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FX Series
Epson FX Series Product Support
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REPAIRS/ADJUSTMENTS
4.4
FUSE
AND
FILTER
CIRCUIT
BOARD
Removal
Remove
the
Upper
Case
(4.1).
Disconnect
the
harness
from
the
Power
Transformer
(Refer
to
Parts
List
for
the
model
you
are
servicing).
Remove
the
screw
witnin
the
circle
marked
"CGND"
on
the
Fuse
and
Filter
Circuit
Board.
Remove
the
screw
fastening
the
ground
wire
from
the
AC
Power
Cord.
Remove
the
Fuse
and
Filter
Circuit
Board
with
the
AC
Power
Cord
attached.
Replacement
1.
Reassemble
in
reverse
order.
4.5
DAUGHTER
BOARD
(All
Models
except
RX)
Refer
to
Figure
4-4
Removal
o
3.
4.
5.
6.
Remove
the
Uppercase
Assembly
(4.1).
Disconnect
the
harness
from
the
Daughter
Board
to
the
Control
Circuit
Board
if
one
is
present
(fig.
4-4).
Remove
the
ground
strap
and
clamp.
Remove
the
screws
securing
the
Daughter
Board
to
the
Control
Circuit
Board.
Open
the
clamp
holding
the
Daughter
Board
to
the
Control
Circuit
Board.
Lift
the
Daughter
Board
from
the
Control
Circuit
Board.
Mounting
Screws
FX
Series
i
•
>Mounting
Screws
®
•
Harness
MX
Series
Figure
4-4
Daughter
Board
Removal
Replacement
1.
Reassemble
in
reverse
order.
4-2
EPSON
PRINTERS
4.6
CONTROL
CIRCUIT
BOARD
Refer
to
Figure
4-5
Removal
1.
Remove
the
Upper
Case
Assembly
(4.1)
2.
Remove
the
Daughter
Board
(4.5)
3.
Disconnect
connector
from
the
power
transformer.
4.
Disconnect
the
connector
from
the
Printer
Mechanism.
5.
Disconnect
any
other
connectors
from
the
Printer
Mechanism
(Refer
6.4-
Cable
Connections).
6.
Remove
the
screws
securing
the
Control
Circuit
Board
to
the
chassis
(fig.
4-5).
7.
Unhook
the
Control
Circuit
Board
from
the
Lower
Case
clamps.
8.
Lift
out
the
Control
Circuit
Board.
CN6
Mounting
Screws
m
Connectors
Lockmg
Tabs
FX
Series
Figure
4-5
Control
Board
Removal
Replacement
1.
Reassemble
in
reverse
order.
2.
Set
DIP
Switches
on
the
new
board
to
match
the
board
you
are
replacing.
100
102
Table of Contents
Table of Contents
3
Default Chapter
4
How to Use this Manual
4
Introduction
4
1 Principles of Operation
5
Principles of Operation
10
2 Wiring Data
19
Table of Contents
34
Default Chapter
36
Introduction
36
1 Service Call Procedures
37
Getting Started
37
Initial Checks
37
Power2-2
42
Alarm Sounds at Power on
45
Paper out Not Sensed
46
Abnormal Carriage Operation
47
Incorrect Paper out Tones
48
Paper Feed Motor
49
Incorrect Control Panel Status 2
49
Incorrect Printing
50
Dots or Characters Missing
51
Ribbon Not Advancing
52
On-Line/Off-Line Mode Malfunction
53
Incorrect Operation with Host Computer
53
3 Parts Lists
69
FX-80/80 + /85 Covers and Electrical Components
81
Printer Mechanism Components
83
Printer Mechanism Components (Part 2)
85
Repairs/Adjustments
100
Upper Case Assembly
100
Control Panel
100
Power Transformer
100
Fuse and Filter Circuit Board
101
Daughter Board
101
Control Circuit Board (Main Board)
101
Printer Mechanism
101
Print Head Unit
102
Print Head Adjustment
103
Home Position (HP) Sensor Assembly
103
HP Sensor Adjustment
103
Timing Belt Motor Assembly
104
Timing Belt Motor Adjustment
105
Timing Belt
105
Timing Belt Tension Adjustment
105
Ptssensor Board Assembly
106
Ptssensor Adjustment
106
Paper Feed Motor Assembly
107
Paper Feed Motor Adjustment
107
PE Board Assembly
108
Integrated Circuits
108
Carriage (Fxseries)
109
Carriage (MX Series)
110
5 Final Actions
112
Introduction
112
Lubrication
112
Printer Cleaning
121
6 General
122
Specifications
122
Special Tools and Supplies
123
Dipswitch Settings
123
IC Locations
135
Interface Boards
140
Dipswitch Settings for Interface Boards
140
Install Checklist
150
Revisions to the Manual
150
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User Manual
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Epson FX Series Specifications
General
Connectivity
Parallel
Paper Handling
Friction feed, Tractor feed
Emulation
Epson ESC/P
Noise Level
55 dB(A)
Print Method
Impact dot matrix
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