Konica Minolta bizhub C658 Service Manual page 1628

bizhub C658/C558/C458/C368/C308/C258
[1]
[1] Faulty spot responsible for an image trouble of the
single-to- three-color system
16.2.2 Self-diagnostic function
Following give an overview of the self-diagnostic function.
• The self-diagnostic function makes a self-diagnosis of printed-wiring boards and electrical parts to determine whether they are fully
operational.
• Two methods are provided to activate the self-diagnostic function. The details are shown as follows: [Service Mode] -> [State Confirmation]
-> [Self-diagnostic] -> [Check All].
• Procedure (from SERVICE MODE menu)
• Procedure (from main power switch ON)
• When the self-diagnostic procedure is completed, "OK" or "NG" appears on the display. If "NG" appears, check the corresponding printed-
wiring board for proper connector connection or replace a faulty board with a good one.
• After completing the self-diagnostic, "Self-diagnosis result report" can be printed out. (Only when starting the self-diagnostic from main
power switch ON.)
Self-diagnostic (Check All) screen: Example
(1) Causes and countermeasures
Check name
DIMM R/W Check
On Board Memory Check
SSD Check
Cause of "NG" display
DIMM improperly installed, faulty DIMM, faulty CPU of MFP
board
Faulty MFP board, run-down battery
eMMC board improperly installed, faulty eMMC board, faulty
MFP board
K TROUBLESHOOTING > 16. IMAGE QUALITY PROBLEM
[2]
[2] Faulty spot responsible for an image trouble of the four-
color system
Reinstall the DIMM, replace the DIMM, replace
the MFP board
Replace the MFP board
Reinstall the eMMC board, replace the eMMC
board, replace the MFP board
K-300
Corrective action