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 the voltage supplied to the
mechanism. 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 mechanism. Table 2-1 shows the input voltages and
fuse ratings of the boards and Table 2-2 shows the PSB/PSE board output specifications.
Board
C204 PSB board
C204 PSE board
Item
Rated 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
* +37 V DC line maximum total current is 13.0 A.
Table 2-1. Power Supply Boards Input
Input Voltage
120 VAC
220-240 VAC
Table 2-2. Power Supply Board Output Specifications
+37 VDC Line
VP1 VP2
+37.0 VDC
35.5 - 37.5 VDC
1.5 A
0.0 - 4.5 A*
Yes
Turn the power switch off, then turn it on again.
Controlled by C204 main board with /PD signal.
Less than 1.0 A
Yes
Turn the power switch off, then turn it on again.
+42 VDC
OPERATING PRINCIPLES
Fuse Ratings
12 A /125 VAC
6.3 A / 250 VAC
+5 VDC Line
VP3
+5.0 VDC
4.75 - 5.25 VDC
2.0 A
0.0 - 5.0 A* 0.0 - 2.0 A
Yes
Automatically recovers.
Less than 1.0 A
Yes
Automatically recovers.
+7 VDC
2-13