Service manual

3.2. PRINTER DISASSEMBLY AND ASSEMBLY
This section describes procedures for disassembling and assembling the main components of the printer.
When the procedure for installing a component is simply the reverse of removing the component, this chapter
does not describe the assembly procedure. If necessary, special notes on assembling or adjusting a component
are given at the end of the description of each procedure. Be sure to follow the instructions in these notes.
• Before disassembling any part of the printer, note the warnings in Section 3.1.
• Before beginning to disassemble the printer, remove the paper and the ink ribbon.
Also disconnect the interface cable.
• Whenever the printer is repaired, wipe the surface of the paper width (PW) sensor assembly
with a soft cloth, and keep it clean to avoid abnormal operation. If the surface is dirty from
any adhering material, sensor sensitivity goes down and operation is not correct.
• Be careful operating the release lever. Frequent operation of the release lever back and forth
without the upper housing cover may cause damage to the lever or dislocation of the engagement.
Note: Exploded diagrams in the appendix show you how the components fit together. Refer to them
as necessary. The flowchart below shows the order you need to use to disassemble the
printer. For details of the required adjustments, refer to Chapter 4.
START
Disconnect power
cord and I/F cable.
Before Starting
Disassembly
Removing the Panel
Board Assembly
Removing the
Printhead
Removing the
HP Sensor
Removing the
PW Sensor
Removing the
Platen Assembly
Removing the Upper
Housing Assembly
Removing the CR
Motor Assembly
Removing the
Printer Mechanism
Removing the
C186 MAIN Board
Removing the
C166 PSB/E Board
Removing the PF
Motor Assembly
Removing the
PG Sensor
Removing the Right
Frame Assembly
Disassembling the
Right Sub Frame
Removing the Left
Frame Assembly
Removing the RD
Assembly
Removing the CR
Assembly
Removing the Rear
PE Sensor
Removing the Front
PE Sensor
3.2.1
3.2.2
3.2.3 3.2.4
3.2.5 3.2.6
3.2.7
3.2.8
3.2.9
3.2.10
3.2.11
3.2.9.1
3.2.9.2
3.2.9.3 3.2.9.4 3.2.9.5
3.2.9.7 3.2.9.8
3.2.9.9
3.2.9.6
Page 3-5
Page 3-6 Page 3-7
Page 3-8 Page 3-8
Page 3-10
Page 3-11
Page 3-12
Page 3-13
Page 3-24 Page 3-25
Page 3-14
Page 3-15
Page 3-16
Page 3-16
Page 3-19
Page 3-20 Page 3-21 Page 3-23
Page 3-23
Bidirectional adjustment
required.
PG adjustment
required.
Bidirectional and PG
adjustment required.
Bidirectional adjustment
and factory setting required
(when part is replaced).
TPE level reset required
(when part is replaced).
Figure 3-2 Flowchart for Disassembling the Printer
Disassembly and Assembly LQ-2070 Service Manual
3-4 Rev.A