Epson 2070 Service Manual - Page 47
Operating Principles
UPC - 010343812277
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CHAPTER 2 Operating Principles Table of Contents 2.1 PRINTER MECHANISM OPERATION 2-1 2.1.1 Printing Mechanism 2-1 2.1.2 Carriage Movement Mechanism 2-2 2.1.3. Platen Gap Adjustment 2-3 2.1.4 Paper Handling Mechanism 2-4 2.1.4.1 Release Lever 2-4 2.1.4.2 Paper Advance Mechanism 2-5 2.1.5 Paper Paths 2-11 2.1.6 Ribbon Advance Mechanism 2-16 2.2 POWER SUPPLY OPERATION 2-17 2.2.1 Power Supply Overview 2-17 2.2.2 Power Supply Circuit Operation 2-18 2.3 CONTROL CIRCUIT 2-22 2.3.1 Control Circuit Operation Overview 2-22 2.3.2 System Reset Circuit 2-24 2.3.3 Printhead Driver Circuit 2-24 2.3.4 CR Motor Driver Circuit 2-25 2.3.5 PF Motor Driver Circuit 2-26 2.3.6 EEPROM Control Circuit 2-26 2.3.7 Sensor Circuits 2-27
CHAPTER 2
Operating Principles
Table of Contents
2.1
PRINTER MECHANISM OPERATION
2-1
2.1.1
Printing Mechanism
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.1.2
Carriage Movement Mechanism
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2.1.3. Platen Gap Adjustment
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.1.4
Paper Handling Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
2.1.4.1 Release Lever. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
2.1.4.2 Paper Advance Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
2.1.5
Paper Paths
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
2.1.6
Ribbon Advance Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
2.2
POWER SUPPLY OPERATION
2-17
2.2.1
Power Supply Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17
2.2.2
Power Supply Circuit Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18
2.3
CONTROL CIRCUIT
2-22
2.3.1
Control Circuit Operation Overview
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22
2.3.2
System Reset Circuit
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-24
2.3.3
Printhead Driver Circuit
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-24
2.3.4
CR Motor Driver Circuit
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-25
2.3.5
PF Motor Driver Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26
2.3.6
EEPROM Control Circuit
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26
2.3.7
Sensor Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-27