Sharp SF-1020, SF-1120 service manual No trouble 31 ∼ 35 --- Trouble The sub code is displayed

Main code	Sub code						Content
44	08	Grid voltage correction, optical dirt correction, drum membrane decrease correction data display
		Used to display each correction data of the grid voltage correction, the optical dirt correction, and the drum
		membrane decrease correction on the copy quantity display.
		Since there are two or more display items, the third digit is used to make distinction between the light reception
		level and the original judgment level, and the lower two digits are used to display the data.
		The display is selected by the magnification ratio key.
			Copy quantity display				Display data
			3rd digit	2nd, 1st digits
			A		8 ∼ 99	Patch forming grid voltage (initial value)
						Gird voltage when the display value is 50 = 410V
						When the display value is decreased by 1, the grid voltage is decreased
						by 5V.
						When the display value is increased by 1, the grid voltage is increased by
						5V.
			b		1 ∼ 99	Normal mode grid voltage (initial value)
						Display value × 10V is the grid voltage output.
			C		0 ∼ 99	Optical dirt correction reference value
						The AE sensor input value measured after execution of SIM 46-1.
						(Converted into a decimal number and displayed.)
			d		0 ∼ 99	Drum rotating time (accumulated value)
						When the display value is increased by 1, it corresponds to one hour.
			E		0 ∼ 99	DV unit (black) rotating time (accumulated value)
						When the display value is increased by 1, it corresponds to one hour.
	09	Grid voltage correction, optical dirt correction, drum membrane decrease correction data display (the newest value)
		Used to display each correction data of the grid voltage correction, the optical dirt correction, and the drum
		membrane decrease correction on the copy quantity display.
		Since there are two or more display items, the third digit is used to make distinction between the light reception
		level and the original judgment level, and the lower two digits are used to display the data.
		The display is selected by the magnification ratio key.
			Copy quantity display				Display data
			3rd digit		2nd, 1st digits
			A		8 ∼ 99		Patch forming grid voltage (latest value)
							Gird voltage when the display value is 50 = 410V
							When the display value is decreased by 1, the grid voltage is
							decreased by 5V.
							When the display value is increased by 1, the grid voltage is
							increased by 5V.
			b		1 ∼ 99		Normal mode grid voltage (latest value)
							Display value × 10V is the grid voltage output.
			C		0 ∼ 10		Optical dirt correction reference value
							Display value × 0.7V = Copy lamp voltage correction value
			d		0 ∼ 20		Drum membrane decease correction value
							Drum membrane decease correction value when normal mode exp. 1
			E		0		Trouble data display when the grid voltage correction is performed.
					31 ∼ 35		0 --------- No trouble
							31 ∼ 35 --- Trouble (The sub code is displayed.)

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