F
-'Fuser
(251
5)
RAP
This RAP
is
used if there
is
a problem with
Fuser overtemperature or fuser warmup.
Also, a constant L8 or L9
is
displayed.
WARNING
The heat rod
and
tho fusor roll
may
bo
hot.
Be careful when working in this area.
Initial Actions
Ensure that the Thermistor Pad
is
free of contamination.
8
W/
TAG
5,
Check connectors
P/J
2,
6,
9,
17,
37,
38,
39, 40, 43, and 44 for
damage and proper seating.
Ensure that the Thermistor Pad
is
contacting the fuser roll.
DANGERO\)S
VOI.
TACIE,
E
Procedure
CAUTION
WIO
TAGS
2,
7,0r
89:
To prevent
damage to the drive gears; before
entering any diagnostic test which
requires the use of the main drive
motor (A); always enter the codes (g)
fuser and
(1)
cooling fans first, and then
allow the copier to operate for at least
2 minutes. Then press code (A) to start
the main drive motor.
The ovcrlreat
LED
will
be
lit
if
the
fuser temperature
is
more than 3904
(200oC). The overtemperature
thermostat will open when the
temperature
is
more than 5500
F
(290.C).
Enter the diagnostic codes
Ig
and
J
I,
W/
TAGS
2,7,
or
89
enter the code[Al
.
Wait
3
minutes.
The Fuser
Heat
Rod is on.
Y
N
Open the transport latching cover and
observe the overheat
LED
through tlis
hole in the frame.
The overheat
LED
is
off.
N
(An overheat condition exists
if
the
overheat
LED
is
lit.)
Switch off and unplug the copier.
Check the fuser triac for
a
short
circuit between MT1 and MT2. (This
could have caused the overheat relay
to open.) Replace the triac if there
is
a short circuit.
If there
is
no short circuit, go to FLAG
4 and check the wiring for a short
circuit to frame.
If
the problem
persists replace the Thermistor
Assembly
PWB
(A10).
Switch off and unplug the copier,
Measure the resistance between
P2-1
of
the
LVPS
and terminal
3
of the Line Filter.
There is less than
5
ohms between the
pins.
.
Check the Fuser Heat Rod for an
open circuit.
If
there
is
no open
circuit go to FLAG
4
and check the
wiring for an open circuit. If the
Fuser Heat Rod still does not turn on,
check the Over Temperature
Thermostat (A9) for an open circuit.
The Over Temperature Thermostat
(A9)
is
open.
Y
N
ABCD
ABCD
Go to FLAGS
1
and
3
and check
the wiring for an open circuit. If
no open circuit
is
found, replace
the Fuser Triac. If the problem
persists, replace
the
LVPS
PWB
(PSI),
If
tho problotn persisls,
replace the Controller
PWB
(A3).
Replace the Over Temperature
Thermostat A9
.
Disconnect
P/J
44
and check
R
fl
1
or a cold resistance
of between
lOOK
and
l5OK
ohms. If
not in Specification re lace the
Thermistor assembly
PWB
tb~
9.3).
11
resistance
is
OK
o to FLAG
2
and
?
check the wiring ,or an open circuit.
If no open circuit
IS
found, check the
follow~ng:
If the fans are not turning, go to
the
1.3
Cooling Fan RAP.
Remove the xerographic mo$ule
and check the air flow man~fold
in order to ensure that it
IS
not
distorted or cracked,
Remove the right side cover. Switch
on the copier and press start. Within
60
seconds after ready, the fuser
heat rod should begin to
cycle.
If
not, turn off immediately and
replace the Fuser Triac. If the
problem persists, replace the
LVPS
PWB (A2). If the problem persists,
replace the Controller
PWB
(A3).
Go to FLAGS
1
and
3
and check the
wiring for a short circuit. If no short
circuit
is
found, replace the Fuser Triac.
If
the problem persists, replace the
LVPS
PWB
(PSI).
If
the roblem persists,
F
replace the Corllroller
WU
(A3).
Disconriecl
P/J
44
and
check
R'fl
for
n
cold
resistance of between
lOOK
and
150K
ohms.
If not in Specification replace the Thermistor
assembly
PWB
(PL
9.3).
If resistance
is
OK
go
to
FLAG
2
and check the wiring for an open
circuit. If no open circuit
is
found, replace
the Contoller PWB,
6/93
F
-
Fuser
(251
5)
RAP
2.22 251 5
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