Read Sony XTL-750W / XVM-750WEX Service Manual online
7
+
–
NTSC pattern
generator
generator
MONITOR OUT
Monitor
XVM-753W
XVM-753W
Regulated DC
power supply
power supply
ACC cord
Parking
VIDEO OUT
(75
(75
Ω
)
Hideaway unit
XT-993V
XT-993V
INPUT (1)
(VIDEO)
(VIDEO)
7.5Vp-p
A
0V
0.74Vp-p
white
black
Equipment Used
The measuring equipment below are used for these electrical
adjustments:
• Oscilloscope
• NTSC pattern generator
• Regulated DC power supply
• Digital voltmeter
adjustments:
• Oscilloscope
• NTSC pattern generator
• Regulated DC power supply
• Digital voltmeter
Connection of Equipment
Unless otherwise specified, the measuring equipment should be
connected as shown below:
connected as shown below:
SECTION 3
ELECTRICAL ADJUSTMENTS
MONITOR SECTION
Setup for Adjustment
The adjustment signal is a 5-step gray scale signal from a NTSC
pattern generator.
Input the gray scale signal into the tuner unit and connect an oscil-
loscope to TP14 on the MONITOR MAIN board. Check that the
width between the black and white levels of the gray scale signal is
0.74 Vp-p.
pattern generator.
Input the gray scale signal into the tuner unit and connect an oscil-
loscope to TP14 on the MONITOR MAIN board. Check that the
width between the black and white levels of the gray scale signal is
0.74 Vp-p.
DC/DC Converter Voltage Adjustment
Procedure:
1. Display the gray scale on the monitor screen.
2. Connect a digital voltmeter to TP57 on the MONITOR MAIN
1. Display the gray scale on the monitor screen.
2. Connect a digital voltmeter to TP57 on the MONITOR MAIN
board.
3. Adjust RV401 so that the reading on the digital voltmeter is
5.35 ± 0.05 V.
Adjustment Location: See page 8.
Inverter Voltage Adjustment
Procedure:
1. Display the gray scale on the monitor screen.
2. Connect a digital voltmeter to TP64 on the MONITOR MAIN
1. Display the gray scale on the monitor screen.
2. Connect a digital voltmeter to TP64 on the MONITOR MAIN
board.
3. Adjust RV601 so that the reading on the digital voltmeter is
7.80 ± 0.05 V.
Adjustment Location: See page 8.
Bright Adjustment
Procedure:
1. Display the gray scale on the monitor screen.
2. Connect a digital voltmeter to TP70 on the MONITOR MAIN
1. Display the gray scale on the monitor screen.
2. Connect a digital voltmeter to TP70 on the MONITOR MAIN
board.
3. Adjust RV201 so that the reading on the digital voltmeter is
2.13 ± 0.02 V.
Adjustment Location: See page 8.
VCOM Adjustment (1)
Procedure:
1. Display the gray scale on the monitor screen.
2. Connect an oscilloscope to TP102 on the MONITOR MAIN
1. Display the gray scale on the monitor screen.
2. Connect an oscilloscope to TP102 on the MONITOR MAIN
board.
3. Adjust RV210 so that the amplitude of the output waveform is
7.5 ± 0.1 Vp-p.
4. Adjust RV211 so that the level A of the output waveform is at
5.5 ± 0.05V DC.
Adjustment Location: See page 8.
RGB Amplitude Adjustment
Procedure:
1. Display the gray scale on the monitor screen.
2. Connect a digital voltmeter to TP63 on the MONITOR MAIN
1. Display the gray scale on the monitor screen.
2. Connect a digital voltmeter to TP63 on the MONITOR MAIN
board.
3. Adjust RV208 so that the reading on the digital voltmeter is
2.37 ± 0.02 V.
Adjustment Location: See page 8.
γ
2 Adjustment
Procedure:
1. Display the gray scale on the monitor screen.
2. Connect a digital voltmeter to TP67 on the MONITOR MAIN
1. Display the gray scale on the monitor screen.
2. Connect a digital voltmeter to TP67 on the MONITOR MAIN
board.
3. Adjust RV213 so that the reading on the digital voltmeter is
2.19 ± 0.02 V.
Adjustment Location: See page 8.
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