Brother MFC-9420CN Service Manual

Confidential
9-59
L-2
The control panel does not work.
User Check
(1) No
Possible cause Step Check Result Remedy
Key sticking 1 Any key on control
panel is stuck.
Yes Clean up the panel cover, or
remove the burrs from panel
cover and panel keys.
Connection
between main
PCB and control
panel PCB
2 Main PCB and
control panel PCB
are properly
connected.
No Fix the connection properly.
Harness between
main PCB and
control panel
PCB
3 Harness is damaged. Yes Replace the harness with a normal
part.
Rubber key 4 Replacement of
rubber key solves the
problem
Yes Replace the rubber key with a
normal part.
Control panel
PCB
5 Replacement of
control panel PCB
solves the problem.
Yes Replace the control panel PCB
with a normal part.
Main PCB 6 Replacement of main
PCB solves the
problem.
Yes Replace the main PCB with a
normal part.
L-3
Printing from Macintosh applications fails.
User Check
(1) Verify that the printer driver supplied with the machine has been installed in the system
folder and selected in the selector.
(2) Check the port selected in the selector. The selected port has to match the actual port to
which the printer cable is connected.
Possible cause Step Check Result Remedy
Fault in machine 1 Test page can be
printed using the
method described in
8.1.4.5 ‘Test Pattern
1’ in Chapter 8.
No Check the symptom of the
problem and refer to an
appropriate section in this
Chapter to solve the problem.
Breakage of main
PCB
2 Printing can be made
using an appropriate
PC, printer cable,
and RS-100M?
No Replace the main PCB.

Brother MFC-9420CN Specifications

General

Print technology	Laser
Maximum resolution	1200 x 2400 DPI
Economical printing	Yes
Print speed (black, normal quality, A4/US Letter)	31 ppm
Print speed (color, normal quality, A4/US Letter)	8 ppm
Digital sender	No
Number of print cartridges	4
Scanner type	Flatbed scanner
Scanner features	Scan to: e-mail, image, OCR, file
Copier resize	25 - 400 %
Maximum copy resolution	600 x 600 DPI
Maximum number of copies	99 copies
Copy speed (black, normal quality, A4)	31 cpm
Copy speed (color, normal quality, A4)	8 cpm
Faxing	Color faxing
Fax memory	500 pages
Modem speed	33.6 Kbit/s
Fax speed dialing (max numbers)	200
Total input capacity	750 sheets
Maximum input capacity	250 sheets
Auto document feeder (ADF) input capacity	35 sheets
Maximum internal memory	576 MB
Bundled software	ScanSoft PaperPort Presto! PageManager
I/O ports	IEEE-1284 USB 2.0
Dimensions (WxDxH)	483.5 x 514 x 530 mm
Printer management	BRAdmin Professional, MIB-II
Networking features	10Base-T/100Base-TX
All-in-one functions	Fax, Scan
Color all-in-one functions	copy, fax, print, scan
Compatible operating systems	Windows 98(SE)/ Me/ NT WorkStation 4.0/ 2000 Professional/ XP Mac OS 9.1 - 9.2, Mac OS X 10.2.4+
Sustainability certificates	ENERGY STAR
Power consumption (standby)	85 W
Power consumption (PowerSave)	16 W
Power consumption (average operating)	1090 W
Operating temperature (T-T)	10 - 32 °C
Operating relative humidity (H-H)	20 - 80 %
Market positioning	Business