Epson TM-T88II Series Manual de Instruções Página 48
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Rev. A Mechanisms and Operation 2-9
TM-T88 Series Technical Manual
Near end sensor mechanism
The near end (N.E.) sensor lever is supported by the N.E. sensor holder so it can move. The
spring force of the microswitch fixed by a screw to the N.E. sensor holder presses the N.E. sensor
lever in the direction of arrow (1) in Figure 2.4.9. The microswitch is linked to the switch circuit
board assembly-B by the N.E. sensor lead wire. The N.E. sensor holder is attached to the paper
guide by the sensor adjustment screw.
When the paper roll is larger than the prescribed roll paper diameter, the pressure of the outer
surface of the paper roll on the N.E. sensor lever causes the lever to press the microswitch,
maintaining it in an ON state.
When the remaining paper on the roll is below the prescribed diameter, contact between the tip
of the N.E. sensor lever and the paper roll surface is broken, causing the lever to move in the
direction of arrow (1), into the core of the paper roll. This causes the microswitch to turn off,
indicating near end of the roll paper.
The prescribed near end roll paper amount can be changed between two different levels: one
with the N.E. sensor tab fixed in a raised position, and one with the N.E. sensor tab fixed in a
lowered position.
Paper end sensor mechanism
A reflective type photosensor, which consists of an LED and phototransistor, is mounted on the
paper sensor board and located in the paper guide paper path. When the end of the roll paper
passes the sensor, the volume of light from the LED that makes it to the phototransistor changes.
Because the reflectance ratios of the paper and the rubber platen surface are different, a change
in the output level of the phototransistor is detected as the end of the paper.
Figure 2.4.9 Near end sensor mechanism
1
1
N.E. sensor
holder
Sensor
adjustment
screw
Core
Microswitch
Paper roll
N.E.
sensor
lever
Large diameter roll Small diameter roll
Core
Paper roll
- 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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