Circuit Adjustments - Sanyo PLC-XW55A 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 following
adjustments except requiring the readjustments in servicing otherwise it may cause loss of performance
and product safety.
WArNING : uSe uV rAdIAtIoN eYe ANd SKIN
cAutIoN:
to prevent suffer of uV radiation, those adjustments
must be completed within 25 minutes.
[Adjustment Condition]
● Input signal
Video signal ....................... 1.0Vp-p/75W terminated, 16 steps gray scale
Computer signal ................... 0.7Vp-p/75W terminated, 16 steps gray scale
Component Video signal ...... 0.7Vp-p/75W terminated, 16 steps gray scale
● Picture control mode ........ "STANDARD" mode unless otherwise not-
Note:
* Please refer to "Service Adjustment Menu Operation" for entering the service mode and adjusting the service data.
Output Voltage adjustment
After replacing the Power Board readjust the Output volt-
age adjustment as follows.
1. Connect a digital voltmeter to pins 1 (+) and 3 (-) of
K6d
.
. Adjust the voltage by using VR611 as following.
AC Input Reading
30V 380V ±V
Caution:
Be sure to connect the lamp when taking this adjustment.
* This adjustment is not required even if the power board
is replaced because this adjustment is carried out be-
fore parts shipment.
ProtectIoN durING SerVIcING.
(Composite video signal)
pattern
(Component video signal with 480p, 575p,
70p or 1080i format)
ed.
16 steps gray scale pattern
White 100%
z Panel Type Check and Setting
* Before setting, you need to check which type of LCD pan-
el is placed on the projector according to the item "LCD
Panel/Prism Ass'y removal" in the chapter "Optical Parts
Disassembly".
1. Enter the service mode.
. Panel Type Check
290
Select group no. "
value as follows;
Data value: 0
Data value: 0 For R-Type of LCD panel
3. Panel Type Setting
290
Select group no. "
value from 10 to 0 or 0 depending on your LCD Panel
type. When the data value reaches 0 or 0, it returns
to 10 quickly. The gamma-characteristics changes ac-
cording to your selection.
-5-
Black 100%
0
", item no. " ". Check the data
For L-Type of LCD Panel
1
", item no. " " and change data