Fan Service Check - Lexmark T620 Service Manual

4069-5XX/7XX

Fan Service Check

Printhead Fan Service Check
The printhead fan is in models 722/72n.
Note: If the printhead fan is inoperative and a lot of graphics are
printed, you may see darker than normal copies.
Fan does not run or is noisy.
FRU
1 Fan Assembly
2 System Board
Main Fan Service Check
Check the cable connections at J5 on the
main fan assembly. The main fan runs continuously when the printer
is powered on unless the printer is in the Power Saver mode.
FRU
1 Main Fan
Action
Check the fan for proper installation
and for excessive noise. If incorrect,
replace the fan and cable assembly.
Check to make sure the printhead
fan cable is seated on connector J4
on the system board. If correct,
check for +24 V dc on J4-1 on the
system board. If incorrect, replace
the system board. If correct, replace
the fan assembly.
Note: When the printer is in warm-
up the voltage at J4-1 measures
approximately +12 V dc. When the
printer is running, the voltage
measures approximately +24 V dc.
system
Action
Manually spin the fan and check that
it rotates freely. Check the cable
connection to the system board, J5
for correct installation.
Diagnostic Information
board and at the
2-63