18.2 How To Identify Problematic Part - Konica Minolta bizhub C353 Service Manual

Field Service Ver. 4.0 Jun. 2008

18.2 How to identify problematic part

• This chapter is divided into two parts: "Initial check items" and "Troubleshooting proce-
dure by a particular image quality problem."
• When an image quality problem occurs, first go through the "Initial check items" and, if
the cause is yet to be identified, go to "Troubleshooting procedure by a particular image
quality problem."
18.2.1 Initial check items
A. Initial check items 1
• Check first to see if image data is properly transmitted between scanner and memory,
and between memory and printer.
Enter the Service Mode, select [State Confirmation] → [Memory/
HDD Adj.] → [Memory Bus Check], and select and carry out
[Scanner→Memory] and [Memory→PRT] checks.
B. Initial check items 2
• Let the machine produce a test print and determine whether the image problem is attrib-
utable to the scanner or printer system.
Scanner
system
Printer
system
• Evaluation procedure
Image
problem
From [Service Mode], select [Test Mode] →
[Halftone Pattern] → [SINGLE] → [HYPER]
Lines,
→ [Gradation] → [C→M→Y→K] → [Density
bands
64], and produce a test print. Is image prob-
lem evident?
Action
Document scan
CCD board (CCDB)
Image processing board
(IPB)
PH relay board
(REYB/PH)
Action
18. Image quality problem
Result
OK Initial check items 2
NG P.535
(action as instructed)
I/F cable
MFP board (MFPB)
Print output
Result Cause
YES Printer
NO Scanner
Next Step
4038F4C508DA
Next step
Initial check items 3
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