Brother MFC-9420CN Service Manual

Confidential
5-66
5.1.57 Left Tray Guide PU / Paper Size Sensor PU / Room Temp Thermistor PU
(1) Remove the setscrew (BT3x8, 2 pieces) of the left tray guide PU.
(2) Pull out the left tray guide PU from the cassette side.
(3) Disconnect the connector connecting to the paper size sensor PU.
(4) Remove the connector tape.
(5) Remove the pin to remove the room temp thermistor PU.
(6) Disconnect the connector connecting to the room temp thermistor PU.
(7) Remove the setscrew (BT3x8, 2 pieces) of the paper size sensor PU and then remove the
paper size sensor PU from the left tray guide PU.
<Confirmation Items>
• Is the grounding wire securely installed to the indicated position?
• Isn't any harness caught?
• Is the appropriate screw used?
• After above confirmation, confirm the safety through the withstand voltage test or with
the insulation tester.
WARNING
Replacement of the paper size sensor PU (PSU) requires the substantial disassembly and
also reassembly. As the inappropriate assembly procedures and the wrong use of screws
affect the product safety and the product performance, the appropriate assembly procedures
and the caution items must be respected. (This work requires the insulation withstand
voltage test and the measurement of the insulation resistance.)
Fig. 5-104
Left tray guide PU
Room temp
thermistor PU
BT3
x
8
Paper size sensor PU
Left tray guide PU
Room temp
thermistor PU
Connecto
r
Connecto
r
tape
Connecto
r
tape
BT3
x
8
BT3
x
8
Connecto
r

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