Adjustment - Kenwood KVT-910DVD Service Manual

KVT-910DVD/920DVD/930DVD/
940DVD/960DVD
X14 DVD Image Adjustment Specification
1. Connection and
Measurement Locations
2. DVD Image Output Level Adjustment
q Put X14 in the image quality adjustment mode. (Set 1pin on
IC10 to "L". And 2 pin to "H.")
w The adjustment of image output level (composite signal) of X14
board is to be conduced while observing the waveforms at the
both end of X25 75Ω resistor, via mini-DIN cable.
∗ When conducting this, the 75Ω resistor should be changed
from ±5% resistor to ±1% resistor(precision resistor).
e For observing waveforms, the Waveform Monitor 5222
(Manufactured by LEADER) shall be used.
Input the composite signal into the Waveform Monitor(loop through) and press "Line Selector" button.
Then the line values are displayed on the monitor. Turn the"V.POS/REF" to "All 170."
r Then, press the "DC Rest" button (LED should light up.) and then press "Cursor" button. When the
"V.POS/REF" knob is turned in this conditoin, the waveform move up and down in vertical direction.
Adjust the pedestal level to 0IRE.
t Turn VR1 of X14 board and adjust so that 100% white signal will be 100IRE ± 21RE or less (one notch of
the fine scale in the center).
46

ADJUSTMENT

X14
CN201
6pin : Composite signal
7pin : VGND
120
100
80
60
Pedestal
40
20
0IRE
-20
-40
100IRE
J707
6pin : Composite signal
7pin : VGND
Mini DIN Cable (6m)
75Ω
AV
Driver
Chooser
Jig (X25)
Change 5% to1%,
Change!
WAVE FORM
MONITOR
5222
fig.1
1 notch is 2IRE
fig.2
75Ω