Kenwood LZ-702W Service Manual page 11

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.
Vertical/Horizontal timing (NTSC)
Blanking period
VD
HD
1
Horizontal display period (NTSC)
Horizontal direction
OSD HSYNC
VR
VG
VB
Horizontal display period (NTSC)
20H~39H
1st step
3.3V
VR
VG
VB
GND
VCOM IN
1.6V
GND
ADJUSTMENT
Sampling timing
1st step
20H~39H
10 20 30
µ
13 sec
µ
38.0 sec
40H~59H
3rd step
2nd step
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.
2nd step
40H~59H
40 50
µ
1H=63.55 sec
480 dots
µ
50.01 sec
Sampling
30.0µsec
Sampling enabling period
140H~159H
60H~79H
7th step
LZ-702W
NTSC Line
NORMAL MODE 20~253
1H 61H 121H 181H 241H 301H 361H 421H
~ ~ ~ ~ ~ ~ ~ ~
60H 120H 180H 240H 300H 360H 420H 480H
3rd step 8th step
60H~79H 160H~179H
60 180
160H~179H
8th step
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