Eiki LC-X71 LC-X71L - Manual (Page 25)

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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.
Electrical Adjustments
[Adjustment Condition]
● Input signal
Video signal .......................... 1.0Vp-p/75Ω terminated, 16 steps gray
scale, white 100% and 50% pattern
(Composite video signal)
Computer signal .................... 0.7Vp-p/75Ω terminated, 16 steps gray
scale, 1 line dot, 100% and 50% pat-
tern (XGA)
Component Video signal........ 0.7Vp-p/75Ω terminated, 16 steps gray
scale (480i, 480p, 720p and1080i-60)
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.
White 100% Black 100%
After replacing the Power Board readjust the Output volt-
age adjustment as follows.
1. Connect a digital voltmeter to pin 1 (+) of K6A and
chassis ground (-).
2. Adjust the voltage by using VR601 on the power
board as following.
AC Input Reading
230V 370 ±2Vdc
120V 356 ±2Vdc
Caution:
Be sure to connect the lamp when taking this adjust-
ment.
z
Output Voltage adjustment
1. Receive the 16-step gray scale video signal with Input
3 [Video] mode.
2. Connect a digital voltmeter to pin 3 (+) of CN6A and
chassis ground (-).
3. Adjust the voltage to be 15.8 ±0.1Vdc by using
VR681 on the power board.
Note:
The Power Board for replacing is already adjusted in the
factory, so it is not required to perform readjustment of
item1 and 2.
x
+16V adjustment
16 steps gray scale pattern
WARNING : USE UV RADIATION EYE
AND SKIN PROTECTION
DURING SERVICING
CAUTION: To prevent suffer of UV radia-
tion, those adjustments must be
completed within 25 minutes.
Note:
The Power Board for replacing is already adjusted in the factory, so it is not required to perform readjustment of
item1 and 2.