Denon DVM-4800 Service Manual page 17

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5.5. Electrical Adjustment
Do this confirmation after replacing a P.W.B.
5.5.1. Video Output (Luminance Signal)
Adjustment
Measurement Adjustment
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
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Fig. 5-5-1 Luminance Signal Output
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Mode
Point
Playback DVDT-S20
(Color Bar)
Adjustment Value
1000 ± 20mV p-p
20 mV p-p
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5.5.2. Video Output (Chrominance
Signal) Adjustment
Measurement
Disc
Point
Video Output
(title 9) 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
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Adjustment
Mode
Point
VR3221 Playback
(Color Bar)
Adjustment Value
624 ± 12mV p-p
12 mV p-p
1 5 0 5 8 2 9 9 4
Fig. 5-5-2 Chrominance Signal Output
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DVM-4800
9 9
Disc
DVDT-S20
(title 9)
2 8 9 9
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