Lexmark T520 - 20ppm 8MB Par USB Pcl6 Ps3 Ppds Service Manual page 83

4520-xxx
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
1 Main Fan
2 Main Fan to Engine Board
Cable
3 Error Code 927 (Fan runs)
4 Error Code 927
(Fan not running)
Action
Manually spin the fan and check that
it rotates freely. Check the cable
connection to the engine board, J1
for correct installation.
Check the continuity of the cable. If
incorrect, replace the cable.
Check the voltage at J1-1 on the
engine board. The voltage measures
+5 V dc (static) 0 V dc (fan running).
If incorrect, replace the main fan. If
this does not fix the problem, replace
the engine board.
Check the voltage at J1-3 on the
engine board. The voltages are:
+22 V dc to +24 V dc
(printer and fan running)
+12 V dc to +15 V dc
(printer not running - fan running
about half speed).
If incorrect, replace the engine
board. If this does not fix the
problem, replace the main fan.
Diagnostic Information
2-55