Power Supply Circuit; Roc Filter Unit - Epson LX-HOO Technical Manual

2.3 POWER SUPPLY CIRCUIT

This section describes the operation of the ROC filter unit
Figure 2-2 shows the block diagram of the power supply circuit. Table 2-1 shows output voltages and
their applications.
I
Power
1
I
I
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I
Power Voltage
+ 24 VDC-GP
+5 VDC-GND
+ 12VDC-GND
2.3.1
Filter Unit
The ROC filter unit consists of an AC power cord (or AC power inlet), power switch, fuse, filter circuit,
and power transformer. The AC power cord, AC power inlet, fuse, and power transformer differ
depending on the power supply voltage. Three kinds of ROC filter units, for 120 V, 220 V, and 240 V,
are available.
_ - _ .
1 I
I I
F i l t e r
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I
Power
Circuit
Trans-
I
I
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I
k -
Fig. 2-2. Power Supply Circuit Block Diagram
Table 2-1. Voltage Types and Applications
- - - - - - - - - -
F2
Full-Wave
Rectifier
Regulator
and
Smoothing Circuit
circuit
Rectifier
Circuit
— - . - - - - - - - - - - - - - - - - - - - A
Application
Printhead common voltage
Paper feed motor drive voltage
Carriage motor drive voltage
Optional interface board
Logic circuit
Paper feed motor hold voltage
Carriage motor hold voltage
Control panel power
Optional interface board
Optional interface board
Optional interface board
2-3
circuit on the ROCX board.
— - - - - - - - - - 7
.
I
I
— Switching ~ +
Regulator
Circuit
— 1
I
I
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I
I
O GP
5VOC
O 12VAC