Sony GV-A500E, Service Manual

Page: 98 / 127

5-39
3-7. LCD SYSTEM ADJUSTMENT
Note 1 : The back light (fluorescent tube) is driven by a high
voltage AC power supply. Therefore, do not touch the
back light holder to avoid electrical shock.
Note 2 :
When replacing the LCD unit, be careful to prevent
damages caused by static electricity.
Note 3 : Set the brightness to the center using the LCD BRIGHT
button.
[Adjusting connector]
Most of the measuring points for adjusting the LCD display are
concentrated in the following connector.
CN802 of the VC-197 board. Connect the measuring instruments
via the multi CPC jig (J-6082-311-A).
The following table shows the Pin No. and signal name of the
connector.
[Power Supply Voltage]
Adjust the power supply voltage so that the battery terminal voltage
becomes 7.2 ± 0.1 Vdc .
[Video input signal for adjustment]
If stated as “10-step stair-step” in the signal column, input the 10-
step stair-step signal in the video input terminal as the video input
signal for the adjusting. Check that the input signal level is 1.00
Vp-p before adjusting.
Fig. 5-3-27.
Pin No.
1
3
5
7
9
Signal Name
VR
VB
GND
HDB
FRP
Pin No.
2
4
6
8
Signal Name
VG
V-COM
SYNC
SAT
100IRE
1.00V
Horizontal sync
Approx.
0.714V
Approx.
0.286V
1. LCD Initial Data Input
Mode VTR stop
Signal Arbitrary
Adjustment Page D
Adjustment Address 3C to 3F, 52 to 62
Adjusting method:
1)
Set page: 0, address: 01, data: 01.
2) Select page: D, and input the data in the following table.
Note : To write in the non-volatile memory (EEPROM), press
the PAUSE button of the adjusting remote commander
each time to set the data.
3) Set page: 0, address: 01, data: 00.
( ): NTSC model only (GV-A500)
Address
3C
3D
3E
3F
52
53
54
55
56
57
58
59
5A
5B
5C
5D
5E
5F
60
61
62
NTSC
4”
LCD
08
07
03
05
88
79
72
76
68
97
85
97
7D
7E
69
88
00
69
00
00
A1
PAL
4”
LCD
08
08
03
05
86
66
60
79
73
9A
56
9A
7C
7D
60
86
60
60
B0
67
A1
Remark
Fixed value
Fixed value
Fixed value
Fixed value
Fixed value
(Fixed value)
Fixed value
Fixed value
Fixed value
Fixed value
Data