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4-5. Detectors
(1) Print head temperature detectors
The A/D converter in the CPU detects the print head temperature at power on and before each line begins to print.
Fig. 2-8 Printer head temperature detector circuit
Control Method
Error stop (thermistor open) 0-5 0.00 -
Normal print 6-213 0.00-4.35 ~120
Unidirectional print 214-221 4.35-4.48 120-130
Print stop 222-251 4.48-4.83 Over 130
Error stop (thermistor closed) 252-255 Over 5.00 -
(2) Home Position Detector
A photo-interrupter is used in the home detector on the printer.
ON/OFF signals are generated according to the position of the carriage. (Shield plate mounted at the base of the
carriage.) The printing position is determined by these signals.
Fig. 2-9 Carriage home position detector circuit
Control Method
Output (V) Decision
5 in home position (with shield plate)
0 not in home position (without shield plate)
+5V +5V
Printer head
Thermistor
CPU
V
ref
AN0
R2
R1
+5V
R2
R1
C1
R3
+5V
Detecting
signal
Temperature
°C
A/D Conversion Value
POINT
AN Voltage
V
Print
- DOT MATRIX PRINTER 1
- INTRODUCTION 3
- CHAPTER 1 5
- GENERAL SPECIFICATIONS 5
- 1. General Specifications 7
- Weight 16.1lbs/7.3kg 8
- Fig. 1-4 Front cover removed 10
- 3. Control Panel 11
- 3-2. EDS Mode Settings 12
- 4. Parallel Interface 13
- 5 Serial Interface (optional) 14
- 5-3. DIP Switch Settings 15
- 6. EE-PROM mode 16
- 6-3. EE-PROM MP 17
- 6-4. Rewriting the EE-PROM 20
- CHAPTER 2 21
- THEORY OF OPERATION 21
- 2. Main Logic Board 24
- 3. Power Supply Circuit 25
- 4. Mechanism 26
- Gear of The Clutch Lever 28
- Idler Gear 28
- Cassette Gear 28
- 4-4. Paper Feed Mechanism 29
- 4-5. Detectors 30
- CHAPTER 3 33
- ADJUSTMENTS 33
- CHAPTER 4 37
- PARTS REPLACEMENT 37
- 1. Front Case Unit 39
- 2. Rear Case Unit 39
- 3. Ribbon Holder 40
- 4. Printer Mechanism 40
- 5. Main Logic Board Unit 41
- 6. Power Supply Unit 41
- 7. Print Head 42
- 9. Tractor Unit 43
- 10. Carriage Motor Assy 44
- 11. Carriage Unit 44
- 12. Paper Feed Roller Assy 45
- 13. Frame Holder 45
- 14. Paper Guide Assy 46
- 15. Platen Assy 46
- 16. Paper Feed Motor Assy 47
- 17. Paper Path Change Plate 47
- 18. Detector 48
- CHAPTER 5 49
- MAINTENANCE AND LUBRICATION 49
- 1-1. Cleaning 51
- 1-2. Checks 51
- 2. Lubrication 52
- CHAPTER 6 57
- TROUBLESHOOTING 57
- 1. Troubleshooting Procedures 59
- 3. Repair by Unit Replacement 61
- CHAPTER 7 73
- PARTS LIST 73
- 1. Printer Assembly 74
- 1-2. Parts List 75
- 2. Printer Mechanism 76
- 2-2. Parts List 77
- Printer Mechanism 78
- 3. Sub - Assembly 79
- 3-2. Front Case Unit 80
- 3-4. Tractor Unit 82
- 3-5. Carriage Unit 83
- 3-6. Frame Base Assy 84
- 3-7. Frame L Unit 85
- 3-8. Frame R Unit 86
- 4. Wiring Scheme of Printer 87
- 5. Electrical Parts 88
- 5-1-2. Component Layout 90
- 5-1-3. Parts List 92
- Main Logic Board 92
- 5-2. Control Panel Board 95
- 5-3. Connected Board 96
- 5-4. Power Supply Unit 97
- 5-4-2. Component Layout 98
- 5-4-3. Parts List 99
- 6-1. Wiring Scheme 101
- 6-2. I/F Board 102
- 6-3. CPU Board 103
- 6-3-2. Component Layout 104
- 6-3-3. Parts List 104
- CPU Board 104
- 7. Waveform with Oscilloscope 105
- Driving Signal Driving Signal 106
- Distributed by 108
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