Epson FX-870/1170 User Manual Page 134
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Principles of Operation
Power Supply Operation
The FX-870/1170 printer is powered by a 120 VAC power supply board (C076 PSB board assembly).
This board outputs the DC current necessary to drive the printer control circuits and the printer
drive mechanism. Fuse
Fl(2.5
A/125 V) is used to protect the power supply circuit of the board
in case of a short circuit.
Table 6-3. Power Supply Input Voltage and Fuse Rating
Input Voltage
Fuse
Fl
Rating
103.5
-
132 VAC
2.5
A/l25
V
Power Supply Overview
The power supply board has two power output lines that supply power to the control circuits and
the drive mechanisms.
Table 6-4 lists the components (parts or assemblies) of the printer that are
powered by these two DC voltages.
Table 6-4. Power Supply Output Voltages and Applications
I
Output Voltage (DC)
Applications
+35
v
CR (carriage) motor drive
PF (paper feed) motor drive
Printhead drive
+5
v
Main control board logic circuitry
Sensors
Control panel
LEDs
PF (paper feed) motor hold
Power Supply Circuit Operation
Figure 6-22 shows the power supply circuitry in block diagram form. When AC power enters the
printer from an external power source, the filter circuit removes the noise. The AC voltage then
undergoes full wave rectification and is smoothed to produce direct current. The voltage is then
fed through the switching circuit and the secondary smoothing circuit to produce a stepped down
+35
VDC voltage. A
+35
VDC detector circuit is connected to the switching circuit. This feedback
control arrangement ensures a stable
+35
VDC voltage supply.
A +5 VDC voltage is generated by feeding the +35 VDC voltage through the
+5
VDC power supply
circuit, where the
+35
VDC is stepped down to a stable
+5
VDC voltage. The switching regulator
IC containing the overcurrent/overvoltage control circuits performs this function. It controls the
+5
VDC line output.
.
Epson FX-87011170
6-19
- FX-870/1170 1
- FCC Compliance Statement 2
- Copyright Notice 3
- Trademarks 3
- Precautions 4
- How to Use this Manual 5
- EptmnFX-870/1170 6
- Numbers and Addresses 7
- Contents 8
- Removing the Panel Unit 9
- Printer Features 10
- List of Figures 11
- List of Tables 11
- 80-column model 14
- 136-column model 14
- Hardware Specifications 15
- FX-8700170 20
- 0.12” (3.0 mm) or more 22
- EpsonFX-870/1170 22
- Epson FX-8700170 24
- Interfaces 25
- Control Panel 29
- Default Settings 32
- Position 1 (3rd step) 37
- Printer Initialization 38
- Table 1-21. Buzzer Functions 39
- Main Components 40
- ,,DAld-lfil-l 41
- Epson FX-87011170 42
- Housing Assembly 44
- Chapter 2 48
- Site Requirements 49
- The Correct Power On Sequence 49
- Parallel Cables 50
- Serial Cables 50
- Serial Cable 51
- Tips to Increase Printer Life 52
- Troubleshooting 53
- Troubleshooting 3 54
- Table 3-2. Sensor Test Points 55
- Error Codes 58
- Problem Isolation 59
- Serial Communications Errors 60
- Possible Cause 61
- 3-10 Epson 63
- Self-Test 66
- Chart 6. Data 68
- Host is Printed Incorrectly 68
- FX-870/i 70
- Connector Locations 71
- Sensor Locations 72
- Figure 3-5. Platen Gap Sensor 73
- Disassembly and Assembly 78
- Disassembly and Assembly 4 80
- Service Checks After Repair 81
- Screw Specifications 82
- Removing the Printhead 86
- Removing the 87
- Insertion 93
- Printer Mechanism 97
- Arranging the Cables 100
- Disassembly 103
- Assembly 103
- Epson FX-870/1170 103
- Adjustments, Maintenance, and 105
- Lubrication 105
- Platen Gap Adjustment 106
- Preventive Maintenance 110
- Table 5-2. Lubrication Points 111
- Principles of Operation 113
- Carriage Mechanism 118
- Paper Handling Mechanisms 120
- Ribbon Advance Mechanism 133
- Power Supply Operation 134
- Pfinciples of Operation 135
- Secondary 136
- Control Circuit Operation 137
- E05A66YA (IC4) 139
- FX-87W1170 139
- Sensor Circuits 141
- Carriage Motor Drive Circuit 142
- Printhead Drive Circuit 144
- Parallel Interface Circuit 144
- PROM Control Circuit 145
- CH1=50V TIME=2ps 146
- Reference Materials 153
- Reference Materials 7 154
- Circuit Diagrams 158
- Circuit Diagram 159
- C076 PSB Power Supply Board 160
- CO76 PSB Power Supply Board 161
- Figure 7-6 162
- Figure 7-7 163
- Outline Drawings 166
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