9.6 Potential Sensor
• Blow air to remove toner and dust from the electrode of the potential sensor. To prevent clogging or jamming, do not use
a rag.
9.7 Charge, Pre-cleaning, and Transfer/Separation Corona Units
• Clean the unit casings with water first to remove NOx. Then clean them with alcohol if any toner still remains on the casings.
• The corona wires can be cleaned only with a dry soft cloth. Using water or alcohol might damage the coating of the wire
surface.
9.8 Cleaning Unit
• When you pull out the cleaning unit and turn the cleaning knob, toner will fall from the toner exit pipe of the unit. When
you do this, place a sheet under the toner exit pipe to prevent the OPC unit from becoming dirty by toner.
• Never put in cleaning carrier on the left side (scavenging roller side).
• The air filters have a setting direction. Be sure that the side with a red line on the edge is facing the inside of the unit.
• Because the slide guides have sharp edges, keep them in the main body while servicing.
• Lay paper in place where the cleaning unit is put. Be sure there is no metal debris present that can cause damage. Metal
screws, paper clips, etc. attracted by the cleaning roller can scratch the roller and blade.
• Because the cleaning unit has no horizontal agitating roller, do not tilt the unit when the cleaning carrier is in the unit.
• When the cleaning carrier is in the cleaning unit, do not turn the unit up side down.
9.9 Development Unit
• When you use a vacuum cleaner to clean the development unit, heavy electrostatic will occur. To avoid damage of electrical
parts, be sure to do the following:
(1) Pull out the toner density control board.
(2) Disconnect the harness from the ID sensor board and ground the board using the
development unit grounding harness (copier accessory).
• Collect the developer by turning the development knob before pulling out the unit. It might scatter, or damage the OPC.
• The air filter has a setting direction. Be sure that the side with a red line on the edge is facing the inside of the unit.
• Clean the developer around the air filter case as the place is very close to the OPC surface. If this is not done, the OPC
may be damaged.
• Do not lubricate the sleeve gears and the other gears in the development unit to avoid toner adhering to the gears. Lubricate
the two projections of the unit drive joint roller with a small amount of G-40M when the unit does not slide in the main body
smoothly.
• No developer should be allowed to fall on the toner density control board. Otherwise the board might be damaged.
• Because the slide guides have sharp edges, keep them in the main body while servicing.
Potential Sensor 1 July 1994
9-4
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