Epson LQ-300 Service Manual page 56

CHAPTER 3 Disassembly and Assembly
Table of Contents
3.1 OVERVIEW
3.1.1 Disassembly Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.1.2
Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - - .".-..."" """."""""""" 3-1
3.1.3 Service ChecksAfterRepair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3.1.4 Specifications forScreWs. . . . . . . . . . . . . . . .. ... ... ..."O"" ...."." 3-3
3.2 DISASSEMBLY AND ASSEMBLY
3.2.1 Removing the Printhead . . . . . . . . . . . . . . . . . ........""""-"". ""." 3-5
3.2.2 Removing the Upper Housing Assembly. . . . . . . . . . . . . . . . . . . . . . . . . 3-6
3.2.2.1 Removinq the Eject Roller Assembly ".""" .s s""""""" o -"" -" 3-6
Removingthe MAIN and PSB/PSE BoardAssembfies . . . . . . . . . . . . . . 3-7
3.2.3
3.2.3.1 Removing the MAIN Board Assembly. . . . . . . . . . . . . . . . . . . . . 3-8
3.2.3.2 Removing the PSB/PSE Board Assembly. . . . . . . . . . . . . . . . . . 3-8
Removing the Printer Mechanism . . . . . . . . . . . . . . . . . . . . . . " . . . " " " - 3-9
3.2.4
3.2.4.1 Removing the
Removing the CR Motor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
3.2.4.2
3.2.4.3 Removing the Platen. . . . . . . . . . . . . . . . . . . . . . . . ."". " -.. " 3-12
Removing the PE Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
3.2.4.4
Removing the HP Sensor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
3.2.4.5
Removing the Release Lever Position Sensor . . . . . . . . . . . . . 3-14
3.2.4.6
3.2.4.7 Removing the Carriage Assembly. . . . . . . . . . . . . . . . . . . . . . . 3-15
3.2.4.8 Removing the Ribbon Drive Gear Assembly. . . . . . . . . . . . . . . 3-16
Removing the PG Sensor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
3.2.4.9
Removing the Interface Board Assembly. . . . . . . . . . . . . . . . . . . . . . . . 3-18
3.2.5
Removing the Driven Roller Assembly . . . . . . . . . . . . . . . . . . . . . . . . . $19
3.2.6
Disassembling and Assembling the Color Upgrade Kit. . . . . . . . . . . . . 3-20
3.2.7
3.2.7.1 Removing the Ribbon Motor Assembly. . . . . . . . . . . . . . . . . . . 3-20
3.2.7.2 Removing the CS Cam. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . " 3-20
3.2.7.3 Removing the Color Sensor Assembly. . . . . . . . . . . . . . . . . . . 3-20
PF Motor . . . . . . . . . . . . . . . . . . . . . .. ------- 3-10
3-1
3-4