Power Supply Operation - Epson DFX-8500 Service Manual

2.2 POWER SUPPLY OPERATION

The printer can be powered by either of two power supply boards: the 120 V C204 PSB board or the 220/240
V C204 PSE board. The only difference in the operation of these two boards is in the primary circuitry. They
supply power to the printer in the same way. The power supply board outputs the DC current required to drive
the control circuits and printer drive mechanism. Table 2-1 shows the input voltages and fuse ratings of the
boards and Table 2-2 shows the PSB/PSE board output specification.
Board
C204 PSB board
C204 PSE board
Item
Rating Output Voltage
Available Output
Voltage Fluctuation
Rating Output Current
Available Output
Current Fluctuation
Over Current Protection
Over Current Protection
Reset Method
Short Circuit Current
Over Voltage Protection
Over Voltage Protection
Reset Method
Over Voltage Limit Value
*1): +37 V DC line Maximum in total is 13.0 A.
Rev. B
Table 2-1. Power Supply Boards Input
Input Voltage
120 VAC
220-240 VAC
Table 2-2. Power Supply Board Output Specification
+37 VDC Line
VP1
+37.0 VDC
35.5 - 37.5 VDC
0.0 - 4.5 A*1)
Turn the power switch off, then turn it again. Or
controlled by C204 MAIN board with /PD signal.
Less than 1.0 A
Turn the power switch off, then turn it again.
42 VDC
Fuse Ratings
12 A /125 VAC
6.3 A / 250 VAC
VP2 VP3
1.5 A
0.0 - 5.0 A*1)
Yes
Yes
OPERATING PRINCIPLES
+5V DC Line
+5.0 VDC
4.75 - 5.25 VDC
2.0 A
0.0 - 2.0 A
Yes
Automatically recovered.
Less than 1.0 A
Yes
Automatically recovered.
7 VDC
2-13