Circuit Operation; C229Psb/Pse Power Supply Circuit - Epson FX-880 Service Manual

2.3 CIRCUIT OPERATION

2.3.1 C229PSB/PSE Power Supply Circuit

This printer can be powered by either of two power supply boards: the C229PSB (120V) board or
the C229PSE (230V) board. The function of these two boards is the same , except for a difference
in the primary circuitry. The power supply outputs the DC current necessary to drive the printer
control circuit and drive the mechanism. The input voltages and fuse ratings for these boards are
as shown in the following table:
Board
C229PSB
C229PSE
The power supply circuit outputs voltages used to drive the various control circuits and the
mechanism, as shown in the following table:
5V•}5% 0.7A
(Type-B I/F output is included.)
35V•}6% 0.8A
The power supply circuit consists of the line filter circuit, ZC-RCC (Zero-Cross Ringing Choke
Converter) switching circuit and 5V chopper regulator IC. The AC voltage is first input to the line
filter circuit for higher harmonics absorption, then input to the switching circuit and transformed to
+35VDC. +5VDC is generated from +DC35V by the regulator IC. The over current / voltage
protection circuit is also designed on the board.
The power switch is set in the secondary circuit that is controlled by the signal PSC from the
control panel.
Rev. A
Table 2-1. Input Voltage and Fuse Rating
Input Voltage
85-138VAC
187-276VAC
Table 2-2. Output Voltages and Applications
Output Voltage
Figure 2-4. Power Supply Circuit Block Diagram
Chapter 2 Operating Principles
4A, 125V or 250V
Applications
Logic lines
Detectors
Panel Switches & LEDs
CR Motor
PF Motor
Printhead
FX-880 Service Manual
Fuse F1 Rating
T2.0AH, 250V
2-4