C524 Psb/Pse/Psh Power Supply Circuit - Epson 890N - FX B/W Dot-matrix Printer Service Manual

EPSON FX-890/2190

2.1.2.2 C524 PSB/PSE/PSH Power Supply Circuit

This printer can be powered by one of the following three power supply boards: the
C524PSB (120 V) board, the C524PSE (230 V) board, or the C524PSH (Universal)
board. The function of the 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.
CIRCUIT CONSTITUTION
Figure 2-6 below shows the block diagram of this power supply circuit.
Figure 2-6. Power Supply Circuit Block Diagram
Table 2-3. Circuit Constitution
Block
Input Filter
Inrush current preventive circuit with a power thermistor
42 V zero cross RCC of high performance
Constant-voltage detecting circuit of Tr+ZD type
ZC-RCC Converter
Low power standby mode function by the ESAVE signal is
supported
+5 V Circuit
Chopper circuit with a MOSFET discrete structure
Operating Principles
Description
Overview
INPUT SPECIFICATIONS
Table 2-4. Input Specifications
Power Supply Unit C524 PSB
Name (100-120V Spec)
Rated input power
100-120 VAC
voltage
Input voltage range 85-138 VAC
Rated input power
frequency
Input frequency range
(100 V / 120 V, 60 Hz) (220 V / 240 V, 50 Hz)
Input
current
Min. load 0.05 A / 0.05 A
(Only for
reference
Rated load 0.78 A / 0.69 A
1
* )
Max. load 2.30 A / 1.96 A
(100 V/120 V, 60 Hz) (220 V/240 V, 50 Hz)
Input
power
Min. load 2.1 W / 2.3 W
(Only for
reference
Rated load 45.5 W / 45.2 W
* 1 )
Max. load 153.3 W / 148.6 W
40 A (0-p) or less
(Input: 138 V/60 Hz)
Inrush current
(Ambient temperature: 25
0.25 mA or less
(Input: 100 V / 50 Hz)
0.75 mA or less
Leak current
(Input: 276 V / 60 Hz)
Output holding time (Input: 85 V/47 Hz)
(Output: Rated load/Ambient temperature: 25
Revision B
C524 PSE C524 PSH
(220-240V Spec) (100-240V Spec)
220-240 VAC 100-240 VAC
187-276 VAC 85-276 VAC
50-60 Hz
47-63 Hz
(100 V, 60 Hz
/240 V, 50 Hz)
0.05 A / 0.04 A 0.08 A / 0.08 A
0.41 A / 0.39 A 0.78 A / 0.42 A
1.18 A / 1.10 A 2.34 A / 1.18 A
(100 V, 60 Hz
/240 V, 50 Hz)
2.2 W / 1.6 W 3.6 W / 2.1 W
45.4 W / 45.4 W 47.1 W / 46.8 W
147.9 W / 146.7 W 159.7 W / 152.2 W
40 A (0-p) or less 40 A (0-p) or less
(Input: 276 V/50 Hz) (Input: 276 V/50 Hz)
°
C, At cold start)
0.75 mA or less 0.75 mA or less
(Input: 138 V / 60 Hz) (Input: 276 V / 60 Hz)
°
(Ambient temperature: 25 C)
43 ms or more
(Input: 187 V/47 Hz) (Input: 85 V/47 Hz)
°
C
50