Ricoh D009 Service Manual page 244

SC Tables: SC5xx -1
turning on the paper exit cooling fan motor.
Defective paper exit cooling fan motor or connector disconnection.
Defective IOB
Disconnected harness
Fusing motor error
The IOB does not receive the lock signal for 2 seconds after turning on the
fusing motor.
540 D
Motor overload
Defective fusing motor or connector disconnection.
Defective IOB
Disconnected harness
D009/D011/D012/D013 4-18 SM