Circuit Adjustments - Canon LV-S4 Service Manual

Electrical Adjustments
● Circuit Adjustments
CAUTION: The each circuit has been made by the fine adjustment at factory. Do not attempt to adjust the follow-
ing adjustments except requiring the readjustments in servicing otherwise it may cause loss of per-
formance and product safety.
[Adjustment Condition]
● Input signal
Video signal .......................... 1.0Vp-p/75Ω terminated, 16 steps gray
Computer signal .................... 0.7Vp-p/75Ω terminated, 16 steps gray
Component Video signal........ 0.7Vp-p/75Ω terminated, 16 steps gray
● Picture control mode ................ "STANDARD" mode unless otherwise
Note:
* Please refer to "Service Adjustment Menu Operation" for entering to the service mode and adjusting the service
data.
* Please carry out the adjustments at TPG1/B1/R1 in order as G - B - R.
z
PC Pedestal adjustment
1. Receive the 16-step gray scale computer signal with
COMPUTER IN [RGB] mode.
2. Enter the service mode.
3. Connect an oscilloscope to test point "
chassis ground (-).
203
4. Select item no. " " and change data value to adjust
the pedestal level and black level to be the same
level.
5. Connect an oscilloscope to test point "
chassis ground (-).
204
6. Select item no. " " and change data value to adjust
the pedestal level and black level to be the same
level.
7. Connect an oscilloscope to test point "
chassis ground (-).
205
8. Select item no. " " and change data value to adjust
the pedestal level and black level to be the same
level.
* Following information differs from the model LV-S3 ;
scale, white 100% and white 50% pat-
tern (Composite video signal)
scale pattern (SVGA)
scale, white 100% and black 0% pat-
tern (480i format and 480p format)
noted.
x
1. Receive the 16-step gray scale computer signal with
2. Enter the service mode.
TPG1
" (+) and 3. Connect an oscilloscope to test point "
4. Select item no. "
5. Connect an oscilloscope to test point "
TPR1
" (+) and
6. Select item no. "
7. Connect an oscilloscope to test point "
TPB1
" (+) and 8. Select item no. "
-27-
- the electrical adjustments on page 27 -29
16 steps gray scale pattern
White 100%
PC Gain adjustment
COMPUTER IN [RGB] mode.
chassis ground (-).
7
" and change data value to adjust
waveform "a" to be minimum amplitude.
chassis ground (-).
8
" and change data value to adjust
waveform "a" to be minimum amplitude.
chassis ground (-).
9
" and change data value to adjust
waveform "a" to be minimum amplitude.
White Level
(a)
Black 100%
TPG1
" (+) and
TPR1
" (+) and
TPB1
" (+) and