KIP 700m - 7. 2. 2. 2 Halftone and solid black are too light

K117sm7e2
7-19
7. 2. 2. 2 Halftone and solid black are too 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
2 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 3.
No Go on to the step 7.
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.
Transfer Corona 4 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.
Paper 5 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.
Lead Wire 6 Is the resistance of Lead Wire about 10
kilo ohm, which connects the HV Power
Supply and the Transfer Corona?
No Replace the Lead Wire.
Input voltage to the
Transfer Corona
7 Is a correct voltage supplied from the
HV Power Supply to the Transfer
Corona?
No Readjust the input voltage.
Replace the HV Power
Supply PCB.
Dirt of the LED
Head
8 Is the LED Head dirty? Yes Clean it.
Developer Unit 9 Is the Developer Roller evenly covered
with the toner?
No Check the whole Developer
Unit to find the cause.
10 Is the Developer Unit firmly pressed
toward the Drum?
No Remove the Developer Unit,
and then install it to the
machine correctly.
Installation of
Developer Unit
11 Is the driving gear on the right of the
Developer Unit surely fitted to the
driving mechanism on machine side?
No Check the concerning gears.
Toner Sensor 12 Is there enough toner in the Developer
Unit?
No 1. Check the wire or the
connector connected to
the Toner Sensor.
2. Check the Toner Supply
Motor.
3. Check the proper amount
of toner remains in the
Hopper Unit.
4. Check the Toner Sensor.
Yes Replace the Process Unit.