927.Xx Fan Service Check; Main Fan; Cartridge Fan Service Check - Lexmark T640 Service Manual

4061-xx0

927.xx Fan service check

927.xx can be used for the main fan or the cartridge fan.
•
Main fan—927.00, 927.01, and 927.03 through 927.07.
•
Cartridge fan—927.02

Main fan

Service tip: The main fan runs at full speed at the end of POR or when the printer is printing. It will only run half
speed when the printer is in the Ready state and not printing.
FRU
1 Main fan
2
Main fan
3 Main fan blades turn during
POR, then stop. Fan will not
run when trying to print.
Main fan
System board
4 Main fan blades do not turn

Cartridge fan service check

Error code 927.02 indicates a problem with the cartridge fan.
FRU
1 Cartridge fan
2 Cartridge fan
3 Cartridge fan
System board
2-76
Service Manual
Action
Check the main fan to make sure it is plugged into J4 on the system
board. If the fan cable id correctly connected to J4, check the cable
and the cable connector for any signs of damage. If damaged,
replace the main fan assembly. See
page 4-57. If undamaged, go to step 2.
Turn the printer off and check the main fan for any signs of blockage
of the fan blades. If there is any sign of blockage, remove the
blockage.
Measure the voltage at J4-1 on the system board. The voltage should
measure approximately +2.5 V dc. If incorrect, replace the main fan.
See "Main fan removal" on page
If that does not fix the problem, replace the system board. See
"System board and inner shield removal" on page
Measure the voltage at J4-3. The voltage should measure +14.4 V dc
with the fan running full and approximately 7.0 V dc when running
half speed. If incorrect, replace the main fan. See
removal" on page 4-57. If this does not fix the problem, replace the
system board. See "System board and inner shield removal" on
page 4-77.
Action
Check to make sure the cartridge is plugged into J5 on the system
board. If properly plugged in, go to step 2.
Check for any signs of blockage in the fan. If any is found, remove
and retry the printer. If no problem is found, go to step 3.
Replace the following FRUs in the order shown:
• Cartridge fan.
• System board. See "System board and inner shield removal"
on page 4-77.
"Main fan removal" on
4-57.
4-77.
"Main fan