Brother MFC-L3780CDW 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-L3780CDW Specifications

General

Functions	Print, Copy, Scan, Fax
Fax Speed	33.6Kbps
Maximum Print Resolution	2400 x 600 dpi
Duplex Printing	Yes
Maximum Scan Resolution	1200 x 1200 dpi
Automatic Document Feeder (ADF)	50 sheets
Paper Input Capacity (Standard)	250 sheets
Connectivity	Ethernet, Wi-Fi, Wi-Fi Direct
Mobile Printing	Wi-Fi Direct
Max Paper Size	Legal

Summary

Safety Symbols and Conventions

Safety Alert Definitions

Hazard Icon Explanations

Safe Product Placement and Environment

Environmental Conditions

Specifies ideal temperature and humidity ranges for product installation.

Prohibited Placement Areas

Warns against placing the product near heat sources, water, or electrical appliances.

Environmental Hazards

Warns against exposure to sunlight, heat, flames, corrosive gases, moisture, and dust.

Chemical Exposure Risks

Details risks from placing the product near chemicals or flammable substances.

Ventilation Requirements

Emphasizes the need to keep ventilation slots clear to prevent overheating and fire.

Installation Clearance

Stable Surface and Location

Instructs to place the product on a stable surface, away from busy areas and hazards.

Cable and Cord Safety

Object Placement Restrictions

Important Usage and Connection Guidelines

Interference Avoidance

Safe Product Connection

Details electrical hazards, high-voltage electrodes, and plug handling safety.

Plug and Cord Integrity

Stresses ensuring the plug is fully inserted and the cord is not worn or frayed.

Product Servicing and Dismantling

Warns against dismantling or self-servicing the product due to shock and warranty risks.

Power Source Requirements

Specifies connection to AC power sources and warns against DC sources or inverters.

Safe Product Operation

Electrical Shock and Fire Risks

Highlights electrical shock and fire risks associated with improper operation.

Damage and Storm Precautions

Advises unplugging if damaged and avoiding use during thunderstorms for electrical safety.

Fire Hazard Warnings

Details fire risks from using flammable cleaning agents, paper jams, and toner spills.

Toner Handling and Vacuuming

Medical Equipment Interference

Pacemaker Interference

Object and Liquid Placement

Prohibits placing metal objects or liquids on the product to prevent fire or shock.

Hot Surface Caution

Alerts users that internal parts are hot after use and require cooling before touching.

Telephone Line and Power Cord Safety

Telephone Line Installation

Power Cord Safety Guidelines

Details safe usage, handling, and maintenance of the product's power cord.

Safe Product Handling and Moving

Two-Person Lifting Procedure

Instructs that at least two people should lift the product to prevent injury.

Lower Tray Handling

Finger Placement Caution

General Safety and Toner Handling

Silica Gel Pack and Toner Cartridge Safety

Toner Contact Precautions

Operational Safety and Warnings

Paper Edge and Radiation Safety

Label Integrity and Power Connection

Product Malfunction and Service

Unlawful Use of Equipment

Prohibited Copying/Scanning Items