T1- Under Temperature - Xerox DocuPrint C55 Service Manual

T1 UNDER TEMPERATURE RAP
NOTE: This RAP applies to both 115 and 220
volt printers. The 220 volt readings will be in
parenthesis.
After the proper warm up time has elapsed,
the fuser temperature is less than 85°C.
INITIAL ACTION
Remove the Fuser Module and check the
condition of the Fuser Connectors. Also check
to ensure that the ball which actuates the Low
Oil Sensor is moving freely. The ball could be
stuck in the down position which will prevent
the fuser from warming up. If the ball is not
free, you may be able to correct the problem
by removing the rubber stopper in the tank
above the ball and using a scribe or
screwdriver to loosen the ball.
NOTE: This is only a temporary fix. You
should have the customer order a new fuser
assembly. If in your judgment this is a
premature failure, follow the
warranty replacement procedures.
Switch the power off wait 10 seconds and
switch the power on. Recheck for the fault.
PROCEDURE
Switch the power off.
Locate connector CN1004/CN1008. This is a
two-wire (black and white wires, heavy gauge)
connector that provides AC power to the fuser.
The connector is located just to the left of the
PCU board (as you are looking at it).
Disconnect CN1004/CN1008.
Set up the meter to read Ohms. Connect the
meter between pins 1 & 2 of CN1008 the
Fuser side, (left connector) and measure the
resistance.
The resistance is less than 10 Ohms.
Y N
A B
STATUS INDICATOR RAPs
T1
A B
Go to BSD 10.5 in Section 7 and trouble-
shoot the Fuser connectors (CN1008,
1009) for an open circuit. If the wiring is
OK, replace the Fuser Module.
Be careful during the following test, High
Voltage AC may be present.
Set up the meter to measure 120 (220) VAC.
Connect between CN1004-2 and CN1004-1,
the LVPS side, (right connector).
Switch the Power on.
The reading is approximately 115 (220)
VAC.
Y N
Switch the
CN1004/CN1008.
Set up the meter to read +24 VDC.
applicable
Measure between CN107-20 (+) and
ground (− ).
Switch the printer on.
Open and
observing the meter.
The meter reads 24 VDC with the Printer
open and 0 VDC with the Printer closed.
Y N
Go to BSD 10.5 and troubleshoot the
AC on (L) signal and +24 VDC Inter-
locked (CN107-20, 16) for an open.
If the wiring is OK, replace the PCU
PWB.
replace
Supply.
C D
CAUTION
printer off. Reconnect
close the Printer while
If the problem still exists,
the Low Voltage Power
2/99
2-22
C D
Measure between CN107-18 (+) and
ground (− ).
The meter reads 0 VDC while the fuser
is trying to warm up.
Y N
Go to BSD 10.5 and troubleshoot the
Fuser on (L) signal (CN107-18) for an
open.
If the wiring is OK, replace the PCU
PWB. If the problem still exists,
replace the Low Voltage
Supply.
Measure between CN107-22 (+) and
ground (− ).
The meter reads 0 VDC while the fuser
is trying to warm up.
Y N
Go to BSD 10.5 and troubleshoot the
Heat Rod Sense (L) signal (CN107-
22) for a short to ground.
If the wiring is OK, replace the PCU
PWB. If the problem still exists,
replace the Low Voltage
Supply.
Replace the Low voltage power supply.
Go to BSD 10.5 in Section 7 and troubleshoot
the Fuser connectors (CN1004, 1008, 1009)
for an open circuit. If OK, replace the Fuser
Module.
DocuPrint C55/C55mp/[NC60]
Power
Power