Fixing exhaust fan (FM1):Discharge the hot air around the fixing unit and cool the laser scanner unit and electric elements on PCBs. The fan is controlled by the

CPU on the DC controller PCB.

Reader fan (FM2000): Cool the ADF pickup motor, the reader motor and the reader controller PCB. The fan is controlled by the CPU on the image processor PCB.

Its operating conditions are as follows:

a. Fixing exhaust fan (FM1)

1. During normal rotation, in the fixing cleaning mode (user mode), or after paper has reached the registration clutch

2. During transfer roller cleaning (user mode) or after operation of the main motor

1. After post-rotation, after completion of the cleaning mode, or 30 seconds after stop of the main motor

2. After stop of the main motor due to opening of a door or occurrence of a jam or other failures

The CPU on the DC controller CPU outputs a Fan Drive signal (FANON = 'H') to turn the fan.

The CPU judges that a fan failure has occurred if it detects a Fan Lock Detection signal (FANLOCK = 'H') during fan rotation.

b. Reader fan (FM2000)

1. When the ADF pickup motor or the read motor started the rotation.

When the image processor PCB outputs the fan drive siganal, the ASIC on the reader controller outputs the Fan Drive signal (FANON = 'H') to turn the fan.

There is not the lock detection during the fan rotation.

Image processor

PCB

ASIC

F-10-1

Power supply

CPU

Key SW

LED

LCD

Chapter 10

0016-7794