U4-1 Fuser On Time Fail; U4-2 Over Heat Temp Fail - Xerox WorkCentre 5020 Service Documentation

U4-1 Fuser On Time Fail

BSD-Reference: CH10.1 (Figure 1)
Explanation
• The lamp did not turn OFF within the specified time after turning ON.
• Or, Warm Up was not completed within the specified time after power ON.
Procedure
When U4-1 occurs, [NVM 50-20 FSR Reset FuserOverTemp] becomes "3." Run [NVM 50-20
FSR Reset FuserOverTemp] using "0" to reset it. (How to Enter the Diagnostic Mode) Check
to see if there is paper in the Fuser. The Fuser is normal and there is no paper in it.
Y N
Remove the paper.
Check the condition of the Fuser. The Fuser is installed properly.
Y N
Install the Fuser properly.
Remove the Fuser. Check the conductivity between the Thermostat contacts. The
are conductive.
Y N
Replace the Fuser (PL 5.1) (REP 5.1.1).
Check the Heater Rod for an open circuit. There is no open circuit between J600-1 ( P/
J600) and J600-2.
Y N
Replace the Fuser (PL 5.1) (REP 5.1.1).
Check the resistance of the Thermistor. There is no open circuit between J601-1 ( P/J601)
and J601-2, and the resistance is a minimum of 228k ohms (cold).
Y N
Replace the Fuser (PL 5.1) (REP 5.1.1).
Immediately after Main Switch ON, the voltage between J3-3 ( P/J3) (ACH) and J3-1
(ACN) is approximately 200VAC.
Y N
Replace the LVPS (PL 8.1) (REP 8.1.2).
Check the wire between J408 ( P/J408) and P601 ( P/J601).
P601 is not shorted or open.
Y N
Repair the wire.
Check the wire between J3 ( P/J3) and P600 ( P/J600). The wire between J3 and P600 is
not shorted or open.
Y N
Repair the wire.
Replace the Fuser (PL 5.1) (REP 5.1.1), the LVPS (PL 8.1) (REP 8.1.2), and the AIOC PWB
(PL 8.1) (REP 8.1.1) in that order.
Initial Issue
WorkCentre 5020

U4-2 Over Heat Temp Fail

BSD-Reference:
Explanation
A temperature of 250°C or higher was detected continuously for 480 ms.
Procedure
When U4-2 occurs, [NVM 50-20 FSR Reset FuserOverTemp] becomes "1." Run [NVM 50-20
FSR Reset FuserOverTemp] using "0" to reset it. (How to Enter the Diagnostic Mode) Check
the resistance of the Thermistor. There is no open circuit between J601-1
J601-2, and the resistance is a minimum of 228k ohms (cold).
Y
Check the wire between J408 ( P/J408) and P601 ( P/J601). The wire between J408 and
P601 is not shorted or open.
Y
contacts
Replace the Fuser (PL 5.1) (REP 5.1.1), the LVPS (PL 8.1) (REP 8.1.2), and the AIOC PWB
(PL 8.1) (REP 8.1.1) in that order.
The wire between J408 and
July, 2007
2-27
CH10.1 (Figure 1)
N
Replace the Fuser (PL 5.1) (REP 5.1.1).
N
Repair the wire.
( P/J601) and
Status Indicator RAPS
U4-1, U4-2