Epson TM-T88II Series Manual de instrucciones Pagina 64
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Rev. A Mechanisms and Operation 2-25
TM-T88 Series Technical Manual
Reset from the host interface differs in accordance with interface specifications, as shown below.
RS-232C interface specifications
Selection between two signals (DSR signal or PIN 25 input signal) is possible.
1284 parallel interface specifications
Always use the #25 RESET signal. DIP switch 2-8 is always on. With the 1284 parallel interface,
this printer can be reset from the host interface signal’s nInit signal (PIN 31).
M-T88 Control Circuit
Thermal head drive circuit
The print head of the receipt printer mechanism is a thermal type print head with 512 dots per
line. All print head control is performed via a gate array. A driver is built into the print head,
and sending of print signal RSI, which is synchronized with the RSCKL signal, to the driver sets
the print/non-print status of each dot. Data is confirmed by latch signal RLT. Print time control
is performed by RSTB1 and RSTB2, while energizing time is controlled by the gate array.
Changes in head temperature causes fluctuation of the resistance value of the thermistor built
into the head, which is output as temperature signal THR. This signal is read by the analog port
of the CPU (U4).
Paper feed motor drive circuit
The paper feed motor has a precise angle of rotation (highly precise movement amount), and
allows control of motor speed. When RPFCOM signal of the CPU (U4) goes H, +24V are applied
to the COM terminal of the paper feed motor coil, and RPF_+A, RPF_-A, RPF_+B, and RPF_-B
change between H and L. The H/L change speed of RPF_+A, RPF_-A, RPF_+B, and RPF_-B
determines the speed of the motor. RPFCOM signal of the CPU (U4) changes back to L after the
paper feed operation is complete.
Auto cutter drive circuit
The auto cutter drive uses a TA8428K DC motor dedicated IC. Signals AC_1 and AC_2 from the
CPU (U4) performs clockwise and counterclockwise operation, and braking of the auto cutter.
Detector circuits
Paper end sensor circuit
The thermal printer mechanism is equipped with a paper end sensor, which is connected via
switch circuit board assembly-B to the main circuit board unit-A. The paper end sensor is
enabled when the PTLED_COM signal output from the CPU (U4) is on, and paper end signal
RRE is input to the CPU’s analog port.
AC_1 AC_2 Operation
LLOff
HL Clockwise
L H Counterclockwise
H H Brake
- TM-T88 Series 1
- SEIKO EPSON CORPORATION 4
- Modular type connectors 5
- FCC CLASS A 5
- Introduction 6
- WARNING: 7
- Revision Sheet 8
- Contents 9
- Rev. A vii 11
- Chapter 1 13
- Printing Specifications 14
- Character Specifications 15
- Auto Cutter 15
- Paper Roll Supply Device 16
- Paper Specification 16
- Printable Area 17
- Internal Buffer 18
- Electrical Specifications 18
- Reliability 19
- Environmental Conditions 20
- Connectors 21
- Power Supply Connector 22
- CAUTIONS: 24
- RS-232 serial interface 25
- (continued) 27
- Reset switching 29
- Reset DC characteristics 29
- Buttons and Switches 30
- Panel Button 31
- DIP Switches 31
- Transmission speed 32
- DIP switch 2 32
- Print density selection 32
- For parallel interface model 33
- DIP switch 1 33
- DIP switch 2 33
- Panel LED 34
- Self-test 35
- Hexadecimal Dump 35
- Paper Sensors 36
- Standard Accessories 37
- Consumables 38
- Input specifications 39
- Output specifications 39
- Chapter 2 40
- Circuit Block Diagram 41
- Memory Map 42
- M-T88 Printer Mechanism 43
- Head holding mechanism 44
- Paper feed operation 45
- Thermal head 46
- Paper guide 46
- Frame cover 46
- Main frame 46
- Paper Supply Mechanism 47
- Near end sensor mechanism 48
- Paper end sensor mechanism 48
- Photosensor 49
- Shield plate 49
- Main frame (bottom) 49
- Data input and printing 50
- Cutter Mechanism 51
- Stationary blade mechanism 52
- Movable blade mechanism 52
- Auto cutter operation 53
- Cutter blade knob 53
- Cover Mechanism 54
- Cover open sensor mechanism 55
- Display Mechanism 56
- Display panel 57
- Switch board assembly-B 57
- Push-button 57
- RAM (1M bit) 60
- ROM (2M or 4M bits) 61
- Gate array 61
- Reset circuit 63
- AC_1 AC_2 Operation 64
- HL Clockwise 64
- L H Counterclockwise 64
- H H Brake 64
- Control Panel Control Circuit 65
- DIP Switch Read Circuit 65
- Drawer Kick Control Circuit 65
- Power Supply Circuit 66
- I/F Circuit Board Assembly 67
- Switchboard B 67
- Chapter 3 68
- Printer cover 69
- Control panel 69
- Cutter cover 69
- Cover open button 69
- Loading roll paper 70
- Figure 3-2 72
- Detector screw 73
- Detector lever 73
- Other hole 73
- Problem Solving 74
- CAUTIONS: 75
- Maintenance Procedures 76
- Thermal element 77
- Radiation plate 77
- Print circuit board 77
- Chapter 4 80
- Troubleshooting Flowcharts 81
- POWER does not turn on 82
- PAPER OUT LED does not light 83
- ERROR LED is lit 84
- 4 ERROR LED is flashing 85
- Approx. 160 msec 88
- Using This Manual 92
- Roll paper cover 93
- Cover-thermal-AA 93
- Case-lower-AA block 94
- IC cover 94
- CCS-tite M3x8 94
- Cover-cutter-AA 96
- Case-lower-AA 98
- Mechanism 99
- CPS-tite (O) M3x6 99
- Plate-mechanism 99
- CAUTION: 100
- CAUTION: 102
- Hook part 104
- Switch circuit board 106
- CBS-tite 106
- Cover-frame assembly block 107
- Auto cutter unit block 108
- Paper guide unit block 111
- Cable of pape 112
- Lever-cover open 114
- Tabs on frame assembly 116
- Groove of thermal head 116
- Motor-paper feed-receipt 117
- Frame assembly 118
- Motor (+) Terminal Red 122
- Motor (-) Terminal Black 122
- Microswitch Terminal White 122
- Appendix 127
- Reverse mode 128
- Printer status and signals 129
- RS-485 Serial Interface 131
- Appendix A-8 Rev. A 134
- XON/XOFF Transmit Timing 135
- Data Format When Using RS-485 135
- Printer reception data level 136
- Rev. A Appendix A-11 137
- Appendix A-12 Rev. A 138
- Rev. A Appendix A-13 139
- Appendix A-14 Rev. A 140
- Rev. A Appendix A-15 141
- Appendix A-16 Rev. A 142
- Rev. A Appendix A-17 143
- Case Unit Parts Name List 144
- Rev. A Appendix A-19 145
- Appendix A-20 Rev. A 146
- Overall Exploded Diagram 147
- Rev. A A-22 148
- M-T88 Printer Mechamism 148
- Lubrication Points Diagram 149
- Circuit Board Diagram 150
- RS-232 Interface Board 151
- IEEE 1284 Interface 152
- RS-485 Interface Board 153
- Rev. A A-28 154
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