Sharp XG-NV21SE (serv.man4) Service Manual ▷ View online
27
XG-NV21SE
XG-NV21SM
XG-NV21SA
Adjusting the PC board (CPCi-0025CE04. PC I/F Unit)
1. Initializing te EEPROM
1)
Press the S5001 key to call the process mode.
2)
Execute S1 on the SSS menu. (The S1 is used to initialize the PC board alone. Do not execute S2 because
otherwise all the adjusted data but the PC board will be initialized.)
otherwise all the adjusted data but the PC board will be initialized.)
2. Adjusting the level settings
2-1. Oscilloscope range setting
Set the range to DC 1V/div. and 5µs/div.
2-2. Input signal
Feed the SVGA 800x600 60Hz gradation waveform signal.
2-3. Adjusting and checking the level settings
1)
Press the S5001 key to call the process mode.
2)
Adjust the SH-PHASE setting on the "OUTPUT 3" menu until the "OUTPUT 3" characters are not blurry any
longer.
longer.
3)
Connect a oscilloscope to TP2. Adjust the BRIGHT setting of "OUTPUT 2" to have the black level of the signal
at 1.7V.
at 1.7V.
4)
Adjust the ROS setting on the A/D menu until the voltage at the positive pole of C64 or pin (2) of IC11 becomes
1.7V.
1.7V.
5)
Adjust the GOS setting on the A/D menu until the voltage at the positive pole of C57 or pin (2) of IC10 becomes
1.7V.
1.7V.
6)
Adjust the BOS setting on the A/D menu until the voltage at the positive pole of C50 or pin (2) of IC9 becomes
1.7V.
1.7V.
7)
Make sure the GAIN setting on the A/D menu is 163.
8)
Connect the oscilloscope to TP1. Adjust the R-D setting on the A/D menu until the white top level of the signal
becomes 3.6V. (Make sure that both the black and white graduations are visible clearly.)
becomes 3.6V. (Make sure that both the black and white graduations are visible clearly.)
9)
Connect the oscilloscope to TP3. Adjust the B-D setting on the A/D menu until the white top level of the signal
becomes 3.6V. (Make sure that both the black and white graduations are visible clearly.)
becomes 3.6V. (Make sure that both the black and white graduations are visible clearly.)
10) Connect the oscilloscope to TP2. Adjust the G-D setting on the A/D menu until the white top level of the signal
becomes 3.6V. (Make sure that both the black and white graduations are visible clearly.)
11) Press the S5001 key to exit from the process mode.
No.
Adjusting point
Adjusting conditions
Adjusting procedure
21
Audio system
performance
check
performance
check
»
In the process mode nad select L3. Check the bass,
treble and balance.
treble and balance.
22
RGB
performance
check
performance
check
1. Receive the RGB signal.
»
In the process mode and select L4. Check the pic-
ture, brightness, red, blue, clock, phase, horizontal
position, and vertical position.
ture, brightness, red, blue, clock, phase, horizontal
position, and vertical position.
23
Off-timer
performance
check
performance
check
»
In the process mode and select OFF. Make sure that
the off-timer starts with “5” (minutes), counts down
each minute in 1 second, and turns off the set at “0”.
the off-timer starts with “5” (minutes), counts down
each minute in 1 second, and turns off the set at “0”.
24
Thermistor
performance
check
performance
check
1. Heat the thermistor using a
dryer.
»
Make sure the “TEMP” is displayed.
S4
“Factory setting 4”
Remote controller
setting
setting
Process
adjustment
adjustment
»
Make the following settings.
25
Factory settings
28
XG-NV21SE
XG-NV21SM
XG-NV21SA
TROUBLE SHOOTING TABLE
Checking the PWB performance
RGB input in trouble
Feed test pattern signal from
PC.
PC.
Yes
No
Use specified cable.
Is specified cable connected
between PC and projector?
between PC and projector?
Yes
No
Power circuit in trouble.
Is supply voltage as specified?
Yes
No
Check the connectors, starting
from the PC unit input circuit.
from the PC unit input circuit.
Does image appear?
Video input in trouble
Go to "Checking the video unit
circuit".
circuit".
Through-output in trouble
Through-output circuit in
trouble.
trouble.
Remote control in trouble
Go to "Checking the remote
control circuit".
control circuit".
Go to "Checking the PC I/F
unit ".
unit ".
29
XG-NV21SE
XG-NV21SM
XG-NV21SA
TROUBLE SHOOTING TABLE
(Continued)
Checking the video unit circuit
Yes
No
Check the IC6001 selector switch,
terminal voltage and input circuit.
terminal voltage and input circuit.
Yes
No
Is there video signal input at pin (15)
of IC6004?
of IC6004?
Check the low-pass and buffer
circuits of Q6009 thru Q6014.
circuits of Q6009 thru Q6014.
Yes
No
Are there signal outputs at pins (6)
and (8) of IC6004?
and (8) of IC6004?
Check IC6004 and its peripheral
circuits (bias).
circuits (bias).
Yes
No
Check the low-pass and buffer circuits
of Q6002 thru Q6008. Is the signal as
specified?
of Q6002 thru Q6008. Is the signal as
specified?
Go to "Checking IC801 (RGB signal
output circuit)".
output circuit)".
Is there video signal output at pin (7)
of IC6001?
of IC6001?
Check Q6002 thru Q6008 and their
peripheral circuits.
peripheral circuits.
Checking the video system
Yes
No
Go to "Lamp fails to light-up".
Yes
No
Is specified voltage fed to EA
connectors? Also, is the voltage signal
P1501 and P1502 right?
connectors? Also, is the voltage signal
P1501 and P1502 right?
Check the power circuit and its parts.
Yes
No
Are there signal inputs at pins (40)
and (45) of IC806?
and (45) of IC806?
Are there signals at pin (4) of IC401
and pin (4) of IC402?
and pin (4) of IC402?
Are there signal outputs at pins (3)
and (6) of IC816?
and (6) of IC816?
Yes
Check the video unit circuit
(IC6004 and its peripheral
circuits).
(IC6004 and its peripheral
circuits).
No
Check the oscillation circuit
of IC401 and IC402, and
their peripheral circuits.
of IC401 and IC402, and
their peripheral circuits.
Yes
Go to "Checking IC801
(RGB signal output circuit)".
(RGB signal output circuit)".
No
Check IC816, IC806 and
their peripheral circuits as
well as switching circuit.
their peripheral circuits as
well as switching circuit.
Is the lamp on?
30
XG-NV21SE
XG-NV21SM
XG-NV21SA
TROUBLE SHOOTING TABLE
(Continued)
Checking IC801 (RGB signal output circuit)
Yes
No
Check the data transfer and other
performance at pins (17) and (18) of
video IC801.
performance at pins (17) and (18) of
video IC801.
No
Go to "No colour or unusual tone",
"No Y signal" or "Out of sync".
"No Y signal" or "Out of sync".
Yes
No
Are there R.G.B. waveforms of
IC1501?
IC1501?
Check IC1501 (amplifier), IC1502
(RGB offset) and their peripheral
circuits.
(RGB offset) and their peripheral
circuits.
No
Are A/D outputs of IC1504, IC1505
and IC1506 as specified?
and IC1506 as specified?
Check the VCLK, IC1504, IC1505,
IC1506 and their peripheral circuits.
IC1506 and their peripheral circuits.
Yes
Are there RGB output waveforms at
pins (31), (32) and (33) of IC801?
pins (31), (32) and (33) of IC801?
Checking the chroma and Y signals of IC801
(RGB signal output)
(RGB signal output)
Yes
No
Go to "Checking the video unit
circuit".
circuit".
Yes
No
Check the IC816 switching and their
peripheral circuits. If there is no signal
at pins (8) and (16), check 3-D noise
reduction circuit (IC806).
peripheral circuits. If there is no signal
at pins (8) and (16), check 3-D noise
reduction circuit (IC806).
Check IC806 (3-D noise reduction
circuit) and its peripheral circuits.
circuit) and its peripheral circuits.
Go to "Checking IC801 (RGB
signal output circuit)".
signal output circuit)".
Are there signal inputs at pins (12)
(Y signal) and (19)(chroma signal) of
P402?
(Y signal) and (19)(chroma signal) of
P402?
Are there output waveforms at pins
(3)(chroma signal) and (6)
(Y signal)of IC816?
(3)(chroma signal) and (6)
(Y signal)of IC816?
Go to "Trouble shooting table for PC
I/F unit".
I/F unit".
Click on the first or last page to see other XG-NV21SE (serv.man4) service manuals if exist.