Www Ao - Yamaha DVD-C900 Service Manual

DVD-C900
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Test Disc
Type
1. DVD disc
2. VIDEO-CD/CD-DA disc
Measurement Point Adjustment Point
JIT OUT Tangential ADJ. screw
(See page 14) Tilt ADJ. screw
Tilt ADJ. Screw
TE
L 13942296513
Use a hex. wrench (2.0mm)
JIT OUT (See page 14)
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After Adjusting Check the following
1. After adjusting by the DVD test disc, play a video CD or CD-DA and check that there is no abnormal operation.
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Test disc Part No.
DVDT-S01 TX946080
PVCD-K06 TX946090
Mode Test Disc
Play DVDT-S01
(title 8)
Pause
Tangential ADJ. Screw
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2 9
8
Measuring Equipment Adjustment Value
Oscilloscope Adjust untill the bottom section
DC 500 mV/div of the waveform becomes flat and
20 msec/div the DC components are minimum.
Adjustment Procedures
1. Play back the DVD test disc and then place the unit
in play mode with title 8, then push the Pause
button.
2. At first, Adjust Tangential Adjustment Screw then
adjust Tilt Adjustment Screw with the Hex Wrench
(2.0 mm) from bottom side.
Repeat 2 to 3 times alternately until the waveform
at JIT OUT indicated below is obtained.
Final adjustment should be Tilt Adjustment.
The valley sections of the waveform should be as
flat as possible.
The total DC level should be obtained minimized as
much as possible.
Q Q
3 6 7 1 3 1 5
The waveform whisker sections will not disappear.
OK
0V
NG
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0V
.
9 4 2 8
0 5 8 2 9 9 4 2 8
DC range
500mV/div
20msec/div
m
DC renge
500mV/div
20msec/div
9 9
9 9