DOWNLOAD Sharp XG-P20XE (serv.man4) Service Manual ↓ Size: 1.38 MB | Pages: 35 in PDF or view online for FREE

Model
XG-P20XE (serv.man4)
Pages
35
Size
1.38 MB
Type
PDF
Document
Service Manual
Brand
Device
Projector / Service Manual Part 1 - Text - p1-35
File
xg-p20xe-sm4.pdf
Date

Sharp XG-P20XE (serv.man4) Service Manual ▷ View online

29
XG-P20XU
XG-P20XE
XG-P20XD
7
Sample-and-
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.
»
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.
8
RGB counter-
voltage
adjustment
1. Feed the black-and-red
(25%) stripe signal (XGA).
2. Make the following choice:
Group : OUTPUT 3
Subject : RC (R)
: BC (B)
: GC (G)
»
Using the control switches or the remote controller
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.
9
RGB gradation
regeneration
adjustment
1. Feed the INFO COM. gray
scale and color bar pattern.
2. Make the following choice:
Group : OUTPUT 1
Subject : G1-BLK
»
Make sure that scale (white side) to No.251 and
scale (black side) to No.8 can be seen.
»
If white scale can't be seen properly, readjust with
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
: 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.
2.5V DC
5.0V DC
GND
PSIG
(Adjust with PSIG-L.)
(Adjust with PSIG-H.)  
30
XG-P20XU
XG-P20XE
XG-P20XD
No.
Adjusting point
Adjusting conditions
Adjusting procedure
10
RGB white
balance
1. Feed the 32-step gray scale
signal (XGA 60Hz).
Group : OUTPUT 1
Subject : R1-BLK (R)
R1-GAIN(R)
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.)
11
Horizontal
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.
13
Video picture
adjustment
1. Feed the split color bar sig-
nal.
Group : VIDEO 1
Subject : PICTURE
2. Connect the oscilloscope
between pin TP1201and
GND.
»
Using the control switches or the remote controller
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
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.
12
Video
brightness
adjustment
1. Feed the baseband (0 step
gray scale :0% Black to
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).
»
Using the control switches or the remote controller
buttons, adjust the setting until the black signal (0%)
becomes bit-less.
SAME LEVEL
31
XG-P20XU
XG-P20XE
XG-P20XD
No.
Adjusting point
Adjusting conditions
Adjusting procedure
100% White Red
15
NTSC color
saturation level
1. Feed the split color bar sig-
nal.
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 
±
0.02 Vp-p.
   (same as 100% white)
16
PAL color
saturation level
1. Feed the PAL color bar sig-
nal.
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 
±
0.02 Vp-p.
100% White Red
17
SECAM color
saturation level
1. Feed the SECAM color bar
signal.
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 
±
0.02 Vp-p between the 100% white portion
and the red portion.
18
Video white
balance
1. Feed the NTSC mono-
scope pattern signal
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.
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.
2. Select the following subject.
Group : DVD
Subject : CONTRAST
»
Using the control switches or the remote controller
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
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.
2. Select the following subject.
Group : DVD
Subject : CONTRAST
»
Using the control switches or the remote controller
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.
2. Select the following subject.
Group : DVD
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.
2. Select the following subject.
 Group : DVD
Subject : COLOR
3. Connect the oscilloscope to
TP1101.
»
Adjust the level difference between the 100% white
and red portions to 0.3 
±
0.02 Vp-p.
100% White Red
23
DVD White
balance
adjuustment
1. Feed the NTSC mono-
scope signal to G(Y) input
terminal of the BNC termi-
nal.
2. Select the following subject.
Group : DVD
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.
24
Checking and
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
»
Make sure that a white balance is the best condi-
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.
SAME LEVEL
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