Canon imageRUNNER ADVANCE C5051 Series Service Manual page 458

How■to■use■the■test■print
■ 16■gradations■(TYPE=4) ■
■ Full■half■tone■(TYPE=5) ■
6
Troubleshooting■>■Test■Print■>■How■to■use■the■test■print■>■Full■half■tone■(TYPE=5)
This■test■print■is■for■mainly■checking■the■gradation,■fogging,■white■line■and■uneven■density■at■front■&■rear.
Check■item
Gradation
Fogging
White■line
Uneven■density■at■
front■&■rear
F-6-1
This■test■print■is■for■mainly■checking■the■black■line,■white■line■and■uneven■density.
MEMO:
1.■Select:■service■mode■>■COPIER■>■TEST■>■PG■and■specify■developing■color■"COLOR-Y/M/C/K"■to■output■the■print■by■
developing■color.
2.■To■change■the■density■of■test■print,■select:■service■mode■>■TEST■>■PG■>■DENS-Y/M/C/K■and■set■the■density.
Check■item
Transfer■failure
Black■line■
(color■line)
White■line
F-6-2
Uneven■pitch
Uneven■density
6 Troubleshooting■>■Test■Print■>■How■to■use■the■test■print■>■Full■half■tone■(TYPE=5)
Check■method
Check■that■16■density■gradation■is■properly■reproduced.
Check■that■fogging■occurs■on■white■image■area■only.
Check■that■white■line■does■not■appear■on■entire■image.
Check■that■uneven■density■does■not■appear■at■front■&■rear.
Check■method
Check■that■the■transfer■failure■does■not■appear■on■entire■image. Failure■of■ITB■(scratch,■dirt)
Check■that■black■line■does■not■appear■on■entire■image.
Check■that■white■line■does■not■appear■on■entire■image.
Check■that■uneven■pitch■does■not■appear■on■entire■image.
Check■that■uneven■density■does■not■appear■on■entire■image.
Assumed■cause
Failure■of■Drum■Unit■(end■of■life)
Failure■of■Laser■Scanner■Unit
Failure■of■Drum■Unit■(end■of■life)
Failure■of■Laser■Scanner■Unit
Failure■of■Developing■Assembly
Failure■of■Photosensitive■Drum■(approx.■94mm)
Failure■of■Developing■Cylinder■(approx.■63mm)
Assumed■cause
Failure■of■Primary■Transfer■Roller■(scratch,■dirt)
Failure■of■Secondary■Transfer■Roller■(scratch,■dirt)
Scratch■on■Photosensitive■Drum
Dirt■on■Primary■Charging■Roller
Failure■of■ITB■Unit
Failure■of■Secondary■Transfer■Outer■Roller
Dirt■on■laser■light■path
Failure■of■Photosensitive■Drum■(approx.■94mm)
Failure■of■Developing■Cylinder■(approx.■94mm)
Dirt■on■Dustproof■Glass
Deterioration■of■ITB
6-4
T-6-3
T-6-4
6-4