Brother MFC-B7720DN Service Manual

2-13
Confidential
 Location of sensors and clutches
Fig. 2-8
New toner sensor When exchange to the new toner cartridge, detects the
kinds of toner and add 1 to the reset of the developing bias
and to the exchange count.
Toner sensor Detects the toner cartridge is set.
External temperature/humidity
sensor
Detects external temperature and humidity around the
machine.
Pickup clutch Drives the pick up roller at the timing of paper feeding.
Registration clutch Controls the activation of the registration roller for the paper
alignment adjustment.
MP solenoid Presses the MP paper pick-up roller against the paper
when feeding from the MP tray.
Part name Operation
T1 clutch
New toner sensor PCB ASSY
Toner box relay PCB ASSY
*1
/
MP relay PCB ASSY
*2
Registration clutch
Registration rear sensor
Registration
front sensor
Paper feed sensor PCB ASSY
Toner box solenoid
*1
Eject sensor
PCB ASSY
Back cover/duplex
tray sensor
Front cover sensor
Toner box new PCB ASSY
*1
Toner sensor
PCB ASSY
*1
ADF cover sensor
Document scanning position sensor
Document detection sensor
Hook switch
*1
: For models with Toner box
*2
: For models without Toner box

Brother MFC-B7720DN Specifications

General

Brand	Brother
Model	MFC-B7720DN
Category	All in One Printer
Language	English