Eiki LC-W3, Service Manual

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[Adjustment Condition]
●
Input signal
Video signal .......................... 1.0Vp-p/75
Ω
terminated, 16 steps gray
scale, white 100% and black 0% pat-
tern (Composite video signal)
Computer signal .................... 0.7Vp-p/75
Ω
terminated, 16 steps gray
scale pattern (WXGA)
Component Video signal ....... 0.7Vp-p/75
Ω
terminated, 16 steps gray
scale, white 100% and black 0% pat-
tern (480i format)
RGB Video signal .................. 0.7Vp-p/75
Ω
terminated, 16 steps gray
scale, white 100% and black 0% pat-
tern (480p format)
●
Picture control mode ............... “STANDARD” mode unless otherwise noted.
Note:
* Please refer to “Service Adjustment Menu Operation” for entering to the service mode and adjusting the service
data.
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 perfor-
mance and product safety.
Electrical Adjustments
White 100%
Black 100%
16 steps gray scale pattern
x
Fan Voltages adjustment
1. Enter the service mode.
2. Connect a digital voltmeter to test point
A
(+) and
chassis ground (-). (6 test points are provided for this
adjustment, perform all the voltage adjustments in
the table below.)
3. Select group no. “
140
”. Select item no.
B
and change
data value to adjust the voltage to be
C
±0.05V, and
select item no.
D
and change data value to adjust
the voltage to be
E
±0.05V.
4. Repeat step 2 to 3 for the remaining test points in
the table below.
After replacing the Power Board readjust the Output
voltage adjustment as follows.
1. Connect a digital voltmeter to pins 1 (+) and 3 (-) 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 adjust-
ment.
z
Output Voltage adjustment
* This adjustment is not required even if the power
board is replaced because this adjustment is carried
out before parts shipment.
Test Point A Item B Voltage C Item D Voltage E
TPFN3 0 14.0 1 6.5
TPFN7 2 14.0 3 5.0
TPFN6 4 14.0 5 5.0
TPFN4 6 14.0 7 5.0
FAN1 8 14.0 9 5.0
FAN2 10 14.0 11 5.0
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.