Brother MFC-L3720CDW User Manual

Read this guide before attempting to operate the product, or before attempting any maintenance,
and ensure that you follow all warnings and instructions marked on the product. If you have
concerns about how to use your product safely after reading this guide, contact Brother customer
service or your local Brother dealer. Failure to follow these instructions may result in an increased
risk of personal injury or damage to property, including through fire, electrical shock, burns or
suffocation. Brother shall not be liable for the damage caused where the product owner has failed
to follow the instructions set out in this guide or on the product.
For more advanced instructions, information, and product specifications, see the Online User's
Guide at
support.brother.com/manuals.
Symbols and Conventions
Used in the Documentation
WARNING
WARNING indicates a potentially hazardous
situation which, if not avoided, could result in
death or serious injuries.
CAUTION
CAUTION indicates a potentially hazardous
situation which, if not avoided, may result in
minor or moderate injuries.
IMPORTANT
IMPORTANT indicates a potentially
hazardous situation which, if not avoided,
may result in damage to property or loss of
product functionality.
NOTE
NOTE specifies the operating environment,
conditions for installation, or special
conditions of use.
Hot Surface icons warn you not to
touch product parts that are hot.
Prohibition icons indicate actions
that must not be performed.
Electrical Hazard icons alert you to
the possibility of an electric shock.
Fire Hazard icons alert you to the
possibility of a fire.
Product Safety Guide
HL-L3220CW / HL-L3220CDW / HL-L3240CDW / HL-L3280CDW / HL-L8240CDW / DCP-L3520CDW / DCP-L3560CDW /
MFC-L3720CDW / MFC-L3755CDW / MFC-L3760CDW / MFC-L3780CDW / MFC-L8340CDW / MFC-L8390CDW
1

Brother MFC-L3720CDW Specifications

General

Functions	Print, Copy, Scan, Fax
Paper Capacity	250 sheets
ADF Capacity	50 sheets
Connectivity	USB, Ethernet, Wi-Fi
Memory	512 MB
Printer Type	Color Laser
Max Paper Size	A4
Print Speed	Up to 25 ppm
Print Resolution	2400 x 600 dpi
Duplex Printing	Yes
Mobile Printing	AirPrint, Google Cloud Print, Brother iPrint&Scan
Display	2.7-inch color touchscreen

Summary

Symbols and Conventions Used in the Documentation

Safety Level Indicators

Defines safety levels like WARNING, CAUTION, IMPORTANT, and NOTE for hazard communication.

Hazard Symbols Explained

Explains hazard symbols indicating hot surfaces, prohibitions, electrical dangers, and fire risks.

Choose a Safe Location for Your Product

Environmental Conditions for Placement

Prohibited Placement Locations

Warns against placing the product near heat sources, water, or in humid environments.

Product Placement and Environmental Hazards

Exposure Warnings

Chemical Exposure Risks

Ventilation Requirements

Safe Installation and Placement Guidelines

Surface and Stability Requirements

Location Restrictions

Prohibits placement near heaters, unstable surfaces, busy areas, or where objects block access.

Ventilation and Air Quality

Connecting the Product Safely

Electrical Hazard Precautions

Warns of electrical shock and fire risks from improper connection or internal components.

Internal Component Safety

Instructs to unplug the product before accessing internal parts to avoid shock from high-voltage electrodes.

Object Insertion Warning

Prohibits inserting objects into product openings to prevent contact with voltage points or short-outs.

Handling Electrical Connections

Advises against handling plugs with wet hands to prevent electrical shock.

Power Cord and Product Safety

Power Cord Integrity and Handling

Ensures plug insertion, warns against worn cords, and advises on safe handling and cleaning.

Product Servicing and Dismantling

Prohibits dismantling or self-servicing, warning of shock hazards and warranty voiding.

Power Source Requirements

Specifies connecting to AC power sources and avoiding DC sources or inverters.

General Product Safety

Fire Hazards and Usage Precautions

Damage and Weather Warnings

Cleaning and Fire Risks

Prohibits using flammable cleaners and warns about paper jams near the fuser unit causing fire.

Toner Handling Safety

Medical Equipment Interference

Health and Surface Safety

Pacemaker Considerations

Object and Liquid Placement

Hot Surface Warning

Alerts to extremely hot internal parts after use, recommending a 10-minute cool-down period.

Product Malfunction Indicators

Power Cord Safety

Plug and Socket Requirements

Ensures use of the earthed plug with a compatible socket and warns against defeating its purpose.

Cord Handling and Maintenance

Details safe practices for cord placement, avoiding damage, wear, strain, and frayed cords.

Cable Usage and Extension Cords

Recommends using only provided cords, avoiding undesignated cables, and not using extension cords.

Product Lifting and Carrying Safety

Two-Person Lifting Procedure

Finger Safety Precautions

Advises caution to avoid injuries by not putting fingers in specified areas during operation.

Product Storage and Toner Handling

Toner Cartridge Safety

Toner Contact First Aid

Operational Safety and Maintenance

Paper Edge and Radiation Warnings

Electrical Connection and Usage

Product Connection and Disconnection Safety

Power Cord Usage

Emergency Disconnection

Network Connection Safety

LAN Connection Caution