Epson LQ-570e - Using the Push Tractor

EPSON LQ-580 Revision C
O
perating Principles
C
ircuit Operation
5
0
2.3 Circuit Operation
2.3.1 C293PSB/PSE Power Supply Circuit
This printer can be powered by either of two power supply boards: the C293PSB (120V)
board or the C293PSE (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:
The power supply circuit outputs voltages used to drive the various control circuits and the
mechanism, as shown in the following table:
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.
Figure 2-4. Power Supply Circuit Block Diagram
2.3.2 Input and Output Specification
o Input
Table 2-1. Input Voltage and Fuse Rating
Board Input Voltage Fuse F1 Rating
C293PSB 85-138VAC 4A, 125V or 250V
C293PSE 187-276VAC T2.0AH, 250V
Table 2-2. Output Voltage and Applications
Output Voltage Applications
5V±5% 0.7A
(Type-B I/F output is included.
Logic lines
Detectors
Panel Switches & LEDs
35V±6%1.0A CR Motor
PF Motor
Printhead
Table 2-3. Input Specifications
Item 100-120V Model 220-240V Model
Power Supply Unit C293PSB C293PSE
Rated Input Voltage 100-120V AC 220-240V AC
Input Voltage Range 85-138V AC 187-276V AC
Rated Input Frequency 50-60 Hz
Input Frequency Range 47-63Hz
Input Current (Reference Value *1)
Secondary Side: When SW-OFF
Minimum Load
Rated Load
Maximum Load
(100V/120V, 60Hz)
0.01A / 0.02A
0.06A / 0.06A
0.84A / 0.73A
2.32A / 2.01A
(220V / 240V, 50 Hz)
0.04A / 0.04A
0.05A / 0.05A
0.43A/ 0.4A
1.16A / 1.07A
Input Current (Reference Value *1)
Secondary Side: When SW-OFF
Minimum Load
Rated Load
Maximum Load
(100V/120V, 60Hz)
0.3W / 0.3W
2.0W / 2.6W
47W / 47W
149W / 150W
(220V / 240V, 50 Hz)
0.5W / 0.6W
2.2W / 2.4W
47W / 47W
146W / 145W
AC Line
Input
Line
Filter
ZC-RCC Converter
-Over Current Protection
-Over Voltage Protection
-Energy Saving on Standby Mode
-Secondary side SW
Regulator
IC
AC
Input
+35V/
1.0A
+5V/
0.7A
PSC
signal
POFF
signal
Output