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Brother MFC-7420R [324/327] A ncu pcb mfc7820
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Содержание
- Allfb service manual 1
- Facsimile equipment 1
- Models mfc7420 7820n dcp7010 7020 7025 1
- Service manual 1
- How this manual is organized 3
- Preface 3
- Table of contents 5
- Safety precautions 11
- To use the mfc safely 11
- Warning 11
- Caution 12
- Warning 12
- Choosing a location 13
- Chapter 1 parts names functions 15
- Contents 15
- This chapter contains external views and names of components and describes their functions information about the keys on the control panel is included to help you check operation or make adjustments 15
- 1 confidential 16
- Equipment outline 16
- Front view 16
- Rear view rear view 16
- 2 confidential 17
- 5 4 3 2 1 17
- Control panel 17
- Mfc 7420 and mfc 7820n have similar control keys 17
- 4 confidential 19
- Components 19
- The equipment consists of the following major components 19
- Chapter 2 specifications 21
- Contents 21
- This chapter lists the specifications of each model which enables you to make a comparison of different models 21
- General 22
- 4 confidential 25
- Note logical page shows the printable area for a pcl driver printable area shows mechanical printable area of the machine therefore the machine can only print within the shaded area when you use a pcl driver 25
- Portrait 25
- Printable area 25
- When using pcl emulation the edges of the paper that cannot be printed on are shown below 25
- 5 confidential 26
- Note the paper sizes indicated here should confirm to the nominal dimensions specified by jis except b5 iso b6 iso the dot size is based on 300 dpi resolution 26
- The table below shows the printable areas when printing on portrait for each paper size 26
- 6 confidential 27
- Landscape 27
- Note logical page shows the printable area for a pcl driver printable area shows mechanical printable area of the machine therefore the machine can only print within the shaded area when you use a pcl driver 27
- 7 confidential 28
- Note the paper sizes indicated here should confirm to the nominal dimensions specified by jis except b5 iso b6 iso the dot size is based on 300 dpi resolution 28
- The table below shows the printable areas when printing on landscape for each paper size 28
- 8 confidential 29
- Mfc7420 7820n 29
- Specifications list 29
- 9 confidential 30
- 10 confidential 31
- 11 confidential 32
- 12 confidential 33
- 13 confidential 34
- 14 confidential 35
- 15 confidential 36
- 16 confidential 37
- Dcp7010 7020 7025 37
- 17 confidential 38
- 18 confidential 39
- 19 confidential 40
- 20 confidential 41
- 21 confidential 42
- 22 confidential 43
- Chapter 3 theory of operation 45
- Contents 45
- This chapter gives an overview of the scanning and printing mechanisms as well as the sensors actuators and control electronics it aids in understanding the basic principles of operation as well as locating defects for troubleshooting 45
- Confidential 3 1 46
- Control section 46
- Overview 46
- Confidential 3 2 47
- Mechanical components 47
- Confidential 3 3 48
- Scanner mechanism 48
- This mechanism consists of the document cover the scanner unit scanner cover and the automatic document feeder adf the scanner unit consists of a scanner top cover cis unit cis drive assembly and scanner base the detailed illustration on the next page shows the components making up the adf document pull in roller document separation roller document feed roller adf motor and document front and rear sensors for further details on the sensors see section 3 48
- This scanner mechanism supports a dual scanning system adf scanning and flat bed scanning they automatically switch to the former at the start of a scan operation if the document front sensor inside the adf detects a document 49
- Confidential 3 6 51
- Paper supply 51
- Printing mechanism 51
- The feed roller picks up a few sheets or one sheet of paper from the paper tray every time it is rotated and feeds it to the separation roller 51
- 1 the paper is gripped between the separation roller and separation pad and separated into individual sheets the separation roller is connected to the gear 52 p r 52
- 2 the section of the gear 52 p r where there is no cog is normally fixed at the position as shown in the figure below by the p r solenoid assy 52
- 3 therefore the main motor drive is not transmitted to the gear 52 p r 52
- 4 when the paper is fed the p r solenoid assy is activated first 52
- 5 then the gear 52 p r is pulled by the spring extension p r so that the gears are engaged 52
- 6 the main motor drive is transmitted to the gear 52 p r and the separation roller is turned 52
- Confidential 3 7 52
- The paper drawn out of the paper tray pushes against the regist front actuator and the paper top position or absence of paper is detected by the actuator movement the tail edge actuator detects the end of the paper fed 52
- After the paper top position is detected by the regist front actuator the paper separated into individual sheets by the separation roller is fed further for a specified time and the paper top position reaches the paper feed roller so that the paper skew is adjusted then the f r solenoid is turned off the paper feed roller starts turning and the paper is fed to the transfer roller in the drum toner assy 55
- Confidential 3 1 0 55
- Paper registration 55
- The regist rear actuator in the path from the feed roller to the transfer roller controls the first print position on the paper the printer starts transferring an image when a definite time passes after the paper is passed through the regist rear actuator 55
- 2 grid spreads the ion charge evenly over the drum surface 56
- After the paper exits from the heat roller the paper is turned by the rear cover and ejected face down into the top output tray through the eject roller assy 56
- After the printing image on the exposure drum is transferred onto the paper the paper is fed to the fixing unit to fix unfixed toner onto the paper 56
- Afterwards the paper is ejected from the fixing unit by the heat roller and the pressure roller in the fixing unit the paper eject actuator detects whether the paper is ejected correctly or not 56
- Forms a uniform charge on the drum surface 1 corona wire generates the ion charge on the drum 56
- Generates the latent electrostatic image and develops the image on the drum surface 56
- Removes the paper dust or dirt on the surface of the exposure drum 56
- Transfers the toner image to the paper from the drum surface 56
- 2 3 4 5 6 7 8 9 10 11 12 57
- Confidential 3 1 2 57
- Develops the electrostatic latent image on the exposure drum with toner and forms the visible image 57
- Page job 57
- Printable pages 57
- The life of the toner cartridge is starter 1 500 standard 2 500 pages at the 5 coverage in the case of low duty printing toner life end is indicated by displaying the toner life end message on the lcd before toner runs out because the developer roller surface or other toner sealing is worn out due to rotation of the rollers the upper limit of the drum rotation is 45 000 3000 sheets x 15 rotations the following graph shows the number of printable pages in the case of a4 printing 57
- Toner cartridge 57
- Toner life end mode 57
- Confidential 3 1 4 59
- The counter resetting method during indication of toner life end depends on the cause of toner life end and the condition of the inserted toner cartridge refer to the following table for details 59
- To always obtain a print result of a constant density the printer counts the number of print pages immediately after the toner cartridge is replaced and changes the bias voltage according to the accumulated number of prints with the toner cartridge the bias voltage is changed with the steps described below 1 when the new toner sensor detects that the toner cartridge is replaced with a new full one the developing bias is set to 450v initialized 2 after that the bias voltage is stepped down according to the number of prints 59
- When the new toner detection switch detects that the toner cartridge is replaced with a new one the developing bias voltage is initialized at the same time the toner used for the printer has a property that print density is light first and gradually darker in the course of usage the developing bias controls the toner property so that the print density is constant from first to last 59
- 1 the laser beam radiated from a laser diode inside the laser unit are concentrated into a constant width by a slit in the co lens cell and then reflected by a polygon mirror rotating at high speed 2 the laser beam reflected by the polygon mirror are refracted by the theta lens and radiated from the right through to the left end of the reflection mirror as the polygon mirror rotates at this time blur of the vertical direction of the laser beam by inclination of a polygon mirror is corrected by passing a cyl lens 60
- After the drum is positively charged it is exposed to the light emitted from the laser unit 60
- The drum is charged to approximately 900v by an ion charge which is generated by the primary charger the charge is generated by ionization of the corona wire which has a dc bias from the high voltage power supply applied to it the flow of the ion charge is controlled by the grid to ensure it is distributed evenly on the drum surface the aluminum drum sleeve in the exposure drum is grounded 60
- The primary charge uses a corona wire but since the drum is positively charged only less than 1 10 of the usual quantity of ozone is generated compared with the negatively charged drum the level of ozone expelled from the printer is therefore not harmful to the human body applicable safety standards have been complied with 60
- Developing 61
- Developing causes the toner to be attracted to the electrostatic image on the drum so as to transform it into a visible image the developer consists of a non magnetic toner the developer roller is made of conductive rubber and the supply roller which is also made of conductive sponge rotate against each other the toner is charged and carried from the supply roller to the developer roller the toner adheres to the developer roller and is conveyed to the exposure drum at an even thickness controlled by the blade the toner is nipped between the developer roller and the drum and developed onto the latent image on the drum the electrostatic field between the drum and the developer roller which is dc biased from the high voltage power supply creates the electrostatic potential to attract toner particles from the developer roller to the latent image area on the drum surface 61
- The laser beams reflected by the reflection mirror go straight toward the exposure drum below it then expose the exposure drum the area exposed to the laser beam is the image to be printed the surface potential of the exposed area is reduced forming the electrostatic image to be printed 61
- Chapter 4 transfer of data left in the machine to be sent for repair 66
- Contents 66
- This chapter describes how to transfer data left in the machine to be sent for repair the service personnel should instruct end users to follow the transfer procedure given in this chapter if the machine at the user site cannot print received data due to the printing mechanism defective end users can transfer received data to another machine to prevent data loss 66
- Transferring received fax data 67
- Cover page sample 68
- End page sample end page sample 68
- At the start of a disassembly job you check the disassembly order flow that guides you through a shortcut to the object components 70
- Chapter 5 disassembly reassembly and lubrication 70
- Contents 70
- This chapter also covers screw tightening torques and lubrication points to which the specified lubricants should be applied during reassembly jobs 70
- This chapter details procedures for disassembling and reassembling the machine together with related notes the disassembly order flow provided enables you to see at a glance the quickest way to get to component s involved 70
- Disassembly reassembly 72
- 0 5 1 main frame l taptite bind b m4x12 73
- 0 8 1 main frame r taptite bind b m4x12 73
- Confidential 5 4 75
- Disassembly flowchart 75
- 1 disconnect ac cord from the machine 76
- 1 open the front cover and remove the drum toner assy 76
- 1 close the front cover and pull out the paper tray 77
- 2 remove the paper from the paper tray 77
- 3 remove the separation pad holder assy and the separation pad spring 77
- 1 remove the rear cover 78
- Note remove the a section of the rear cover while opening the rear cover slightly 78
- 1 remove the rear chute cover 79
- 2 remove the paper eject actuator and the eject actuator spring 79
- 1 open the front cover 80
- 2 remove the two bind b m4x12 taptite screws and then remove the side cover l 80
- Confidential 5 9 80
- Side cover l 80
- 1 remove the two bind b m4x12 taptite screws and then remove the side cover r 81
- 1 open the adf unit and scanner unit 82
- 2 remove the one cup s m3x6 taptite screw and adf fg harness and fb fg harness 82
- 3 disconnect the two connectors of the adf unit from the main pcb 82
- 4 disconnect the two connectors of the scanner unit from the main pcb 82
- 5 close the adf unit and scanner unit 83
- 6 remove the two pins and remove the adf cover 83
- 7 release the two hooks from the adf cover and remove the pressure roller assy 7 release the two hooks from the adf cover and remove the pressure roller assy 83
- 8 remove the two lf springs from the adf cover 83
- Confidential 5 12 83
- 12 close the adf unit 85
- 13 remove the separate roller shaft assy and bushing from the adf unit 85
- 14 remove the four cup b m3x10 taptite screws 85
- 15 release the three hooks a to remove the upper document chute 85
- 16 remove the separation rubber assy from the upper document chute 86
- 17 remove the separation rubber from the adf plate spring 86
- 18 remove the two cup b m3x10 taptite screws from the lower document chute 87
- 19 release the two hooks to remove the lower document chute 87
- 20 release the hook on the adf unit and remove the ejection roller assy 87
- Note when re connecting the connectors put them through the holes on the adf unit before connectin 87
- 21 remove the two ejection rollers from the pressure roller shaft 88
- 22 remove the adf unit ejection spring from the adf unit 22 remove the adf unit ejection spring from the adf unit 88
- 23 release the two hooks and remove the resin bearing 89
- 24 remove the lf roller assy from the lower document chute 89
- 25 release the two hooks a and remove the the ejection roller assy from the lower 25 release the two hooks a and remove the the ejection roller assy from the lower document chute 89
- 26 release the two hooks b and remove the ejection roller bearing from the ejection roller assy 89
- Confidential 5 18 89
- 27 remove the two cup b m3x10 taptite screws and one cup s m3x6 taptite screw from the lower document chute 90
- 28 remove the drive frame assy from the lower document chute 90
- 29 remove the one bind s m3x6 taptite screw from the drive frame assy to remove the adf motor 90
- 30 remove the adf motor harness from the adf motor 90
- 31 remove the document rear actuator from the lower document chute 91
- Note when re assembling drive frame assy assemble it so that the arm assy is at the top 91
- 32 remove the document front actuator from the lower document chute 92
- 33 release the two hooks a on the lower document chute to remove the adf sensor pcb assy 92
- 34 remove the adf sensor harness assy 92
- 35 turn the lower document chute upside down 93
- 36 remove the pins and remove the document hold 93
- 37 remove the document spring from the lower document chute 93
- 38 open the adf unit 93
- 39 remove the one bind b m4x12 taptite screw from the document cover sub assy 93
- 40 release the hook to remove the document cover assy 93
- 41 remove the two springs 94
- 42 remove the pressure roller assy 94
- 43 remove the two pressure rollers from the pressure roller shaft 94
- 44 remove the three cup b m3x10 taptite screws to remove the hinge assy l 95
- 45 remove the hinge from the hinge arm 95
- 46 remove the one bind b m4x12 taptite screw to remove the hinge arm 95
- 1 open the scanner unit 96
- 2 release the hook to remove the scanner unit side of the pull arms r l 96
- 3 remove the pull arm springs and remove the pull arms r l from the pull arm guides 96
- Confidential 5 25 96
- Pull arm pull arm guide lock claw pull arm spring 96
- 1 disconnect the flat cable from the main pcb 97
- 1 remove the four cup b m3x10 taptite screws from the scanner unit 97
- 2 release the four hooks 97
- 2 remove the scanner unit from the machine 97
- Confidential 5 26 97
- Scanner unit 97
- 3 disconnect the connector from the panel pcb assy 98
- 4 release the three hooks to remove the panel unit from the scanner unit 98
- 5 remove the lcd harness from the panel pcb 98
- 6 release the three hooks a to remove the panel pcb from the panel cover 98
- 7 remove the rubber key 99
- 8 release the two hooks a to remove the backlight guide 99
- Confidential 5 28 99
- Note when re assembling the rubber key make sure that the key works correctly 99
- 10 release the two hooks a to remove the lcd 100
- 9 remove the diffusion film 100
- Confidential 5 29 100
- 1 remove the two bind b m4x12 taptite screws and one pan s p washer m3 x6 screw from the ncu unit 101
- 2 remove the one pan s p washer m3 x6 screw from the ncu shield cover to remove the ncu shield plate 101
- 1 disconnect the connector of the speaker from the main pcb 102
- 3 remove the ncu harness assy 102
- 4 remove the two cup s m3x6 taptite screws from the ncu shield cover to remove the ncu pcb assy 102
- 2 release the three hooks to remove the speaker cover 103
- 3 release the one hook to remove the speaker hold spring 103
- Confidential 5 32 103
- 1 remove the bind b m4x12 taptite screw and then remove the rear cover stopper 104
- 4 remove the speaker assy 104
- Confidential 5 33 104
- 2 remove the two bind b m4x12 taptite screws and the rear chute cover spring 105
- 3 remove the inner chute 105
- Confidential 5 34 105
- Note re assemble the inner chute while pushing onto the pinch roller of the inner chute with the eject roller of the joint cover assy 105
- 4 remove the battery assy and disconnect the connector 106
- Caution there is a danger of explosion if the battery is incorrectly replaced do not replace the battery do not disassemble recharge or dispose of in fire used battery should be disposed of according to local regulations 5 remove the four bind b m4x12 taptite screws and then remove the joint cover assy 106
- Confidential 5 35 106
- 1 release the hook of the drive release cam from the front cover assy 107
- 2 release the hook a on the front cover assy from the chute 107
- 3 slide the front cover assy to the direction of the arrow shown in the figure below to remove it 107
- Confidential 5 36 107
- Front cover 5 5 front cover 107
- 4 remove the paper stopper l 108
- 5 remove the paper stopper s from the paper stopper l 108
- 1 turn the printer upside down 109
- 2 remove the six bind b m4x12 taptite screws and then remove the chute base 109
- Note note when re assembling the chute base check that the bind b m4x12 taptite screws a and b shown in the figure above are secured correctly 109
- Take the drum toner unit out from the printer check that the distance between the floor and the separation roller collar of the pickup roller holder assy is 45 to 47 mm by using the plate jig if not re assemble the chute base 110
- 3 remove the spring extension p r from the gear 52 p r 111
- 4 release the hook and remove the gear 52 p r 111
- 5 remove the bush f r 111
- 6 remove the f r roller shaft assy 111
- Confidential 5 40 111
- 7 remove the link lever from the hook of the pickup roller holder assy 112
- 8 remove the pickup roller holder assy 112
- Note the pickup roller holder spring is assembled on the bottom of the pickup roller holder assy be careful not to lose the spring 112
- 1 disconnect the heater harness connector and thermistor harness connector 113
- 2 remove the two cup b m4x12 taptite screws and then remove fixing unit 113
- 4 remove the pressure roller assy pressure roller pr arm assy pr bush from the fuser frame 113
- Note be sure not to touch the pressure roller 3 remove the two pr spring 113
- 5 remove the two pr arm assy and two pr bush from the pressure roller 114
- 6 release each hook of the springs from the fuser frame and remove the four separate claw assys 114
- Note be careful not to damage the heat roller when removing the separate claw assy 114
- 7 remove the two pan s p washer m3x8 screws 115
- 8 remove the heat roller 115
- 9 remove the halogen heater 115
- Note when re assembling the halogen heater put the halogen heater onto the fuser frame so that the terminal of the heater harness is at the top and secure the screws in the order shown in the figure below 116
- Note when re assembling the heat roller assemble the hr bush onto the fuser frame referring to the figure below 116
- 10 remove the hr gear 117
- 11 remove the two hr bush 117
- 12 remove the thermistor assy harness from the four hooks 117
- 13 remove the cup b m3x12 taptite screw and then remove the thermistor assy 117
- Note when re assembling the thermistor assy to the fuser frame ensure the direction of the thermistor assy is correct referring to the figure below 118
- 1 disconnect the three connectors from the high voltage ps pcb assy 119
- 2 disconnect the high voltage ps pcb harness from the main pcb 119
- 3 remove the two bind b m4x12 taptite screws and the two cup s m3x6 taptite screws 119
- 4 remove the high voltage ps pcb from main frame l 119
- Confidential 5 48 119
- High voltage ps pcb assy 119
- 1 disconnect the thirteen connectors from the main pcb 120
- 2 remove the five cup s m3x6 taptite screws and fg harness assy 6 120
- 3 remove the two flat s m3x8 taptite screws 120
- 4 remove the main pcb from main frame l 120
- Note when replacing the main pcb refer to adjustments and updating of settings required after parts replacement in chapter 6 120
- 1 disconnect the thirteen connectors from the main pcb 121
- 2 remove the five cup s m3x6 taptite screws and fg harness assy 6 121
- 3 remove the two flat s m3x8 taptite screws 121
- 4 remove the main pcb from main frame l 121
- Note when replacing the main pcb refer to adjustments and updating of settings required after parts replacement in chapter 6 121
- 1 remove the duct film 122
- 2 remove the pan s p washer m3 x 6 screw and fg harness assy 1 122
- 3 remove the pan s p washer m3 x 6 screws and fg harness assy 5 122
- 4 remove the pan s p washer m3 x 6 screws and ncu fg harness 122
- 5 remove the two cup s m3x6 taptite screws 122
- 6 remove the lv shield plate cover from the main frame r 122
- 7 remove the lv insulation sheet 122
- Confidential 5 51 122
- Ps pcb unit 122
- 10 remove the two flat s m3x8 taptite screws and then remove the inlet harness assy 123
- 8 remove the pan s p washer m3 x6 screw and then remove the ground wire 123
- 9 remove the bind b m4x12 taptite screw and then remove the lv shield plate 123
- 11 remove the two cup s m3x6 taptite screws 124
- 12 disconnect the three connectors from the ps pcb unit and then remove the ps pcb unit 124
- Note when disconnecting the connectors disconnect the regist sensor pcb connector and toner led pcb unit assy connector first lift up the ps pcb unit from the lv shield plate and disconnect the main pcb connector 124
- 1 remove the cup s m3x6 taptite screw a and fg harness assy 6 125
- 2 remove the four cup s m3x6 taptite screws b 125
- 3 remove the laser unit 125
- Confidential 5 54 125
- Laser unit 125
- 4 remove the filter assy from the air duct 126
- 5 remove the two cup s m3x6 taptite screws and then remove the air duct 126
- Another barcode label supplied with a new unit is spare make sure to throw it out 126
- Note when replacing the laser unit replace the barcode label attached on the gear plate calking assy with a new one supplied with a new unit 126
- 1 remove the two bind b m4x12 taptite screws and then remove the sub chute assy 127
- 1 turn the printer body upside down 128
- 2 pull the a section outwards and remove the link lever 128
- Note when re assembling the link lever insert the end of the link lever into the main frame l referring to the figure below 128
- 1 remove the regist front actuator with the regist front spring 129
- 1 remove the tail edge actuator with the tail edge spring 129
- 2 remove the regist front spring from the regist front actuator 129
- 2 remove the tail edge spring from the tail edge actuator 129
- 1 remove the bind b m3x6 taptite screw 130
- 1 remove the regist rear spring 130
- 2 release the harness from the hook and remove the regist sensor pcb assy 130
- 2 remove the regist rear actuator 130
- Confidential 5 59 130
- Regist sensor pcb assy 130
- 1 remove the three bind b m4x12 taptite screws and three fg harness assy 1 4 5 131
- 2 remove the base plate 131
- 3 release the harness from the hook and then remove the fan motor 60 unit from the main frame r 131
- 1 remove the toner led pcb assy from the main frame r 132
- 2 remove the led holder from the toner led pcb assy 132
- 1 release the two hooks and remove the new toner sensor from the main frame l 133
- 1 remove the new toner actuator spring 133
- 2 release the hook and remove the new toner actuator from the main frame l 133
- New toner sensor 133
- 1 release the two hooks and remove the cover sensor from the main frame l 134
- 1 remove the cup b m3x6 taptite screw and then remove the toner sensor pcb assy 134
- 1 remove the hvps insulation sheet 135
- 2 remove the five bind b m4x12 taptite screws and then remove the gear plate calking assy 135
- 3 remove the three cup s m3x6 taptite screws and then remove the main motor assy 135
- Confidential 5 64 135
- Main motor assy 135
- 1 remove the bind b m3x10 taptite screw 136
- 1 remove the develop joint from the gear plate calking assy 136
- 2 remove the p r solenoid assy the p r solenoid lever and the solenoid release spring p r 136
- 1 remove the gear assy from the main frame l 137
- Confidential 5 66 137
- F r solenoid assy 137
- Note the gear assy contains the small gears be careful not to lose them by disassembling the gear assy 137
- 2 remove the bind b m3x10 taptite screw 138
- 3 remove the f r solenoid assy the f r solenoid lever and the solenoid release spring f r 138
- Confidential 5 67 138
- 1 remove the two bind b m4x12 taptite screws and then remove the main frame l 139
- 1 remove the three bind b m4x12 taptite screws and then remove the main frame r 140
- Confidential 5 69 140
- Main frame r 140
- Confidential 5 70 141
- Fg harness assy 1 fg harness assy 5 141
- Harness routing 141
- Laser unit 141
- Confidential 5 71 142
- Fg harness assy 6 142
- Regist sensor pcb assy 142
- Confidential 5 72 143
- Fan motor 60 unit 143
- Toner led pcb assy 143
- Confidential 5 73 144
- P r solenoid assy f r solenoid assy 144
- Toner sensor pcb assy 144
- Confidential 5 74 145
- New toner sensor cover sensor battery harness 145
- Panel unit 145
- Adf unit 146
- Confidential 5 75 146
- Document scanner 146
- Confidential 5 76 147
- Ncu fg harness 147
- Ncu pcb 147
- Confidential 5 77 148
- Speaker assy 148
- Bg4 kanto kasei bg mu 4 mm dia ball 149
- Lubrication 149
- Pg2 pg 661 2 mm dia ball 149
- Chapter 6 adjustments and updating of settings required after parts replacement 151
- Contents 151
- This chapter details adjustments and updating of settings which are required if main pcb and some other parts have been replaced 151
- If you replace the main pcb 152
- If you replace the document scanner unit 153
- If you replace the laser scanner unit assy 153
- Chapter 7 cleaning 155
- For the cleaning procedures of the drum unit and toner cartridge refer to the user s guide 155
- Chapter 8 maintenance mode 157
- Contents 157
- This chapter describes the maintenance mode which is exclusively designed for the purpose of checks settings and adjustments using the keys on the control panel you can customize the eeprom according to the shipment destination of the machine concerned in addition you can perform operational checks of the lcd control panel pcb or sensors perform a print test display the log information or error codes and modify firmware switches wsw 157
- Entry into the maintenance mode 158
- List of maintenance mode functions 159
- User access to the maintenance mode 160
- Detailed description of maintenance mode functions 162
- 7 confidential 164
- Scanning compensation data list 164
- Cover page sample 178
- End page sample end page sample 178
- 23 confidential 180
- Chapter 9 error indication and troubleshooting 188
- Contents 188
- This chapter details error messages and codes that the incorporated self diagnostic functions display if any error or malfunction occurs if any error message appears refer to this chapter to find which components should be checked or replaced the latter half of this chapter provides sample problems that could occur in the main sections of the machine and related troubleshooting procedures this will help service personnel pinpoint and repair defective components 188
- Error indication 189
- Troubleshooting 203
- 1 light 1 2 dark 1 3 completely blank 1 4 all black 1 5 dirt on the back of paper 215
- 10 white horizontal streaks 1 11 faulty registration 1 12 poor fixing 1 13 image distortion 1 14 faint print 215
- 15 white spots 1 16 black spots 1 17 black band 1 18 gray background 1 19 hollow print 215
- 20 downward fogging of solid black 1 21 horizontal lines 1 22 light rain 1 23 ghost 1 24 toner specks 215
- 6 black vertical streaks 1 6 black vertical streaks 1 7 black horizontal stripes 1 8 black vertical streaks 1 9 white vertical streaks 215
- Confidential 9 27 215
- Image defects 215
- I 2 dark 217
- I 3 completely blank 218
- Interlock lever 218
- Laser scanner unit assy 218
- I 5 dirt on the back of paper 220
- I 6 black and blurred vertical streaks 221
- I 7 black and blurred horizontal stripes 222
- Are the developing bias contacts between the printer body and toner cartridge dirty 223
- Developing bias contact failure 223
- I 9 white vertical streaks 223
- Possible cause 223
- Remedy 223
- User check 1 check the paper used meets the recommended paper specifications a rough surfaced paper damp paper or thick media can cause the problem 2 check that the appropriate media type is selected in the printer driver 3 the problem may disappear by itself try printing multiple pages to clear this problem especially if the printer has not been used for a long time 4 the drum unit may be damaged install a new drum unit 223
- Yes clean the electrodes at both sides 4 223
- I 11 faulty registration 224
- I 12 poor fixing 225
- I 13 image distortion 226
- I 14 faint print 226
- Is the laser diode or the scanner motor defective no replace the laser unit 226
- Is the scanner harness connected properly check if it is coming loose 226
- Laser unit failure 4 is the problem solved by replacing the laser unit yes replace the laser unit 226
- Laser unit installation 1 is the laser unit secured to the frame incorrectly check if there is any play 226
- No connect the harness correctly 226
- No secure the unit correctly and tighten the screws 226
- Possible cause 226
- Printer installation 1 is the printer placed horizontally no place the printer on a flat surface 226
- Remedy 226
- Scanner connection failure 226
- Scanner ld emission failure scanner motor rotation failure 226
- Scanner window dirty 3 is the scanner window dirty yes clean the scanner window with a soft dry cloth 226
- Toner cartridge 2 does the problem happen immediately after replacing the toner cartridge with a new one 226
- Yes remove and carefully shake the toner cartridge horizontally 226
- I 15 white spots 227
- 1 remove the toner cartridge from the drum unit place the printing samples in front of the drum unit and find the exact position of the image defect 228
- Note clean the drum unit as follows 228
- I 16 black spots 229
- I 17 black band 230
- I 18 gray background 231
- I 19 hollow print 232
- I 23 ghost 234
- Confidential 9 47 235
- Drum unit 235
- Location of grounding contacts 235
- Printer body paper tray 235
- 1 serial number label for the machine itself 249
- Individual machines have a serial number label for the machine itself and a property label for the head carriage unit this section lists the coding information for those serial numbers and property codes 249
- Location location 249
- Serial numbering system 249
- 2 laser unit serial label 250
- App 1 2 confidential 250
- Location location 250
- Regarding x delay and y delay it indicates required delay amount for writing in each of main x and sub y scanning direction 250
- A2 installing the update data to the machine 252
- If you use parallel interface 252
- If you use usb cable 254
- A2 setting id codes to machines 260
- Eeprom customizing codes 262
- Appendix 4 firmware switches wsw 263
- Mfc7420 7820n dcp7010 7020 7025 263
- 2 not used 307
- 8 masking of symbol rate s 307
- Note wsw40 takes effect only when the v 4 mode is permitted wsw19 selector 7 in models supporting v 4 mode 307
- Selector no function setting and specifications 307
- These selectors allow you to limit the transmission speed range in v 4 mode by masking the desired symbol rate s transmission speeds assigned to the symbol rates are listed on the next page the setting made by these selectors will limit the setting made by selectors 1 through 4 on wsw39 if selector 3 is set to 1 to mask the 3429 symbols second when the first transmission speed choice is 33600 bps specified by selectors 1 through 4 of wsw39 for example then the allowable maximum transmission speed will be limited to 31200 bps if selector 8 is set to 1 to mask the 2400 symbols second when the first transmission speed choice is 33600 bps then the allowable maximum transmission speed remains 33600 bps if selector 8 is set to 1 to mask the 2400 symbols second when the first transmission speed choice is 21600 bps specified by selectors 1 through 4 on wsw39 then the allowable maximum transmission speed remains 21600 bps but the minimum transmission speed will be limited to 4800 bps 307
- Confidential 319
- Appendix 6 circuit diagrams 320
- Mfc7420 7820n dcp7010 7020 7025 320
- A ncu pcb mfc742 321
- Confidential 321
- A ncu pcb mfc7820 324
- Confidential 324
- B power supply pcb 100 325
- Confidential 325
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