hi
just had a look on the service manual
The fan rotation has a fault.
• The fan has a fault.
• The DC controller PCB has a fault.
• The fan connector has poor contact.
Fixing heat discharge fan 1 (FM2)
Fixing heat discharge fan 2 (FM3)
Laser driver cooling fan (FM4)
Laser scanner motor cooling fan (FM5)
Laser scanner motor cooling fan 2 (FM6)
Cleaner heat exhaust fan (FM7)
System cooling fan (FM8)
Low-voltage power supply cooling fan 1
(FM10)
Low-voltage power supply cooling fan 2
(FM11)
Reader cooling fan 1 (FM12)
Reader cooling fan 2 (FM13)
Drum cartridge cooling fan 1
Drum cartridge cooling fan 2
Drum cartridge cooling fan 3
DC controller PCB cooling fan
Scanner motor cooling fan
hope it helps
Dave copier engineer