MX-6240N, MX-7040N (serv.man28). Section 9 Maintenance - Updated November 2012 - Sharp Copying Equipment Service Manual (repair manual). Page 9

MX-7040N  MAINTENANCE  9 – 9

Memo:
Note for cleaning the image registration/density sensor
When in maintenance or in case of a service call, refer to  "Criteria for necessity of cleaning" below to judge the necessity of cleaning the image

registration/density sensor. If it is judged that cleaning is necessary, then perform cleaning.
Criteria for necessity of cleaning
• The SIM44-2 “D” ~ “F”, “pcs_*_LED ADJ value” is increased by aging or dirt of the image density sensor.
• When the image density is decreased, execute Sim44-2. 

Then execute Sim64-74 “Copy color balance adjustment”.

Greasing
Greasing is not always required for every maintenance. In the following cases, check and grease.
• When there are some noises.
• When a lot of jams occur frequently. (Check the jam history.)

Cleaning of sensors and detectors in the paper feed/transport system
Cleaning of sensors and detectors in th e paper feed/transport system is not always required for every maintenance. In the following cases,

check and clean.
• When a trouble or a jam occurs due to a sensor or a detector. (Check the jam history.)

Torque limiter check and replacement
Torque limiter check and replacement is not always required for every maintenance. In the following cases, check and replace.
• When there are some noises.
• When a lot of jams occur frequently. (Check the jam history.)

Alcohol for cleaning
Be sure to use ethanol for cleaning.

Cleaning of the primary transfer mode detector (CL/BK)
• When replacing the OPC drum, remove the primary transfer unit and the developing unit, and clean them.
• Blow air to the light emitting section and light receiving section to remove the attached toner.
• Blow air also when the sensor is wiped and cleaned with waste cloth.