Brother MFC-9420CN Service Manual page 62

(2) Motors (Refer to Fig. 3-30.)
No.
1 Main Motor PU
2 Developer Motor PU
3 Scanner Motor
(Laser ASSY)
4 Exit Fan PU
5 Power Supply Fan PU
6 Interlock Switch PU
6-1 Front Cover Switch
6-2 Paper Exit Cover Switch
6-3 Back Cover Switch
7 Laser Fan PU
6-2. Paper Exit
Cover Switch
6-3. Back Cover Switch
4. Exit Fan PU
5. Power Supply Fan PU
Name Code
MM
DM
SCM
EXFAN
PSFAN
DSW1
DSW2
DSW3
LDFAN
Fig. 3-30
3 - 2 8
Function
To drive the OPC belt and the paper
transport system.
To drive the toner cartridge and the
developing system.
To scan the laser beam.
To exhaust the heat of fusing unit.
To exhaust the heat of power supply unit
and Interface controller.
This the safety interlock switch when
opening the cover.
To exhaust the heat of laser ASSY.
6-1. Front Cover Switch
3. Scanner Motor
2. Developer Motor PU
1. Main Motor PU
7. Laser Fan PU
(Laser ASSY)
Confidential