Troubleshooting Guide - Gestetner B147 Service Manual

4.5 TROUBLESHOOTING GUIDE

4.5.1 IMAGE QUALITY
Work-flow
The following work-flow shows the basic troubleshooting steps for the considerable
image quality problems on this product.
Make copy in the
enlargement or
reduction mode.
Location of
the image problem
shifted?
Yes
A
SM
Start
Verification of
problem reported
from users
Can the
problem be
duplicated?
Yes
Image Quality?
Yes
Copy Copy or Print?
Print
Make a test pattern
in SP5-997.
No
Colour related?
Possible Symptoms
Vertical white dotted lines
Yes
Check the transfer bias or paper
condition.
Vertical white lines on thick paper
Check the timing when the problem
occurs.
Dirty lines
Check the transfer belt cleaning section.
Poor fusing / Fusing offset
Check the paper types selected in the
printer driver.
Smeared image at trailing edge
Check the fusing unit speed.
Crow marks
Check the humidity condition and adjust
B
the transfer bias if necessary.
B146T901.WMF
4-55
TROUBLESHOOTING GUIDE
Ask customer to
No
duplicate it.
Troubleshoot using
No the service manual
or technical bulletin.
Troubleshoot
No depending on the
type of problem.
No problem on pattern
* Font problem
* Image data missing
Especially, problems
related to the above
symptoms and if no
problem is found on the
test pattern, it may be
related to the application
used or driver. Collect a
capture file for further
investigation (select
'Print to File' in the
driver).
B147/B149/B190