MX-FN27. Service Manual for N Version - Sharp Copying Equipment Service Manual (repair manual). Page 42

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MX-FN27 N, MX-PN14  OPERATIONAL DESCRIPTION  6 – 16
B. Stack Tray Paper Height Detection Control
The height of the paper stack on the stack tray is detected by the Stack tray paper height sensor (FNPS9). After paper has been delivered to the stack
tray, the stack tray moves down by the specified amount.
Next, the stack tray moves up until the Stack tray paper height sensor (FNPS9) turns on (the top surface of the paper on the stack tray is
detected).The tray is moved down once again and stopped where the stack tray paper height sensor (PS9) turns off.
The above operations are repeated each time paper is delivered to the stack tray to detect the paper height.
However, there are situations in which paper height detection is not performed depending on the print conditions.
C. Stack Tray Paper Full Detection
The stack tray paper full state is detected by the Stack tray paper height sensor (FNPS9) and Stack tray lower limit sensor (FNPS10).
The stack tray paper full state is detected in the following conditions.
– At power ON, if both the Stack tray paper height sensor (FNPS9) and Stack tray lower limit sensor (FNPS10) are on.
– When the stack tray moves down by the specified amount after paper is delivered to the stack tray, the Stack tray lower limit sensor (FNPS10) turns
on.
– When a stack height higher than the height equivalent to 500 small-size sheets is detected.
– When the internal counter*1 detects that 30 or more copies of stapled or staple-free stapled paper stacks have been delivered.
– When the internal counter*1 detects that 250 or more large-size sheets have been delivered.
– When the internal counter*1 detects that 250 or more sheets that include a mixture of small-size and large-size sheets have been delivered.
– When the internal counter*1 detects that 10 envelops have been delivered continuously.
– When the internal counter*1 detects that 20 postcards have been delivered continuously.
– When the internal counter*1 detects that 20 Tab papers, OHPs or Labels  have been delivered continuously.
 *1 : The internal counter's sheet count and copy count are cleared in the following situations.*1
– When the paper stack on the stack tray is removed.
– When the power is turned off and then back on.
Stack tray paper height sensor (FNPS9)
  
Stack tray paper height sensor (FNPS9)
Stack tray lower limit sensor (FNPS10)
ON 
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