace it.
Yes
LED is ok?
No
Yes
Check PCB pattern to
IC401.
Replace IC202.
Are H/V sync input from
IC202 on IC401’s
Pins 1 and 2?
No
Yes
Yes
Yes
Check D211 ~ D215.
Check PCB pattern to Pins 30 and 31.
Yes
Yes
WAVEFORMS
24
5.28 V (IC202, #30)
CH1 P-P = 5.28 V
CH1 RMS = 1.218 V
25
4.96 V (IC202, #30)
CH1 P-P = 4.96 V
CH1 RMS = 350 mV
26
5.48 V (IC401, #1)
CH1 P-P = 5.48 V
CH1 RMS = 1.362 V
27
4.48 V (IC401, #2)
CH1 P-P = 4.48 V
CH1 RMS = 284 mV
26 27
Содержание CHA4217L
Страница 2: ...Samsung Electronics Co Ltd August 1998 Printed in Korea Code No BH68 61127A ...
Страница 10: ...Memo 3 Product Specifications 3 4 CHA42 7L 5 7L ...
Страница 14: ...5 Disassembly and Reassembly 5 2 CHA42 7L 5 7L Memo ...
Страница 62: ...9 Electrical Parts List 9 14 CHA42 7L 5 7L Memo ...
Страница 64: ...Memo 10 Block Diagrams 10 2 CHA42 7L 5 7L ...