Kenwood LZ-702IR - LCD Monitor, Руководство по обслуживанию

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LZ-702IR
12
Step Positive/Negative Appraisal Sampling Enabling Line
1st step 23 24H~35H
2nd step 43 44H~55H
3rd step 63 64H~75H
4th step 83 84H~95H
5th step 103 104H~115H
6th step 123 124H~135H
7th step 143 144H~155H
8th step 163 164H~175H
Process/Requirements for data sampling
∗
When
γ
IC serial data is changed, more wait time is required
than shown below.
NTSC/PAL switching ................. Approx. 500ms
AGC ON/OFF ............................ Approx. 500ms
γ
AMP ON/OFF ......................... Less than 1ms
PICTURE .................................. Less than 1ms
COLOR ..................................... Less than 1ms
TINT .......................................... Less than 1ms
PHASE ...................................... Less than 1ms
CONT-VIDEO ............................ Less than 1ms
CONT-RGB1,2 .......................... Less than 1ms
GAMMA1 .................................. Less than 1ms
GAMMA2 .................................. Less than 1ms
RGB_AMPLITUDE .................... Approx. 100ms
BRIGHT .................................... Approx. 100ms
SUB-BRIGHT R,B ..................... Less than 1ms
COM_AMPLITUDE ................... Less than 1ms
COM_DC .................................. Less than 1ms
DA_COUT ................................. Less than 1ms
∗
Adjusting
q
~
i
input signal/setting up selector
Input signal: Monochrome 8 steps RGB picture by OSD_IC
Setting up the selector:
V MUTE H
FULL OSD H
V SEL L
Adjustment
q
RGB AMPLITUDE (RGB Amplitude control)
Sampling the LCD_G voltage value at the 2nd step, and ad-
just to the adaptation value. (V_MUTE: H)
Positive/negative appraisal at the 2nd step is run at 43H,
and sampling is run between 44H and 53H.
q
Starting with the OSD_VSYNC pulse leading edge,
count the OSD_HSYNC pulse until a positive/nega-
tive appraisal at 43H of the 2nd step.
w
Check to see if VCOM_IN pulse at 43H is above or
below 1.6V.
e
-1 If VCOM_IN at 43H is below 1.6V, sampling VG volt-
age value b from 44, 46, 48, 50, 52 at 5H five times,
and sampling VG voltage value a from 45, 47, 49, 51,
53 at 5H five times.
e
-2 If VCOM_IN at 43H is below 1.6V, sampling VG volt-
age value a from 44, 46, 48, 50, 52 at 5H five times,
and sampling VG voltage value b from 45, 47, 49, 51,
53 at 5H five times.
(The timing of sampling is at 38.0
µ
sec
±
15 from the
leading edge of H)
r
Eliminate the maximum and minimum value from the
sampled voltage value a/voltage value b data (five
times), and calculate the average.
t
Calculate the VG amplitude by subtract averaged volt-
age value a from averaged voltage value b.
y
Change the RGB_AMPLITUDE setting on the value
from
t
and adjust to the adaptation value.
∗
Keep the above average voltage a for adjustment
wert
.
Adjustment
wert
BRIGHT, GAMMA1, CONT-RGB2, GAMMA2
Example: Sampling the voltage value at the 3rd step, and
adjust to the adaptation value.
Positive/negative appraisal at the 3rd step is run at 63H, and
sampling is run between 64H and 73H.
q
Starting with the OSD_VSYNC pulse leading edge,
count the OSD_HSYNC pulse until a positive/nega-
tive appraisal at 63H of the 3rd step.
w
Check to see if VCOM_IN pulse at 63H is above or
below 1.6V.
e
-1 If VCOM_IN at 63H is below 1.6V, sampling VG volt-
age value c from 65, 67, 69, 71, 73 at 5H five times.
e
-2 If VCOM_IN at 63H is above 1.6V, sampling VG volt-
age value c from 64, 66, 68, 70, 72 at 5H five times.
(The timing of sampling is at 38.0
µ
sec
±
15
µ
sec from
the leading edge of H)
r
Eliminate the maximum and minimum value from the
a
b
1.6V
GND
38.0
µ
sec
±
15
38.0
µ
sec
±
15
1.6V
VG
V COM
OSD HSYNC
b
ADJUSTMENT
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