Epson FX 890 Service Manual - Page 27

Circuit Operation

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2.3 CIRCUIT OPERATION FX-1180/FX-880 Service Manual Chapter 2 Operating Principles 2.3.1 C229PSB/PSE/PSH Power Supply Circuit This printer can be powered by one of the following three power supply boards: the C229PSB (120V) board, the C229PSE (230V) board, or the C229PSH (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. The input voltages and fuse ratings are as shown in the following table: Table 2-1. Input Voltage and Fuse Rating Board C229PSB C229PSE C229PSH Input Voltage 85-138VAC 187-276VAC 85-276VAC Fuse F1 Rating 4A, 125V or 250V T2.0AH, 250V T4.0AH, 250V The power supply circuit outputs voltages used to drive the various control circuits and the mechanism, as shown in the following table: Table 2-2. Output Voltages and Applications F Output Voltage 5V 5% 0.7A (Type-B I/F output is included.) F 35V 6% 0.8A Applications Logic lines Detectors Panel Switches & LEDs CR Motor PF Motor Printhead 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 set in the secondary circuit that is controlled by the signal PSC from the control panel. A C L in e In p u t L in e F ilte r Z C - R C C S w itc h in g R e g u la to r - O v e r C u r r e n t p r o te c tio n - O v e r V o lta g e p r o te c tio n R e g u la to r IC +35V D C +5V D C PSC Figure 2-4. Power Supply Circuit Block Diagram Rev. B 2-4

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FX-1180/FX-880 Service Manual
Chapter 2 Operating Principles
Rev. B
2-4
2.3 CIRCUIT OPERATION
2.3.1 C229PSB/PSE/PSH Power Supply Circuit
This printer can be powered by one of the following three power supply boards: the C229PSB
(120V) board, the C229PSE (230V) board, or the C229PSH (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. The input
voltages and fuse ratings are as shown in the following table:
Table 2-1. Input Voltage and Fuse Rating
Board
Input Voltage
Fuse F1 Rating
C229PSB
85-138VAC
4A, 125V or 250V
C229PSE
187-276VAC
T2.0AH, 250V
C229PSH
85-276VAC
T4.0AH, 250V
The power supply circuit outputs voltages used to drive the various control circuits and the
mechanism, as shown in the following table:
Table 2-2. Output Voltages and Applications
Output Voltage
Applications
5V
5% 0.7A
Logic lines
(Type-B I/F output is included.)
Detectors
Panel Switches & LEDs
35V
6% 0.8A
CR Motor
PF Motor
Printhead
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 set in the secondary circuit that is controlled by the signal PSC from the control
panel.
L in e F ilte r
ZC
-R
C
C
S
w
itc h in g R
e g u la to r
A
C
L in e
In p u t
+35V
D
C
+5V
D
C
P
S
C
- O
v e r C
u r r e n t p r o te c tio n
- O
v e r V
o lta g e p r o te c tio n
R
e g u la to r IC
Figure 2-4. Power Supply Circuit Block Diagram