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PREVENTIVE MAINTENANCE (PM)
7 - 31
* 19. Thermistor
Clean the thermistor with alcohol if the toner or dirt is adhered on it while the fuser unit is
reassembled or disassembled, such as the case the fuser roller is replaced.
Do not deform or damage the thermistor during the cleaning. Replace the thermistor with a
new one if it is damaged or deformed regardless of degree.
* 20. Toner bag
Be sure to check the amount of the used toner in the toner bag before starting the
preventive maintenance. Tap the toner bag to even out the surface of the used toner, and
if this top surface is higher than 180 mm from the bottom of the toner bag, replace the bag.
Photoconductive drum defects may increase the used toner amount. Therefore be sure to
check the used toner amount in the bag when the drum has been replaced.
In addition, whenever fogging on the photoconductive drum increases, be sure to check
the used toner amount in the toner bag.
* 21. Developer motor unit
When an abnormal noise occurs in the developer unit, apply white grease (Molykote EM-
30) to the areas described below.
• The shaft of the developer motor
• Between the drive pulleys and the E-rings
<< Method of applying white grease (Molykote EM-30) >>
* 22. Discharge LED
Clean with soft pads or cloth. Do not use a vacuum cleaner.
(1) Take off the developer motor unit.
(2) Remove 2 E-rings and take off the pulleys
and belt.
Fig. 7-29
(3) Apply white grease (Molykote EM-30) to the
places shown below.
• Motor shaft (arrow A) :
About 3 small drops
• E-rings (arrow B ; 2 places) :
About 2 small drops
* Apply to the surface contacting the
pulleys.
Fig. 7-30
E-ring
Belt
Pulley
A
B
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