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2.3 Video Gain Adjustment
1. Receive the 16-step gray scale composite video signal with
Video [Video]
mode.
2. Enter the service mode.
3. Connect an oscilloscope to test point “
TPR1
” (+) and chassis ground (–).
4. Select item no. “
7
” and change data value to adjust waveform “
a
” to be minimum
amplitude.
5. Connect an oscilloscope to test point “
TPG1
” (+) and chassis ground (–).
6. Select item no. “
8
” and change data value to adjust waveform “
a
” to be minimum
amplitude.
7. Connect an oscilloscope to test point “
TPB1
” (+) and chassis ground (–).
8. Select item no. “
9
” and change data value to adjust waveform “
a
” to be minimum
amplitude.
Fig. 3-5
2.4 480p Pedestal Adjustment
1. Receive the 16-step gray scale component signal (
480p
format) with
COMPUTER IN
[COMPONENT]
mode.
2. Enter the service mode.
3. Connect an oscilloscope to test point “
TPG1
” (+) and chassis ground (–).
4. Select item no. “
276
” and change data value to adjust the pedestal level and black
level to be the same level.
5. Connect an oscilloscope to test point “
TPR1
” (+) and chassis ground (–).
6. Select item no. “
275
” and change data value to adjust the pedestal level and black
level to be the same level.
7. Connect an oscilloscope to test point “
TPB1
” (+) and chassis ground (–).
8. Select item no. “
277
” and change data value to adjust the pedestal level and black
level to be the same level.
Fig. 3-6
Blac
k Lebel
P
edestal Lebel
(a)
White Level
Part 3: Adjustment
3-9
Summary of Contents for LV-S3E/D78-5423
Page 2: ...CANON Multimedia Projector LV S3U D78 5422 LV S3E D78 5423 SERVICE SMANUAL ...
Page 9: ...Part 1 General Information ...
Page 24: ...Part 2 Repair Information ...
Page 42: ...Part 3 Adjustment ...
Page 59: ...Part 4 Troubleshooting ...
Page 73: ...Part 4 Troubleshooting 4 14 BA7078AF Sync Detector IC5301 BA9743AFV DC DC Converter IC371 ...
Page 74: ...Part 4 Troubleshooting 4 15 LM4865 Audio Amplifier IC5003 PW168A Scaler Main CPU IC301 ...
Page 76: ...Part 5 Parts Catalog ...
Page 77: ......
Page 93: ...Part 6 Electrical Diagrams ...