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'7
._
3. OPERAlIONS AND TIMING-
VII. SELF DIAGNOSjS
The
DC
controller
PCB
has
a
microprocessor
that diagnoses the functions
of the copier
(particularly
the sensors)
at
appropriate
intervals.
If this microprocessor
detects
an error, it will display
the type of
the error
on the indicator
on the control
panel.
The table below shows the various fault
codes,
their meaning,
and the correspon-
ding detection timing.
Example of EOOO code indication:
EaafliJlight
alternately.
Code displayed
Main cam3
Fault criteria
E
3ez
Thermistor (THl). Fixing roller
-
If the temperature of the fixing rollers after 40
heater (Hl), AC driver/DC power
seconds is virtually the same as when the copier is
supply PCB, DC controller PCB.
turned ON. (This indication does not appear if
Operation of thermoswitch
warm-up is completed within 30 seconds.)
-
If the temperature of the fixing roller drops below
100% for 0.1 seconds or longer after warm-up is
completed.
rrrrO
t
Defective thermistor (THl), AC
II the temperature remains 220°C or higher for 0.1
Iuu
f
driver/DC power supply PCB,
seconds or longer.
Fixing roller heater (Hl), or DC
controller PCB
r
ri
-1
B-4
CWZU
Counter, DC controller PCB
II the break signal is emitted continuously for 0.1
seconds or more the counter is not being driven.
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 staris 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).
E2 rU"
Lens home posirion sensor (Q4),
-
If the lens does not return to the HOME position
or DC controller PCB
(LHP remains 0) within 2.5 seconds.
*
If LHP remains 1 for at least 4 seconds.
-
7
7
17
tCCM
lamp regulator PCB
*
At the lamp ON liming, LAON=l is not true.
Scanning lamp
-
At the lamp OFF timing, LAON=O is not true.
EP
-
'_ro
DC controller PCB
The communication between microprocessor (master)
and microprocessor (slave) is interrupted.
E
zv#
DCcontrollerPCB
If the data in EEPROM has been rewritten more than
specified.
-
-tr'
1
tco
I
AC driver/DC power supply,
If the mains frequency is out of the allowed range.
DC controller PCB
E
'-eBu"
ADF controller PCB, AC driver/DC
If ADF remains 0 for
12
seconds or longer.
power supply PCB, or DC
controller PCB
E
s33
Sorter cuntroller PCB or DC
.
If the copier does not communicate with the sorier
controller PCB
for at least 12 seconds.
*
If
the SORTER STANDBY signal does not return
within 35 seconds after the BCR signal is
outputted.
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