DOWNLOAD Sharp XG-NV6XE (serv.man4) Service Manual ↓ Size: 1.87 MB | Pages: 47 in PDF or view online for FREE

Model
XG-NV6XE (serv.man4)
Pages
47
Size
1.87 MB
Type
PDF
Document
Service Manual
Brand
Device
Projector / Service Instructions Troubleshooting
File
xg-nv6xe-sm4.pdf
Date

Sharp XG-NV6XE (serv.man4) Service Manual ▷ View online

25
XG-NV6XE
ELECTRICAL ADJUSTMENT
Hook up a signal generator, or a DOSV or Mac personal computer to the projector in order to feed the
signals specified in the Adjusting conditions.
No.
Adjusting point
Adjusting conditions
Adjusting procedure
1
EEPROM
initialization
1. Turn on the power (make
sure the lamp lights up) and
warm up the unit for 15 min-
utes.
»
Make the following settings:
Press S5001 to call up the process mode and
execute S2 and S4 in the SSS menu. Now the
system, with the PC board not included, is initial-
ized. Do not execute S1 because otherwise the
PC board will be initialized.
To adjust the PC board, follow the instruction in
"Adjusting the PC Interface". (See page 32)
4
R drive
1. Make the following choice.
Group : A/D
Subject : GAIN
Make sure the GAIN value
is 155.
2. Feed the 100% red-only sig-
nal. 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 be-
comes bit-less (noise).
5
B drive
1. Feed the 100% blue-only
signal. Make the following
choice.
Group : A/D
Subject : B-D
»
Using the control switches or the remote controller
buttons, adjust the data so that the signal be-
comes bit-less (noise).
6
G drive
1. Feed the 100% green-only
signal. Make the following
choice.
Group : A/D
Subject : G-D
»
Using the control switches or the remote controller
buttons, adjust the data so that the signal be-
comes bit-less (noise).
2
3.3V power
supply
adjustment
1. Turn on the power.
2. Connect the digital voltme-
ter to TP8083.
»
Adjust VR704 so that the voltmeter should read
3.300 V ±100 mV.
3
2.5V power
supply
adjustment
1. Turn on the power.
2. Connect the digital voltme-
ter to TP8082.
»
Adjust R705 so that the voltmeter should read
2.600 V ±50 mV.
7
GAIN
1. Make the following choice.
Group : A/D
Subject : GAIN
»
Set the Gain value 170.
26
XG-NV6XE
No.
Adjusting point
Adjusting conditions
Adjusting procedure
8
RGB 1 system
black level
signal amplitude
(odd-numbered)
»
 Choose the subject R1-GAIN and adjust the sig-
nal amplitude to 3.1 ±0.1 Vp-p using the control
switches or the remote controller buttons.
»
Next, choose the subject R-BLK and adjust the
black peak level to 2.9 ±0.1V DC.
1. Make the following choice:
Group : OUTPUT 1
Subject : R1-BLK
R1-GAIN
For green, choose the sub-
    jects G1-BLK and G1-
GAIN.
For blue, choose the sub-
jects B1-BLK and B1-GAIN.
2. Connect the oscilloscope to
TP1101  for red.
    TP1201  for green
    TP1301  for blue
3.1Vp-p
2.9V DC 
9
Offset voltage
adjustment
1. Feed the 50% gray pattern
signal.
2. Select the following subject.
Group : OUTPUT2
Subject : R-OFFSET
Select the subjects G-OFF-
SET and B-OFFSET for the
green and blue colours, re-
spectively.
3. Connect the instrument to
TP1101 and TP1104 (R).
4. Connect the instrument to
TP1201 and TP1204(G) for
green, and TP1301 and
TP1304(B) for blue.
»
Select the subject R-OFFSET. Make such adjust-
ment that the signal level at the top center 
1
 and
that at the bottom center 
2
 of the output wave-
form on the instrument screen be the same.
1
2
Before adjustment
After adjustment
»
Make the same adjustments for green and blue.
10
P SIGNAL
1. Connect the oscilloscope to
TP1102 for red.
    TP1202 for green.
    TP1302 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 wave-
forms are similar to that of the red colour.
2.5V DC
5.0V DC
GND
PSIG
(Adjust with PSIG-L.)
(Adjust with PSIG-H.)  
»
Make the same adjustments for green and blue.
27
XG-NV6XE
No.
Adjusting point
Adjusting conditions
Adjusting procedure
11
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 RCK-, GCK- and
BCK-PHASE settings 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.
12
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)
»
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.
14
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.)
13
RGB gradation
regeneration
adjustment
1. Feed the green-only SMPTE
pattern signal.(XGA)
Group : OUTPUT 1
Subject : G1-GAIN
»
Adjust the G-GAIN data until the gradation of the
portion 
1
 (95% and 100% white) shown below
can be slightly recognized.  Make sure also that
the gradation of the portion 
2
 (0% and 5% black)
is visible.
15
Horizontal
center
1. Feed the NTSC mono-
scope pattern signal.
2. Group : VIDEO 2
Subject : N358-DLY     (0)
N443-DLY     (0)
PAL-DLY       (0)
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.
1
2
28
XG-NV6XE
No.
Adjusting point
Adjusting conditions
Adjusting procedure
16
Video picture
adjustment
1. Feed the split colour bar
signal.
Group : VIDEO 1
Subject : PICTURE
2. Connect the oscilloscope
between pin (1) of P801
and GND.
»
Using the control switches or the remote controller
buttons, adjust the black-to-white (100%) level
difference to 2.1 ±0.02 Vp-p.
100% White
2.1Vp-p
17
Video AGC
1. Feed the split colour bar
signal.
Group : VIDEO 1
Subject : AGC
2. Connect the oscilloscope
between pin (1) of P801
and GND.
»
Using the control switches or the remote controller
buttons, adjust the black-to-white (100%) level
difference to 1.55 ±0.02 Vp-p.
100% White
1.55Vp-p
18
Video
brightness
adjustment
1. Feed the baseband (split
colour bar) 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
becomes bit-less and set to -2 point of value.
19
Tint
1. Feed the split colour bar
signal.
Group : VIDEO 1
Subject : TINT
2. Connect the oscilloscope to
pin (4) of P801.
»
Using the control switches or the remote controller
buttons, adjust the data to have the -(B-Y) wave-
form downhill straight.
20
NTSC colour
saturation level
1. Feed the split colour bar
signal.
Group : VIDEO 1
Subject : N-COLOR
2. Connect the oscilloscope to
pin (1) of P801.
»
Using the control switches or the remote controller
buttons, adjust the difference between the 100%
white portion and the red portion to 0.20 ±0.02 Vp-p.
   (same as 100% white)
100% White Red
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