6 Troubleshooting
6-6 No Video
WAVEFORMS
Power indicator is green
A 4.56 V (IC101 #15,19,22)
Does DC 12 V appear at No
Check DC 12 V line D614 and IC603.
Pin 6 of IC101?
CH1 P-P = 4.56 V CH1 RMS = 3.804 V
YesB 52.0 V (IC102 #1,3,5)
Does the video pulses
No
CCheck signal cable
30appear at Pins 5, 7 and 9
and signal source
of IC101 on the Video Board?
YesCH1 P-P = 52.0 V CH1 RMS = 46.16 V
Does the video pulse Check IC202 (pin
NoDoes the clamp signal No
Aappear at Pins 14, 16 and D#16) on the main
appear at Pin 12 of IC101?
19 of IC101?Board.
YesYes
C 720 mV (IC101 Pin #2,4,6)
Does the video amplified
NoDoes the H-BLK No
Bpulse appear at
appear at Pin 13 of IC101?
Pins 1, 3 and 5 of IC102?
YesYes
CH1 P-P = 720m V CH1 RMS = 2.602 V
Check contrast circuit
Replace the IC102D 5.5 V (IC101 Pin #23)
on the main Board
(Q507 and Q511).
Check DC 75 V at Pin 6 of IC102.
CH1 P-P = 5.5 V CH1 RMS = 1.084 V
CKB5237L/7227L6-5 |
ACEC
OTHERS
