RICOH FT8780
Manual de Servicio

SERVICE REMARKS

6 March 1992

1.2 CHARGE CORONA UNIT
1. Clean the charge corona casing with water first to remove NOx. Then clean it with alcohol if any toner still remains on the casing. 2. The corona wires can be cleaned only with a dry soft cloth. Using water or alcohol may damage the coating of the wire surface. 3. Clean the end blocks with blower brush first to remove toner and paper dust. Then clean them with alcohol if any toner still remains on them. 4. Do not touch the corona wires with bare hands. It may cause white lines or bands on copies. 5. Make sure that the corona wires are positioned between the cleaner pads and there is no foreign material (iron filings, etc.) on the casing. 6. When installing the corona wires, do not bend or scratch the wire to avoid any uneven charge. Also make sure that the wires are correctly set in the grooves of the end blocks (see charge corona replacement). 7. The corona wire height must be adjusted when the front end block or front end block cover are replaced.

1.3 OPTICS
1. When installing the exposure glass, make sure that the white marked side of the glass faces up. This side is specially treated against anti-static electricity. 2. When installing the left top cover, use only shorter screws for mounting it. Longer screws may interfere with the scanner movement. 3. Do not touch the following parts with bare hands: a) Reflectors b) Mirrors and lens c) ID sensor, ADS, Vd, and VL patterns 4. Do not loosen any screws with white paint. They were fixed in the factory with special tools. 5. Do not bend or crease the exposure lamp flat cable and fiber optics cables. 6. When replacing the exposure lamp, make sure that the fiber optics cable for the intensity sensor is correctly positioned. 7. To clean the mirrors and lens, only use a clean soft cloth damped with alcohol or water, or a silicone cloth.

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