Lexmark T420, Service Manual

Page: 73 / 208

Diagnostic Information
2-37
4048–00x
Hot Fuser Service Check
Make sure the correct voltage lamp is installed. The voltage rating is
stamped on one of the lamp contacts.
Main Motor Service Check
FRU Action
Fuser assembly Unplug the printer and measure the
resistance of the thermistor. The
resistance measures approximately
245K ohms when cool
(approximately 40°C) and
2K–3K ohms hot.
Replace the fuser assembly as
necessary.
FRU Action
Main Motor
Main Motor Cable 24 V dc on pin #7 at J10 on
the RIP card assembly.
• If the voltage is correct, check the
main motor cable for continuity.
• If the voltages are not correct, see
“Low Voltage Power Supply
(LVPS) Service Check” on
page 2-33
or replace the RIP card
assembly.
Note : Always check printhead
alignment after replacing the RIP
card assembly. See
“Printhead
Assembly Adjustment” on
page 4-2
for hardware alignment
of the printhead.
If continuity exists on each wire,
replace the main motor.
If continuity does not exist on one or
more of the wires, replace the motor
cable.