JVC KV-M705 Service Manual page 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 PAL
15.734kHz 15.625kHz
LCD SETTING MENU
Item
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
Adjustment for all version (Carry out this adjustment with both modes of NTSC and PAL.)
NTSC adjustment
Item Production jig Def value
COM AMPLITUDE 3E
COM DC 0A
DAC OUT Adjustment of frequency
RGB AMPLITUDE DD
BRIGHT 30
GAMMA1 85
GAMMA2 FF
SUB-BRIGHT R 80
SUB-BRIGHT B 85
PHASE 30
CONTRAST A0
TINT 98
COLOR 7B
PICTURE 10
Contents
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
Reference value
6D Adjustment
28 Adjustment
Adjustment
CE Adjustment
30 Fixed value
85 Fixed value
FF Fixed value
84 Adjustment
8A Adjustment
30 Adjustment
AB Adjustment
98 Adjustment
7D Adjustment
10 Fixed value
LCD SETTING NTSC
COM AMPLITUDE
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.
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.
PAL adjustment
Item Production jig Def value
COM AMPLITUDE 3F
COM DC 1A
DAC OUT Adjustment of frequency
RGB AMPLITUDE D0
BRIGHT 30
GAMMA1 85
GAMMA2 FF
SUB-BRIGHT R 80
SUB-BRIGHT B 85
PHASE 30
CONTRAST A0
TINT 92
COLOR 7F
PICTURE 10
XXH
Reference value
72 Adjustment
25 Adjustment
Adjustment
D0 Adjustment
30 Fixed value
85 Fixed value
FF Fixed value
84 Adjustment
8A Adjustment
30 Adjustment
AB Adjustment
91 Adjustment
84 Adjustment
10 Fixed value
(No.MA209)1-13