Lexmark T620 Service Manual page 94

4069-5XX/7XX
FRU
1 Fuser Lamp (Incorrect
Lamp/925 Service Error)
2 Fuser Lamp
3 LVPS
LVPS to Fuser Auto
Docking Connector
Fuser AC Cable
4 Fuser Top Cover Assembly
(Thermal Fuse/Thermistor
Assembly)
2-66
Service Manual
Action
Install the correct voltage and
wattage lamp or fuser assembly.
Note: If the correct lamp is installed
and you still have 925 fuser errors,
try the following:
1. The fuser may have reached
standby temperature too quickly.
Check the fuser assembly, system
board or LVPS.
2. Ensure that the correct hot roll is
installed.
3. Check the AC line voltage to
ensure it is not above the
maximum rating for the printer.
Unplug the printer and check the
continuity between the two pins on
the fuser lamp cable going to the
fuser assembly. If you do not
measure continuity, remove the fuser
assembly and check the continuity of
the lamp. If incorrect, replace the
lamp. If correct, replace the fuser
cover assembly.
Turn the printer off. Remove the
fuser assembly. Turn the printer
power on. Measure across the AC
fuser cable pins for line voltage with
the cable connected. If incorrect,
turn the printer off and disconnect
the power cord. Check the continuity
of the LVPS to fuser AC cable. If
incorrect, replace the cable. If
correct, replace the LVPS.
Disconnect the thermistor cable. The
resistance is:
HOT - J2-1 - J2-2 = 2.5K ohms
COLD = 150K ohms to 260K ohms