Brother MFC-9420CN Service Manual

Confidential
9-63
F-5
Speaker is silent during on-hook dialing.
Possible cause
Step
Check
Result
Remedy
Connection
between main
PCB and speaker
1 Main PCB and speaker
are properly connected.
No Fix the connection properly.
Speaker 2 Replacement of speaker
solves the problem.
Yes Replace the speaker with a
normal part.
Connection
between main
PCB and NCU
PCB
3 Main PCB and NCU
PCB are properly
connected.
No Fix the connection properly.
Harness between
main PCB and
NCU PCB
4 Harness is damaged. Yes Replace the harness with a
normal part.
Connection
between main
PCB and control
panel PCB
5 Main PCB and control
panel PCB are properly
connected.
No Fix the connection properly.
Harness between
main PCB and
control panel PCB
6 Harness is damaged. Yes Replace the harness with a
normal part.
NCU PCB 7 Replacement of NCU
PCB solves the problem.
Yes Replace the NCU PCB with a
normal part.
Main PCB 8 Replacement of main
PCB solves the problem.
Yes Replace the main PCB with a
normal part.
F-6
Dialing function does not switch between "tone" and "pulse".
Possible cause
Step
Check
Result
Remedy
Connection
between main
PCB and NCU
PCB
1 Main PCB and NCU
PCB are properly
connected.
No Fix the connection properly.
Harness between
main PCB and
NCU PCB
2 Harness is damaged. Yes Replace the harness with a
normal part.
NCU PCB 3 Replacement of NCU
PCB solves the
problem.
Yes Replace the NCU PCB with a
normal part.
Main PCB 4 Replacement of main
PCB solves the
problem.
Yes Replace the main PCB with a
normal part

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