d-Color MF4003/MF3303
L TROUBLESHOOTING > 16. IMAGE QUALITY PROBLEM
L-126
• The proper range is 330 to 4500.
• Relevant components: Transfer belt unit, High voltage unit (HVPS), 2nd transfer roller
16.2Troubleshooting procedure overview
16.2.1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)Scanner system image trouble
• If an image trouble occurs during a copy cycle, use the image trouble that may be evident on the test pattern printed to determine
whether the trouble is attributable to the scanner system or the printer system.
• If no image trouble occurs on a test pattern produced following a print cycle, the image trouble is determined to be attributable to the
scanner system.
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[3]
[9]
[8]
[10]
[1] Scanner system [2] Printer system
[3] Document scan [4] CIS module (IR CIS)
[5] I/F cable (only front side) [6] Base board (BASEB)
[7] Print output [8] DF
[9] DF CIS module (DF CIS) [10] I/F cable (only back side)
(2)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.
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