Epson LC-7211 Specifiche Scaricare il pdf (Pagina 31)

– 27 –

Detecting

signal

+5V

Leaf switch

+5V

Detecting

signal

Friction

Skew

Tractor

Detecting

signal

Detecting

signal

(3) Paper end Detector

The paper end Detector is located in the paper chute unit. The A/D converter in the CPU detects the presence or

absence of paper.

(4) Release lever switch and lever switch Adjustment

Fig. 2-11 Release lever switch circuit and Adjustment lever switch circuit

Output

Detection

(

)

0 No paper

5 Paper present

Control Method

Output Release Adjustment

(

)

Lever SW Lever SW

0 Tractor Normal mode

5 Friction Multi-part mode

Control Method

Fig. 2-10Paper end detector circuit

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 107 108

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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