K117sm7e2
7-26
7. 2. 2.12 Defective image placement, No Leading Edge
Correct leading margin is 5mm (+/-2mm).
Check the following matters with the Test Pattern No.1 S(0) and No.7 S(0).
If necessary use other Test Patterns.
Cause Checking
order
Checking Result Treatment
Setting of Leading
Registration
1 Is the Leading Registration or Leading
Margin properly adjusted in the Service
Mode?
No Adjust it properly.
Feed rollers 2 Have you used the feeding rollers for
very long term?
Yes Replace them.
Registration Clutch 3 Does the Registration Clutch operate
correctly without slipping?
No Replace Registration Clutch.
7. 2. 2.13 Jitter
Check the following matters with the Test Pattern No.1 S(0) and No.7 S(0).
If necessary use other Test Patterns.
Cause Checking
order
Checking Result Treatment
Photoconductive
Drum and its driving
mechanism
1 Does the jitter appear on the print
constantly keeping about 251mm of
interval?
Yes 1. Check if there is any
damage or foreign
substance on Pulley on
the drum shaft.
2. Check if there is any
foreign substance between
Drum and Counter Rollers
of Developer Unit.
Does the jitter appear on the print
constantly keeping about 3mm of
interval?
Yes Check the engagement of
Pulley Gear on the Drum
with Belt 4.
Developer Unit 2 Does the jitter appear on the print
constantly keeping about a certain
distance of interval listed below?
9.0mm
12.0mm
16.9mm
21.1mm
31.7mm
144.0mm
Yes Replace the Developer Unit
with a new one.
Fuser Unit 3 Does the jitter appear on the print
constantly keeping about 125mm of
interval?
Yes Check for Fuser Drive Gear,
attached foreign substance.
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