Kenwood KVT-627DVDY Service Manual page 37

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2. OSD (On Screen Display) Clock and
OSD_HSYNC Phase Adjustment (X14: VR361)
Condition
Set video source: VIDEO
Input: Video of NTSC (Video: Color bar)
Screen mode: NORMAL
Adjustment Procedure
1. When started up in Test Mode, it will start up with VIDEO
source (FULL).
Menu screen ↔ VIDEO can be switched with [F] key.
2. In the VIDEO screen, press Screen MODE switching key
and switch to NORMAL screen.
TE
L 13942296513
Fig. 1 CH1 HSYNC, CH2 OSD_CLK
variable resistor center
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.
ADJUSTMENT
VR variable range
IC400 11pin
HSYNC
IC400 2pin
OSC IN
VR361
x ao u163
y
i
2 9
8
3. Refer to Figure 1.
Monitor IC400 11pin TP402 (HYSNC) and IC400 2pin TP403
(OSC IN) with an oscilloscope.
Trigger with HSYNC.
When the waveform cannot be accurately monitored due to
lack of oscilloscope capability and/or probe capacity, use
HSYNC: TP404 and OSC_IN: TP405.
In that case, the wave oscillation width will be smaller.
4. As shown in Figure 2, adjust so that the difference between
rising edge of HSYNC and the rising edge of OSD_CLK,
when its L-period is long, would be 16.0±5nsec.
Q Q
3 6 7 1 3 1 5
Fig. 2 CH1 HSYNC, CH2 OSD_CLK (Enlarged)
co
.
KVT-627DVD/627DVDY/717DVD
KVT-737DVD/747DVD/767DVD
9 4 2 8
0 5 8 2 9 9 4 2 8
16.0nsec
m
9 9
9 9
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