Denon DVD-3800 Service Manual page 85

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MEASURING METHOD AND WAVEFORMS
To check the waveforms on the Servo P.W.B., the GND ( ) probe of the oscilloscope to Vref point.
(Except for Inner SW, TRVSW)
* For ~ , connect the GND (−) probe to "GND".
&
NOTES
Measuring Disc:
(It is better to use wires for extending between the probe and test points.)
When watching the HF waveform, use the extending wire as short as possible.
When HF waveform is noisy or cannot discriminate the eye-pattern, replace the Traverse Unit after measuring the Iop.
~ points have the certain test points shown below.
1
8
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56
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32
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DVD/DVDT-S01 or TDV-520A
CD/TCD-784
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15
60
61
80
1
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24
40
1
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Main P.W.B. Unit Foil Side
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8
7 14 15 3
1
28
32
1 8
4 5
1
41
40
15 1
Q Q
3 6 7 1 3
21
1
20
21
20
20
75 51
50
76
26
100
1 25
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18
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2 9 9 4 2 8
12
17 7
18
6
1
28 40
29 39
17
16
1 5 0 5 8 2 9 9 4
40
8 14
7 1
21
11
1
12
48
24
37
25 36
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19 20
DVD-3800
9 9
10
13
2 8 9 9
11
6
1
16
85