Ricoh FW780 Service Manual - Page 126

6. SERVICE REMARKS 6.1 DRUM UNIT 6.1.1 Drum The organic photoconductor drum is comparatively more sensitive to light and ammonia gas than a selenium drum. 1. Never expose the drum to direct sunlight. 2. Never expose the drum to direct light of more than 1,000 Lux for more than a minute. 3. Never touch the drum surface with bare hands. When the drum surface is touched with a finger or becomes dirty, wipe with a dry cloth or clean with wet cotton. Wipe with a dry cloth after cleaning with wet cotton. 4. Never use alcohol to clean the drum; alcohol dissolves the drum surface. 5. Store the drum in a cool, dry place away from heat. 6. Take care not to scratch the drum as the drum layer is thin and is easily damaged. 7. Never expose the drum to corrosive gases such as ammonia gas. 8. Always keep the drum in the protective sheet when inserting or pulling the drum unit out of the copier to avoid exposing it to bright light or direct sunlight. This will protect the drum from light fatigue. 9. Before removing the drum, place a sheet of paper under the drum to catch any falling toner. 10. Dispose of used drums according to local regulations. 11. Perform the light sensor adjustment when a new drum is installed. 12. Hold both ends of the drum unit to carry it. 13. Be careful not to scratch the drum with the pick-off pawls when removing or reinstalling the drum. 14. When installing and/or removing the pick-off pawl unit, do not press too strongly. Otherwise, the drum unit may deform. A163 4-34 SM