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4.7.4 TD SENSOR
1. PCDU p.4-37)
2. Empty all developer from the development unit. 
p.4-46 "Developer")
3. Seal
4. TD sensor [A] 
x1)
The TD sensor is attached to the casing with double-sided tape [B]. Pry it off with the flat head of a screwdriver. Use fresh double-sided tape to re-attach the sensor.
5. Pour new developer into the development unit and perform the TD sensor initial setting using SP2-801.
When performing the TD sensor initial setting, cover the toner entrance hole with a piece of paper.