Eiki LC-XB42, Service Manual

Page: 27 / 110

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Electrical Adjustments
[Adjustment Condition]
●
Input signal
Video signal ........................ 1.0Vp-p/75 W terminated, 16 steps gray scale
(Composite video signal)
Component Video signal ...... 1.0Vp-p/75 W terminated, 8 color 100% color
bar or 16 step gray scale (Component video
signal)
Computer signal ................... 0.7Vp-p/75 W terminated, 16 steps gray scale
pattern
●
Image control mode ......... “STANDARD” mode unless otherwise noted.
Note:
* Please refer to “Service Adjustment Menu Operation” for entering the service mode and adjusting the service data.
White 100%
Black 100%
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. Before adjustment, please turn on the projector more than ten minutes.
16 steps gray scale pattern
After replacing the Power Board readjust the Output volt-
age adjustment as follows.
1. Connect a digital voltmeter to pins 1 (+) and 2 (-) of
K6A
.
2. Adjust the voltage by using VR601 as following.
AC Input Reading
230V 370V ±2V
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.
Output Voltage adjustment
WArNING : uSe uV rAdIAtION eYe ANd SKIN
PrOteCtION durING SerVICING.
CAutION:
to prevent suffer of uV radiation, those adjustments
must be completed within 25 minutes.
1. Enter the service mode.
2. Connect a digital voltmeter to test point “
tPFANA
” (+)
and chassis ground (-). Select group no. “
250
”, item
no. “
0
” and change data value to adjust voltage to be
5.0 ±0.1V
.
3. Connect a digital voltmeter to test point “
tPFANB
” (+)
and chassis ground (-). Select group no. “
250
”,item
no. “
2
” and change data value to adjust voltage to be
5.0 ±0.1V
.
4. Connect a digital voltmeter to test point “
tPFANC
” (+)
and chassis ground (-). Select group no. “
250
”,item
no. “
4
” and change data value to adjust voltage to be
5.0 ±0.1V
.
5. Connect a digital voltmeter to test point “
tPFANA
” (+)
and chassis ground (-). Select group no. “
250
”,item
no. “
1
” and change data value to adjust voltage to be
13.5 ±0.1V
.
6. Connect a digital voltmeter to test point “
tPFANB
” (+)
and chassis ground (-). Select group no. “
250
”,item
no. “
3
” and change data value to adjust voltage to be
13.5 ±0.1V
.
7. Connect a digital voltmeter to test point “
tPFANC
” (+)
and chassis ground (-). Select group no. “
250
”,item
no. “
5
” and change data value to adjust voltage to be
13.5 ±0.1V
.
z
Fan Control adjustment