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REV.-A
2.3 OPERATION OF THE POWER SUPPLY CIRCUIT
The power circuit used in the printer is either a 120V SEIPS board (for the U.S., Taiwan, and the Middle
East) or a 2201240V SANPSE board (for Europe, Oceania, and Southeast Asia). The basic operation
of both boards is the same, however, and they are treated as one in this manual.
2.3.1 Power Supply Circuit Block Diagram
Figure 2-5 shows the power supply circuit block diagram.
The SEIPS board uses a forward-converter type switching regulator circuit, and outputs +5, +24, and
+
12 V DC.
The incoming AC power passes first through a noise filter, then through a full-wave rectifying circuit.
The power then passes into the main switching circuit, which outputs +24V and
±
12V DC.
Stabilization is provided by an over-voltage limiting circuit located on the 24V line, which feeds back
to the main switching circuit. The 24V line is also used to generate the 5V output.
23V
-12VDC
+5VDC
+24VDC
Gl
GP
'+12VDC
F 1
~
---
~
-
r--
r - - -
v---<..J
~
FllTER
FUll-WAVE
SMOOTHING
CIRCUIT
RECTIFIER
CIRCUIT
~
CIRCUIT
.....,
~
~
~
L....-
~ [
HALF-WAVE
~
MAIN
RECTIFIER
-
SWITCHING
and
CIRCUIT
SMOOTHING
,....
-
CIRCUIT
.....,
[
HALF-WAVE
~
RECTIFIER
+5V
-
and
REGULATOR
SMOOTHING
CIRCUIT
,....
CIRCUIT
....,
limit 6V
~
~
-
OVER VOLTAGE PROTECTION
limit 29V
limit
AC
IN
OVER VOLTAGE PROTECTION
Figure
2-5.
Power Supply Circuit Block Diagram
2-11
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