Brother 7820 N Manual

Troubleshooting and routine maintenance11 - 26
11
2Hold down the lock lever on the left and 
pull the toner cartridge out of the drum 
unit.
3Unpack the new toner cartridge. Place 
the used toner cartridge into the 
aluminium bag and discard it according 
to local regulations. 
CAUTION
■Place the drum unit on a drop cloth or 
large piece of disposable paper to 
avoid spilling and scattering the toner.
■Handle the toner cartridge carefully. If 
toner scatters on your hands or 
clothes, immediately wipe...

Chapter 11
11 - 27
4Gently rock the toner cartridge from side 
to side five or six times to distribute the 
toner evenly inside the cartridge.
5Remove the protective cover. 
6Insert the new toner cartridge in the 
drum unit until it clicks into place. If you 
put it in properly, the lock lever will lift 
automatically.
7Clean the primary corona wire inside the 
drum unit by gently sliding the blue tab 
from right to left several times. Return 
the blue tab to the Home position (
▼) 
before reinstalling...

Troubleshooting and routine maintenance11 - 28
11
Replacing the drum unit 
(DR-2000)
The machine uses a drum unit to create print 
images on paper. If the LCD shows 
Change Drum Soon, the drum unit is near 
the end of its life and it is time to buy a new 
one.
Even if the LCD shows 
Change Drum Soon, 
you may be able to continue printing without 
having to replace the drum unit for a while. 
However, if there is a noticeable deterioration 
in the output print quality (even before 
Change Drum Soon...

Chapter 11
11 - 29
2Hold down the lock lever on the left and 
pull the toner cartridge out of the drum 
unit. 
Note
Discard the used drum unit according to local 
regulations, keeping it separate from 
domestic waste. Be sure to seal the drum unit 
tightly so toner powder does not spill out of 
the unit. If you have questions, call your local 
waste disposal office.
3Unpack the new drum unit.
4Install the toner cartridge into the new 
drum unit until it clicks into place. If you 
put it in properly, the...

Troubleshooting and routine maintenance11 - 30
11
Machine Information
Checking the Serial Numbers
You can view the machine’s serial number on 
the LCD.
1MFC-7420: Press Menu/Set, 4 , 1.
MFC-7820N: Press  Menu/Set, 6 , 1.
2Press  Stop/Exit .
Checking the Page Counters
You can view the machine’s page counters 
for copies, printer pages, reports and lists, 
faxes or a summary total.
1MFC-7420: Press  Menu/Set, 4 , 2.
MFC-7820N: Press  Menu/Set, 6 , 2.
2Press ▲ or ▼ to select Total, Copy, 
Print or...

A - 1
A
Telephone services
BT Call Sign
This machine feature lets you use the BT Call 
Sign subscriber service which allows you to 
have at least two separate telephone 
numbers on one phone line. Each phone 
number has its own distinctive ringing 
pattern, so you know which phone number is 
ringing. This is one way you can have a 
separate phone number for your machine.
Your machine has a BT Call Sign compatible 
distinctive ringing function, allowing you to 
dedicate a second phone number (on the...

Appendix AA - 2
Advanced receiving 
operations
Operation from extension 
telephones
If you answer a fax call on an extension, or an 
external telephone that is correctly connected 
to the machine into the correct socket on the 
machine, you can make your machine take 
the call by using the Fax Receive Code. 
When you press the Fax Receive Code  51, 
the machine starts to receive the fax.
If you answer a call and no one is on the line, 
you should assume that you’re receiving a 
manual fax.
■Press  51...

A - 3
Changing the remote codes
If you want to use Remote Activation, you 
have to turn on the remote codes. The preset 
Fax Receive Code is 51. The preset 
Telephone Answer Code is  #51. If you want 
to, you can replace them with your own 
codes.
1If it is not illuminated in green, press 
 (Fax ).
2Press  Menu/Set , 2,  1, 4.
3Press ▲ or ▼ to select On (or Off).
Press  Menu/Set .
4Enter the new Fax Receive Code.
Press Menu/Set .
5Enter the new Telephone Answer Code.
Press Menu/Set .
6Press Stop/Exit ....

Appendix AA - 4
Connecting an external 
telephone answering device 
(TAD)
Sequence
You may choose to connect an external 
answering device. However, when you have 
an external  TAD on the same telephone line 
as the machine, the TAD answers all calls 
and the machine “listens” for fax calling 
(CNG) tones. If it hears them, the machine 
takes over the call and receives the fax. If it 
does not hear CNG tones, the machine lets 
the TAD continue playing your outgoing 
message so your caller can leave you...

A - 5
Recording outgoing message (OGM) 
on an external TAD
Timing is important in recording this 
message.
1Record 5 seconds of silence at the 
beginning of your message. (This allows 
your machine time to listen for the fax 
CNG tones of automatic transmissions 
before they stop.)
2Limit your speaking to 20 seconds.
Note
We recommend beginning your OGM with an 
initial 5-second silence because the machine 
cannot hear fax tones over a resonant or loud 
voice. You may try omitting this pause, but if...