K117sm7e2
7-20
7. 2. 2. 3 The whole image is extremely light
Check the following matters with the Test Pattern No.1 S(0) and No.3 S(0).
If necessary use other Test Patterns.
Cause Checking
order
Checking Result Treatment
1 Try to readjust each image creation
component according to [7.2.1 Basic
Image Adjustment].
Is the problem fixed?
Yes OK
Paper 2 Can you fix the problem if you use a
newly unpacked paper?
Yes 1. If the paper was
humidified, instruct the
customer of the way store
the paper.
2. If the paper was not the
specified one, explain the
customer that some
image problem may
occur in that case.
Process Unit 3 Is the Process Unit seated by the 4
thumb screws properly?
No Reseat the Process Unit and
fix it with the thumb screws
properly.
Reinstall the drive belt.
4 Turn off the machine in the middle of
printing, and then check the toner
image on the Drum.
Is the toner image looks normal?
Yes Go on to the step 5.
No Go on to the step 8.
Transfer Corona 5 Is the Transfer/Separation Corona
installed to the machine correctly?
No Install it correctly.
Is the high voltage of Transfer Corona
leaking?
Yes Clean the Transfer Corona.
Lead Wire 6 Is the resistance of Lead Wire about 10
kilo ohms, which connects HV Power
Supply and the Transfer Corona?
No Replace the Lead Wire.
Input voltage to the
Transfer Corona
7 Is a correct voltage inputted from the
HV Power Supply to the Transfer
Corona?
No Readjust the input voltage.
Replace the HV Power
Supply PCB.
Driving mechanism
of Developer Unit
8 Is the Developer Unit driving normally? No Check the driving
mechanism.
Developer Unit 9 Is the Developer Unit firmly pressed
toward the Drum? (Are Counter Rollers
at both sides of the Developer Roller
touch the Drum)
No Remove the Developer Unit,
and then install it to the
machine correctly.
Lead Wire 10 Is the Lead Wire to supply the
Developer Bias correctly connected?
No Connect the Lead Wire
correctly.
Developer Bias 11 Is the Developer Unit supplied with the
Developer Bias correctly?
No Check the contact points of
Developer Bias, and also
check the HV Power Supply.
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