Xerox 5915, Руководство по обслуживанию

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2-21 2.4 Level 2 Troubleshooting
Section 2 Troubleshooting
U4-1 FUSER THERMISTOR OPEN FAIL
Ref. BSD: 7
Preparation : Ensure that the following connectors are securely
connected.
•
P/J410 of Main PWB
•
P/J118 of Fuser Thermistor
Procedure
WARNING:
Power off the machine and disconnect the
power cord.
WARNING: Fuser surfaces are hot, allow the fuser to cool down
before attempting service procedure. Fuser lubricant can cause
discomfort to eyes. Do not allow fuser lubricant to touch eyes
Disconnect P/J118.
Measure the resistance from J118-1 to J118-2.
•
Fuser is hot: approx. 13k
Ω
•
Fuser is cool: approx. 236k
Ω
Does the resistance value satisfy the above spec. ?
Y N (
∞
)
Check the wire from P/J118-1 to P/J410-3, and the wire from
P/J118-2 to P/J410-4. If no problem exists, replace the Fuser
Thermistor.
Replace the Main PWB.
U4-2 FUSER WARM UP FAIL
Ref. BSD: 7
Preparation : Ensure that the following connectors are securely
connected.
•
P/J410 of Main PWB
•
P/J430/T111/T110 of AC Drive PWB
•
P/J 12/13 of Main Heater Rod
•
Relay Connector P/J14
NOTE : This is sometimes displayed when C/E visits the customer
and switches the m/c on after the power has been off after the
occurrences of U4-3, U4-4 & U4-6.
Therefore, the diagnosis of Thermostat is first performed.
Procedure
WARNING:
Power off the machine and disconnect the
power cord.
WARNING: Fuser surfaces are hot, allow the fuser to cool
down before attempting service procedure. Fuser lubricant
can cause discomfort to eyes. Do not allow fuser lubricant to
touch eyes
Remove the Fuser Cover.
Is there continuity between the Fuser Thermostat leads?
Y N (
∞
)
Press the Manual Reset button of the Fuser Thermostat.
Is there continuity between the Fuser Thermostat leads?
Y N
Replace the Fuser Thermostat. Proceed with the
diagnosis using U4-3/U4-4/U4-6 Over Heat FIPs.
Proceed with the diagnosis using U4-3/U4-4/U4-6 Over Heat
FIPs.
Disconnect J12/J13 of Heater Rod?
Is there continuity between J12 and J13?
Y N
Replace the Heater Rod.
Remove the Fuser Cover.
Cheat the Front Interlock Switch.
Power on.
Does the Main Heater Rod turn on?
Y N
Is the voltage form T110 to T111 of AC Drive PWB 220VAC?
Y N
A B C
A B C
Is the voltage from P410-11 of Main PWB to COM
+ 24VDC?
Y N
Replace the AC Drive PWB.
Is the voltage from P410-12 of Main PWB to COM
+ 24VDC?
Y N
Replace the AC Drive PWB.
Check 220VAC circuit.
Is the voltage between Relay Connectors P/J14-1 and -2
220VAC?
Y N
Check the wire from P/J14-1 to T111 of AC DRIVER.
Check the wire from P/J14-2 to T110 of AC DRIVER.
Check the wire from P/J14-1 to P/J12.
Check the wire from P/J14-2 to P/J13.
Power off.
Check for the scraped Heat Roll surface, the raised-off Fuser
Thermistor, the deteriorated Heater Rod. If no problem exists, replace
the Fuser Thermistor.