XG-C50XE (serv.man10). Electrical adjustment — Sharp Projector Service Manual (repair manual)

Model
XG-C50XE (serv.man10)
Pages
9
Size
26.77 KB
Type
PDF
Document
Service Manual
Brand
Device
Projector / Electrical adjustment
File
xg-c50xe-sm10.pdf
Date

View Sharp XG-C50XE (serv.man10) Service Manual online

20
XG-C50X
ELECTRICAL ADJUSTMENT
1
Initialization of
EEPROM
1. Turn on the power (the lamp lights
up) and warm up the system for 15
minutes.
No.
Adjustment Items
Adjustment Conditions
Adjustment Procedures
1. Make the following settings.
Press S2601 to enter the process
mode, and execute S2 on the SSS
menu. Now the EEPROM, except for
the PC I/F unit, is initialized.
Do not execute S1, or the PC I/F unit
itself will be initialized.
(The PC I/F unit has been factory-
adjusted.)
To adjust the PC I/F unit, refer to "How
to Adjust the PC I/F unit" on the last
page.
2
Adjustment of
RGB1 black level
signal amplitude
1. Select the following group and sub-
jects.
Group: OUTPUT1
Subject: G1-BLK, G1-GAIN
For the color R, select the subjects
R1-BLK and R1-GAIN.
For the color B, select the subjects
B1-BLK and B1-GAIN.
2. Make sure the process adjustment
color bars are displayed.
3. For the color G, connect a oscillo-
scope to pin (2) of P1301.
4. For the colors R and B, connect the
oscilloscope to pin (1) of P1301 and
pin (3) of P1301, respectively.
1. Select the subject G1-GAIN. Using
the set's control switch or the remote
controller button, adjust the setting
so that the signal amplitude is 4.0
Vp-p±0.05 V.
2. Select the subject G1-BLK. Using the
set's control switch or the remote
controller button, adjust the setting
so that the white-to-white level is 1.8
Vp-p±0.1 V.
3. Do the same for the other colors R
and B.
~
The G1 subjects are linked with the
R1 and B1 subjects.
When the G1-BLK setting has been
changed, therefore, the R1-BLK and
B1-BLK settings vary themselves
accordingly. When the G1-GAIN set-
ting has been changed, equally, the
R1-GAIN and B1-GAIN settings vary
themselves accordingly. First make
the G1 settings and then readjust the
R1 and B1 settings as required.
3
Adjustment of
PSIG
1. Select the following group and sub-
jects.
Group: OUTPUT2
Subject: PSIG-H, PSIG-L
Make sure the PSIG-H and PSIG-
L settings are 64 and 100, respec-
tively.
1. Get the PSIG waveform displayed.
(Feed the XGA signal.)
2.5V DC
5.6V DC
GND
PSIG
Adjust the PSIG-H setting. Adjust the PSIG-L setting.
21
XG-C50X
4
Checking of
sample-and-hold
pulse phase
1. Feed the XGA-mode 75-Hz black
signal.
2. Select the following group and sub-
ject.
Group: OUTPUT3
Subject: GCK-PHASE
No.
Adjustment Items
Adjustment Conditions
Adjustment Procedures
1. Check the fixed value.
Fixed value: 6
5
Adjustment of
RGB counter-
voltage
1. Feed the counter-voltage adjust-
ment signal (XGA) prepared by the
Technical Department.
2. Select the following group and sub-
jects.
Group: OUTPUT3
Subject: RC (R), GC (G), BC (B)
1. Using the set's control switch or the
remote controller button, adjust the
settings to minimize flickers.
2. If the results are inconsistent at the
center and on both sides onscreen,
readjust the settings to get the same
results on both sides.
6
Adjustment of
RGB gradation
reproduction
1. Feed the SMPTE pattern signal.
2. Select the following group and sub-
ject.
Group: OUTPUT1
Subject: G1-BLK
1. Confirm that the 100% and 95% white
gradation as well as the 0% and 5%
black gradation are discernible.
2. If the white gradation looks differently,
finely adjust the G1-BLK setting.
7
Adjustment of
RGB white bal-
ance
1. Feed the 32-step gray scale signal
(XGA, 60 Hz).
2. Select the following group and sub-
jects.
Group: OUTPUT1
Subjects: R1-BLK (R), B1-BLK (B)
1. Adjust the R1-BLK and B1-BLK set-
tings to have the specified gradation
balance (according to the standard
monitor).
8
Adjustment of
video AGC
1. Feed the NTSC 10-step gray scale
signal.
2. Select the following group and sub-
ject.
Group: VIDEO
Subject: AGC-ADJ
3. Connect the oscilloscope between
TP4501 and TP4502
1. Using the set's control switch or the
remote controller button, adjust the
setting so that the white-to-black level
is 0.72 Vp-p±0.01 V.
9
Adjustment of
video brightness/
contrast
1. Feed the NTSC100% window pat-
tern signal.
2. Select the following group and sub-
jects.
Group: VIDEO
Subject: AUTO, PICTURE/BRIGHT
1. Feed the signal. Using the set's con-
trol switch or the remote controller
button, select the subject AUTO. The
setting will adjust itself.
2. Then adjust the PICTURE/BRIGHT
setting until the signal becomes bit-
less.
22
XG-C50X
10
Adjustment of
video tint
1. Feed the split color bar signal.
2. Select the following group and sub-
ject.
Group: VIDEO1
Subject: TINT
No.
Adjustment Items
Adjustment Conditions
Adjustment Procedures
1. Confirm the fixed value.
Fixed value: 128
11
Adjustment of
NTSC color
saturation
1. Feed the split color bar signal.
2. Select the following group and sub-
ject.
Group: VIDEO
Subject: N-COLOR
~
Connect the oscilloscope to pin (1)
of P1301.
1. Confirm the fixed value.
Fixed value: 54
(Reference: 0.4 Vp-p)
12
Adjustment of PAL
color saturation
1. Feed the PAL color bar signal.
2. Select the following group and sub-
ject.
Group: VIDEO
Subject: P-COLOR
~
Connect the oscilloscope to pin (1)
of P1301.
1. Confirm the fixed value.
Fixed value: 51
(Reference: 0.4 Vp-p)
13
Adjustment of
SECAM color
saturation
1. Feed the SECAM color bar signal.
2. Select the following group and sub-
ject.
Group: VIDEO
Subject: S-COLOR
~
Connect the oscilloscope to pin (1)
of P1301.
1. Confirm the fixed value.
Fixed value: 48
(Reference: 0.5 Vp-p)
14
Adjustment of
video white bal-
ance
1. Feed the NTSC monoscope pattern
signal.
2. Select the following group and sub-
jects.
Group: VIDEO
Subjects: V-R1-BLK, V-B1-BLK
1. Using the set's control switch or the
remote controller button, adjust the
settings to have the same white bal-
ance as on the standard monitor.
15
Adjustment of
COMPO bright-
ness
1. Feed the 0% gray pattern signal
(480I).
2. Select the following group and sub-
ject.
Group: COMPO
Subject: G-BRIGHT
1. Feed the signal to INPUT 1.
Adjust the setting so that some bits
should be missing onscreen.
100% White Red
100% White Red
100% White Red
23
XG-C50X
16
Adjustment of
COMPO CB offset
and CR offset
1. Feed the Y-0% brightness, Cb and
Cr 0% white pattern color difference
signal (480I).
2. Select the following group and sub-
ject.
Group: COMPO
Subject: AUTO
No.
Adjustment Items
Adjustment Conditions
Adjustment Procedures
1. Feed the signal. Using the set's con-
trol switch or the remote controller
button, select the subject AUTO. The
setting will adjust itself.
17
Adjustment of
COMPO white
balance
1. Feed the DTV monoscope pattern
signal.
2. Select the following group and sub-
jects.
Group: DLP
Subjects: C-R1-BLK, C-B1-BLK
1. Using the set's control switch or the
remote controller button, adjust the
settings to have the same white bal-
ance as on the standard monitor.
18
Adjustment of
sRGB white
balance
1. Feed the RGB 50% gray pattern
signal.
2. Select the following group and sub-
jects.
Group: OUTPUT1
Subjects: S-R1-BLK, S-R1-GAIN, S-
G1-BLK, S-G1-GAIN, S-B1-BLK, S-
B1-GAIN
3. Have the BM-5 brightness meter and
the standard white board at hand.
1. Make the S-R1-BLK setting the same
as the R1-BLK one.
Make the S-G1-BLK setting the same
as the R1-BLK one.
Make the S-B1-BLK setting the same
as the R1-BLK one.
Make the S-R1-GAIN setting the
same as the R1-GAIN one.
2. Adjust the S-B1-GAIN and S-G1-
GAIN settings so that the chroma-
ticity on the brightness meter should
be as follows.
x: .313±7/1000
y: .350±10/1000
Teaching intervals:
18
Brightness adjustable direction: Brightness up by increasing the setting (to be checked)
Adjusting points:
Three dimension (to be checked)
Gradation 4 (to be checked)
Gradation 5 (to be checked)
Gradation 6 (to be checked)
Other gradations not to be checked
Adjustable colors:
R, G and B adjustable (to be checked)
(2) Color irregularity correction (adjustment)
C50 conditions setup (          )
Correction procedure settings
Gradation 7:
2. Lower-gradation correction value to be used.
Gradation 6:
0. Correction with correction coefficient.
Gradation 5:
0. Correction with correction coefficient.
Gradation 4:
0. Correction with correction coefficient.
Gradation 3:
1. Upper-gradation correction value to be used.
Gradation 2:
1. Upper-gradation correction value to be used.
Gradation 1:
4. Initial value to be used.
Gradation 0:
4. Initial value to be used.
For the model in question, select the name entered in (2) to start the color irregularity correction. If the
set has its optical characteristics rather different from the standard ones or if the set has some color
irregularity lines missing, do the teaching for that set in particular. Use its specified correction coeffi-
cients in making the adjustment.
24
XG-C50X
19
Checking and
readjustment of
white balance
1. The adjusting conditions for each
item are as follows:
For RGB input, see Item 7.
For video input, see Item 13.
For COMPO input, see Item 16.
No.
Adjustment Items
Adjustment Conditions
Adjustment Procedures
1. Make sure the white balance is as
specified on the standard monitor.
For readjustment, proceed in the or-
der of RGB input, video input and
COMPO input.
20
Checking color-
related perfor-
mance
1. Receive the color bar signal.
1. Select L1 in the process mode.
Check the performance of color and
tint.
21
Checking of
picture-related
performance
1. Receive the monoscope pattern sig-
nal.
1. Select L2 in the process mode.
Check Picture, Brightness and Sharp-
ness.
22
Checking of RGB
performance
1. Receive the RGB signal.
1. Select L4 on the process mode.
Check Picture, Brightness, Red, Blue,
Clock, Phase, H-POS and V-POS.
23
Checking of off-
timer performance
1. Select OFF in the process mode.
Make sure that the off-timer starts
with 5-minute display, counts down
1 minute for 1 second, and turns off
when 0 minute is displayed.
24
Checking of
thermistor perfor-
mance
1. Heat the thermistor with a hair dryer.
1. Make sure the temperature is dis-
played.
25
Automatic sync
operation
1. Receive the phase checking pattern
signal.
1. Make sure that Clock, Phase, H-POS
and V-POS can be automatically
adjusted in the VGA/S-VGA/XGA
mode.
26
Checking of USB
performance
1. Using the USB cable, connect the
set to a personal computer.
1. Using the remote controller, make
sure that feed and return operations
are effective on the screen of the
personal computer.
27
Factory settings
1. Make the following settings.
Destination / Process adjustment /
Remote controller settings
North-American models: S4 "Factory
Setting 4"
Domestic models: S5 "Factory Set-
ting 5"
Other models: North-America: S3
"Factory Setting 3"

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