Brother MFC-9440CN Service Manual

Confidential
1-71
Speaker is silent during on-hook dialing.
Step Possible cause Check Result Remedy
1
Connection
between main
PCB and speaker
Are the main PCB and
speaker connected
properly?
No
Reconnect the connector
properly.
2
Speaker Is the problem solved
after replacing the
speaker?
Yes
Replace the Speaker.
3
Connection
between main
PCB and NCU
PCB
Are the main PCB and
NCU PCB connected
properly?
No
Reconnect the connector
properly.
4
Harness between
main PCB and
NCU PCB
Is the harness damaged? Yes
Replace the harness with
a normal one.
5
Connection
between main
PCB and control
panel PCB
Are the main PCB and
control panel PCB
connected properly?
No
Reconnect the connector
properly.
6
Harness between
main PCB and
control panel PCB
Is the harness damaged? Yes
Replace the harness with
a normal one.
7
NCU PCB Is the problem solved
after replacing the NCU
PCB ASSY?
Yes
Replace the NCU PCB
ASSY.
8 Main PCB Is the problem solved
after replacing the main
PCB ASSY?
Yes
Replace the main PCB
ASSY.
Dialing function does not switch between "tone" and "pulse".
Step Possible cause Check Result Remedy
1
Connection
between main
PCB and NCU
PCB
Are the main PCB and
NCU PCB connected
properly?
No
Reconnect the connector
properly.
2
Harness between
main PCB and
NCU PCB
Is the harness damaged? Yes
Replace the harness with
a normal one.
3
NCU PCB Is the problem solved
after replacing the NCU
PCB ASSY?
Yes
Replace the NCU PCB
ASSY.
4
Main PCB Is the problem solved
after replacing the main
PCB ASSY?
Yes Replace the main PCB
ASSY.

Brother MFC-9440CN Specifications

General

Print technology	Laser
Maximum resolution	2400 x 600 DPI
Time to first page (color, normal)	16 s
Print speed (black, normal quality, A4/US Letter)	20 ppm
Scan to	e-mail, file, image, OCR
Input color depth	48 bit
Copier resize	25 - 400 %
PC free copying	Yes
Maximum copy resolution	1200 x 600 DPI
Maximum number of copies	99 copies
N-in-1 copy function (N=)	2, 4, 9, 16
Copy speed (black, normal quality, A4)	16 cpm
Faxing	Color faxing
Fax memory	400 pages
Modem speed	33.6 Kbit/s
Fax speed dialing (max numbers)	300
Total input capacity	250 sheets
Total output capacity	150 sheets
Multi-Purpose tray input capacity	50 sheets
Auto document feeder (ADF) input capacity	35 sheets
Internal memory	64 MB
Maximum internal memory	576 MB
Sound power level (standby)	30 dB
Sound pressure level (printing)	54.5 dB
Display	LCD
Market positioning	Business
Non-ISO print media sizes	Executive (184 x 267mm), Folio (media size), Legal (media size), Letter (media size)
ISO A-series sizes (A0...A9)	A4, A5, A6
ISO B-series sizes (B0...B9)	B5, B6
JIS B-series sizes (B0...B9)	B5
Maximum ISO A-series paper size	A4
Font styles	66 Scaleable fonts, 12 Bitmap fonts, 13 Barcodes
Dimensions (WxDxH)	432 x 487 x 482 mm
Networking features	10/100 Base-TX
All-in-one functions	Copy, Fax, Scan
Color all-in-one functions	copy, fax, print, scan
Compatible operating systems	Windows Vista/XP/Home/2003/2000 Mac OS X 10.2.4 or greater Linux
Standard interfaces	USB 2.0
Power consumption (standby)	95 W
Power consumption (PowerSave)	28 W
Power consumption (average operating)	495 W
Package weight	38600 g
Sustainability certificates	ENERGY STAR
Digital sender	No