How To Identify Problematic Part - Konica Minolta bizhub C250 Service Manual

Field Service Ver. 3.0 Aug. 2006

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 Sensor Board PWB-A
Image Processing Board
PWB-C
PH Interface Board
PWB-D
Action
18. Image quality problem
Result
OK Initial Check Items 2
NG P.458, P.454
(action as instructed)
I/F Cable
MFP Control Board
PWB-MFP
Test Print
Result Cause
YES Printer Initial Check Items 3
NO Scanner P.477
Next Step
4038F4C508DA
Next Step
475