Canon D78-5382, Service Manual

Page: 69 / 126

From previous
page
Part 4: Troubleshooting
4-4
Check AV source selecting stage;
Check S-video signal (Y/C) on the AV board.
Check IC2101, Video/S-Video-sw, and IC3101, Video
decoder, and peripheral circuit.
S/CV-SW signal (S-Video:H) is applied on pins 2, 7 and
12 of IC2101, output from pin 17 of IC1804.
No picture with S-VIDEO
input source
Check AV source selecting stage;
Check component signal (Y/Cr,Pr/Cb,Pb) on the AV
board.
Check IC5201, PC/AV RGB SW, and IC8201, A/D
conversion and peripheral circuit.
Check IC2101, Video/S-Video-sw, and IC3101, Video
decoder, and peripheral circuit.
PC/AV_SW5 signal (PC: H) is applied on pin 26 of
IC5201, output from pin 16 of IC1804 through IC1351,
buffer IC.
No picture with
Component input source
Check AV source selecting stage;
Check composite video signal (Video) on the AV board.
Check IC2101, Video/S-Video-sw, and IC3101, Video
decoder, and peripheral circuit.
S/CV-SW signal (Video:L) is applied on pins 2, 7 and 12
of IC2101, output from pin 17 of IC1804.
Check IC2101, Video/S-Video-sw, and IC3101, Video
decoder, and peripheral circuit.
PC/AV_SW5 signal (PC: H) is applied on pin 26 of
IC5201, output from pin 16 of IC1804 through IC1351,
buffer IC.
No picture with video
input source
No
Yes
Yes
Yes
No
Check PC/AV source selecting stage and processing stage;
Check IC5201, PC/AV RGB SW, and IC8201, A/D
conversion and peripheral circuit.
Check IC5321, IC5331, PC/AV Sync selection IC, and
peripheral circuit.
PC/AV_SW5 signal (PC: H) is applied on pin 26 of
IC5201, pin 2 of IC5321, and pin 10 of IC5331, and
output from pin 16 of IC1804 through IC1351, buffer IC.
No picture with all of
computer input sources
Yes
No