Epson U375 - TM B/W Dot-matrix Printer, Technical Manual

Page: 129 / 179

5-43
5.4 WHOLE UNIT ASSEMBLY
As for the printer mechanism unit, the assembly process for
the whole unit is divided into sub-assembly and main
assembly.
Perform the sub-assembly first to construct each unit from
the component parts. Then proceed to the main assembly.
When assembling the printer, check each part and its
attachment position by referring to Section 6.3,
Overall
Exploded Diagrams.
A star (
★
) in the Assembly Step column indicates that
checking (<Checkpoint>) or adjustment (<Adjustment>) is
required. For adjustments, follow the descriptions in Sec-
tion 5.4.4,
Adjustments. Whenever disassembly is per-
formed even for just one part, check whether adjustment is
necessary before reassembly.
An assembly step and part name enclosed in a parenthesis
indicate a part previously assembled or previously used
part that is being carried over into another assembly.
5.4.1 Component Parts
Component parts in each assembly are shown in the
following. Small parts such as screw are omitted.
N.E. detector unit
Sub-assembly A Holder-N.E. detector
Nut
Microswitch
Lever-N.E. detector
N. E. detector cable assembly
Caution seals
Sub-assembly B Cover
Caution seal A
Caution seal B
Main circuit board unit
Sub-assembly C Main circuit board assembly
P-ROM
Paper take-up gear assembly
Sub-assembly D Paper take-up gear
Paper take-up torque spring
Paper take-up drive pulley
Rubber feet and Frame ground screw
Sub-assembly E Plate-Base assembly
Rubber foot
Switch circuit board assembly and Sensor circuit board assembly
Sub-assembly F Plate-Front
Switch circuit board assembly
Sensor circuit board assembly
Main Assembly 1 Main circuit board unit
Sub-assembly C
Motor cable assembly
Head cable assembly
Carriage motor cable assembly
Power switch assembly
Plate-Base assembly
Sub-assembly E
Hexagon lock screw
Cover-Circuit board
Main Assembly 2 (Case-Main)
N.E. detector unit
Sub-assembly A
Main Assembly 3 (N.E. detector unit)
Plate-Base assembly
Plate-Auxiliary
Main Assembly 4 Paper roll receive roller
J paper guide roller
Power switch assembly
Spacer-N.E. detector
Detection adjustment screw
Paper take-up belt
Paper take-up gear assembly
Sub-assembly D
Shaft-Paper take-up gear
Main Assembly 5 Printer mechanism assembly
Plate-Front
Sub-assembly F
Main Assembly 6 Sleeve
Vibration spacer
Printer mechanism assembly
(Cables)
Main Assembly 7 (Paper take-up belt)
(Cables)
Main Assembly 8 (Cables)
Eye lock
GND plate
Main Assembly 9 Switch panel
Cover-Face
Main Assembly 10 Document table
Cover
Sub-assembly B
Paper take-up shaft assembly
Main Assembly 11 Cover-ROM
Spacer-ROM
CONFIDENTIAL