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I
OPERATIONS
AND
TIMING!
VII.
SELF DIAGNOSIS
The
DC
controller
PCB
has
a micropro-
cessor
that
diagnoses
the functions
of
the
copier
(particularly
the sensors)
at
appropri-
ate
intervals.
If
this
microprocessor
detects
an
abnormality,
it
will
display
the type
of
the
abnormality
on
the
indicator
on
the
control
panel.
The
table
below
shows
the various
fault
codes,
their
meaning,
and
the corresponding
detection
timing.
Example
of
E000 code
indication:
E
O
ODD
''9
nt
alternately.
Code
displayed
Main cause
Fault
criteria
:
,
ECCO
Thermistor
(TH1), Fixing
roller
heater
(H1),
AC
driver/DC
power
supply
PCB,
DC
controller
PCB,
operation
of
thermoswitch
•
If
the
temperature
ol
the
fixing rollers after
40 seconds
is
virtually
the
same
as
when
the copier
is
turned
ON.
(This
indication
does
not
appear
if
warm-up
is
completed
within
30 seconds.)
'
•
If
the
temperature
of
the
fixing roller
drops below
1
00°C
for
0.1
seconds
or longer
after
warm-up
is
completed.
EDu
i
Defective thermistor (TH1),
AC
driver/
DC
power
supply
PCB,
Fixing
roller
heater
(H1
),or
DC
controller
PCB
If
the
temperature remains
220°C
or
higher
for 0.1
seconds
or
longer.
E03D
Counter,
DC
controller
PCB
If
the
break
signal
is
emitted continuously
for 0.1
seconds
or
more
the counter
is
not
being
driven.
ESDS
Scanner
HOME
position
sensor
(Q3),
scanner motor
(M2),
motor
controller
PCB,
or
DC
controller
PCB
1
.
If
the
scanner
is
not
at
the
HOME
position
(SCHP
=
0)
when
the
COPY
START
key
is
pressed.
If
the
scanner does
not return
to
the
HOME
position
(SCHP
remains
0)
within
15
seconds
(A4
size) after
it
starts to
reverse.
2.
If
the
scanner
is
in
the
HOME
position
(SCHP
=
1)
when
the
COPY
START
key
is
pressed.
•
If
the
scanner does
not leave
the
HOME
position
(SCHP
remains
1
)
within
1
.5
second
after
it
starts to
advance.
•
If
the
scanner
does
not
return to
the
HOME
position
(SCHP
remains
0) within
1
second
after
it
leaves
the
HOME
position
(SCHP
=
0).
EEIU
Lens
home
position
sensor
(Q4),
or
DC
controller
PCB
•
If
the
lens
does
not return
to
the
HOME
position
(LHP
remains
0) within 2.5
seconds.
•
if
LHP
remains
1
for at
least
4
seconds
EESD
Lamp
regulater
Scanning lamp
At the
lamp
ON
timing,
LAON=1
is
not
true.
At the
lamp
OFF
timing,
LAON=0
is
not
true.
E2W5
DC
controller
PCB
If
the
data
in
EEPROM
has been
rewritten
more
than
specified.
ESEI
AC
driver/DC
power
supply,
DC
controller
PCB
If
the
mains
frequency
is
out
of
the
allowed
range.
EWOO
ADF
controller
PCB,
ADF
power
supply,
or
DC
controller
PCB
If
ADF
remains
for
12
seconds
or longer.
E5D0
Sorter
controller
PCB
or
DC
control-
ler
PCB
If
the copier
does
not
communicate
with
the
sorter
for
at least
12 seconds.
•
If
the
SORTER STANDBY
signal
does
not
return within
35
seconds
after
the
BCR
signal
is
outputted.
COPYRIGHT©
199!
CANON
INC.
CANON
NP-1550
REM
JAN.
1992
PRINTED
IN
JAPAN
(IMPRIME
AU
JAPON)
3-47
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