Sharp SF-1020, SF-1120 service manual Lower heat roller replacement

	1-8.	Transport roller	. . . 6-3
	1-9.	Lower paper feed roller/take-up roller	. . . 6-3
2.	Transport unit		. . . 6-3
	2-1.	Resist roller, transfer roller	. . . 6-3
	2-2.	Transport belt	. . . 6-4
3.	Fusing section		. . . 6-5
	3-1.	Fusing unit removal	. . . 6-5
	3-2.	Heater lamp replacement	. . . 6-5
	3-3.	Upper heat roller ass'y removal	. . . 6-5
	3-4.	Upper separation pawl replacement . .	. . . 6-6
	3-5.	Lower heat roller replacement	. . . 6-6
	3-6.	Lower separation pawl replacement . .	. . . 6-6
	3-7.	Thermistor/thermostat removal	. . . 6-7
4.	Optical system		. . . 6-7
	1)	Copy lamp replacement	. . . 6-7
	2)	Mirror base wire replacement and
		adjustment	. . . 6-7
	3)	No. 2/3 mirror unit (mirror base B)
		installation (Mirror base B positioning)	. . 6-10
	4)	Copy lamp unit installation
		(Mirror base A positioning)	. . 6-11
	5)	No. 4/5 mirror unit (mirror base C)
		replacement	. . 6-11
	6)	Lens wire replacement	. . 6-13
	7)	Lens unit replacement	. . 6-15
5.	High voltage section		. . 6-16
	5-1.	Main charger (MC) unit	. . 6-16
	5-2.	Transfer/separation charger (TC/SC)
		unit	. . 6-17
6.	Process section		. . 6-17
	6-1.	Process unit	. . 6-17
	6-2.	Waste toner bottle replacement
		(required when waste toner full detection/
		maintenance)	. . 6-18
	6-3.	Drum (Replace every 50K copies) . . . . . 6-19
	6-4.	Blank lamp unit
		(Clean every 50K copies.)	. . 6-19
	6-5.	Discharge lamp unit
		(Clean every 50K copies.)	. . 6-19
	6-6.	Cleaner blade
		(Replace every 50K copies.)	. . 6-20
	6-7.	Drum separation pawl
		(Replace every 50K copies.)	. . 6-20
	6-8.	Process control PWB (Clean the sensor
		section every 50K copies.)	. . 6-20
	6-9.	Drum mark sensor PWB (Clean the sensor
		section every 50K copies.)	. . 6-20
	6-10.	Toner reception seal (Replace every 50K
		copies.)	. . 6-20
7.	Developing section		. . 6-20
	A.	DV side seals F/R replacement
		(Replace every 120K copies.)	. . 6-20

	B.	DB blade replacement
		(Replace every 120K copies.)	6-21
	C.	V ring attachment	6-21
	D.	Note for toner hopper drive gear (31T)
		and stirring shaft attachment	6-21
	G.	Developing unit color identification	6-22
8.	Operation panel/intermediate cabinet		6-22
9.	Frame major parts		6-22
	9-1.	Cooling fan motor replacement	6-22
	9-2.	Power unit	6-23
	9-3.	Tray size detecting PWB	6-23
	9-4.	Main PWB unit	6-24
	9-5.	AC power PWB	6-24
	9-6.	Ozone filter (Check every 50K copies,
		and clean every 100K copies.)	6-24
10.	Multi paper feed unit (SF-MF15: option)		6-25
	10-1.	Separation roller	6-25
	10-2.	Take-up roller/paper feed roller	6-25
11.	ADU (SF-1120 only)		6-26
12.	Paper feed unit
	(SF-CM15, SF-CM16, option)		6-27

[7] ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . 7-1

1.	Developing section		. 7-1
	1-1.	Developing doctor clearance
		adjustment	. 7-1
	1-2.	Developing magnet roller main pole
		position adjustment	. 7-1
2.	Optical system		. 7-2
	2-1.	Adjustment items	. 7-2
	2-2.	Note for adjustments	. 7-3
	2-3.	Adjustment of each section	. 7-4
	A.	Lens reference position adjustment . . . .	. 7-4
	B.	No.4/5 mirror reference position
		adjustment	. 7-4
	C.	Vertical copy magnification ratio
		adjustment	. 7-5
	D.	Resolution adjustment
		(Focus adjustment)	. 7-6
	E.	Horizontal copy magnification ratio
		adjustment	. 7-8
	F.	Comparison table of lens values and
		simulation input values	. 7-9
	G.	Vertical skew adjsutment	7-10
	H.	Horizontal skew adjustment	7-10
	I.	Center shift adjustment	7-12
	J.	Exposure balance adjustment	7-12
	K.	Copy lead edge adjustment	7-13
	2-4.	Original detecting section	7-15
	A.	Original detecting arm unit adjustment . .	7-15
	B.	Original detecting level adjustment . . . . 7-16
	2-5.	Copy density adjustment	7-17