Sharp XG-NV2SB, Service Manual

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30
XG-NV2SB
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.)
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.
3) Connect a oscilloscope to TP2. Adjust the BRIGHT setting of "OUTPUT 2" to have the black level of the signal
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.
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.
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.
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.)
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.)
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
»
In the process mode nad select L3. Check the bass,
treble and balance.
22 RGB
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.
23 Off-timer
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”.
24 Thermistor
performance
check 1. Heat the thermistor using a
dryer.
»
Make sure the “TEMP” is displayed.
S4 “Factory setting 4”
Remote controller
setting
Process
adjustment
»
Make the following settings.
25 Factory settings