Brother FAX-2840 Service Manual

2-73
Confidential
 White spots
 Black spots or dirt
<User Check>
- When the white spots appear at intervals of 32.5 mm, replace the
toner cartridge with a new one.
- 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.)
- When the white spots appear at intervals of 94.2 mm, replace the
drum unit with a new one.
Step Cause Remedy
1
Dirt on electrodes of the drum unit
and those of the machine
Clean the electrodes of the drum unit and
those of the machine. (Refer to Fig. 2-10
and Fig. 2-11.)
2
High voltage power supply PCB
failure
Replace the high voltage power supply PCB
ASSY.
3 Main PCB failure Replace the main PCB ASSY.
<User Check>
- When the black spots appear at intervals of 32.5 mm, replace the
toner cartridge with a new one.
- 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.)
- When the black spots appear at intervals of 94.2 mm, replace the
drum unit with a new one.
Step Cause Remedy
1
Dirt on electrodes of the drum unit
and those of the machine
Clean the electrodes of the drum unit and
those of the machine. (Refer to Fig. 2-10
and Fig. 2-11.)
2
Dirt on the heat roller Refer to “2-70 How to clean the heat roller”
to clean the heat roller.
3
Scratch on the heat roller
(black spots at intervals of 53.4 mm)
Replace the fuser unit.
4
High voltage power supply PCB
failure
Replace the high voltage power supply PCB
ASSY.
5 Main PCB failure Replace the main PCB ASSY.

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