Lexmark 4059-XXX - Manual (Page 74)

2-47 4059 Service Manual
4059-XXX
Fan Service Check
Auxiliary Fan Service Check
The auxiliary fan is in models 2420, 2450, 2455 and 3455.
Fan does not run or is noisy.
Main Fan Service Check
Check the cable connections at J1 on the engine board and at 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 Action
1 Fan Assembly Check the fan for proper installation
and for excessive noise. If incorrect,
replace the fan and cable assembly.
2 Engine Board Check to make sure the auxiliary fan
cable is seated on connector J7 on
the engine board. If correct, check
for +24 V dc on J7-1 on the engine
board. If incorrect, replace the
engine board. If correct, replace the
fan assembly.
Note: When the printer is in warm-
up the voltage at J7-1 measures
approximately +12 V dc. When the
printer is running, the voltage
measures approximately +24 V dc.
FRU Action
1 Main Fan Manually spin the fan and check that
it rotates freely. Check the cable
connection to the engine board, J1
for correct installation.
2 Main Fan to Engine Board
Cable Check the continuity of the cable. If
incorrect, replace the cable.