Eiki LC-X71 LC-X71L c Fan Voltage adjustment, b PSIG adjustment, v Video Center adjustment

Electrical Adjustments

cFan Voltage adjustment

1.Enter the service mode.

2.Connect a digital multimeter to test point “A” (+) and chassis ground (-). (as shown below)

3.Select group no. “140”, item no. “B” and change data value to adjust the fan max. output voltage to be 13.5 ±0.05V.

4.Select group no. “140”, item no. “C” and change data value to adjust the fan min. output voltage to be 5.0 ±0.05V.

5.Each fan should be adjusted refer to item 2 - 4.

Note:

The location of each fan is refer to "FAN control stage" of Chassis Description.

Test point "A"	Item No."B"		Item No."C"	Fan No.
TPFN3	0	1		FN903
TPFN7	2	3		FN907
TPFN6	4	5		FN906
TPFN4	6	7		FN904
FAN1	8	9		FN901
				FN902
FAN2	10	11		FN905

bPSIG adjustment

1.Receive the 16-step gray scale computer signal with Input 1 [RGB(Analog)] mode.

2.Enter the service mode.

3.Connect an oscilloscope to test point “TP533” (+) and chassis ground (-).

4.Select group no. “200”, item no. “3” and change data value to adjust amplitude “a” to be 10.8 ±0.1V.

5.Select item no. “6” and change data value to adjust amplitude “b” to be 3.8 ±0.1V.

6.Connect an oscilloscope to test point “TP563” (+).

7.Select group no. “200”, item no. “4” and change data value to adjust amplitude “a” to be 10.8 ±0.1V.

8.Select item no. “7” and change data value to adjust amplitude “b” to be 3.8 ±0.1V.

9.Connect an oscilloscope to test point “TP503” (+) .

10.Select group no. “200”, item no. “5” and change data value to adjust amplitude “a” to be 10.8 ±0.1V.

11.Select item no. “8” and change data value to adjust amplitude “b” to be 3.8 ±0.1V.

(b) (a)

vVideo Center adjustment

1.Receive the 16-step gray scale computer signal with Input 1 [RGB(Analog)] mode.

2.Enter the service mode.

3.Connect a digital voltmeter to test point “TP531” (+) and chassis ground (-).

4.Select group no. “200”, item no. “0” and change data value to adjust the voltage to be 7.5 ±0.05Vdc.

5.Connect a digital voltmeter to test point “TP561” (+) and chassis ground (-).

6.Select item no. “1” and change data value to adjust the voltage to be 7.5 ±0.05Vdc.

7.Connect a digital voltmeter to test point “TP501” (+) and chassis ground (-).

8.Select item no. “2” and change data value to adjust the voltage to be 7.5 ±0.05Vdc.

nPC Black Level adjustment

1.Receive the 16-step gray scale computer signal with Input 1 [RGB(Analog)] mode.

2.Enter the service mode.

3.Connect an oscilloscope to test point “TP531” (+) and chassis ground (-).

4.Select group no. “200”, item no. “9” and change data value to adjust amplitude “a” to be 10.6 ±0.1V.

5.Connect an oscilloscope to test point “TP561” (+) and chassis ground (-).

4.Select group no. “200”, item no. “10” and change data value to adjust amplitude “a” to be 10.6 ±0.1V.

3.Connect an oscilloscope to test point “TP501” (+) and chassis ground (-).

4.Select group no. “200”, item no. “11” and change data value to adjust amplitude “a” to be 10.6 ±0.1V.

black level

(a)

black level

- 26 -