Brother MFC-8370DN Service Manual

3-41
Confidential
4. PAPER FEEDING PROBLEMS
Problems related to paper feeding are end user recoverable if following the User Check
items. If the same problem occurs again, follow each procedure in the order of the number
described in the Step column in the tables below.
4.1 No Feeding
4.2 Double Feeding
Step Cause Check Result Remedy
1
Dirt on PE sensor Is there paper powder in
the PE sensor?
Yes
Clean the PE sensnor.
2
Edge actuator
catching on some
position
Does the edge actuator
move smoothly? No
Re-assembly the edge
actuator.
3
Roller holder
ASSY catching on
some position
Does the roller holder
ASSY move smoothly? Yes
Re-assembly the roller
holder ASSY.
4
Separation pad or
roller holder ASSY
failure
Is the surface of the
separation pad or the
pickup roller dirty or worn
out?
Yes
1) Clean the surface of
the separation pad or
pickup roller.
2) Replace the separation
pad or pickup roller.
5
Pressure plate
gear damage
Is the pressure plate gear
damaged?
Yes
Replace the paper tray.
6
T1 solenoid failure Does the T1 solenoid
work correctly?
No
Replace the T1 solenoid.
7
T1 solenoid
pathway of the
high-voltage
power supply PCB
broken or
registration front
sensor failure
Is the problem solved
after replacing the high-
voltage power supply
PCB ASSY? Yes
Replace the high-voltage
power supply PCB ASSY.
8
Main PCB failure Is the problem solved
after replacing the main
PCB ASSY?
Yes
Replace the main PCB
ASSY.
9
Main motor failure Is the problem solved
after replacing the main
motor ASSY?
Yes
Replace the main motor
ASSY.
Step Cause Check
Result Remedy
1
Separation pad or
roller holder ASSY
failure
Is the surface of the
separation pad worn out? Yes
Replace the PF kit.

Brother MFC-8370DN Specifications

General

Duplex printing	Yes
Print technology	Laser
Maximum resolution	1200 x 1200 DPI
Time to first page (black, normal)	8.5 s
Print speed (black, normal quality, A4/US Letter)	28 ppm
Input color depth	48 bit
Optical scanning resolution	600 x 2400 DPI
Copier resize	25 - 400 %
Maximum copy resolution	1200 x 600 DPI
Maximum number of copies	99 copies
N-in-1 copy function (N=)	2, 4, 9, 16, 25
Copy speed (black, normal quality, A4)	28 cpm
Faxing	Mono faxing
Fax memory	500 pages
Modem speed	33.6 Kbit/s
Total input capacity	250 sheets
Total output capacity	150 sheets
Multi-Purpose tray input capacity	50 sheets
Auto document feeder (ADF) input capacity	20 sheets
Display	LCD
Product color	Grey, White
Market positioning	Home & office
Display number of lines	2 lines
Display number of characters	16
Card reader integrated	-
Sound power level (standby)	30 dB
Sound pressure level (printing)	56 dB
Paper tray media types	Bond paper, Envelopes, Labels, Plain paper, Recycled paper, Transparencies
Non-ISO print media sizes	Executive
ISO A-series sizes (A0...A9)	A4, A5, A6
ISO B-series sizes (B0...B9)	B5
Maximum ISO A-series paper size	A4
Multi-Purpose Tray media weight	60 - 163 g/m²
Standard interfaces	Ethernet, USB 2.0
USB 2.0 ports quantity	1
Dimensions (WxDxH)	531 x 451 x 475 mm
All-in-one functions	Copy, Fax, Scan
Color all-in-one functions	Scan
Power consumption (standby)	85 W
Power consumption (average operating)	680 W
Package weight	21100 g
Digital sender	No
Maximum duty cycle	- pages per month

Weight and Dimensions

Depth	443 mm
Width	390 mm
Height	442 mm