Table of Contents
Advertisement
7/13/2019
CHAPTER 6 TROUBLESHOOTING
8.
IMAGE DEFECTS
8.1
Image Defect Examples
I-1 Light
I-6 Black vertical
streaks
I-10 White horizontal
streaks
I-15 White spots
I-20 Downward fogging
of solid black
8.2
Diameter of Rollers
The diameter of each roller and the pitch which appears in the image are listed below;
No.
1
2
3
4
5
6
7
http://slidepdf.com/reader/full/brother-8840d-service-manual
I-2 Dark
I-2 Dark
I-3 Completely blank
I-6 Black vertical
I-7 Black horizontal
streaks
I-11 Faulty
I-12 Poor fixing
registration
I-16 Black spots
I-17 Black band
I-21 Horizontal lines
Parts Name
First Paper Feed Roller
Paper Feed Roller
Transfer Roller
Photosensitive Drum
Heat Roller
Pressure Roller
Development Roller
Brother 8840D Service Manual
I-4 All black
I-8 Black vertical
stripes
streaks
I-13 Image distortion
I-18 Gray background
I-23 Ghost
I-22 Light rain
Fig. 6-14
Diameter (The pitch which
appears in the image)
φ 13.6 mm (42.7 mm)
φ 14.0 mm (44.0 mm)
φ 15.20 mm (47.7 mm)
φ 29.97 mm (94.1 mm)
φ 25.0 mm (78.5 mm)
φ 25.0 mm (78.5 mm)
φ 20.0 mm (39.0 mm)
6-34
I-5 Dirt on back of paper
I-9 White vertical
streaks
o
n
t
r i
p
t
s
e
t
t
u
o
t
n
r i
P
o
n
t
r i
p
t
s
t e
t
u
t
o
r i
n
P
s
t
e
t t
u
o
t
n
r i
p
t
s
t t
e
u
o
t
n
r i
p
s
t
e
t
t
u
o
n
t
r i
P
Print out test print out test print out test Print out test print o
rint out test print out test print out test
rint out test print o
Print out test print o
o
n
t
r i
p
s
t
t
e
u
t
t
o
n
r i
P
o
n
t
p
r i
t
s
t e
u
t
t
o
n
r i
P
s
t
e
t t
o
u
n
t
r i
p
t
s
t
e
t
u
o
r i
n
t
p
t
s
e
t
t
o
u
n
t
r i
P
Print out test print out test print out test Print out test print o
rint out test print out test print out test
rint out test print o
Print out test print o
o
n
t
r i
p
s
t
e
t
u
t
t
o
n
r i
P
o
t
n
p
r i
s
t
t e
u
t
t
o
n
r i
P
t
s
e
t t
o
u
n
t
r i
p
s
t
t
e
u
t
o
r i
t
n
p
s
t
e
t
t
u
o
t
n
r i
P
Print out test print out test print out test Print out test print o
rint out test print out test print out test
rint out test print o
Print out test print o
o
n
t
r i
p
s
t
t
e
u
t
t
o
n
r i
P
o
n
t
p
r i
t
s
t e
u
t
o
t
n
r i
P
s
t
e
t t
o
u
n
t
r i
p
s
t
t
e
t
u
o
n
r i
t
p
s
t
e
t
t
u
o
t
n
r i
P
Print out test print out test print out test Print out test print o
rint out test print out test print out test
rint out test print o
Print out test print o
o
t
n
r i
p
t
s
t
e
t
u
t
o
r i
n
P
o
t
n
r i
p
s
t
t e
u
t
t
o
r i
n
P
s
t
e
t t
u
o
t
n
r i
p
s
t
e
t
t
u
o
n
r i
t
p
s
t
e
t
t
o
u
n
t
r i
P
Print out test print out test print out test Print out test print o
rint out test print out test print out test
rint out test print o
Print out test print o
o
t
n
r i
p
t
s
t
e
t
u
t
o
r i
n
P
o
t
n
p
r i
s
t
t e
u
t
t
o
r i
n
P
t
s
e
t t
u
o
n
t
r i
p
s
t
e
t
u
t
o
r i
n
t
p
s
t
e
t
t
o
u
t
n
r i
P
Print out test print out test print out test Print out test print o
rint out test print out test print out test
rint out test print o
Print out test print o
o
t
n
r i
p
s
t
t
e
t
u
o
t
r i
n
P
o
t
n
p
r i
t
s
t e
t
u
o
t
r i
n
P
t
s
e
t t
u
o
n
t
r i
p
t
s
t
e
t
u
o
t
n
r i
p
t
s
e
t
t
o
u
n
t
r i
P
Print out test print out test print out test Print out test print o
rint out test print out test print out test
rint out test print o
Print out test print o
o
n
t
r i
p
t
s
e
t
u
t
o
t
n
r i
P
o
n
t
p
r i
t
s
t e
u
t
t
o
n
r i
P
t
s
e
t t
u
o
n
t
r i
p
t
s
t
e
u
t
o
t
r i
n
p
s
t
e
t
t
o
u
t
n
r i
P
Print out test print out test print out test Print out test print o
rint out test print out test print out test
rint out test print o
Print out test print o
o
t
n
r i
p
s
t
e
t
t
u
o
t
n
r i
P
o
n
t
r i
p
s
t
t e
t
u
o
t
r i
n
P
s
t
e
t t
u
o
n
t
r i
p
s
t
t
e
u
t
o
r i
n
t
p
s
t
e
t
t
o
u
t
n
r i
P
Print out test print out test print out test Print out test print o
rint out test print out test print out test
rint out test print o
Print out test print o
o
n
t
r i
p
s
t
t
e
u
t
t
o
n
r i
P
o
t
n
r i
p
s
t
t e
t
u
t
o
n
r i
P
t
s
e
t t
o
u
n
t
r i
p
t
s
e
t
u
t
o
t
r i
n
p
t
s
e
t
t
u
o
t
n
r i
P
Print out test print out test print out test Print out test print o
rint out test print out test print out test
rint out test print o
Print out test print o
o
n
t
r i
p
t
s
e
t
u
t
o
t
n
r i
P
o
t
n
r i
p
t
s
t e
t
u
o
t
n
r i
P
t
s
e
t t
o
u
t
n
r i
p
s
t
e
t
u
t
o
r i
t
n
p
t
s
e
t
t
o
u
n
t
r i
P
Print out test print out test print out test Print out test print o
rint out test print out test print out test
rint out test print o
Print out test print o
o
n
t
r i
p
t
s
e
t
t
u
t
o
n
r i
P
o
n
t
r i
p
t
s
t e
t
u
t
o
n
r i
P
s
t
e
t t
o
u
n
t
r i
p
t
s
e
t
t
u
o
r i
n
t
p
t
s
e
t
t
o
u
t
n
r i
P
Print out test print out test print out test Print out test print o
rint out test print out test print out test
rint out test print o
Print out test print o
o
t
n
r i
p
t
s
t
e
t
u
t
o
r i
n
P
o
n
t
r i
p
s
t
t e
u
t
o
t
n
r i
P
t
s
e
t t
u
o
t
n
r i
p
t
s
e
t
u
t
o
r i
t
n
p
t
s
e
t
t
u
o
t
n
r i
P
Print out test print out test print out test Print out test print o
rint out test print out test print out test
rint out test print o
Print out test print o
I-14 Faint print
I-19 Hollow print
I-24 Toner specks
237/361
Advertisement
Chapters
Table of Contents
Troubleshooting
