Sharp XG-P20XE (serv.man4) Service Manual ▷ View online
29
XG-P20XU
XG-P20XE
XG-P20XD
XG-P20XE
XG-P20XD
7
Sample-and-
hold pulse
phase
RCK-PHASE
GCK-PHASE
BCK-PHASE
hold pulse
phase
RCK-PHASE
GCK-PHASE
BCK-PHASE
1. Feed the XGA mode 75-Hz
black signal.
2. Make the following choice:
Group : OUTPUT 3
Subject : SH-PHASE
(Have the standard level at
8.)
Fix the GCK-PHASE set-
tings all to 8.
Subject : SH-PHASE
(Have the standard level at
8.)
Fix the GCK-PHASE set-
tings all to 8.
»
Using the control switches or the remote controller
buttons, make sure that the “OUTPUT 3” charac-
ters are not blurry and there is no ghost image. If
such blur or ghost occurs, finely adjust the setting
in the range of 7~9.
buttons, make sure that the “OUTPUT 3” charac-
ters are not blurry and there is no ghost image. If
such blur or ghost occurs, finely adjust the setting
in the range of 7~9.
8
RGB counter-
voltage
adjustment
voltage
adjustment
1. Feed the black-and-red
(25%) stripe signal (XGA).
2. Make the following choice:
Group : OUTPUT 3
Subject : RC (R)
Subject : RC (R)
: BC (B)
: GC (G)
: GC (G)
»
Using the control switches or the remote controller
buttons, adjust the data in order to minimize the
flicker.
buttons, adjust the data in order to minimize the
flicker.
»
Make the same adjustment for BC (B) and GC (G).
»
See if the image is equally adjusted at the center
and both sides of the screen. If not, readjust the
setting to have the image equal at right and left.
and both sides of the screen. If not, readjust the
setting to have the image equal at right and left.
9
RGB gradation
regeneration
adjustment
regeneration
adjustment
1. Feed the INFO COM. gray
scale and color bar pattern.
2. Make the following choice:
Group : OUTPUT 1
Subject : G1-BLK
Subject : G1-BLK
»
Make sure that scale (white side) to No.251 and
scale (black side) to No.8 can be seen.
scale (black side) to No.8 can be seen.
»
If white scale can't be seen properly, readjust with
G1-BLK.
G1-BLK.
4
8
12
249 251
No.
Adjusting point
Adjusting conditions
Adjusting procedure
6
P SIGNAL
1. Connect the oscilloscope to
TP1102 for red.
2. Make the following choice:
Group : OUTPUT 2
Subject : PSIG-H
Subject : PSIG-H
: PSIG-L
»
Adjust the PSIG waveform to the one shown below.
»
For the green and blue colors, make sure their wave-
forms are similar to that of the red color.
forms are similar to that of the red color.
2.5V DC
5.0V DC
GND
PSIG
(Adjust with PSIG-L.)
(Adjust with PSIG-H.)
30
XG-P20XU
XG-P20XE
XG-P20XD
XG-P20XE
XG-P20XD
No.
Adjusting point
Adjusting conditions
Adjusting procedure
10
RGB white
balance
balance
1. Feed the 32-step gray scale
signal (XGA 60Hz).
Group : OUTPUT 1
Subject : R1-BLK (R)
Group : OUTPUT 1
Subject : R1-BLK (R)
R1-GAIN(R)
B1-BLK (B)
B1-GAIN(B)
B1-BLK (B)
B1-GAIN(B)
»
Adjust the R1-BLK and B1-BLK data for the black
balance on the gray scale. Then adjust the R1-
GAIN and B1-GAIN data for the center-to-white
balance on the gray scale.
(Adjust to the best point.)
balance on the gray scale. Then adjust the R1-
GAIN and B1-GAIN data for the center-to-white
balance on the gray scale.
(Adjust to the best point.)
11
Horizontal
center
center
1. Feed the NTSC mono-
scope pattern signal.
2. Group : VIDEO 1
Subject : NTSC-H
»
Using the control switches or the remote controller
buttons, adjust the data to have the same
overscan.
buttons, adjust the data to have the same
overscan.
13
Video picture
adjustment
adjustment
1. Feed the split color bar sig-
nal.
Group : VIDEO 1
Subject : PICTURE
Group : VIDEO 1
Subject : PICTURE
2. Connect the oscilloscope
between pin TP1201and
GND.
GND.
»
Using the control switches or the remote controller
buttons, adjust the white to white (100%) level
difference to 2.2
buttons, adjust the white to white (100%) level
difference to 2.2
±
0.05 Vp-p.
2.2Vp-p
14
Tint
1. Feed the split color bar sig-
nal.
Group : VIDEO 1
Subject : TINT
Group : VIDEO 1
Subject : TINT
2. Connect the oscilloscope to
TP1301.
»
Using the control switches or the remote controller
buttons. Adjust the setting so that the points indi-
cated in the waveform figure are at the same level.
buttons. Adjust the setting so that the points indi-
cated in the waveform figure are at the same level.
12
Video
brightness
adjustment
brightness
adjustment
1. Feed the baseband (0 step
gray scale :0% Black to
100% White) signal.
Group : VIDEO 1
Subject : BRIGHT
100% White) signal.
Group : VIDEO 1
Subject : BRIGHT
2. Press the control switch or
the remote control’s mute
button (to set the gamma
correction to the process
setting).
button (to set the gamma
correction to the process
setting).
»
Using the control switches or the remote controller
buttons, adjust the setting until the black signal (0%)
becomes bit-less.
buttons, adjust the setting until the black signal (0%)
becomes bit-less.
SAME LEVEL
31
XG-P20XU
XG-P20XE
XG-P20XD
XG-P20XE
XG-P20XD
No.
Adjusting point
Adjusting conditions
Adjusting procedure
100% White Red
15
NTSC color
saturation level
saturation level
1. Feed the split color bar sig-
nal.
Group : VIDEO 1
Subject : N-COLOR
Group : VIDEO 1
Subject : N-COLOR
2. Connect the oscilloscope to
TP1101.
»
Using the control switches or the remote controller
buttons, adjust the difference between the 100%
white portion and the red portion to 0.25
buttons, adjust the difference between the 100%
white portion and the red portion to 0.25
±
0.02 Vp-p.
(same as 100% white)
16
PAL color
saturation level
saturation level
1. Feed the PAL color bar sig-
nal.
Group : VIDEO 1
Subject : P-COLOR
Group : VIDEO 1
Subject : P-COLOR
2. Connect the oscilloscope to
TP1101.
»
Using the control switches or the remote controller
buttons, adjust the difference between the 100%
white portion and the red portion to 0.3
buttons, adjust the difference between the 100%
white portion and the red portion to 0.3
±
0.02 Vp-p.
100% White Red
17
SECAM color
saturation level
saturation level
1. Feed the SECAM color bar
signal.
Group : VIDEO 1
Subject : S-COLOR
Group : VIDEO 1
Subject : S-COLOR
2. Connect the oscilloscope to
TP1101.
»
Using the control switches or the remote controller
buttons, adjust the data to have a level difference
of 0.3
buttons, adjust the data to have a level difference
of 0.3
±
0.02 Vp-p between the 100% white portion
and the red portion.
18
Video white
balance
balance
1. Feed the NTSC mono-
scope pattern signal
Group : VIDEO 2
Subject : R1-BLK
Group : VIDEO 2
Subject : R1-BLK
B1-BLK
»
Using the control switches or the remote controller
buttons, adjust so that the entire screen looks
evenly colorless.
buttons, adjust so that the entire screen looks
evenly colorless.
100% White Red
19
DVD Contrast
1. Feed the color bar signal of
the 480I component signal
to the BNC G(Y) input ter-
minal.
to the BNC G(Y) input ter-
minal.
2. Select the following subject.
Group : DVD
Subject : CONTRAST
Subject : CONTRAST
»
Using the control switches or the remote controller
buttons, adjust the white to white (100%) level
difference to 2.2
buttons, adjust the white to white (100%) level
difference to 2.2
±
0.05v p-p.
2.2Vp-p
32
XG-P20XU
XG-P20XE
XG-P20XD
XG-P20XE
XG-P20XD
No.
Adjusting point
Adjusting conditions
Adjusting procedure
20
DVD Brighthess
1. Feed the color bar signal of
the 480I component signal
to the BNC G(Y) input ter-
minal.
to the BNC G(Y) input ter-
minal.
2. Select the following subject.
Group : DVD
Subject : CONTRAST
Subject : CONTRAST
»
Using the control switches or the remote controller
buttons, adjust the setting until the black sig-
nal(0%) becomes bit-less.
buttons, adjust the setting until the black sig-
nal(0%) becomes bit-less.
21
DVD Tint
1. Feed the color bar signal of
the 480I component signal
to the BNC Y, Pb and Pr in-
put terminals. Feed the
sync signal only for the Y
signal.
to the BNC Y, Pb and Pr in-
put terminals. Feed the
sync signal only for the Y
signal.
2. Select the following subject.
Group : DVD
Subject : TINT
Subject : TINT
3. Connect the oscilloscope to
TP1301.
22
DVD Color
1. Feed the color bar signal of
the 480I component signal
to the BNC G(Y) input ter-
minal.
to the BNC G(Y) input ter-
minal.
2. Select the following subject.
Group : DVD
Subject : COLOR
Subject : COLOR
3. Connect the oscilloscope to
TP1101.
»
Adjust the level difference between the 100% white
and red portions to 0.3
and red portions to 0.3
±
0.02 Vp-p.
100% White Red
23
DVD White
balance
adjuustment
balance
adjuustment
1. Feed the NTSC mono-
scope signal to G(Y) input
terminal of the BNC termi-
nal.
terminal of the BNC termi-
nal.
2. Select the following subject.
Group : DVD
Subject : R1-BLK
Subject : R1-BLK
B1-BLK
»
Adjust so that a white balance may become the best
condition by using the control switch or buttons of
the R/C.
condition by using the control switch or buttons of
the R/C.
24
Checking and
readjustment of
white balance
readjustment of
white balance
1.The adjustment condition of
each item is as mentioned
in the following.
RGB input:Refer to No.11
VIDEO input:Refer to No.19
DVD input:Refer to No.23
in the following.
RGB input:Refer to No.11
VIDEO input:Refer to No.19
DVD input:Refer to No.23
»
Make sure that a white balance is the best condi-
tion.
tion.
»
Using the control switches or the remote controller
buttons. Adjust the setting so that the points indi-
cated in the waveform figure are at the same level.
buttons. Adjust the setting so that the points indi-
cated in the waveform figure are at the same level.
SAME LEVEL
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