Eiki LC-X71 Service Manual download pdf (Page 26)

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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.

v Video Center adjustment

Electrical Adjustments

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.

(a)

(b)

b PSIG 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.

(a)

black level

n PC Black Level 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.

c Fan Voltage adjustment

Test point "A" Item No."B"

TPFN3 0

TPFN7 2

TPFN6 4

TPFN4 6

FAN1 8

FAN2 10

Item No."C"Fan No.

1 FN903

3 FN907

5 FN906

7 FN904

9 FN901

FN902

11 FN905

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 106 107

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Eiki LC-X71 Service Manual Page 26

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