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LZ-702IR
11
ADJUSTMENT
●
Freerun frequency adjustment (X35-)
Adjustment procedure: Connect the display as required
q
In order to set NHD (pin 22) entry to null on the timing
controller (IC3) either open the composite signal on
JTP907 of J900 or change to full OSD screen.
w
Measure the HSY frequency which is output from TP3
located close to the NDSH (pin 9) of the timing controller
(IC3) using frequency counter and adjust to 15.734kHz
±
0.01kHz at VR3.
●
DC-DC Oscillation frequency adjustment (X35-)
Adjustment procedure
After checking the signal frequency for TP513 (SW8V power
supply) using the frequency counter, turn VR500 and adjust
to 242kHz
±
1kHz.
●
γ
Curve auto adjustment (X35-)
γ
Curve adjustable screen
When
γ
curve auto adjustment is ran,
enter the signal below and adjust by OSD.
Line
RGB Level Value
1step 20~39
(0,0,0)
2step 40~59
(36,36,36)
3step 60~79
(73,73,73)
4step 80~99
(109,109,109)
5step 100~119
(146,146,146)
6step 120~139
(182,182,182)
7step 140~159
(219,219,219)
8step 160~179
(255,255,255)
Line up the same
value shown above
starting from the left.
1H 61H 121H 181H 241H 301H 361H 421H
~
~
~
~
~
~
~
~
60H 120H 180H 240H 300H 360H 420H 480H
Vertical/Horizontal timing (NTSC)
VD
HD
Blanking period
3rd step
60H~79H
2nd step
40H~59H
1st step
20H~39H
8th step
160H~179H
10
1
20
30
40
50
180
60
Horizontal display period (NTSC)
Horizontal display period (NTSC)
1st step
2nd step
3rd step
8th step
1H=63.55
µ
sec
50.01
µ
sec
13
µ
sec
480 dots
38.0
µ
sec
40H~59H
60H~79H
140H~159H
160H~179H
Sampling
30.0
µ
sec
Sampling enabling period
7th step
VCOM IN
GND
1.6V
VR
VG
VB
GND
3.3V
Sampling timing
NTSC
Line
NORMAL MODE 20~253
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