Electrical Adjustment - Denon DVM-4800 Service Manual

5.5. Electrical Adjustment

Do this confirmation after replacing a P.W.B.
5.5.1. Video Output (Luminance Signal)
Adjustment
Measurement Adjustment
Point Point
Video Output VR3225
Pin Terminal
GND: Chassis
Measuring Device
Oscilloscope
500 mV/div, 10 µs/div
For compatibility of video signal output.
1. Connect the monitor TV to the video output terminal and
terminate at 75 Ohms.
2. Play back the color bar part title 9 (DVDT-S20) of the DVD
Test Disc title.
3. Adjust the VR3225 so that the luminance signal output is as
shown below.
Adjustment Value = 1000
Fig. 5-5-1 Luminance Signal Output
Mode Disc
Playback DVDT-S20
(Color Bar) (title 9)
Adjustment Value
1000 ± 20mV p-p
20 mV p-p
5.5.2. Video Output (Chrominance
Signal) Adjustment
Measurement Adjustment
Point Point
Video Output VR3221
Pin Terminal
GND: Chassis
Measuring Device
Oscilloscope
500 mV/div, 10 µs/div
For compatibility of video signal output.
1. Connect the monitor TV to the video output terminal and
terminate at 75 Ohms.
2. Play back the color bar part title 9 (DVDT-S20) of the DVD
Test Disc title.
3. Adjust the VR3221 so that the chrominance (CYAN) signal
output is as shown below.
Adjustment Value = 624 12 mV p-p
Fig. 5-5-2 Chrominance Signal Output
DVM-4800
Mode Disc
Playback DVDT-S20
(Color Bar) (title 9)
Adjustment Value
624 ± 12mV p-p
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