and
Adjustment
4.1.6 CHARGE CORONA
1. Clean the corona wires with a dry cloth. Do not use sandpaper or solvent.
2. Clean the charge corona casing with water first to remove NOx based compounds. Then
clean it with alcohol if any toner still remains on the casing.
3. Clean the end block with a blower brush first to remove toner and paper dust. Then clean with
alcohol if any toner still remains.
4. Do not touch the corona wires with bare hands. Oil stains from fingers may cause uneven
image density on copies.
5. Make sure that the wires are correctly between the cleaner pads and that there is no foreign
material (iron filings, etc.) on the casing.
6. When installing new corona wires, do not bend or scratch the wire surface. Doing so may
cause uneven charge. Also be sure that the corona wires are correctly positioned in the end
blocks.
7. Clean the grid plate with a blower brush (not with a dry cloth).
8. Do not touch the charge grid plate with bare hands. Also, do not bend the charge grid plate or
make any dent in it. Doing so may cause uneven charge.
4.1.7 DEVELOPMENT
1. Be careful not to nick or scratch the development roller.
2. Place the development unit on a sheet of paper after removing it from the machine.
3. Never disassemble the development roller assembly. The position of the doctor plate is set
with special tools and instruments at the factory to ensure the proper gap between the doctor
blade and the development roller.
4. Clean the drive gears after removing used developer.
5. Dispose of used developer in accordance with local regulations.
6. Never load types of developer and toner into the development unit other than specified for
this model. Doing so will cause poor copy quality and toner scattering.
7. Immediately after installing new developer, the TD sensor initial setting procedure should be
performed with SP2801 (TD Sensor Initialization) to avoid damage to the machine. Do not
perform the TD sensor initial setting with used developer. Do not make any copies before
doing the TD sensor initial setting.
8. When using a vacuum cleaner to clean the development unit casing, always ground the
casing with your fingers to avoid damaging the toner density sensor with static electricity.
9. When replacing the TD sensor, replace the developer, then execute SP2801 (TD Sensor
Initialization) and SP2962 (Adjustment of Drum Conditions).
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