Lexmark X925 - Power Supply Unit Fan Error; Main Unit Fan Error; Rear Fan Error

Diagnostic information 2-55
7541-03x
172.01 - Power supply unit fan error
173.01 - Main unit fan error
174.01 Rear fan error
Step Questions/actions Yes No
1 Is there anything obstructing the fan’s movement? Clear the
obstruction.
Go to step 2.
2
Check connector CN22 on the MDCONT board, and
CN04 and CN05 on the LVPS. Are they properly
connected?
Go to step 3 Reconnect the
connectors.
3
Replace the power supply fan. Does this remedy the
situation?
Problem solved. Go to step 4.
4
Replace the LVPS. See “Low volt power supply
removal” on page 4-51. Does this remedy the
situation.
Problem solved. Go to step 5.
5
Replace the engine power supply cable. Does this
remedy the situation
Problem solved Replace the
engine controller
board.
Step Questions/actions Yes No
1 Is there anything obstructing the fan’s movement? Clear the
obstruction.
Go to step 2.
2
Check connector CN22 on the engine controller board.
Is it properly connected?
Go to step 3 Reconnect the
connector.
3
Replace the main fan. Does this remedy the situation? Problem solved. Replace the
engine controller
board.
Step Questions/actions Yes No
1 Is there anything obstructing the fan’s movement? Clear the
obstruction.
Go to step 2.
2
Check connector CN26 on the engine controller board.
Is it properly connected?
Go to step 3 Reconnect the
connector.
3
Replace the rear fan. Does this remedy the situation? Problem solved. Replace the
engine controller
board.