Flicker Adjustment; Free-Run Frequency Adjustment - Kenwood KVT-719DVD Service Manual

1. Flicker adjustment

● Condition (As in the previous models)
Video source: VIDEO
Video: Luster white 30%~50%
BRIGHT: MAX
MODEL: ZOOM
● Adjustment procedure
q Display luster white 30%~50%
w Place a fl icker adjustment jig to the monitor and observe
the waveform with an oscilloscope.
e Turn VR*** and adjust to make the amplitude of the
waveform to minimum.
KVT: VR203, DDX: VR100
Oscilloscope range: 20mV, 0.5mS
(setting at the time of 04 commercial production)
● Note
q In checking the screen after the adjustment, move the
monitor up and down in order to confi rm that the screen
does not fl icker. (This check is also carried out on the 06
model.)
w Noise due to AC200V can be observed in the flicker
adjustment jig and oscilloscope and thus carefully set up
the power supply and GND of the jig and oscilloscope.
In 06 model, GND of the measurement equipment has
been fl oated.
ADJUSTMENT

2. Free-run frequency adjustment

● Adjustment procedure
q Press Auto Adjust on the Test Mode Main screen.
w Press FREQ on the Auto Adjust screen.
Completion of the procedure with "Auto Adjust OK"
DVD video signal is used as the reference signal for the
adjustment (15.734kHz).
DVD wall paper that is shown at the start of the TEST mode
is fixed to the NTSC display regardless of its destination.
Once a DISC is played, the wall paper turns into the display
mode of the destination.
(When the DVD video signal is in PAL mode, the adjustment
becomes NG.)
KVT-719DVD/729DVD
/729DVDY/739DVD
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