Clear-Com PS-704 - Manual (Page 23)

P S - 7 0 4 F O U R - C H A N N E L P O W E R S U P P L Y
3 - 1
MAINTENANCE
INTRODUCTION
This chapter provides maintenance information including a block diagram and troubleshooting tips.
Caution: These servicing instructions are for use by qualified personnel only. To reduce the risk of electrical
shock, do not perform any servicing other than that contained in the operating instructions unless you
are qualified to do so.
PS-704 BLOCK DIAGRAM
The following is a block diagram of the PS-704:
Figure 3-1: PS-704 Block Diagram
PS-704
Voltage
Regulator
Power
Program
Trim
Program
Input
Channel A
Power
Controller
Channel A
Voltage
Sensor
Channel A
Current
Sensor
Channel B
Power
Controller
Channel B
Voltage
Sensor
Channel B
Current
Sensor
Ch B
Term Ch A
Term
Microprocessor
Overload
Channel
A
Overload
Channel
B
B
Send
Levels
A
Channel
B
Channel
A
Program
On / Off
A
B
Channel C
Power
Controller
Channel C
Voltage
Sensor
Channel C
Current
Sensor
Channel D
Power
Controller
Channel D
Voltage
Sensor
Channel D
Current
Sensor
Microprocessor
Overload
Channel
C
Overload
Channel
D
Channel
D
Channel
C
C
D
D
C
+30 VDC
+30 VDC
+30 VDC
+30 VDC
Ch D
Term Ch C
Term
+30 VDC +5 VDC
IEC
Power
Inlet
On/Off Switching
Power Supply
Module