Epson TM-T88II Series Manual de Instruções Página 65
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2-26 Mechanisms and Operation Rev. A
Cover open sensor circuit
The cover open sensor is located next to the thermal printer mechanism, and it is connected via
switch circuit board assembly-B to the main circuit board unit-A. Detector signal R_COVER is
input to the CPU (U4).
Near end sensor circuit
The near end sensor is located next to the thermal printer mechanism and the roll paper holder.
It is connected via switch circuit board assembly-B to the main circuit board unit-A. Detector
signal RNE is input to the CPU (U4).
Control Panel Control Circuit
This control panel is located on switch circuit board assembly-B. It has three LEDs (POWER,
ERROR, RECEIPT OUT) and one switch (FEED). The POWER LED drives when +5V is supplied by
the power circuit. The ERROR and RECEIPT OUT LEDs are controlled by the CPU (U4). Switch
sensing is performed by the CPU (U4) (switch sensing signal is input to CPU port).
DIP Switch Read Circuit
There are a total of 14 DIP switches in banks DSW1 (switches 1 to 8) and DSW2 (switches 1 to 6).
Low level is read when a switch is ON and high level is read when a switch is off.
Malfunction Protection Circuit
The malfunction protection circuit protects against continuous energizing of the printer
mechanism due to runaway processing by the CPU, etc. The following are the causes to activate
the malfunction protection circuit:
❏ Output of the WDTOUT
signal due to runaway processing by the CPU.
❏ Output of SW24V_2 signal from the gate array (U5) due to runaway processing by the CPU.
❏ TIMI signal output when abnormal continuous output to paper feed motor drive circuit is
detected.
❏ TIMI signal output when print head temperature is abnormally high.
When any of the above triggers occurs, power supply to the printer mechanism is turned off (Q5
OFF) in order to protect the printer mechanism.
Drawer Kick Control Circuit
Signals DKD1 and DKD2 from gate array (U5) going active cause transistors Q7 and Q6 to turn
on, which in turn turns on transistor array QM1, outputting the drawer drive signal. The DK_S
signal, which indicates whether or not the drawer is open, is input to the CPU (U4), and this
status can be obtained from the host interface. The drawer power supply of +24V is supplied via
the regulator IC (U8), and the power supply is cut whenever over current or over duty occurs.
- 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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