Specifications

1.3 UNEVEN IMAGE DENSITY
- Phenomenon -
Uneven image density appears on the copies.
- Possible Cause -
1. Dirty optics
2. Uneven exposure lamp horizontal position.
3. Dirty corona wires or grid
4. Uneven height of charge corona wire.
- Action -
Does the uneven image area shift when a reduction copy is made?
No Yes
Is the optics section dirty?
No Yes
Clean the optics.
If the filaments at both the front and rear ends of exposure lamp are not
aligned with the holes on the reflector cover, adjust the exposure lamp
position (horizontal direction) or adjust the wings (adjusting plates) on
the 1st scanner.
Is the erase lamp, quenching lamp, and/or toner shield glass dirty?
No Yes
Clean the erase lamp, quenching lamp, and/or toner shield glass.
Are the corona wires and/or grid plate dirty?
No Yes
Clean the corona wires, grid plate, and casings.
Adjust the charge corona wire height using a drum shoe.
1 December 1990
6-7