Contents

[1] PRODUCT OUTLINE . . . . . . . . . . . . . . . . . . . 1-1

1. Product features . . . . . . . . . . . . . . . . . . . . . . . . 1-1

2. System configuration (options) . . . . . . . . . . . . . 1-1

[2] PRODUCT SPECIFICATIONS . . . . . . . . . . 2-1

1. Basic specifications . . . . . . . . . . . . . . . . . . . . . . 2-1

2. Description of each section . . . . . . . . . . . . . . . . 2-2

3. Supply parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

4. Optional specifications . . . . . . . . . . . . . . . . . . . 2-4

(1) Automatic document feeder (ADF) . . . . . . 2-4

(2) Reverse automatic document feeder (RADF) . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

(3) 10-bin sorter . . . . . . . . . . . . . . . . . . . . . . . 2-4

(4) 10-bin staple sorter (10-bin SS) . . . . . . . . 2-5

(5) Two-step paper feed unit . . . . . . . . . . . . . 2-5

(6) One-step paper feed unit . . . . . . . . . . . . . 2-5

(7) Exclusive-use desk . . . . . . . . . . . . . . . . . . 2-5

[3] PRODUCT VIEWS . . . . . . . . . . . . . . . . . . . . . . 3-1

1. External view and internal structure . . . . . . . . . 3-1

2. Operation panel . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

3. Clutches, solenoids, and motors (Explained

with the SF-2120 and the SF-CM15) . . . . . . . . 3-4

4. PWB (Explained with the SF-2120 and the SF-CM15) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

5. Sensors and switches (Explained with the SF-2120 and the SF-CM15) . . . . . . . . . . . . . . . 3-6

6.Rollers, mirrors, etc. . . . . . . . . . . . . . . . . . . . . . 3-7

[4]UNPACKING AND INSTALLATION . . . . . 4-1

1. Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

2. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

(1) Environment . . . . . . . . . . . . . . . . . . . . . . . 4-1

(2) Space around the machine . . . . . . . . . . . . 4-2

(3) Installation base . . . . . . . . . . . . . . . . . . . . 4-2

(4) Power source . . . . . . . . . . . . . . . . . . . . . . 4-2

(5) Grounding wire connection . . . . . . . . . . . . 4-2

3. Optical system lock release . . . . . . . . . . . . . . . . 4-3 A. No. 2/3 mirror unit lock release . . . . . . . . . 4-3 B. Lens and No. 4/5 mirror unit lock release . 4-3

4. Charger cleaning . . . . . . . . . . . . . . . . . . . . . . . . 4-3 A. Main charger unit electrode cleaning . . . . 4-3 5. Developing unit setting . . . . . . . . . . . . . . . . . . . 4-4 A. Developing unit setting . . . . . . . . . . . . . . . 4-4

6. Toner density sensor level adjustment . . . . . . . 4-5 A. Developing unit level adjustment . . . . . . . 4-5 7. Accessory installation . . . . . . . . . . . . . . . . . . . . 4-5 A. Copier tray installation . . . . . . . . . . . . . . . 4-5

8.	Toner supply		. . 4-5
9.	Center shift adjustment		. . 4-7
10.	Label attachment		. . 4-7
	A.	Label attachment	. . 4-7
11. Optional two-step paper feed unit
	(SF-CM15) installation		. . 4-8
12. Optional one-step paper feed unit
	(SF-CM16)		. . 4-9
13. Tray paper size selection			. 4-11
[5] DESCRIPTIONS OF EACH SECTION			. . 5-1
(1)	Paper feed section		. . 5-1
	1)	General descriptions	. . 5-1
	2)	Basic operations	. . 5-1
(2)	Developing section		. . 5-2
	1)	General descriptions	. . 5-2
	2)	Basic composition	. . 5-2
	3)	Basic operations	. . 5-3
(3)	Optical section		. . 5-3
	1.	General description	. . 5-3
	2.	Basic operations	. . 5-6
(4)	Copy process		. . 5-8
	(1)	Photoconductor	. . 5-8
	(2)	Process diagram	. . 5-9
	(3)	Details of image forming process	. 5-10
	(4)	Transition of photoconductor surface
		potential	. 5-14
	(5)	Photoconductor drum sensitivity
		correction	. 5-14
	(6)	Process control function	. 5-14
(5)	TRANSPORT/FUSING SECTION		. 5-16
	1)	General	. 5-16
	2)	Basic composition and functions	. 5-16
(6)	Fusing paper exit section		. 5-16
(7)	High voltage section		. 5-17
	1)	General	. 5-17
	2)	Basic composition	. 5-17
(8)	ADU unit (SF-1120 only)		. 5-17

[6] DISASSEMBLY AND ASSEMBLY . . . . . . 6-1

1. Paper feed unit . . . . . . . . . . . . . . . . . . . . . . . . . 6-1 1-1. Paper feed unit . . . . . . . . . . . . . . . . . . . . . 6-1

1-2. Paper feed roller ass'y removal . . . . . . . . 6-1

1-3. PS front roller ass'y . . . . . . . . . . . . . . . . . 6-2

1-4. Separation roller . . . . . . . . . . . . . . . . . . . . 6-2

1-5. Paper feed roller, take-up roller . . . . . . . . 6-2

1-6. Lower paper feed unit . . . . . . . . . . . . . . . . 6-3

1-7. Lower separation roller . . . . . . . . . . . . . . . 6-3

Sharp SF-1120, SF-1020 service manual Contents

Models: SF-1120 SF-1020