Konica Minolta bizhub C658 Service Manual page 1627

bizhub C658/C558/C458/C368/C308/C258
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 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.
[9]
[3]
[1]
[3]
[4]
[6]
[2]
[7]
[1] Scanner system
[3] Document scan
[5] I/F cable (when DF-629 is mounted; and only for the front
side for bizhub C368/C308/C258 mounted with DF-704
and for bizhub C658/C558/C458)
[7] PH relay board (PHRYB)
[9] DF-629 / DF-704 / Dual scan document feeder
[11] Dual scan image processing board (DSIPB)
(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.
[10]
[5]
[8]
K TROUBLESHOOTING > 16. IMAGE QUALITY PROBLEM
[12]
[11]
[2] Printer system
[4] CCD board (CCDB)
[6] MFP board (MFPB)
[8] Print output
[10] CIS module (CIS)
[12] I/F cable (only for the back side for bizhub C368/C308/
C258 mounted with DF-704 and for bizhub C658/C558/
C458)
K-299