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bizhub C4000i/C3300i
12.1.3 Level History 2
IDC Sensor Adjust 1
1st Transfer Output Value
2nd Transfer Output Value
12.2 Troubleshooting procedure overview
12.2.1 Test pattern printing
• Following give an overview of a procedure to isolate a faulty spot of an image trouble using a test pattern.
• A faulty spot that is responsible for an image trouble is isolated by printing a test pattern (Error diffusion) to determine whether an image
trouble is evident and determining which color of toner, Y, M, C, or K, has the trouble.
(1) Printer system image trouble
• If the image trouble is attributable to the printer system, determine whether the image trouble occurs with one to three colors, or with four
colors of Y, M, C, and K.
• If the same image trouble occurs with four colors, the image trouble is determined to be that of the four-color system.
[1]
[1]
Faulty spot responsible for an image trouble of the
single-to-three-color system
• Shows the IDC intensity adjustment value.
• The proper range is 100 to 500.
• The value becomes greater as the transfer belt unit has been used more.
• Relevant components: IDC sensor, transfer belt unit
• Shows the latest 1st transfer output value.
• The proper range is 800 to 2600.
• Relevant components: Transfer belt unit, High voltage unit (HVPS)
• Shows the latest 2nd transfer output value.
• The proper range is 330 to 4500.
• Relevant components: Transfer belt unit, High voltage unit (HVPS), 2nd transfer roller
[2]
L TROUBLESHOOTING > 12. IMAGE QUALITY PROBLEM
[2]
Faulty spot responsible for an image trouble of the four-
color system
L-85
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