G Circuit Adjustments - Toshiba TLP-X4100U Service Manual

Electrical Adjustments

G 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]
G 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
G 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.
Output Voltage adjustment
After replacing the Power Board readjust the Output
voltage adjustment as follows.
1. Connect a digital voltmeter to pin 1 (+) of
chassis ground (-).
2. Adjust the voltage by using
board as following.
AC Input
230V 370 ±2Vdc
or 120V 340 ±2Vdc
Caution:
Be sure to connect the lamp when taking this adjust-
ment.
+16V adjustment
1. Receive the 16-step gray scale video signal with
Input 3 [VIDEO] mode.
2. Connect a digital voltmeter to pin 3 (+) of
chassis ground (-).
3. Adjust the voltage to be
VR681
on the power board.
scale (Composite video signal)
scale pattern (XGA)
scale (Component video signal with
480p or 1080i format)
noted.
K6A
and
VR601
on the power
Reading
CN6A
15.8
±0.1Vdc by using
Video Center adjustment
1. Receive the 16-step gray scale computer signal with
Input 1 [COMPUTER] mode.
2. Enter the service mode.
3. Connect a digital voltmeter to test point "
and chassis ground (-).
4. Select group no. "
value to adjust the voltage to be
5. Connect a digital voltmeter to test point "
and chassis ground (-).
6. Select item no. "
the voltage to be
7. Connect a digital voltmeter to test point "
and chassis ground (-).
8. Select item no. "
the voltage to be
and
-23-
16 steps gray scale pattern
White 100%
5 1
", item no. " " and change data
7.50
±0.1Vdc.
0
" and change data value to adjust
7.50
±0.1Vdc.
2
" and change data value to adjust
7.50
±0.1Vdc.
Black 100%
TP531
" (+)
TP501
" (+)
TP561
" (+)