Olivetti d-Color MF4003 Service Manual page 524

d-Color MF4003/MF3303
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.
[8]
[3]
[1]
[3]
[4]
[6]
[2]
[1] Scanner system
[3] Document scan
[5] I/F cable (only front side)
[7] Print output
[9] DF CIS module (DF CIS)
(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.
Service Manual
• The proper range is 330 to 4500.
• Relevant components: Transfer belt unit, High voltage unit (HVPS), 2nd transfer roller
[9]
[5]
[7]
L TROUBLESHOOTING > 16. IMAGE QUALITY PROBLEM
[10]
[2] Printer system
[4] CIS module (IR CIS)
[6] Base board (BASEB)
[8] DF
[10] I/F cable (only back side)
L-126
Y119930-3