Brother FAX-2840 Service Manual

2-70
Confidential
 Vertical streaks
 How to clean the heat roller
1) Create a completely black pattern as shown below using Microsoft Word,
PowerPoint or other application, and print it on the paper set in the paper tray.
2) Set this paper in the paper tray with the printed surface (all black) facing down.
3) Print a completely white pattern on it.
4) Print any image on another sheet of paper and check that there is no dirt on the
paper.
5) If there is dirt on the paper, repeat steps 2) to 4).
6) When dirt still appears even after steps 2) to 4) are repeated several times, replace
the fuser unit.
 Black vertical streaks in a light background
<User Check>
- This problem may occur with noise which is caused by dirt on the
corona wire in the drum unit. In this case, clean the corona wire.
- If the same problem occurs after printing a few pages, the adhesive
of the label or the like, paper powder or dirt may be attached on the
surface of the exposure drum. Wipe off the dirt on the exposure
drum. (Refer to User's Guide, and perform the Drum Cleaning.)
- Replace the drum unit with a new one.
- Replace the toner cartridge with a new one.
- The corona wire cleaning lever is not at the home position.
Step Cause Remedy
1 Dirt in the paper feed system Wipe off the dirt.
2 Dirt on the heat roller
Clean the heat roller in the following procedures.
3 Scratch on the heat roller Replace the fuser unit.
CAUTION:
• If the machine prints the same pattern, especially including vertical streaks,
continuously, black vertical streaks may appear on the paper since the electrostatic
performance of the exposure drum is decreased temporally.
<User Check>
- Clean inside the machine and the corona wire of the drum unit.
- Replace the drum unit with a new one.
- Replace the toner cartridge with a new one.
100% black
All-black
100% white
All-white (no data)

Brother FAX-2840 Specifications

General

Group dial	8
Modem speed	33.6 Kbit/s
Color faxing	No
One-touch dials	22
Print technology	Laser
Fax compatibility	ITU-T G3
Fax coding methods	JBIG, MH, MMR (Fax coding method), MR
Fax resolution modes	Fine, Photo, Standard, Super Fine
Fax transmission speed	2.5 sec/page
Out-of-paper reception	400 pages
Error Correction Mode (ECM)	Yes
Fax speed dialing (max numbers)	200
Copier resize	25 - 400 %
Grayscale levels	256
Maximum copy resolution	300 x 600 DPI
Maximum number of copies	99 copies
N-in-1 copy function (N=)	2, 4
Copy speed (black, normal quality, A4)	20 cpm
Standard input capacity	250 sheets
Standard output capacity	100 sheets
Auto document feeder (ADF) input capacity	20 sheets
Supported media weight(s)	60 - 105 g/m²
Maximum standard media size	A4
ISO A-series sizes (A0...A9)	A4, A5, A6
Display number of lines	2 lines
Display number of characters	16
Processor family	ARM9
Processor frequency	200 MHz
Maximum internal memory	16 MB
Product color	Black, Grey
Sustainability certificates	ENERGY STAR
Noise level	53 dB
Noise level (idle)	30 dB
AC input voltage	220-240 V
AC input frequency	50 - 60 Hz
Power consumption (standby)	55 W
Power consumption (typical)	365 W
Power consumption (PowerSave)	1.5 W
Package weight	12900 g

Weight and Dimensions

Weight	9000 g
Dimensions (WxDxH)	368 x 360 x 311 mm