19
D-107
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.
Wiring Diagram
Oscilloscope
50mV/div
or
20mV/div
0.2µs/div
or
0.5µs/div
Check Item
1. Playback the test disc.
2. Check HF level on the oscilloscope.
A=0.7V~1.3V
Eye-pattern
VH
3. Check that the wave-form is not deformed
(The center 2 shapes must be discernible.)
w
w
w
.
x
i
a
o
y
u
1
6
3
.
c
o
m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
To Next Page
Loading...
