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REV.-A
2.1
2.2
2.3
CHAPTER 2
OPERATION PRINCIPLES
OPERATING PRINCIPLES OF PRINTER
2.1.1.
Mechanism
2.1.2. Carriage Mechanism
2.1.3.
Paper Feed Mechanism
2.1.3.1 Paper Feeding
2.1.3.2 Release Lever
2.1.3.3 Paper Insertion entrance
2.1.3.4 Top Edge Holder Mechanism Operation ...........2 -13
2.1.4 Ink Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.............2 -14
2.1.4.1
2.1.4.2
2.1.4.3
2.1.4.4
2.1.4.5
2.1.4.6
2.1.4.7
Pump Motor
5
Pump Mechanism
6
Cap Mechanism
7
Cleaning Mechanism and Carriage Lock
Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ink Cartridge and Ink End Sensor
Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wasted Ink Drain
Operational Sequence of Ink Mechanism ........2 -22
2.1.5 Case Open Interlock
OPERATING PRINCIPLES OF POWER SUPPLY
2.2.1 Voltage Allocation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..2-27
2.2.2 Operating Principles of Power Supply Circuitry ............2 -27
OPERATING PRINCIPLES OF CONTROL CIRCUITRY ...............2 -29
2.3.1
2.3.2
2.3.3
2.3.4
2.3.5
2.3.6
2.3.7
2.3.8
2.3.9
2.3.10
Control Circuitry Overview
Reset Circuit
Detection Circuit
1
Paper Feed Motor Drive Circuit ...........................................2-32
Carriage Motor Drive
Drive Circuit
Pump Motor Drive Circuit
TE Motor Drive Circuit
Timer Circuit and Backup Circuit ........................................2.37
EEPROM Control
Summary of Contents for SQ-1170
Page 1: ...EPSON TERMINAL PRINTER SQ 870 1170 4001225 REV A ...
Page 5: ... REVISION SHEET REVISON DATE ISSUED CHANGE DOCUMENT A Feb 21 1992 1st issue L e v ...
Page 143: ...REV A T hlta RR Ransir nf the Main Board Cont w w 5 16 ...
Page 149: ...c ...
Page 153: ...REV A Figure 6 2 Lubrication Points 1 6 3 ...
Page 154: ...REV A L Figure 6 3 Lubrication Points 2 6 4 ...
Page 162: ...53 co Re tifier Figure A 4 C076 PSB Board Circuit A 9 ...
Page 163: ...4 4 4 IJ 1 I 4 b 4 b 4 s v 5 s w 0 v Figure A 5 C076 PSB Board Circuit A 10 ...
Page 165: ...1 1 1 1 N a I I r c1 L k Figure A 7 C076 PSE Boerd Circuit Diagram A 1 2 J ...
Page 166: ... 11 I 1 I L I 1 Figure A 8 Control Panel Board Circuit Diagram A 1 3 ...
Page 176: ...EPSON Printed in Japan 92 02 7 G ...