
PhotoPC600
Chapter5 Adjustment
Rev. A
5-13
5.1.9 LCD Blue Brightness Adjustment
Blue brightness adjustment is white balance adjustment for blue color. This adjustment is to adjust
waveform of blue signal to voltage width (4.0 V) of TP172, which is performed at LCD Gain
adjustment.
CAUTION
Perform section 5.1.8 “LCD Gain Adjustment” before performing this
adjustment.
Step1.
Use the Ch2 of oscilloscope, and solder an extended cable to TP174 so that you
can check waveform by the oscilloscope. (Same shape of waveform as figure5-12)
Step2.
Turn VR178 and adjust until TP174 waveform becomes VG
±
0.2V, comparing with
VG(4.0Vp-p) of TP172 waveform.
T P 1 7 5
T P 1 7 2
T P 1 7 3
T P 1 7 1
T P 1 7 4
T P 1 7 2
T P 1 7 4
V G
T P 1 7 2 W a v e f o r m
T P 1 7 4 W a v e f o r m
R G B S i g n a l
R G B S i g n a l
V G +
0 . 2 V
LC
4105
7
AA3
4
433
KSS
7C
T
LV
41
20
7
B
U
7
V R 1 7 7
V R 1 7 1
V R 1 7 8
V R 1 7 8
C A 2 B o a r d
Figure 5-15. TP174, VR178 and TP174 waveform
Содержание PhotoPC600
Страница 1: ...SERVICE MANUAL Color Still Digital Camera EPSON PhotoPC600 4008224 ...
Страница 5: ...REVISION STATUS Rev Date Page s Contents A 1997 08 12 All First release ...
Страница 9: ...PRODUCT DESCRIPTION C H A P T E R 1 ...
Страница 36: ...PhotoPC600 Chapter 1 Product Description Rev A 1 27 ...
Страница 37: ...OPERATING PRINCIPLES C H A P T E R 2 ...
Страница 43: ...TROUBLESHOOTING C H A P T E R 3 ...
Страница 49: ...DISASSEMBLY AND ASSEMBLY C H A P T E R 4 ...
Страница 93: ...ADJUSTMENT C H A P T E R 5 ...
Страница 108: ...MAINTENANCE C H A P T E R 6 ...
Страница 110: ...APPENDIX C H A P T E R 7 ...