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Konica Minolta magicolor 1690MF Service Manual - Page 81

Retraction sequence, 2nd transfer roller cleaning, Operation timing

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magicolor 1680MF magicolor 1690MF 14. 2nd transfer section/ media separation Theory of Operation Ver. 1.0 Nov. 2008 (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 14.3.2 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. 54

Section	Page
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 1680MF/magicolor 1690MF 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 1680MF	45
6.1.2 magicolor 1690MF	46
7. Scanner section	47
7.1 Composition	47
7.2 Drive	48
7.3 Operation	49
7.3.1 When the Start key is pressed	49
7.3.2 Home position detection	50
7.3.3 Shading compensation	50
8. Write section (PH section)	51
8.1 Composition	51
8.2 Operation	52
8.2.1 Outline	52
8.2.2 Laser exposure process	52
8.2.3 Laser emission area	53
8.2.4 Image stabilization control item	53
9. Imageing cartridge section	54
9.1 Composition	54
9.2 Drive	55
9.3 Operation	55
9.3.1 Imaging cartridge (IC) life control	55
10. Photo conductor section	56
10.1 Composition	56
10.2 Drive	56
10.3 Operation	57
10.3.1 Photo conductor drive mechanism	57
10.3.2 Photo conductor cleaning mechanism	57
11. Charge corona section	58
11.1 Composition	58
11.2 Operation	58
11.2.1 Charge corona control	58
12. Developing section	59
12.1 Composition	59
12.2 Drive	60
12.3 Operation	60
12.3.1 Toner flow	60
12.3.2 Toner Cartridge Rack	61
12.3.3 Developing Roller drive	67
12.3.4 Developing bias	67
12.3.5 Developing system	68
12.3.6 Toner cartridge (TC) life control	68
13. 1st transfer section	69
13.1 Composition	69
13.2 Drive	70
13.3 Operation	71
13.3.1 1st transfer output control	71
13.3.2 Transfer belt cleaning mechanism	71
13.3.3 Cleaning blade pressure/retraction mechanism	72
13.3.4 Belt Positioning Sensor	75
13.3.5 ATVC (Auto transfer voltage control)	76
13.3.6 Image stabilization control item	77
14. 2nd transfer section/ media separation	78
14.1 Composition	78
14.2 Drive	79
14.3 Operation	80
14.3.1 2nd transfer roller pressure/retraction control	80
14.3.2 2nd transfer roller cleaning	81
14.3.3 Neutralization and separation of media	82
15. Toner collecting section	83
15.1 Composition	83
15.2 Drive	83
15.3 Operation	84
15.3.1 Toner collecting mechanism	84
15.3.2 Waste toner near full detection system	85
16. Media feed section	86
16.1 Composition	86
16.2 Drive	87
16.3 Operation	88
16.3.1 Up/down control	88
16.3.2 Paper feed control	89
16.3.3 Double feed prevention mechanism	89
16.3.4 Remaining media detection control	89
16.3.5 Media feed retry function	90
17. Fusing section	91
17.1 Composition	91
17.2 Drive	92
17.3 Operation	93
17.3.1 Fusing temperature control	93
17.3.2 Wait control	94
17.3.3 Print control	94
17.3.4 Protection against abnormally high temperature	95
17.3.5 PPM control	95
18. Media exit section	96
18.1 Composition	96
18.2 Drive	97
18.3 Operation	97
18.3.1 Conveyance control	97
18.3.2 Media exit full detection control	97
19. Image stabilization control	98
19.1 Overview	98
19.2 Operation	99
19.2.1 Leak detection control	99
19.2.2 IDC sensor LED intensity control	99
19.2.3 Transfer belt surface correction control	99
19.2.4 Control of the maximum amount of toner sticking	99
19.2.5 Laser intensity adjustment control	99
19.2.6 g correction control	99
19.3 Operation timing	100
19.4 Operation flow	100
20. Fan control	101
20.1 Composition	101
20.2 Operation	101
20.2.1 Function	101
20.2.2 Control conditions	102
Auto document feeder unit	104
CONTENTS	106
OUTLINE	108
1. Product Specifications	108
COMPOSITION/OPERATION	110
2. Composition	110
3. Drive	111
4. Mechanical operations	112
4.1 Document feed mechanism	112
4.1.1 Document separation mechanism	113
4.2 Document transport/exit mechanism	114
4.2.1 Document transport mechanism	114
4.2.2 Document exit mechanism	115
Lower Feeder Unit	116
CONTENTS	118
OUTLINE	120
1. Product specifications	120
1.1 Type	120
1.2 Paper type	120
1.3 Machine specifications	120
1.4 Operating environment	120
Composition/Drive	122
2. Composition	122
3. Drive	123
4. Drive	124
4.1 Conveyance drive mechanism	124
4.2 Media Empty Detection	125
Duplex Option	126
CONTENTS	128
OUTLINE	130
1. Product specifications	130
COMPOSITION/OPERATION	132
2. Composition	132
2.1 Duplex option	132
2.2 Attachment	133
3. Drive	134
3.1 Duplex option	134
3.2 Attachment	134
4. Operations	135
4.1 Switchback mechanism	135
4.1.1 Switchback operation	135
4.1.2 Exit roller drive coupling mechanism	135
4.1.3 Switchback Motor Control	136
4.2 Transport and duplex media take-up mechanism	137
4.2.1 Transport and duplex media take-up operation	137
4.2.2 Duplex init transport motor control	137
4.2.3 Media path during take-up of media from the duplex option	137
4.2.4 Loop correction control	138
4.3 Fan control	138
4.3.1 Composition	138
4.3.2 Operation	138
4.3.3 Control condition	138
4.4 2-sided printing method	139
4.4.1 Operations in 2-sided printing with a single sheet of media resident in the system	139