Table Of Contents - Epson LQ-300 + Service Manual

Chapter 1 Product Description
1.1 Features .............................................................................................. 4
1.2 SPECIFICATIONS .............................................................................. 5
1.2.1 Physical Specification .................................................................. 5
1.2.2 Printing Specification ................................................................... 6
1.2.3 Paper Feeding ............................................................................. 9
1.2.4 Electrical Specification .............................................................. 10
1.2.5 Environmental Condition ........................................................... 10
1.2.6 Reliability ................................................................................... 10
1.2.7 Ribbon Cartridge ....................................................................... 10
1.2.8 Safety Approvals ....................................................................... 11
1.2.9 CE Marking ................................................................................ 11
1.2.10 Acoustic noise: ........................................................................ 11
1.3 INTERFACE ...................................................................................... 12
1.3.1 Parallel Interface (Forward Channel) ........................................ 12
1.3.2 Parallel Interface (Reverse Channel) ........................................ 14
1.3.3 Serial Interface .......................................................................... 15
1.3.4 Interface Selection ..................................................................... 16
1.3.5 Prevention Hosts from Data Transfer Time-out ......................... 16
1.3.6 IEEE1284.4 protocol ................................................................. 16
1.4 OPERATOR CONTROLS ................................................................. 17
1.4.1 Operation Switches ................................................................... 17
1.4.1.1 Switches ............................................................................. 17
1.4.1.2 LED .................................................................................... 18
1.4.1.3 Buzzer ................................................................................ 18
1.4.2 Panel Functions ......................................................................... 19
1.4.2.1 Usual Operation ................................................................. 19
1.4.2.2 Operation at Power-on ....................................................... 19
1.4.2.3 Default Setting .................................................................... 19
1.4.2.4 Bi-d. Adjustment ................................................................. 21
1.4.3 Errors ......................................................................................... 21
1.5 Control codes .................................................................................. 22
Contents
1.6 Initialization ...................................................................................... 22
1.7 PAPER .............................................................................................. 23
1.7.1 PAPER SPECIFICATIONS ....................................................... 23
1.7.2 Printable Area ........................................................................... 26
1.8 Accessories ..................................................................................... 28
1.9 Difference between LQ-300+ and LQ-305K ................................... 29
Chapter 2 Operating Principles
2.1 Overview .......................................................................................... 31
2.2 Printer Mechanism .......................................................................... 32
2.2.1 Printhead ................................................................................... 33
2.2.1.1 Buzzer Function ................................................................. 33
2.2.2 Carriage Mechanism ................................................................. 34
2.2.2.1 High speed skip method ..................................................... 36
2.2.3 Ribbon Mechanism ................................................................... 36
2.2.3.1 Ink Ribbon Shifting Mechanism .......................................... 36
2.2.3.2 Color Ribbon Driving Mechanism (Option) ......................... 36
2.2.4 Platen Gap Adjustment Mechanism .......................................... 38
2.2.5 Paper Feed Mechanism ............................................................ 39
2.2.5.1 Page Length Measurement ................................................ 40
2.2.6 Release Mechanism .................................................................. 41
2.2.7 Other Special Functions ............................................................ 41
2.2.7.1 Energy saving mode ........................................................... 41
2.2.7.2 Quiet Mode ......................................................................... 41
2.3 Electric Circuit Operating Principles ............................................. 42
2.3.1 C395MAIN Board ...................................................................... 42
2.3.2 C294PSB / C294PSE Board ..................................................... 43
2.3.2.1 Electric Circuit .................................................................... 43