DOWNLOAD Sony XTL-750W / XVM-750WEX Service Manual ↓ Size: 1.21 MB | Pages: 20 in PDF or view online for FREE

5

6

1

 screws (2.6x5)

4

 stand bracket (W)

2

 screws (2.6x5)

3

 screws (2.6x5)

7

 CN601

8

 CN602

9

 CN301

0

 connector

qa

 CN302

claw

claw

5

 screws (M2x6), tapping

6

 screws (M2x6), tapping

qs

 rear panel assy

1

 screw (M2x6), tapping

5

 screws (M2x6), tapping

6

 screws (M2x6), tapping

8

 MAIN board

2

 CN101

3

 Unsolder.

7

 sheet

switch

4

 MONITOR 

    SUB board

Note : Follow the disassembly procedure in the numerical order given.

7

+

–

NTSC pattern
generator

MONITOR OUT

Monitor
XVM-753W

Regulated DC
power supply

ACC cord

Parking

VIDEO OUT
(75 

Ω

)

Hideaway unit
XT-993V

INPUT (1)
(VIDEO)

7.5Vp-p

A

0V

0.74Vp-p

white

black

The measuring equipment below are used for these electrical
adjustments:
• Oscilloscope
• NTSC pattern generator
• Regulated DC power supply
• Digital voltmeter

Unless otherwise specified, the measuring equipment should be
connected as shown below:

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.

Procedure:
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.

Procedure:
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.

Procedure:
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.

Procedure:
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.

Procedure:
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

Procedure:
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.

8

γ

Procedure:
1. Display the gray scale on the monitor screen.
2. Connect an oscilloscope to TP106 on the MONITOR MAIN

board.

3. Adjust RV212 so that the white level of the waveform is at

4.6 ± 0.05V DC.

Adjustment Location: Monitor Main Board

Procedure:
1. Display the gray scale on the monitor screen.
2. Connect an oscilloscope to TP107 on the MONITOR MAIN

board.

3. Adjust RV207 so that the white level of the waveform is at

4.6 ± 0.05V DC.

4. Connect an oscilloscope to TP108 on the MONITOR MAIN

board.

5. Adjust RV209 so that the white level of the waveform is at

4.4 ± 0.05V DC.

Adjustment Location: Monitor Main Board

Procedure:
1. Display the navigation map screen on the monitor screen.
2. Adjust RV211 so as to ensure that the screen has the highest

contrast with no flicker.

Adjustment Location: Monitor Main Board

MONITOR MAIN BOARD (SIDE A)

RV211 RV210

RV209 RV207

R AND B LEVEL

γ

 2

RV213

γ

 0

RV212

RV601

INVERTER

VOLTAGE

RV208

RGB

AMPLITUDE

RV401

DC/DC

CONVERTER

VOLTAGE

RV201

BRIGHT

VCOM

MONITOR MAIN BOARD (SIDE B)

TP64

TP63

TP57

TP14

TP67

TP70

TP102

TP107

TP106

TP108