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rd stage: Thermostat protection

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magicolor 4650EN magicolor 4650DN Composition/Operation 20. Fusing section Theory of operation Ver.1.0 Nov. 2007 D. Print control temperature adjustments • The temperature during print control is adjusted using the menu available from the control panel. The temperature can, however, be decreased only. • Adjustment steps are 0°C, -5°C, and -10°C. 20.3.6 PPM control • The PPM control is performed to prevent the fusing pressure roller and the fusing belt temperatures from going down during a multi-print cycle as well as to prevent the temperatures of the roller and belt edges from going up. • If a multi-print cycle is run using media of a small size, a difference is produced in temperature between the center portion of the roller/belt (the surface over which the media moves past) and the edges of the roller/belt (where no part of the media moves past). To inhibit this situation, the distance between sheets of media is widened and the temperature of the fusing roller is thereby made uniform. 20.3.7 Protection against abnormally high temperature • The main body provides protection at three different stages to prevent abnormally high temperature of the fusing unit. 1. Soft protection 2. Hard protection 3. Thermostat protection A. 1st stage: soft protection • If the thermistor 1 or the thermistor 2 detect a temperature exceeding a predetermined value, the malfunction code representing abnormally high temperature is displayed. At this time, the heater lamps are turned OFF forcibly and the initiation of any new print cycle is prohibited (abnormally high temperature detection control). B. 2nd stage: hard protection • The following hard protection control is provided if the CPU overruns and becomes unable to detect an abnormally high temperature. 1. The thermistor/1 or thermistor/2 detect a temperature exceeding a predetermined value. 2. The remote signal for the corresponding heater lamp of the DC power supply is forcibly turned OFF through the MFP board. 3. The triac circuit on the DC power supply is turned OFF to shut down the power supply to the corresponding heater lamp. 4. The heater lamp is forcibly turned OFF. 5. The temperature detected by the thermistor/1 or thermistor/2 is decreased to a level below the predetermined value. 6. The remote signal forcible OFF of the corresponding heater lamp is reset so that power supply to the heater lamp is resumed. C. 3rd stage: Thermostat protection • If neither the soft protection nor hard protection can detect an abnormally high temperature due to a defective thermistor, the thermostat operate at the specified temperature. This shuts down the power supply to the fusing heater lamp, thus forcibly turning them OFF. 82

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
5.1 Internal Laser Radiation	16
5.2 Laser Safety Label	19
5.3 Laser Caution Label	19
5.4 PRECAUTIONS FOR HANDLING THE LASER EQUIPMENT	20
WARNING INDICATIONS ON THE MACHINE	21
MEASURES TO TAKE IN CASE OF AN ACCIDENT	24
Composition of the service manual	26
Notation of the service manual	27
magicolor 4650EN/4650DN main body	28
CONTENTS	30
Outline	36
1. System configuration	36
2. Product specifications	37
3. Section configuration	40
4. Media path	41
5. Image creation process	42
Composition/Operation	44
6. Overall composition	44
6.1 Timing chart at main body power on	44
6.2 Control block diagram	45
7. Write section	46
7.1 Composition	46
7.2 Operation	47
7.2.1 Overview	47
7.2.2 Laser exposure process	47
7.2.3 Laser emission timing	48
7.2.4 Laser emission area	48
7.2.5 Laser light intensity control	49
7.2.6 Registration correction control	49
8. Toner supply section	50
8.1 Composition	50
8.2 Drive	51
8.3 Operation	52
8.3.1 Toner conveying mechanism	52
8.3.2 Toner collecting port shutter mechanism	53
8.3.3 Toner replenishing mechanism	54
8.3.4 Toner level detection	55
8.3.5 Toner near-empty condition detection	55
8.3.6 Toner empty condition detection	56
8.3.7 Toner empty condition detection control	56
8.3.8 Toner cartridge life control	56
9. Print unit section (overall composition)	57
9.1 Composition	57
9.2 Operation	58
9.2.1 Print unit life detection	58
9.2.2 Print unit life control	58
10. Print unit section (photo conductor)	59
10.1 Composition	59
10.2 Drive	59
10.3 Operation	60
10.3.1 Photo conductor drive mechanism	60
10.3.2 Photo conductor post-exposure control	61
10.3.3 Photo conductor total exposure control upon recovery	61
10.3.4 Photo conductor small amount rotation control	61
11. Print unit section (charge corona)	62
11.1 Composition	62
11.2 Operation	63
11.2.1 Charge corona unit ON/OFF control	63
11.2.2 Ozone ventilation mechanism	63
12. Print unit section (developing)	64
12.1 Composition	64
12.2 Operation	65
12.2.1 Developing drive control	65
12.2.2 Toner collecting port shutter mechanism	66
12.2.3 Toner flow	67
12.2.4 Developing system	68
12.2.5 Cleaning mechanism	69
12.2.6 Toner collecting port shutter mechanism	69
13. Transfer section (1st transfer)	70
13.1 Composition	70
13.2 Drive	71
13.3 Operation	72
13.3.1 1st transfer output control	72
13.3.2 1st transfer roller pressure/retraction control	72
13.3.3 1st transfer roller pressure operation	73
13.3.4 1st transfer roller retraction operation	74
13.3.5 1st transfer roller pressure/retraction position control	75
13.3.6 Transfer belt cleaning mechanism	76
13.3.7 1st transfer belt cleaning control	77
13.3.8 1st transfer belt backward rotation control	77
13.3.9 Toner collecting port shutter mechanism	78
14. Transfer section (2nd transfer)	79
14.1 Composition	79
14.2 Drive	80
14.3 Operation	80
14.3.1 2nd transfer roller pressure mechanism	80
14.3.2 2nd transfer voltage control	82
14.3.3 2nd transfer voltage setting control (ATVC: auto transfer voltage control)	82
14.3.4 2nd transfer roller cleaning control	83
15. Waste toner collecting section	84
15.1 Composition	84
15.2 Drive	85
15.3 Operation	86
15.3.1 Toner flow at the 1st transfer section	86
15.3.2 Toner flow at the 2nd transfer section	87
15.3.3 Toner collecting port shutter mechanism at the suction transport unit	88
15.3.4 Toner collecting port shutter mechanism of the waste toner bottle	88
15.3.5 Waste toner box locking mechanism	89
15.3.6 Waste toner box locked position detection mechanism	89
15.3.7 Waste toner box-in-position detection mechanism	90
15.3.8 Waste toner flow in the waste toner box	90
15.3.9 Waste toner near-full condition detection control	91
15.3.10 Waste toner full condition detection control	91
16. Media feed section (Tray 1)	92
16.1 Composition	92
16.2 Drive	93
16.3 Operation	93
16.3.1 Media lift plate mechanism	93
16.3.2 Media separation mechanism	94
16.3.3 Media feed control	94
16.3.4 Media empty condition detection control	95
17. Media feed section (Tray 2)	96
17.1 Composition	96
17.2 Drive	97
17.3 Operation	97
17.3.1 Media lift plate mechanism	97
17.3.2 Media separation mechanism	98
17.3.3 Media feed control	98
17.3.4 Media supply level detection control	99
17.3.5 Media empty condition detection control	99
17.3.6 Tray open/close detection control	100
17.3.7 Media misfeed detection control	100
18. Conveyance section (IDC sensor)	101
18.1 Composition	101
18.1.1 Drive	102
18.2 Operation	102
18.2.1 Toner density detection control	102
18.2.2 IDC sensor calibration control	103
18.2.3 IDC sensor shutter mechanism	103
19. Conveyance section (Registration roller)	104
19.1 Composition	104
19.2 Drive	105
19.3 Operation	106
19.3.1 Conveyance speed control	106
19.3.2 Registration roller control	106
19.3.3 Control of loop formed before registration roller	107
19.3.4 Media neutralization	107
19.3.5 OHP transparencies detection control	108
19.3.6 Media size error detection control	109
19.3.7 Temperature/humidity sensor	109
20. Fusing section	110
20.1 Composition	110
20.2 Drive	111
20.3 Operation	111
20.3.1 Fusing roller drive control	111
20.3.2 Fusing temperature control	115
20.3.3 Warm-up control	115
20.3.4 Wait control	116
20.3.5 Print control	116
20.3.6 PPM control	117
20.3.7 Protection against abnormally high temperature	117
21. Image stabilization control	118
21.1 Overview of image stabilization control	118
21.1.1 Complete correction control	118
21.1.2 Simplified correction control	119
21.1.3 Individual registration control	119
21.1.4 Image stabilization control execution request	120
22. Miscellaneous	121
22.1 Fan control	121
22.1.1 Composition	121
22.1.2 Function	121
22.1.3 Control	122
23. Switchback/Duplex section	124
23.1 Composition	124
23.2 Drive	125
23.3 Operation	126
23.3.1 Outline	126
23.3.2 Switchback guide movable mechanism	127
23.3.3 Paper exit switching mechanism	128
23.3.4 Transport /Paper re-feed mechanism	130
Lower feeder unit	132
CONTENTS	134
Outline	136
1. Product specifications	136
Composition/Operation	138
2. Overall composition	138
3. Drive	139
4. Operations	139
4.1 Media feed control	139
4.1.1 Media lift plate mechanism	139
4.1.2 Feed roller/vertical transport roller control	140
4.1.3 Media separation mechanism	141
4.1.4 Media detection mechanism	141
4.1.5 Media supply level detection control	142
4.1.6 Media empty condition detection control	142
4.1.7 Edge guide plate	143
4.1.8 Trailing edge guide plate	143
4.1.9 Media size detection control	144
4.1.10 Media reference position adjustment mechanism	145

Match case Limit results 1 per page

20. Fusing section

Theory of operation Ver.1.0 Nov. 2007

magicolor 4650EN

magicolor 4650DN

siti

n/Ope

Print control temperature adjustments

•

The temperature during print control is adjusted using the menu available from the con-

trol panel. The temperature can, however, be decreased only.

•

Adjustment steps are 0

C, -5

C, and -10

20.3.6

PPM control

•

The PPM control is performed to prevent the fusing pressure roller and the fusing belt

temperatures from going down during a multi-print cycle as well as to prevent the tem-

peratures of the roller and belt edges from going up.

•

If a multi-print cycle is run using media of a small size, a difference is produced in tem-

perature between the center portion of the roller/belt (the surface over which the media

moves past) and the edges of the roller/belt (where no part of the media moves past).

To inhibit this situation, the distance between sheets of media is widened and the tem-

perature of the fusing roller is thereby made uniform.

20.3.7

Protection against abnormally high temperature

•

The main body provides protection at three different stages to prevent abnormally high

temperature of the fusing unit.

Soft protection

Hard protection

Thermostat protection

1st stage: soft protection

•

If the thermistor 1 or the thermistor 2 detect a temperature exceeding a predetermined

value, the malfunction code representing abnormally high temperature is displayed. At

this time, the heater lamps are turned OFF forcibly and the initiation of any new print

cycle is prohibited (abnormally high temperature detection control).

2nd stage: hard protection

•

The following hard protection control is provided if the CPU overruns and becomes

unable to detect an abnormally high temperature.

The thermistor/1 or thermistor/2 detect a temperature exceeding a predetermined

value.

The remote signal for the corresponding heater lamp of the DC power supply is

forcibly turned OFF through the MFP board.

The triac circuit on the DC power supply is turned OFF to shut down the power sup-

ply to the corresponding heater lamp.

The heater lamp is forcibly turned OFF.

The temperature detected by the thermistor/1 or thermistor/2 is decreased to a

level below the predetermined value.

The remote signal forcible OFF of the corresponding heater lamp is reset so that

power supply to the heater lamp is resumed.

3rd stage: Thermostat protection

•

If neither the soft protection nor hard protection can detect an abnormally high tempera-

ture due to a defective thermistor, the thermostat operate at the specified temperature.

This shuts down the power supply to the fusing heater lamp, thus forcibly turning them

OFF.