Read Sharp MX-FN14 Service Manual online
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Description
on
marks
The
following
marks
are
used
in
this
Service
Manual.
Mark
Meaning
Mark
Meaning
Indicates
that
connectors
are
disconnected.
Indicates
that
a
screw
is
removed.
Indicates
that
connectors
are
connected.
Indicates
that
a
screw
is
attached.
Indicates
that
wires
are
disengaged
from
a
cable
guide
or
wire
saddle.
Indicates
that
a
pawl
is
disengaged.
Indicates
that
wires
are
engaged
with
a
cable
guide
or
wire
saddle.
Indicates
that
a
pawl
is
engaged.
The
descriptions
on
this
Service
Manual
are
based
on
the
following
principles.
1.
E
ac
h
c
h
ap
te
r
d
e
sc
ri
b
e
s
th
e
p
u
rp
o
se
a
n
d
t
h
e
r
o
le
o
f
e
ac
h
f
u
n
c
ti
o
n
,
th
e
r
e
la
ti
o
n
sh
ip
between
the
electrical
system
and
the
mechanical
system,
and
the
operating
timing
of
each
part.
"
"
on
the
drawings
indicates
mechanical
drive
transmission.
If
is
used
together
with
a
signal
name,
it
indicates
a
flow
of
electricity.
"Power
supply"
in
each
chapter
indicates
that
the
power
switch
is
turned
ON,
that
the
front
door
is
closed,
that
the
paper
exit
door
is
closed,
and
that
the
power
is
supplied
to
the
machine.
2.
In
the
descriptions
of
the
digital
circuits
of
this
machine,
“1”
is
used
when
the
voltage
le
ve
l
o
f
a
si
gn
al
i
s
h
ig
h
,
an
d
“
0
”
i
s
u
se
d
w
h
e
n
i
t
is
l
o
w
.
T
h
e
v
o
lt
ag
e
v
al
u
e
,
h
o
w
e
ve
r,
depends
on
the
circuit.
Though
a
CPU
is
used
in
this
machine,
since
the
internal
operation
check
of
the
CPU
is
v
ir
tu
al
ly
i
m
p
o
ss
ib
le
,
th
e
o
p
e
ra
ti
n
g
d
e
sc
ri
p
ti
o
n
s
o
f
th
e
C
P
U
a
re
o
m
it
te
d
.
In
a
d
d
it
io
n
,
si
n
c
e
t
h
e
p
ri
n
te
d
b
o
ar
d
i
s
n
o
t
re
p
ai
re
d
o
n
t
h
e
c
u
st
o
m
e
r
si
d
e
i
n
p
ri
n
c
ip
le
,
th
e
c
ir
c
u
it
descriptions
of
the
printed
board
are
limited
to
rough
descriptions
using
block
diagrams.
Therefore,
the
circuit
descriptions
are
provided
in
the
following
three
kinds:
D
e
sc
ri
p
ti
o
n
s
fr
o
m
t
h
e
s
e
n
so
r
to
t
h
e
i
n
p
u
t
se
c
ti
o
n
o
f
th
e
c
ir
c
u
it
b
o
a
rd
w
h
ic
h
i
s
provided
with
the
control
function
and
the
drive
function.
Descriptions
from
the
output
section
of
the
circuit
board
which
is
provided
with
the
control
function
and
the
drive
function.
Descriptions
of
the
block
diagram
of
each
function.
including
the
sensors
and
the
input
section
of
the
circuit
board
which
is
provided
with
the
control
function
and
drive
function.
S
o
m
e
d
e
sc
ri
p
ti
o
n
s
m
ay
b
e
c
h
an
ge
d
a
c
c
o
rd
in
g
to
m
o
d
if
ic
at
io
n
s
o
n
t
h
e
p
ro
d
u
c
ts
,
an
d
t
h
e
in
fo
rm
at
io
n
o
n
a
n
y
c
h
an
ge
w
ill
b
e
i
n
fo
rm
e
d
b
y
S
e
rv
ic
e
I
n
fo
rm
at
io
n
(
T
e
c
h
n
ic
al
I
n
fo
rm
at
io
n
)
occasionally.
T
o
r
e
a
d
t
h
is
S
e
rv
ic
e
M
a
n
u
a
l
a
n
d
S
e
rv
ic
e
I
n
fo
rm
a
ti
o
n
(
T
e
c
h
n
ic
a
l
In
fo
rm
a
ti
o
n
)
is
s
u
e
d
o
c
c
a
si
o
n
a
lly
f
o
r
u
n
d
e
rs
ta
n
d
in
g
th
e
m
a
c
h
in
e
f
u
lly
a
n
d
c
o
rr
e
c
tl
y
i
s
a
n
a
d
v
is
a
b
le
w
a
y
f
o
r
obtaining
the
skills
and
knowledge
to
maintain
the
product
performa
nce
for
a
longer
time
and
to
perform
troubleshooting
efficiently.
•
•
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