Development - Ricoh MP 7503SP Field Service Manual

4. Replacement and Adjustment
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. Never touch the corona wires with bare hands. Oil stains from fingers can cause uneven image
density on copies.
5. Confirm that the wires are correctly installed between the cleaner pads and that there is no foreign
material (iron filings, etc.) on the casing.
6. When installing new corona wires, never 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. Never 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.

Development

1. Work carefully to avoid nicking or scratching 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 environmental laws and 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 scatter.
7. Immediately after installing new developer, the TD sensor initial setting procedure should be done
with SP2801 (TD Sensor Initialization) to avoid damage to the machine.
8. Never do the TD sensor initial setting with used developer. Do not make any copies before doing
the TD sensor initial setting.
9. 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.
10. When replacing the TD sensor, replace the developer, then execute SP2801 (TD Sensor
Initialization) and SP2962 (Adjustment of Drum Conditions).
Cleaning
1. When servicing the cleaning section, be careful not to damage the edge of the cleaning blade.
2. Do not touch the cleaning blade with bare hands.
468