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Brother MFC 8420 User Manual

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Page 41

1 - 15   INTRODUCTION
ECM (Error Correction Mode)
The Error Correction Mode (ECM) is a way for the MFC to check a 
fax transmission while it is in progress. If the MFC detects errors 
during fax transmission, if resends the pages of the fax that had an 
error. ECM transmissions are only possible between fax machines 
that both have this feature. If t hey do, you may send and receive fax 
messages that are continuously being checked by the MFC.
Your MFC must have enough memory for this feature to work....

Page 42

INTRODUCTION   1 - 16
Connecting an external telephone answering 
device (TAD)
Sequence
You may choose to connect an answering device. However, when 
you have an external TAD on the same telephone line as the MFC, 
the TAD answers all calls and the MFC “listens” for fax calling (CNG) 
tones. If it hears them, the MFC takes over the call and receives the 
fax.  If it doesn’t hear CNG tones, the MFC let s the TAD continue 
playing your outgoing message so your caller can leave you a voice 
message.
The TAD...

Page 43

1 - 17   INTRODUCTION
Do not connect a TAD elsewhere on the same phone l ine 
(unless you have the Distinctive Ring service).
TAD
TAD
 

Page 44

INTRODUCTION   1 - 18
Connections
The external TAD must be plugged into the back of the MFC,  int o t he 
jack labeled EXT. Your MFC cannot work properly if you plug the 
TAD into a wall jack (unless you are using Distinctive Ring).
1Plug the telephone line cord from the wall jack into the back of 
t he MFC, in the jack labeled LINE.
2Plug the telephone line cord from your external TAD into the 
back of the MFC, in the jack labeled EXT. (Make sure this cord 
is connected to the TAD at the TAD’s telephone...

Page 45

1 - 19   INTRODUCTION
Special line considerations
Roll-over phone lines
A roll-over phone system is a group of two or more separate 
telephone lines that pass incoming calls to each ot her if t hey are 
busy. The calls are usually passed down or “rolled over” to the next 
available phone line in a preset order.
Your MFC can work in a roll-over system as long as it is the last 
number in the sequence, so the call cannot roll away. Do not put the 
MFC on any of the other numbers; when the other lines are...

Page 46

INTRODUCTION   1 - 20
Converting telephone wall outlets
There are three ways to convert to an RJ11 jack. The first two ways 
may require assistance from the telephone company. You can 
change the wall outlets from one RJ14 jack to two RJ11 jacks. Or, 
you can have an RJ11 wall out let installed and slave or jump one of 
the phone numbers to it.
The third way is the easiest: Buy a triplex adapt er. You can plug a 
triplex adapter into an RJ14 outlet. It separates the wires into two 
separate RJ11 jacks...

Page 47

1 - 21   INTRODUCTION
Installing MFC, external two-line tad and two-line 
telephone
When you are installing an external two-line telephone answering 
device (TAD) and a two-line telephone,  your MFC must be isolated 
on one line at bot h the wall jack and at the TAD. The most common 
connection is to put the MFC on Line 2, which is explained in the 
following steps. The back of the two-line TAD must have two 
telephone jacks: one labeled L1 or L1/L2, and the other labeled L2. 
You will need at least...

Page 48

INTRODUCTION   1 - 22
Multi-line connections (PBX)
Most offices use a central telephone system. While it is often 
relatively simple to connect the MFC to a key system or a PBX 
(Private Branch Exchange), we suggest that you contact the 
company that installed your telephone system and ask them to 
connect the MFC for you. It is advisable to have a separate line for 
the MFC. You can then leave the Receive Mode set to FAX Only to 
receive faxes any time of the day or night.
If the MFC is to be connected...

Page 49

PAPER   2 - 1
2
About paper
Type and size of paper
The MFC loads paper from the installed paper tray, manual feed tray, 
multi-purpose tray or optional lower tray.
Recommended paper
Paper
Tray Type Model name
Paper tray (Tray #1) MFC-8420, MFC-8820D and 
MFC-8820DN
Manual feed tray  MFC-8420
Multi-purpose tray (MP tray) MFC-8820D and MFC-8820DN
Optional lower tray (Tray #2) Option for MFC-8420, MFC-8820D  and 
MFC-8820DN
Plain Paper: Xerox 4200DP 20 lb
Hammermill Laser Paper 24 lb
Transparency: 3M CG...

Page 50

2 - 2   PAPER
■Before you buy a large amount of paper, please test some t o 
make sure t hat the paper is suitable.
■Use paper that is made for plain-paper copying.
■Use paper that is 75 to 90 g/m
2 (20 to 24 lb).
■Use neutral paper.  Do not use acidic or alkaline paper.
■Use long-grain paper.
■Use paper with a moisture content of approximately 5%.
Caution
Do not use ink jet paper. I t may cause a paper jam and damage your 
MFC. 
Choosing acceptable paper
We recommend that  you test paper (especially...
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