JVC KV-M705, Service Manual

Page: 13 / 47

(No.MA209)1-13
4.1.4 LCD adjustment
LCD free run frequency adjustment
(1) Set the main unit in a service mode.
(2) Select "LCD SETTING" of the service mode.
(3) Connect the frequency counter to TP708 and TP761 (GND) on the monitor board.
(Not supplying a signal in the input.)
(4) Select "DAC OUT" of LCD SETTING menu to adjust.
(5) Carry out this adjustment with both modes of NTSC and PAL.
(Change "NTSC/PAL CHANGE" of LCD SETTING menu)
NTSC
15.734kHz PAL
15.625kHz
COM AMPLITUDE
COM DC
DAC OUT
RGB AMPLITUDE
BRIGHT
GAMMA1
GAMMA2
SUB-BRIGHT R
SUB-BRIGHT B
PHASE
CONTRAST
TINT
COLOR
PICTURE
INPUT MODE/SW
AGC SW ON
GAMMA TEST OFF
NTSC/PAL CHANGE
SETTING DISP ON
Item Contents
LCD SETTING MENU
Amplitude of the common voltage
Center value of the LCD pulse
Free run frequency of the LCD
Amplitude of black-black
Brightness
GAMMA point 1
Difference with GAMMA point 1
Red brightness
Blue brightness
Phase of R-Y/B-Y
Contrast of video input
Hue
Deepness of a color
Picture
This mode not using it by service.
This mode not using it by service.
This mode not using it by service.
Reshuffling of NTSC/PAL
On/off for indication of adjustment value
LCD SETTING NTSC
COM AMPLITUDE XXH
MODE : BACK DW/UP : SET
Main unit operation in adjustment
[MODE] key : Return to LCD SETTING menu.
[ ], [ ] key : Change value, one step changes by one
time of input
Carry out this operation with both modes of NTSC and PAL.
Adjustment for all version (Carry out this adjustment with both modes of NTSC and PAL.)
COM AMPLITUDE
COM DC
DAC OUT
RGB AMPLITUDE
BRIGHT
GAMMA1
GAMMA2
SUB-BRIGHT R
SUB-BRIGHT B
PHASE
CONTRAST
TINT
COLOR
PICTURE
Item Production jig Def value
3E
0A
Adjustment of frequency
DD
30
85
FF
80
85
30
A0
98
7B
10
NTSC adjustment
Reference value
6D
28
CE
30
85
FF
84
8A
30
AB
98
7D
10
Adjustment
Adjustment
Adjustment
Adjustment
Fixed value
Fixed value
Fixed value
Adjustment
Adjustment
Adjustment
Adjustment
Adjustment
Adjustment
Fixed value COM AMPLITUDE
COM DC
DAC OUT
RGB AMPLITUDE
BRIGHT
GAMMA1
GAMMA2
SUB-BRIGHT R
SUB-BRIGHT B
PHASE
CONTRAST
TINT
COLOR
PICTURE
Item Production jig Def value
3F
1A
Adjustment of frequency
D0
30
85
FF
80
85
30
A0
92
7F
10
Reference value
72
25
D0
30
85
FF
84
8A
30
AB
91
84
10
Adjustment
Adjustment
Adjustment
Adjustment
Fixed value
Fixed value
Fixed value
Adjustment
Adjustment
Adjustment
Adjustment
Adjustment
Adjustment
Fixed value
PAL adjustment
When all the adjustment values are input, press the
[MENU] button to memorize the values in EEPROM.
When the power supply is turned off without pressing
the [MENU] button, the adjustment values are not
memorized.