Fuser Service Check - Lexmark X203N Service Manual

Fuser service check

When toner is partially fused to the paper, it is usually caused by low fuser temperature.
Note: Improper fusing can result from incorrect media setting's in the driver, or on the MFP. Check those
setting's before servicing the fuser.
Note: Make sure the correct voltage fuser is being used on the MFP.
Warning: Avoid handling the lamp as much as possible, as it is easily broken. Be careful not to touch the glass
housing with bare hands, because skin acids can weaken the glass. The lamp is not a service part.
The line voltage to the MFP must be within the following limits:
•
100 V ac–127 V ac for the 110 V model MFP
•
200 V ac–240 V ac for the 220 V model MFP
Turn the MFP off, and wait a few minutes for the fuser lamp to cool. Turn the MFP on, and observe the lamp
turning on during POST.
You can see the light from the lamp by opening the left side cover and observing the upper
opening through which the fuser power cables pass.
Fuser service check (continued)
FRU
Lamp cable
LVPS/HVPS
Fuser
Action
Unplug the MFP and disconnect the fuser lamp cable plug from the
LVPS/HVPS board connector CN102.
Check for continuity across the fuser lamp by checking across the
connector pins.
• If there is continuity, go to Step 1: Continuity.
• If there is no continuity, go to Step 2: No continuity.
Step 1: Continuity
Turn the MFP on with only the fuser power disconnected.
Measure the voltage at connector CN102 on the LVPS/HVPS. It
should match the line voltage.
If line voltage is not present, see
page 2-28 for more information.
Make sure the fuser thermistor is correctly connected to the controller
board. If the problem persists, disconnect the thermistor cable at J15
and check for less than +5 V dc on pin 1. Pin 2 should be ground.
If line voltage is incorrect on pin 1, see
check" on page 2-25 for more information.
Step 2: No continuity
Check the lamp cable for continuity.
• If correct, replace the fuser.
• If incorrect, replace the lamp cable.
Disconnect the thermistor cable from J10 on the controller card.
Measure the resistance across the ends of the thermistor cable. See
"Controller card" on page 5-4
Replace the fuser assembly if the resistance is lower than 1K ohm or
shorted.
Note: Resistance measures approximately 240K ohms when cool
and 1.4K ohms hot.
"LVPS/HVPS service check" on
"Controller card service
for more information.
Diagnostic information
7011-2xx
2-27