Eiki LC-XT4E, Service Manual

Page: 82 / 160

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Electrical Adjustments
Input mode Computer mode
Input signal 1 line dot computer signal
1. Enter the service mode.
2. Project only one color component to the screen.
3. Change data value to obtain
the minimum flicker for
each color on the screen.
Group No. Screen
200 - 15 Only green color picture
200 - 16 Only red color picture
200 - 17 Only blue color picture
⁄2
Common center adjustment
Equipment Oscilloscope
Input mode
Video mode
Input signal 16-step gray scale signal
1. Enter the service mode.
2. Change data values for the test points to adjust the
waveform “ a ” to be minimum amplitude.
Group No. Connection
210 - 9 TP531 (G)
210 - 10 TP501 (R)
210 - 11 TP561 (B)
(a)
White Level
.
Gain adjustment [AV]
Equipment Oscilloscope
Input mode
Component mode
Input signal 16-step gray scale, color bar signal
1. Enter the service mode.
2. Receive 16-step gray scale signal.
3. Change data value for the test point to adjust the wave-
form “ a ” to be maximum amplitude.
4. Receive color bar signal.
5. Change data values for the test points to adjust the
waveform “ b ” and “ c ” to be maximum amplitude.
Group No. Connection Adjustment points
210 - 9 TP531 (G) waveform (a) to maximum
210 - 10 TP501 (R) waveform (b) to maximum
210 - 11 TP561 (B) waveform (C) to maximum
(a)
White Level
(b)
(c)
G
R
B
⁄0
Gain adjustment [Component]
Equipment Oscilloscope
Input mode
Computer mode
Input signal 16-step gray scale signal
1. Enter the service mode.
2. Change data values for each test point to adjust the
waveform “ a ” to be below value.
Group No. Connection Adjustment value
200 - 12 TP531 (G)
10.0
±0.05V
200 - 13 TP501 (R)
10.0
±0.05V
200 - 14 TP561 (B)
10.0
±0.05V
(a)
black level
black level
⁄1
Black level adjustment [PC]