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MX-6500N, MX-7500N (serv.man18). Section 4 External view and Internal Structure - Sharp Copying Equipment Service Manual (repair manual). Page 19

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MX-7500N  EXTERNAL VIEW AND INTERNAL STRUCTURE  4 – 19
12. Heater
*: Option
Signal name
Name
Function/Operation
WH_CS3 *
Paper dehumidifying heater 
(Paper feed tray 4)
Dehumidifies the paper feed tray section to prevent paper from absorbing humidity which causes 
degraded image quality and paper jams.
WH_LSU
LSU heat-retention heater
Dehumidifies the LSU section to prevent it from dew condensation.
WH_S1
Scanner heat-retention heater
Dehumidifies the scanner section to prevent it from dew condensation.
WH_TND *
Paper dehumidifying heater 
(Paper feed tray 1, 2)
Dehumidifies the paper feed tray section to prevent paper from absorbing humidity which causes 
degraded image quality and paper jams.
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