Denon D-107 Service Manual page 19

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3. How to Check HF Level
(1) Measuring instruments required
a) Oscilloscope
b) Test disc: TCD-784 (A-BEX) or Mozart (CO-74176)
(2) Attaching connection wire for checking HF level
a) Disassemble 1U-3398-1 (Main PWB) → Refer to "DISASSEMBLY" on page 3, 4.
b) Solder wires to RF and VC test points for connecting the probe of oscilloscope.
(Length of the wires should be less than 20 cm) → Refer to 1U-3398-1 drawing on page 32.
c) Assemble 1U-3398-1, see the diagram below.
TE
L 13942296513
Oscilloscope
V
50mV/div 0.2µs/div
or
20mV/div 0.5µs/div
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H
1. Playback the test disc.
2. Check HF level on the oscilloscope.
or
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y Eye-pattern
i
3. Check that the wave-form is not deformed
(The center
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Wiring Diagram
Q Q
3 6 7 1 3 1 5
Check Item
A=0.7V~1.3V
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shapes must be discernible.)
9 4 2 8
0 5 8 2 9 9 4 2 8
m
D-107
9 9
9 9
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