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■ MCYBk horizontal stripe (TYPE=10)
This test print is for mainly checking the dark area density of each color, each color balance and white line on development.
Check items
Uneven density
Black line (color line)
White line
■ 64-gradations (TYPE=12)
This test print is for mainly checking the gradations of YMCBk single color at one time.
Check item
Gradation
Fogging
4.0+1.5/-1.0mm
2.5 +1.5mm/-1.5mm
Check method
Check that uneven density does not appear
on solid area of each color
Check that black line (color line) does not
appear on solid area of each color
Check that white line does not appear on
solid area of each color
Check method
Check that 64 gradations density is properly
reproduced.
Check that fogging appears on white image
area only.
Failure of Laser Scanner Unit
Failure of developer in Developing Assem-
bly
Failure of Primary Transfer Roller
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 Drum Unit (end of life)
Failure of Laser Scanner Unit
Failure of Drum Unit (end of life)
Failure of Laser Scanner Unit
445
6. Troubleshooting
Assumed cause
Assumed cause
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Table of Contents
Troubleshooting
