KIP 9000 Service Manual page 525

7. 3. 2.16 Completely white
Cause Order
Position of Developer
Unit against Drum
Contact of Bias Pins
and Bias Plate
Connector of LED
Head
Transfer / Separation
Corona
High Voltage Lead
Line
Main Control PCB
(PW11520)
LED Head
7. 3. 2.17 Completely black
Cause Order
Image Corona
HVP1
Main Control PCB
(PW11520)
Checking matter
1 Is the Cam of pressurizing
mechanism placed at the correct
position for pressing the
Developer Unit to the Drum?
2 Are the Bias Pins on the Side
Plate surely contacted to the Bias
Plate of the Developer Unit? And
are Bias Pins and Bias Plate
provided with enough conductive
grease?
3 Is any connector of LED Head
disconnected?
4 Is the Corona Wire of Transfer
Corona broken?
5 Is the Transfer/Separation Corona
Unit properly installed?
6 Does a leak of high voltage occur
on the Transfer Corona?
7 Is the High Voltage Lead Line
connected between HVP3 and
Transfer Corona properly?
8 Is the resistance of High Voltage
Lead Line between HVP3 and
Transfer Corona about 10 ohms?
9 Can the issue be fixed by
replacing the Main Control PCB?
10 Can the issue be fixed by
replacing the LED Head?
Checking matter
1 Is the Corona Wire of Image
Corona broken? Or is the Corona
Wire not enough tensioned?
2 Is the Grid Plate dirty?
3 Is the Grid Plate installed
properly?
4 Does the current show -2.0 +/-
0.05mA, which is supplied from
HVP1 to Image Corona?
5 Can the issue be fixed by
replacing the Main Control PCB?
Result
No Check if the Developer Positioning
Motor or the pressurizing
mechanism has any abnormality.
No 1. Reinstall the Bias Pins to
contact them to the Bias
Plate.
2. Lubricate the Bias Pins
and the Bias Plate with
conductive grease.
Yes Connect it.
Yes Replace it.
No Install it properly.
Yes Clean the whole Transfer Corona.
Replace the Corona Wire if too dirty.
No Connect it properly.
No Replace the High Voltage Lead
Line.
Yes OK
Yes OK
Result
Yes 1. Replace the Corona Wire.
2. Check if the Tension Spring in
the Corona Block is deformed.
Yes Clean it. Replace it if too dirty.
No Install it properly.
No Adjust the current seeing [4.3.2
Checking & Adjustment of HVP1
(For Image Corona)] on the page 4-
68.
Yes OK
7-38
Treatment
Treatment
K115sm7e1.doc