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Epson FX Series Product Support
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GENERAL
6.6
IC
LOCATIONS
The
schematics
shown
on
the
next
few
pages
are
for
locating
replaceable
Integrated
Circuits
on
the
main
boards.
Replaceable
IC's
are
indicated
with
a
double
line
as
shown
in
figure
6-9.
Fig.
6-9.
Replaceable
IC
Symbol
On
the
FX-85.185,
80,
and
100,
there
are
some
IC's
that
fit
in
sockets
that
are
larger
than
tne
IC.
The
proper
orientation
of
the
IC
in
the
socket
is
shown
by
the
following
symbol
(fig.
6-10).
Fig.
6-10.
Offset
Orientation
of
IC
Symbol
When
replacing
IC's,
be
sure
to
order
the
proper
IC
for
the
printer
being
serviced.
6-14
6.6.1
FX-85/185/286
IC
Locations
FXEXT
Board
C2
5
CNI
'0
C3
U
C5
^^4168^20
O
14
4I6B-ZC
•32
:'®/
N-
*15"
(1»)CI
C4
it
EPSON
PRINTERS
25~
5A
20N
^
_
15
l4
i!
e
n
C7
CB
C9
u
20
—'a^—^8
—^8^
L
;o;
74LS00
74LSOO
74LS02
74LS00
10
74LS374
UNIT
Y49220800000
FXEXT
BOARD
oec-i9v-i
EPSON
laaa
aaaDaDKI
134
136
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
376 pages
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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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