DOWNLOAD Sharp XG-C40XE Service Manual ↓ Size: 857.03 KB | Pages: 50 in PDF or view online for FREE

36

No.

Adjustment Items

Adjustment Conditions

Adjustment Procedures

1

Initialization of
EEPROM

1. Turn on the power (the lamp lights
up) and warm up the system for 15
minutes.

1. Make the following settings.
Press S5101 to enter the process mode, and
execute S2 on the SSS menu. Now the
EEPROM, except for the PC I/F unit, is
initialised.
Do not execute S1, or the PC I/F unit itself
will be initialised.
(The PC I/F unit has been factory adjusted.)
To adjust the PC I/F unit, refer to the end of
the section.

2

3.3V power supply
adjustment

1. Turn on the power.
2. Connect the digital voltmeter to
TP1446.

Adjust R1649 so that the voltmeter should
read 3.43 ±0.03 Vp-p.

3

2.5V power supply
adjustment

1. Turn on the power.
2. Connect the digital voltmeter to
TP1447.

Adjust R1652 so that the voltmeter should
read 2.60 ±0.05 Vp-p.

4

R drive

1. Feed the 100% red-only signal.
Make the following choice.
Group : A/D
Subject : R-D

Using the control switches or the remote
controller buttons, adjust the data so that the
signal becomes bit-less (noise).

5

B drive

1. Feed the 100% blue-only signal.
Make the following choice.
Group : A/D
Subject : R-D

Using the control switches or the remote
controller buttons, adjust the data so that the
signal becomes bit-less (noise).

6

G drive

1. Feed the 100% green-only signal.
Make the following choice.
Group : A/D
Subject : R-D

Using the control switches or the remote
controller buttons, adjust the data so that the
signal becomes bit-less (noise).

7

RGB 1 system black level
signal amplitude (odd-
numbered)

1. Make the following choice:
Group : OUTPUT 1
Subject : G1-BLK
G1-GAIN
For red, choose the subjects
R1-BLK and R1-GAIN.
For blue, choose the subjects
B1-BLK and B1-GAIN.
2. Connect the oscilloscope to
TP1101 for red.
TP1201 for green
TP1301 for blue

• 

Choose the subject G1-GAIN and
adjust the signal amplitude to 3.3 ±0.1
Vp-p using the control switches or the
remote controller buttons.

• 

Next, choose the subject G1-BLK and
adjust the white to white level to 2.6
±0.1V DC.

• 

Adjust the signal's amplitude and white
to white level to 3.3 ± 0.1Vp-p and 2.6 ±
0.1V DC, respectively, for red and blue.

37

No.

Adjustment Items

Adjustment Conditions

Adjustment Procedures

8

P SIGNAL

1. Connect the oscilloscope to
TP1701 for red.
TP1702 for green
TP1703 for blue.
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 colours, make
sure their waveforms are similar to that
of the red colour.

• 

Make sure the pin stripe of every 12 dot
doesn't appear at 10 steps signal of
side nays. (Appearing white pin stripe
or black one, adjust the PSIG-H.)

9

Panel ghost
adjustment

1. Project the XGA60Hz ghost test
pattern (black characters in bold on
the halftone RGB background).
Group: OUTPUT3
2. GCK-PHASE adjustment
Make sure the setting is fixed at 8
(initial value).
3. EN-WIDTH adjustment
Make sure the setting is fixed at 8
(initial value).
4. ENR-PHASE adjustment (RLCD
ghost adjustment)
5. ENG-PHASE adjustment
(G-LCD ghost adjustment)
6. ENB-PHASE adjustment (BLCD
ghost adjustment)

• 

ENR-PHASE adjustment (R-LCD ghost
adjustment)
1Increase the setting until a ghost
image (see Note) becomes visible at
the left of the back characters on the R
half-tone background.
2Lower the setting point by point until
the lefthand ghost image (1 above)
disappears.
3Further lower the setting by one point.

• 

ENG-PHASE adjustment (G-LCD ghost
adjustment)
Adjust the G ghost image by following
the same procedures described under
step 1 above.

• 

ENB-PHASE adjustment (B-LCD ghost
adjustment)
Adjust the B ghost image by following
the same procedures described under
step 1 above.

Note: Left-hand ghost image: Characters are
shown double 12 dots left from the real
characters.
Reference: This adjustment is made
because the EPSON LCD panel may have
1- or 2- point differences due to lot-by-lot
variations.

10

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 2.)
Fix the RCK-, GCK- and BCK-PHASE
settings all to 8.

Using the control switches or the remote
controller buttons, make sure that the
“OUTPUT 3” characters 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.

38

No.

Adjustment Items

Adjustment Conditions

Adjustment Procedures

11

RGB countervoltage
adjustment

1. Feed the black-and-red (25%)
stripe signal (XGA).
2. Make the following choice:
Group : OUTPUT 3
Subject : RC (R)
and
Group : OUTPUT 3
Subject : RC-INV (R)

• 

Using the control switches or the
remote controller buttons, adjust the
data in order to minimise the flicker.

• 

Make the same adjustment for BC (B),
GC (G), RC-INV (B) and RC-INV (G).

• 

See if the image is equally adjusted at
the centre and both sides of the screen.
If not, readjust the setting to have the
image equal at right and left.

12

RGB gradation
regeneration adjustment

1. Feed the green-only SMPTE
pattern signal (XGA).
Group : OUTPUT 1
Subject : G1-BLK

Adjust the G-BLK data until the gradation of
the portion 1 (95% and 100% white) shown
below can be slightly recognised. Make sure
also that the gradation of the portion 2 (0%
and 5% black) is visible.

13

RGB white balance

1. Feed the 32-step grey scale signal
(XGA).
Group : OUTPUT 1
Subject : R1-BLK (R)
B1-BLK (B)

Choose the subjects R1-BLK and B1-BLK
and adjust the black balance of the
gradation.

14

Horizontal centre

1. Feed the NTSC monoscope pattern
signal.
2. Group : VIDEO 2
Subject : N358-DLY (4)
N443-DLY (0)
PAL-DLY (3)
SECAM-DLY (0)
Make sure the settings are as above.
3. Group : VIDEO 1
Subject : NTSC-H

Using the control switches or the remote
controller buttons, adjust the data to have
the same overscan.

15

Video picture adjustment

1. Feed the split colour bar signal.
Group : VIDEO 1
Subject : PICTURE
2. Connect the oscilloscope between
pin (2) of P801 and GND.

Using the control switches or the remote
controller buttons, adjust the black-to-white
(100%) level difference to 2.0 ±0.02 Vp-p.

16

Video brightness
adjustment

1. Feed the baseband (split colour
bar) signal. (The ONAIR signal is not
accepted because of its too much
noise.)
Group : VIDEO 2

Using the control switches or the remote
controller buttons, adjust the setting until the
black signal becomes bit-less.

39

Subject : VROS/VGOS/VBOS
2. Press the control switch or the
remote control’s mute button (to set
the gamma correction to the process
setting).