CPXD-350,500 SERVICE MANUAL
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2. Function of each printed circuit board (continued)
2.2 Operation of check terminal on printed circuit board
T : is measured by tester
S : is measured by oscilloscope
2.2.1 Check terminal on printed circuit board PC0056P
No.
Signal name
Explanation
CH1
0V
Ground
CH2
+ 5V
T: CH1-, CH2+ +5V
CH3
- 15V
T: CH1+, CH3- +15V
CH4
+ 15V
T: CH1-, CH4+ +15V
CH5
Feed quantity setting
T: CH1-, CH5+
Voltage changes between 5 from 1V according to current knob of
remote control.
CH6
SCR trigger 3
S: CH1-, CH6+
Pulse waveform such as the figure below.
CH7
SCR trigger 2
S: CH1-, CH7+
Pulse waveform such as the figure below. (Same as CH6)
CH8
SCR trigger 3
S: CH1-, CH8+
Pulse waveform such as the figure below. (Same as CH6)
CH9
Zero-cross 1
S: CH1-, CH9+
Pulse waveform such as the figure below.
CH10
Zero-cross 2
S: CH1-, CH10+
Pulse waveform such as the figure below. (Same as CH9)
CH11
Zero-cross 3
S: CH1-, CH11+
Pulse waveform such as the figure below. (Same as CH9)
CH12
Input voltage
T: CH1-, CH12+
When rated input voltage, become 2.6V(CPXD-350) and 4,0V
(CPXD-500).
It changes in proportion an input voltage.
CH13
Output current
T: CH1-, CH13+
Voltage changes between 10 from 0V according to output
current. Voltage is 10V when current is 1000A.
CH14
Current detection
T: CH1-, CH14+
When output current is detected, voltage is 0V and when it is not
so, 5V.
+15V
0V
60μs
10ms: 50Hz
8.3ms: 60Hz
+5V
0V
400μs
10ms: 50Hz
8.3ms: 60Hz
