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Konica Minolta magicolor 1600W Service Manual - Page 77

Retraction sequence, 2nd transfer roller cleaning, Operation timing

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magicolor 1600W magicolor 1650EN 13. 2ND TRANSFER SECTION/ MEDIA SEPARATION Theory of Operation Ver. 1.0 Nov. (1) Retraction sequence 1. When the 2nd image transfer pressure/retraction solenoid (SD4) is energized in the condition in which the 2nd transfer roller is pressed against the transfer belt, the Pressure/retraction clutch rotates a half turn. This moves the Pressure slider. 2. When the Pressure slider is moved, the 2nd transfer assy, which has been pushed up by the ribs on the Pressure slider, lowers. 3. When the 2nd transfer assy lowers, it allows the 2nd transfer roller to be retracted from the transfer belt. 2nd image transfer pressure/retraction solenoid (SD4) 2nd transfer assy Ribs COMPOSITION/ OPERATION Pressure slider Pressure/retraction clutch A034T2C536AA 13.3.2 2nd transfer roller cleaning • DC positive and negative transfer bias voltages are alternately applied to the 2nd transfer roller. This allows toner residue on the surface of the 2nd transfer roller to be transferred back to the transfer belt, thus cleaning the 2nd transfer roller. • The toner transferred back to the transfer belt is collected by the cleaning blade. 2nd transfer roller Transfer belt 4139to2082e1 A. Operation timing • The machine performs a cleaning sequence if it detects a sheet of paper having a length shorter than the length of the specified paper type. • The cleaning sequence is also carried out during a resetting sequence following a paper misfeed and the opening of the door during a print cycle. 50

Section	Page
THEORY OF OPERATION TOTAL CONTENTS	2
SAFETY AND IMPORTANT WARNING ITEMS	4
IMPORTANT NOTICE	4
DESCRIPTION ITEMS FOR DANGER, WARNING AND CAUTION	4
SAFETY WARNINGS	5
4.1 Internal Laser Radiation	16
4.2 Laser Safety Label	19
4.3 Laser Caution Label	20
4.4 PRECAUTIONS FOR HANDLING THE LASER EQUIPMENT	20
SAFETY INFORMATION	21
IMPORTANT NOTICE	21
INDICATION OF WARNING ON THE MACHINE	22
MEASURES TO TAKE IN CASE OF AN ACCIDENT	25
Composition of the service manual	26
Notation of the service manual	27
magicolor 1600W/1650EN Main body	28
CONTENTS	30
OUTLINE	34
1. System configuration	34
2. Product specifications	35
3. Center cross section	39
4. Media path	40
COMPOSITION/OPERATION	42
5. Overall composition	42
5.1 Control block diagram	42
5.2 Image creation process	43
5.3 Operation sequence	44
6. Interface section	45
6.1 Composition	45
6.1.1 magicolor 1600W	45
6.1.2 magicolor 1650EN	45
7. Write section (PH section)	46
7.1 Composition	46
7.2 Operation	47
7.2.1 Outline	47
7.2.2 Laser exposure process	47
7.2.3 Laser emission area	48
7.2.4 Image stabilization control item	48
8. IMAGEING CARTRIDGE SECTION	49
8.1 Composition	49
8.2 Drive	50
8.3 Operation	50
8.3.1 Imaging cartridge (IC) life control	50
9. Photo conductor section	51
9.1 Composition	51
9.2 Drive	51
9.3 Operation	52
9.3.1 Photo conductor drive mechanism	52
9.3.2 Photo conductor cleaning mechanism	52
10. Charge corona section	53
10.1 Composition	53
10.2 Operation	53
10.2.1 Charge corona control	53
11. Developing section	54
11.1 Composition	54
11.2 Drive	55
11.3 Operation	55
11.3.1 Toner flow	55
11.3.2 Toner Cartridge Rack	56
11.3.3 Developing Roller drive	62
11.3.4 Developing bias	63
11.3.5 Developing system	63
11.3.6 Toner cartridge (TC) life control	64
11.3.7 Image refresh mode	64
12. 1st transfer section	65
12.1 Composition	65
12.2 Drive	66
12.3 Operation	67
12.3.1 1st transfer output control	67
12.3.2 Transfer belt cleaning mechanism	67
12.3.3 Cleaning blade pressure/retraction mechanism	68
12.3.4 Belt Positioning Sensor	71
12.3.5 ATVC (Auto transfer voltage control)	72
12.3.6 Image stabilization control item	73
13. 2ND TRANSFER SECTION/ MEDIA SEPARATION	74
13.1 Composition	74
13.2 Drive	75
13.3 Operation	76
13.3.1 2nd transfer roller pressure/retraction control	76
13.3.2 2nd transfer roller cleaning	77
13.3.3 Neutralization and separation of media	78
14. Toner collecting section	79
14.1 Composition	79
14.2 Drive	79
14.3 Operation	80
14.3.1 Toner collecting mechanism	80
14.3.2 Waste toner near full detection system	81
15. Media feed section	82
15.1 Composition	82
15.2 Drive	83
15.3 Operation	84
15.3.1 Up/down control	84
15.3.2 Paper feed control	85
15.3.3 Double feed prevention mechanism	85
15.3.4 Remaining media detection control	85
15.3.5 Media feed retry function	86
16. Fusing section	87
16.1 Composition	87
16.2 Drive	88
16.3 Operation	88
16.3.1 Fusing temperature control	88
16.3.2 Wait control	89
16.3.3 Print control	90
16.3.4 Protection against abnormally high temperature	90
16.3.5 PPM control	91
17. Media exit section	92
17.1 Composition	92
17.2 Drive	93
17.3 Operation	93
17.3.1 Conveyance control	93
18. Image stabilization control	94
18.1 Overview	94
18.2 Operation	95
18.2.1 Leak detection control	95
18.2.2 IDC sensor LED intensity control	95
18.2.3 Transfer belt surface correction control	95
18.2.4 Control of the maximum amount of toner sticking	95
18.2.5 Laser intensity adjustment control	95
18.2.6 g correction control	95
18.3 Operation timing	96
18.4 Operation flow	96
19. Fan control	97
19.1 Composition	97
19.2 Operation	97
19.2.1 Function	97
19.2.2 Control conditions	98
Lower Feeder Unit	100
CONTENTS	102
OUTLINE	104
1. Product specifications	104
1.1 Type	104
1.2 Paper type	104
1.3 Machine specifications	104
1.4 Operating environment	104
COMPOSITION/OPERATION	106
2. Composition	106
3. Drive	107
4. Operation	108
4.1 Conveyance drive mechanism	108
4.2 Media Empty Detection	109
Duplex Option	110
CONTENTS	112
OUTLINE	114
1. Product specifications	114
COMPOSITION/OPERATION	116
2. Composition	116
2.1 Duplex option	116
2.2 Attachment	117
3. Drive	118
3.1 Duplex option	118
3.2 Attachment	118
4. Operations	119
4.1 Switchback mechanism	119
4.1.1 Switchback operation	119
4.1.2 Exit roller drive coupling mechanism	119
4.1.3 Switchback Motor Control	120
4.2 Transport and duplex media take-up mechanism	121
4.2.1 Transport and duplex media take-up operation	121
4.2.2 Duplex init transport motor control	121
4.2.3 Media path during take-up of media from the duplex option	121
4.2.4 Loop correction control	122
4.3 Fan control	122
4.3.1 Composition	122
4.3.2 Operation	122
4.3.3 Control condition	122
4.4 2-sided printing method	123
4.4.1 Operations in 2-sided printing with a single sheet of media resident in the system	123