Brother FAX-2840 Service Manual

2-74
Confidential
 Black band
 Downward fogging of solid color
 Horizontal lines
<User Check>
- Clean inside the machine and the corona wire of the drum unit. If the
same problem occurs after cleaning, replace the drum unit with a
new one.
- The paper tray earth spring on the machine side may be dirty. Clean
it with a dry cloth.
Step Cause Remedy
1
Bend of tray earth spring (1) Correct bending of the tray earth spring.
(2) Replace the paper tray.
<User Check>
- Replace the toner cartridge with a new one.
Step Cause Remedy
1
High voltage power supply PCB
failure
Replace the high voltage power supply PCB
ASSY.
2 Main PCB failure Replace the main PCB ASSY.
<User Check>
- The paper tray earth spring on the machine side may be
dirty. Clean it with a dry cloth.
- Replace the drum unit with a new one.
- Replace the toner cartridge 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
Bend of tray earth spring (1)
Correct bending of the tray earth spring.
(2) Replace the paper tray.
3 Laser unit failure Replace the laser unit.
4
Scratch and dirt on the heat roller
(horizontal lines at intervals of 53.4
mm)
Replace the fuser unit.

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