Epson FX-870/1170 User Manual Page 144
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- Table of contents
- TROUBLESHOOTING
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Principles of Operation
Printhead Drive Circuit
The printhead drive circuit receives two types of signals: image data and the pulse length control
signals. Image data is created in the CPU, transferred to the gate array, and latched to the
printhead. The pulse length control signal is set by the CPU. The pulse length is adjusted referring
to the voltage of the +35 V line. These two types of signals are sent to the printhead to print each
dot. Figure 6-29 shows the printhead drive circuit.
+35VDC
CPU
(IC2Cl)
I
DO-7
DO-7
P51
P83
HPW
GA
(IC4)
HDP
HDNl
HDkl9
+35VDC
1
HEAD
Figure 6-29. Printhead Drive Circuit
Parallel Interface Circuit
The parallel interface circuit controls the data flow from the host computer. When
am
signal
is sent from the host computer, the data is latched into the gate array
(E05A66YA).
Data is
transmitted until a BUSY signal is sent back automatically to the host computer to stop the data.
Then, the gate array outputs an
B8’
signal to P82 (the interrupt signal port) of the CPU. The CPU
then reads the data latched into the gate array and, on completion
ofthe
reading, resets the BUSY
signal to enable the host computer to send more data. Figure 6-30 shows the parallel interface
circuit.
E05A55YA
(IC4)
CPU
(IC2Cl)
Parallel I/F
DO-7
STROBE
BUSY
+
DINO-7
DATAO-7
STB
IBF
--------
q-----------
I
I
I
I
I
----,,,,A
BUSY
DO-7
P82
Figure
6-30.
Parallel Interface Circuit
Epson FX-870/1170
6-29
- 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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