915-Control Cooling Fan Service Check - Lexmark C720 Service Manual

5024-001
915—Control Cooling Fan Service Check
FRU
1 Check Connector
2 Control Cooling Fan
Motor (CTFAN)
3 IOD1 P.W.B. Board
4 Main Engine (MCTL
P.W.B.) Board
Fan Motor (Control Cooling)
2-50
Service Manual
Action
Ensure the control cooling fan motor is
properly connected to DCN18 on the
IOD1 P.W.B. board.
Check that DCN1 or the IOD1 P.W.B.
board and 11CN on the main engine
(MCTL P.W.B.) board are connected.
Check the voltage between DCN18-1 and
DCN18-2 on the IOD1 P.W.B. board.
If the voltage drops to less than +24V,
replace the control cooling fan (CTFAN).
Check the voltage between DCN1-33 and
DCN1-44 on the IOD1 P.W.B. board.
If the voltage drops to less than +24V,
replace the IOD1 P.W.B. board.
If the problem still exists, replace the main
engine (MCTL P.W.B.) board.