Sharp AN-S422E, Service Manual

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XG-V10WE
AN-SD1E/S422E
No. Adjusting point Adjusting conditions Adjusting procedure
4 RGB2 system
black level
signal amplitude
adjustment
»
Select R2-GAIN. Adjust the setting so that the
signal component has the minimum amplitude. 1. Select the following group
and subjects.
Group : OUTPUT2
Subject : R2-GAIN
R2-BLK
For the G and B colours,
choose the following re-
spective subjects.
G2-GAIN and G2-BLK for G
B2-GAIN and B2-BLK for B
2. Connect the oscilloscope to
pin (2) (for R) of P1001.
3. Similarly connect the oscil-
loscope to the following for
the G and B colours.
Pin (4) of P1001 for G
Pin (6) of P1001 for B
»
Select R2-BLK. Adjust the setting so that the wave-
form becomes a straight horizontal line.
Adjusted to
5 Sample hold
pulse phase
checking
»
Using the set's control switch or the remote
controller’s button, make sure the characters
OUTPUT3 are not blurry with no ghost image on
the screen. If anything blurry or a ghost image
appears onscreen, readjust the setting in the
range of 7-9. 1. Feed the SXGA-mode, 75-
Hz black signal.
2. Select the following group
and subject.
Group : OUTPUT3
Subject : SH-PHASE
6 RGB
countervoltage
adjustment
»
Using the set's control switch or the remote
controller’s button, adjust the setting so that the
flickering be minimum.
»
If there is a difference between the center and
both sides on the screen, adjust the setting to get
both sides equal to each other.
1. Feed the SXGA-mode, 60-
Hz, countervoltage adjust-
ment signal.
2. Select the following group
and subjects.
Group : OUTPUT3
Subject : RC (R)
GC (G)
BC (B)
7 RGB tone
reproduction
adjustment
»
Make sure the grayscale, shown below, is visible
up to the tone 251 (white) as well as down to the
tone 8 (black).
»
If the white tone is out of spec, finely adjust the
G1-BLK setting.
1. Feed the Infocom
Grayscale & Colour
Pattern signal.
2. Select the following group
and subject.
Group : OUTPUT1
Subject : G1-BLK
4 8 12
249 251