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2.12 Fusing

2.12.1 Main construction

Structural diagram

Construction

Pressure spring system.

An oil supply pad and metering blade are used.

Blade system.

Oil pump system.

Drive from the main motor.

Pick-up pawl

Fusing exit roller

Grip

Fusing exit guide plate

Pressure roller

Fusing entrance

guide plate

Right oil

skimmer

Thermistor (20

C: 37 K

Ω

)

Thermofuse (192

Left oil skimmer

Metering blade

Hot roller

Upper oil pan

Heater

Oil blade

Oil supply pad

Heat insulating cover

Oil sump

Fusing unit

Fusing pressure mechanism

Oil supply mechanism

Cleaning mechanism

Oil pump mechanism

Fusing drive mechanism

1 July 1994

Fusing

2-89

Summary of Contents for PCU10

Page 1: ...RICOH FT9101 SERVICE TRAINING MANUAL LARGE CAPACITY TRAY RT32 FINISHER SR500 PRINTER CONNECTOR UNIT PCU10 KEY COUNTER PRINTER CONNECTOR BRACKET KP10 RICOH COMPANY LTD...

Page 2: ...special notations and be sure you understand what they mean NOTE Information under this heading describes helpful hints restric tions and how to avoid difficulties CAUTION FailuretopayattentiontoCAUT...

Page 3: ...SECTION 1 OVERALL MACHINE INFORMATION...

Page 4: ...e LT DLT version A4 A3 version Enlargement 129 141 121 122 115 115 Full Size 100 100 Reduction 93 93 77 82 74 71 65 65 Desired reproduction ratio s can be selected from 3 enlargements and 4 reductions...

Page 5: ...ecal Original Set Face down Original Feed Speed Same as copier in single side copying Power Source 100 V 50 60Hz from copier Maximum Power 120 W Consumption Weight 25 5 kg 1 1 2 Large capacity tray Co...

Page 6: ...sheets 50 sets 25 sets 25 sets 41 50 sheets 40 sets 20 sets Up to 100 stapled copy sets can be stacked because the stapled copy set makes an uneven stack on the tray Stapling Capacity 11 x 17 A3 20 lb...

Page 7: ...Full system 71 dB 1 3 Power Consumption Mean Power Consumption Copier Copier LCT Copier LCT Finisher During copying 3 43 kW 3 44 kW 3 65 kW During warm up 2 61 kW 2 62 kW 2 55 kW During standby Fusin...

Page 8: ...1 4 Machine Dimensions 1 4 1 Copier 1 4 2 LCT 150 680 1 430 1 685 830 1 110 775 550 400 675 975 1 July 1994 Machine Dimensions 1 5...

Page 9: ...1 4 3 Finisher 1 4 4 Full system 750 975 701 2 610 470 400 1 240 5 5 Machine Dimensions 1 July 1994 1 6...

Page 10: ...d separation unit A high voltage negative corona transfers positively charged toner to paper A high voltage ac corona breaks the attraction between the paper and OPC Cleaning unit Magnetic brush syste...

Page 11: ...ing in the duplex copy mode paper is stacked in the duplex tray Second side copying For second side copying in the duplex copy mode the shift tray ON mode is automatically selected This is because the...

Page 12: ...the differences in original and copy paper motions when simplex or duplex copies are made from the simplex or duplex originals in the sort and stack modes ADF mode stack mode Simplex original to simp...

Page 13: ...ls recirculate in the RDH accordingly Copies are always collated into sets The original motion in the RDH is just like the simplex original to simplex copy or duplex copy mode with the stack mode Howe...

Page 14: ...the reverse side of the copy then the copy is delivered See the lower illustration The copier repeats feeding the paper from the normal paper tray and from the duplex tray alternately This is called...

Page 15: ...the images of 4 originals are produced for one rotation of the OPC belt must be used In the A4 size copy mode three originals are fed into the RDH from the stack original feed tray before the first o...

Page 16: ...copied the original returns to the original table The original motion in the RDH is just like the duplex original to duplex copy or simplex copy mode with the stack mode To make more sets of copies or...

Page 17: ...ginal feed starts from the stack original feed table The numbers 1 to 10 identify the originals The chart means that the 10 originals are recirculated three times 2 3 4 5 6 7 1 8 9 10 2 3 4 5 6 7 1 8...

Page 18: ...he copy run two sets of five duplex copies are completed 5 When the LCT is used the original to be copied starts being fed from the stack original feed table and the paper for it starts being fed from...

Page 19: ...nt of the copy next to the cover or slip sheet resulting in having the reverse side of the cover and slip sheets blank In the duplex original to duplex copy mode the reverse side of the designated ori...

Page 20: ...to the stack feed table it is not inverted As a result the front side image side of the designated original only faces the direction of the reverse side of the other originals and stacked in the stack...

Page 21: ...copying speed the copier cannot catch up with the switching to a cover sheet from the normal paper when the last original is detected When the last original is detected while the paper is being fed th...

Page 22: ...Lower limit sensor Paper set sensor Back fence HP sensor Jogger HP sensor Right upper door sensor Eject junction sensor Lower duplex end sensor Upper duplex end sensor Duplex exit sensor Cleaning coi...

Page 23: ...Agitator motor Toner supply motor Pick up solenoid OPC cleaning motor OPC cleaning brush drive solenoid Tracking motor OPC motor Oscillating motor OPC cleaning brush pressure solenoid Left shield mot...

Page 24: ...Inside and outside ozone exhaust fans ID sensor blower Cleaning coil cooling fan PCB cooling fan DC power cooling fan Exposure cooling fan Flash blower Rear cooling fan 2nd fusing cooling blower 1st f...

Page 25: ...drive board Paper feed control board Dehumidification heater Registration sensor Toner density control board PCC power pack Potential sensor Outside ozone exhaust fan battery DC power supply Total co...

Page 26: ...ness relay board Length sensor Display board SADF set sensor Registration sensor 2nd transport sensor 1st transport sensor Reverse motor SADF exit gate solenoid Reverse junction solenoid Blower contro...

Page 27: ...osition sensor Overrun control board Power transformer Dehumidification heater Lower limit sensor LCT size sensors 5 Paper end sensor Tray motor Pick up solenoid Transport motor Upper cover safety swi...

Page 28: ...front door safety switches Stopper HP sensor Inverter transport motor Stopper drive motor Inverter junction gate solenoid Inverter control PCB Inverter 3rd sensor Inverter 2nd sensor Inverter entrance...

Page 29: ...sor Finisher front door safety switches Stapler unit HP sensor Shift motor Shift tray half turn sensor Exit unit HP sensor Staple motor Finisher transport Motor Jogger Motor Stapler drive motor Positi...

Page 30: ...or OPC motor Development motor Main motor Tray 1 2 3 motors Horizontal transport drive gear Duplex feed motor Fusing unit drive pulley Paper exit unit drive pulley Vertical transport drive pulley Agit...

Page 31: ...RDH Reverse motor Transport motor Original feed magnetic clutch Original feed motor Drive Layout Diagram 1 July 1994 1 28...

Page 32: ...1 7 2 LCT Transport motor Paper feed motor Paper feed magnetic clutch Horizontal transport drive gear Tray motor 1 July 1994 Drive Layout Diagram 1 29...

Page 33: ...1 7 3 Finisher Inverter section Inverter transport drive belt Stopper driver motor Inverter transport motor Rear stopper drive belt Front stopper drive belt Drive Layout Diagram 1 July 1994 1 30...

Page 34: ...ift motor Exit drive motor Upper transport drive belt Lower transpoort drive belt Finisher transport drive belt Finisher transport mtor Stack feed out motor Jogger drive belt Jogger motor Stapler driv...

Page 35: ...wer Front cooling fan Rear cooling fan 2nd fusing cooling blower Inner cover cooling fan DC power cooling fan Eraser blower 1st fusing cooling blower Cleaning inside cooling fan Cleaning roller Exposu...

Page 36: ...SECTION 2 SECTIONAL DESCRIPTIONS...

Page 37: ...al transport roller Registration sensor Paper dust removal roller Paper dust tray Pinch roller Grip roller Pick up roller Paper feed roller Reverse roller Registration roller Paper width sensor Paper...

Page 38: ...er end The paper feed motor is used with the FRR system which has a magnetic torque limiter The vertical transport unit and registration roller trans port paper Employs the paper feed motors for each...

Page 39: ...LT LG Width 1 o o o Width 2 o o Width 3 o o Length o Non interrupt o Interrupt NOTE Paper Size Units mm inch A3 297 x 420 B4 257 x 364 A4 210 x 297 B5 182 x 257 DLT 279 x 432 11 x 17 LT 216 x 279 81...

Page 40: ...en the lift rods are raised the paper is also raised The upper surface of the paper contacts the pick up roller and raises it a little Next the actuator enters the upper limit sensor The tray motor th...

Page 41: ...tless paper feed if the paper size is the same paper feed starts from the next tray If limitless paper feed is not selected paper feed stops when paper end is detected When paper end is detected the t...

Page 42: ...rotation of the paper feed roller This action feeds paper The first paper feed sensor detects the paper and turns ON the pick up solenoid The pick up roller raises and the load on the paper is reduced...

Page 43: ...oller with the moving paper When two or more sheets of paper are fed when friction force between the paper is small for example the rotation of the paper feed roller is transmitted to the top sheet bu...

Page 44: ...ed timing control see the timing chart section for details 2 1 7 Drive mechanism The paper feed motor rotates the paper feed roller and the registration motor rotates the registration roller Other rol...

Page 45: ...sor on the rear of the tray 3 when humidity reaches 62 3 These function even when power is not supplied to the main motor There is no dehumidification heater for tray 1 since the heaters for the lower...

Page 46: ...2 1 11 Paper feed operation Circuit diagram Paper Feed 1 July 1994 2 10...

Page 47: ...starts 3 5 sec after ON 2 The paper feed signal is generated from the main control board 1 6 5 3 4 690P 2 1 505 Registration sensor Pick up SOL Pick up roller 3rd paper tray Reverse roller Paper feed...

Page 48: ...g changes according to the feed timing control see below 6 The paper passes over the registration sensor and stops at the registration roller The paper feed timing signal turns on the registration mot...

Page 49: ...ossible Causes Paper dust in the machine especially in the cleaning unit makes dirty background copy Paper dust removal roller and mylar are not contacting properly Jams during copying and jam indicat...

Page 50: ...a guide wire double nut a mirror positioning screw and a guide eccentric cam The right and left shields are independently driven by stepping motors The home position is detected by a photosensor A he...

Page 51: ...urpose the power charged to light the xenon lamp is discharged under the following conditions 1 When a Service Call or Error Reset condition is detected and the machine is stopped during copying or op...

Page 52: ...ool 5 04 I O test mode or the charge key blue push switch installed in the flash power supply unit be sure to discharge it by turning off the main switch or using the I O test mode before accessing th...

Page 53: ...ear auxiliary reflectors adjustment Turn the hexagonal socket head clockwise in the direction of the arrow to raise the adjusting nut The holder can be moved in the direction of the black arrow with i...

Page 54: ...t is fixed to the 1st mirror housing and the 1st mirror housing moves along the grooves of the 1st mirror guide rod and the housing guide The 1st mirror housing includes the lens holder The lens holde...

Page 55: ...l size and the magnification HP sensor detects the home position When you turn ON the main switch the mirror lens motor rotates and the home position sensor actuator passes through the magnification H...

Page 56: ...the 1st mirror Use the 1st mirror adjustment screws to adjust the 1st mirror angle Angle of the 1st mirror housing Use the guide eccentric cam to adjust the 1st mirror housing angle swings to the left...

Page 57: ...ield home position is the A4 full size position and transfers to other specified positions are done by using this position as reference Left shield screen The shield area of the left shield screen is...

Page 58: ...sure area for A4 size paper 210 mm long Magnification Shield Position Exposure Area 142 Left shield 24 mm 257 24 233 mm Right shield 257 mm 100 Left shield 55 mm 300 55 245 mm Right shield 300 mm 64 L...

Page 59: ...2 2 7 Optics operation Circuit diagram 1 July 1994 Optics 2 23...

Page 60: ...ty level Level 6 7 Standard step F Level 5 F 1 step Level 4 F 2 step Level 1 2 3 F 3 step The standard step F is the flash output voltage that is determined by the process control Example If the stand...

Page 61: ...ad connection 44 Problem Left shield screen error 45 Problem Right shield screen error The feeler did not come to the shield HP sensor when copying started Cause Broken connection left or right shield...

Page 62: ...et An optical discharge from the back side of the OPC belt by the quenching lamp An elastic rubber roller that prevents damage to the OPC belt back side by the developer or cleaning carrier The tracki...

Page 63: ...to outside light The OPC is especially sensitive to short wavelength light such as blue and violet If exposed to direct sunlight this will cause partial changes in the ability of the OPC to function p...

Page 64: ...e lock pawl on the rear of the release shaft engages the OPC unit with the main body rear frame This prevents the OPC unit from being pulled out while the back up roller is set When the lever is turne...

Page 65: ...on the inner side of the release shaft to provide the same function as for the cleaning backup roller OPC cleaning brush back up roller The backup roller is fastened to the side plate of the OPC unit...

Page 66: ...The principle of offset correction The tracking mechanism corrects offset in the OPC belt The OPC sensor monitors rear edge of the OPC belt If it moves away from the correct position the OPC sensor d...

Page 67: ...rmful ultraviolet radiation that can cause optical fatigue The discharge brush removes the charge on the OPC belt base produced by friction during operation This prevents electric shocks to technician...

Page 68: ...the OPC belt can be removed 2 3 8 OPC unit drive The OPC motor built into the OPC unit drives only the drive roller via a timing belt Usually the OPC belt is rotated by the OPC motor at a speed of app...

Page 69: ...2 3 9 OPC unit operation Circuit diagram 1 July 1994 OPC Unit 2 33...

Page 70: ...reaches 175 C the OPC motor starts turning then stops OPC idling mode During this period the main motor repeats turning on and off three times The first rotation is to feed out any sheets in the pape...

Page 71: ...stops as shown to the right Since the proportion of A4 copies is high the stop position is shifted on the basis of A4 copying even when B4 copies 4 segments or A3 copies 3 segments are made Timing It...

Page 72: ...rs drive board turns on for the main motor overload LED 4 turns on for the OPC motor overload Cause Increase in motor torque or load side torque 36 Problem Tracking motor error The sector sensor is no...

Page 73: ...by the motor and moves the charge wire cleaner to clean the charge wires and grid wires Ozone in the charge corona unit is ventilated by two fans Charge wire cleaner Grid wires Charge corona wires Scr...

Page 74: ...voltage In the process control the grid voltage is divided into 32 steps at a rate of 28V step Normally 650V is applied to the grid wire as a set value but even if the discharge from the charge wire...

Page 75: ...n the wire position from causing a contact with the pad Cleaning is conducted when the main switch is turned on after 20 000 or more copies have been made 2 4 4 Ozone exhaust mechanism If ozone genera...

Page 76: ...2 4 5 Charging operation Circuit diagram OPC Charge 1 July 1994 2 40...

Page 77: ...to the home position Even if the cleaner stops at some point other than the home position a reverse signal is input to return the cleaner at power on Motor operation time is for 30 seconds at the mos...

Page 78: ...r pattern level in service tool 4 02 Then the grid voltage is compensated so as to be the same potential as the selected pattern level and the second charge is conducted The electric latent image of 4...

Page 79: ...f the leakage oc curs more two times three times total in 100 continuous copies Cause Dirt on the wire end block and casing contaminated by toner paper dust hair etc wire broken or cut SC52 Problem Cl...

Page 80: ...diagram Construction 186 LEDs erase unwanted areas from the electric latent image formed on the OPC Contamination of eraser by toner is prevented by air flow Eraser OPC Eraser Erase Erase mechanism Er...

Page 81: ...riginal is used in these modes In the platen cover mode the paper size is used to determine the erase lighting area In this case one more LED each lights at the front and rear as compared with the ADF...

Page 82: ...2 5 4 Eraser operation Circuit diagram Erase 1 July 1994 2 46...

Page 83: ...transport release spring is used to release the trans port unit The positions of the T S corona and transport units are separately maintained Transport belt Separation corona wire Transfer corona wir...

Page 84: ...om the transfer separation power pack Transfer output DC 140 2 A 5 7KV Separation output AC200 5 A DC 25 5 A AC6 3KV DC 0 8KV 2 6 3 Transport belt drive mechanism The transport belts are driven by the...

Page 85: ...applied If a portion A shifts up or down the return force of the spring works 2 6 6 Transfer separation and transport unit positioning The position of the T S corona unit is determined by the OPC trac...

Page 86: ...2 6 7 Transfer separation operation Circuit diagram Image Transfer and Paper Separation 1 July 1994 2 50...

Page 87: ...paration leak Deteriorated or broken wire When a transfer or separation leakage occurs first time the paper feed jam indicator loca tion A stays ON on the display panel In case of a real paper jam the...

Page 88: ...er from the cleaning unit A sensor monitors the rotation of the cleaning coil that sends used toner Cleaning filter Doctor blade Cleaning carrier inlet Fusing entrance guide PCC power pack Cleaning ro...

Page 89: ...result the charge corona can easily make a uniform surface potential 2 7 3 Cleaning mechanism Bias application method The cleaning power pack is positioned in the rear center of the main body and is w...

Page 90: ...roller Because a high negative voltage is applied to the positively charged toner the collected toner on the cleaning roller might be re attracted to the OPC surface which is given a positive charge b...

Page 91: ...ning carrier Then the toner on the cleaning roller is collected by the scavenging roller because the roller is supplied with higher bias voltage than that of the cleaning roller The scavenging blade c...

Page 92: ...leaning carrier is sent to the upper part of the unit An air hole is provided on the bronze seal of the scavenging blade to send air to the upper part of the unit These air flows cool the unit inside...

Page 93: ...This means that the toner collecting coil is smoothly turning and sending used toner to the toner cartridge When the collecting tube is clogged with toner the friction drive disk begins to slip with t...

Page 94: ...2 7 7 Cleaning unit operation Circuit diagram Cleaning 1 July 1994 2 58...

Page 95: ...ata but as an SC in the 3 07 screen After that SC13 will be indicated on the display panel if the leakage occurs more two times three times total in 100 continuous copies Cause PCC wire end block or c...

Page 96: ...noid brings the brush into contact with the OPC during the OPC cleaning mode Independent drive system using a dc motor Drive unit main body side Outer casing Oscillating motor Inner casing OPC cleanin...

Page 97: ...and uneven scraping on the OPC 2 8 3 Pressure mechanism The OPC cleaning brush is designed to contact the surface of the photoconductor only when it is operating If it is always in contact with the O...

Page 98: ...If an overload condition is detected power to the motor is interrupted to stop the motor 2 8 5 Disabling the OPC cleaning mode If you want to disable the OPC cleaning mode for maintenance open the fr...

Page 99: ...2 8 6 OPC cleaning brush operation Circuit diagram DC drive board Main OPC motors drive board Drive solenoid Pressure solenoid 1 July 1994 OPC Filming Removal 2 63...

Page 100: ...2 8 7 Timing chart OPC Filming Removal 1 July 1994 2 64...

Page 101: ...e shutter operation of the cartridge An independent dc motor drives the unit A blower sends air to the ID sensor to prevent the sensor from becoming dirty Separator Toner density sensor Toner cartridg...

Page 102: ...use the photoconductor is charged negatively and the toner is friction charged positively negative potential is applied for the development bias 2 9 3 Developer agitator mechanism The developer fed to...

Page 103: ...the toner density If the toner density in the developer drops below the reference value the toner supply motor is turned ON and the supply roller turns At the same time the agitator motor is turned O...

Page 104: ...tch is turned on The machine then indicates a guidance of Pull the cartridge shutter on the guidance display By pulling and then pushing in the cartridge shutter the cartridge shutter switch is turned...

Page 105: ...ter the main switch turns on thereby keeping the sensor surface clean 2 9 10 Bearing toner protector The G seal and V seal prevent toner from accumulating on the bearings The V seal is fitted with a r...

Page 106: ...2 9 11 Development operation Circuit diagram Development 1 July 1994 2 70...

Page 107: ...nt to output 1 1st and 2nd development rollers and control signals B5 B9 are sent to output 2 3rd development roller The bias voltage is controlled by the selected image density level including the AI...

Page 108: ...e OPC and the potential of a certain area see figure is measured by the potential sensor The bias voltage corresponding to the measured potential is applied to the 3rd development roller For the 1st a...

Page 109: ...the OPC surface The ID sensor measures the OPC or paper again after closing the front door SC23 will light if there is 0 5 volts or more difference in the ID sensor measurement between before and afte...

Page 110: ...conditions such as temperature and humidity To make image density steady the toner density control is modified by the ID sensor 2 10 2 ID sensor operation ID sensor pattern production timing When the...

Page 111: ...with the selected ID sensor pattern level in the service tool 4 02 If the measured value differs from the selected ID sensor pattern level OPC is erased and charged a second time For the second charge...

Page 112: ...er density sensor reference value is raised 0 12 volts to increase the toner density in the development unit Conversely when VSG VSP is more than 9 0 the reference value is lowered 0 12 volts ID senso...

Page 113: ...d 3 If toner consumption cannot be covered by the predetermined toner supply rate during 25 copies the rate is increased by one step During more 25 copies if it cannot be covered the rate is increased...

Page 114: ...pply mode Sensor output 2 min lapse Sensor output has risen 0 12V or more Increase toner supply rate by 1 step Increase toner supply rate by 1 step Copying end Toner supply motor OFF Yes Yes A ON TONE...

Page 115: ...ridge set switch OFF No Yes During copying 500 copies or more were made No Yes RET Start Toner end or near end display Cartridge set switch ON Cartridge removed Yes Agitator motor OFF Cartridge set di...

Page 116: ...reads the OPC surface potential with an electrometer and feeds compensation signals to various units around the OPC Generally the OPC sensitivity does not show a constant value but depends on the ope...

Page 117: ...copies the black VD or white potential VL is alternately measured The residual potential called VR is the potential after removal of charge by the quenching lamp of the OPC unit At power on of the mac...

Page 118: ...is set by service tool 4 01 Therefore VD after compensation is increased by the residual potential VR more than the initial VD White potential VL compensation After VD compensation the OPC has the sa...

Page 119: ...bias output is changed One step shift of the bias output is 15 volts and 3 steps maximum shift at one time OPC rest time compensation V0 compensation The sensitivity of the OPC and the operating envi...

Page 120: ...ne the next time the OPC belt does two or more rotations This is to stabilize VPCC After the OPC surface is discharged by the PCC charging and exposing are not done and the potential sensor senses the...

Page 121: ...2 11 3 Process control flow 1 July 1994 Process Control 2 85...

Page 122: ...by the transfer corona and the quenching lamp clears it Then the potential sensor B sensor senses the OPC surface VR compensation is done at power on and after every 500 or more copies For the V0 mea...

Page 123: ...an value of the results is used to determine VD compensation for the grid output VD and VL compensations are alternately done after every 10 copies during the copying run These measurements and compen...

Page 124: ...the lamp The white pattern is dirty The grid output fluctuates Also the flash output fluctuates and shortens the life of the lamp The black pattern is dirty The grid output rises The flash output als...

Page 125: ...ng exit roller Grip Fusing exit guide plate Pressure roller Fusing entrance guide plate Right oil skimmer Thermistor 20o C 37 K Thermofuse 192o C Left oil skimmer Metering blade Hot roller Upper oil p...

Page 126: ...e pressure The pressure roller is surfaced with a Teflon tube to prevent swelling 2 12 3 Oil supply mechanism Oil is applied directly to the hot roller from the oil supply pad The rubber metering blad...

Page 127: ...ow and pump the oil Oil flow Pumped silicon oil drops from the oil tube outlet into the oil receiver and flows into the oil sump The oil flows to the bottom of the oil sump where it is absorbed into t...

Page 128: ...unit The main motor drives the fusing unit s joint gear which drives the hot roller The fusing exit rollers are rotated by a relay gear The pressure roller is friction driven by the fusing roller Pre...

Page 129: ...Fusing operation Circuit diagram DC motor DC drive board Main control board Interface board U S A version DC motor DC drive board Main control board Interface board European version 1 July 1994 Fusin...

Page 130: ...m Fusing low temperature fusing unit temperature is 130o C or less for 20 seconds Cause Fusing lamp broken thermistor failed fusing lamp not connected door switch broken or re lay failure SC3 Problem...

Page 131: ...system Selection of normal paper feed out or sorter feed out by the eject junction gate Duplex paper feed motor used for paper feed and the drive system of the main motor is used for paper trans port...

Page 132: ...y is pressed while in duplex mode the duplex entrance junction solenoid comes ON after approximately 5 seconds At this time the front edge of the copy paper is approximately 46 mm before the duplex ju...

Page 133: ...ition for the specified paper size The fences then stop The sensors are activated by feelers mounted on the fences when the fences are their home positions Back and jogger fences stop positions The ba...

Page 134: ...t amount of air to the leading edge of the paper in the duplex tray If the air volume is too high the lowest sheet of the stack cannot be transported by the belts If it is too low a multifeeding may o...

Page 135: ...The clutch for the paper feed roller ensures that the paper continues on after it is picked up by the grip roller The other clutch on the paper feed roller drive shaft prevents reversing of the transp...

Page 136: ...tration roller is the same as that used on the paper feed tray Duplex paper end sensors The duplex paper end sensors one set of light emitter and receiver are positioned on the upper side of the duple...

Page 137: ...xit unit is driven by the main motor This driving force is transmitted to the unit through the gears of the main body In the unit the transport rollers excluding the duplex feed roller are driven by t...

Page 138: ...2 13 9 Duplex exit operation Circuit diagram Duplex and Paper Exit 1 July 1994 2 102...

Page 139: ...de Duplex entrance junction sensor Eject junction gate Duplex entrance junction gate Eject tray sensor Eject junction sensor Fusing exit sensor Duplex exit sensor Duplex paper feed sensor 1 pulse 1 mm...

Page 140: ...position of the jogger and back fences is done for the accuracy of the home position The distance of the jogger and back fences from the home positions to the specified size position is controlled by...

Page 141: ...solenoid is deter mined 0 1 second after determining that all the paper on the tray has been fed 6 When using the ADF the duplex paper feed signal is generated at a fixed interval after stacking is fi...

Page 142: ...ged 2 13 11 Error reset 70 Problem Jogger fences error The jogger HP sensor does not come ON within a fixed time Cause Fence overload jogger HP sensor failure jogger motor failure connector contact fa...

Page 143: ...rse sensor SADF exit sensor Reverse entrance roller SADF exit roller Reverse exit roller SADF exit gate plate Reverse junction gate pawls Original feed roller Antistatic brush Relay rollers 1st transp...

Page 144: ...g edge of the original is positioned on the recycle arm sensor and the original set sensor detects the original The original stopper stop position for 11 x 81 2 or 14 x 81 2 originals is not used usua...

Page 145: ...its position until a different signal is generated This works using a permanent magnet installed in the solenoid When a original feed signal solenoid plunger pull signal is generated the lever moves...

Page 146: ...on are provided by two turbine fans on one blower A brushless dc servomotor with reduced wear noise and electrical noise is used in the ADF blower to ensure long life and high reliability Shutter sole...

Page 147: ...r the air knife is increased SADF paper feed When the SADF set sensor detects the original the entrance gate plate is opened by the entrance gate solenoid and the original feed motor starts turning At...

Page 148: ...The 1 way clutch is built into the turn roller drive pulley so that the rollers turn freely while the original is transported by the transport belt This also enables operators to remove misfed paper...

Page 149: ...he solenoid plunger and gate pawls are pulled down by the spring to guide the original in the reverse section When the solenoid is ON the original is guided to the intermediate transport unit side Int...

Page 150: ...clutch Transport belt drive roller S3M189 60 Transport belt Intermediate transport drive pulleys Original feed roller Reverse junction pawl Reverse motor SADF exit gate plate Reverse exit roller Reve...

Page 151: ...t to the reverse section by the reverse entrance and switchback rollers During this period drive is transmitted through the 2 sided timing belt to timing belt S2M150 80 by the switchback roller drive...

Page 152: ...2 14 8 Timing chart SADF mode Condition Two A4 copies from an A4 original ADF 1 July 1994 2 116...

Page 153: ...Single side original mode with sort stack mode Condition One A4 copy each from three originals 1 July 1994 ADF 2 117...

Page 154: ...Duplex original mode with stack mode Condition One A4 copy from one original ADF 1 July 1994 2 118...

Page 155: ...signals from the main control board SADF mode Original feed motor Registration gate SOL Registration gate plate Entrance gate plate SADF set sensor Registration sensor Entrance gate SOL SADF exit gate...

Page 156: ...ADF 1 July 1994 2 120...

Page 157: ...below NOTE 3 feed When A4 or smaller originals are used 3 sheets are fed until the first fed original stops on the exposure glass 2 feed For larger than A4 originals 2 sheets are fed Original stopper...

Page 158: ...original start Transport sensor 2 d 2nd original stops then starts 1st original stops then starts Timing d Transport belt Timing f Timing e Registration sensor Transport sensor 1 f e ADF 1 July 1994 2...

Page 159: ...riginal Reverse sensor 1 2nd original Reverse sensor 2 Registration sensor 1st original reversing Exit sensor Next original to reverse section Original fed out are stacked Exit sensor 1 July 1994 ADF...

Page 160: ...Duplex original mode with stack mode Reverse sensor 1 Reverse sensor 2 Reverse junction gate Transport sensor 1 Transport sensor 2 Reverse junction gate ADF 1 July 1994 2 124...

Page 161: ...Exit sensor 1 July 1994 ADF 2 125...

Page 162: ...2 14 10 ADF operation Circuit diagram ADF 1 July 1994 2 126...

Page 163: ...service tool but is recorded as an SC If this is repeated 4 times Error reset is indicated on the display panel Cause Motor jam motor encode failure 84 Problem ADF transmission error A communication...

Page 164: ...2 15 1 DC power supply unit In this unit each DC power supply is generated from wall outlet and is supplied to each load Connector Layout U S A version Connector Layout European version Electrical Co...

Page 165: ...er supply and agitator motors solenoid relay and each power pack control line F 24 Power supply for paper feed registration OPC cleaning toner supply and agitator motors K 40 Main motor H 24 Power sou...

Page 166: ...ows the operation of the copier without entering any user codes even in the normal and security accounting modes 1 Disables the initial service tool access code 99900 2 Allows the selection of the nor...

Page 167: ...D 118 TXD Operation unit transmission data 119 RXD Operation unit receiving data Table of connector destinations No CPU Destination 101 M Printer connector 102 M Sensors switches and detection signals...

Page 168: ...ntrol board The sequence CPU mainly controls the image formation sequence of the OPC while the main CPU controls the whole system Their data are exchanged through the dual port RAM 2 1 1 2 1 I O Input...

Page 169: ...goes low L again and the CPU stops each I O operation RAM backup When the 5V line is normal Q102 and Q104 are turned ON and 5V is supplied to RAM and RTC When the 5V drops due to a power failure etc...

Page 170: ...pulse for mirror lens motor 305 Clock pulse for back fence motor 306 Clock pulse for duplex paper feed motor 307 Clock pulse for LCT motor 308 Not used 309 Clock pulse for 1st paper feed motor 310 Clo...

Page 171: ...itch is defective or SC 3 lights in this case blue wire side is defective The ac line of each door switch is defective There is no display Paper feed DC power supply is defective The development motor...

Page 172: ...ray This facilitates loading paper on the tray Horizontal transport unit driven through the duplex exit unit The upper transport unit is driven by the transport motor Tray lock release mechanism and d...

Page 173: ...interrupts the lower limit sensor and the motor stops Overrun switches are provided for the upper and lower limits When the upper limit feeler is lifted by the paper the upper overrun switch is turned...

Page 174: ...ism similar to that used in the main body tray but the grip roller is driven by the transport motor via a magnetic clutch The transport motor drives the upper transport unit and is always ON to transp...

Page 175: ...setting When the tray is raising the back fence moves to the tray center Conversely when the tray is lowering the back fence moves to its home position rear side of the tray The back fence is driven b...

Page 176: ...r is driven by the transport drive belt from the transport motor The transport sensor detects jams in the upper transport unit 2 16 8 Other mechanisms Tray lock release When the bottom plate of the tr...

Page 177: ...provided on the lower part of the tray prevents the paper from absorbing moisture The heater is designed to come on when humidity reaches 62 3 The humidity sensor mounted on the main body turns the he...

Page 178: ...2 16 9 LCT operation Circuit diagram Large Capacity Tray 1 July 1994 2 142...

Page 179: ...DC drive board paper feed motor DC drive board DC motor AC 230V 1 July 1994 Large Capacity Tray 2 143...

Page 180: ...0 seconds no encoder signal Cause Connector failure sensor failure wire break motor failure drive board failure encoder error overrun switch broke while the tray was raising and lowering 64 Problem LC...

Page 181: ...pies Staple unit paper positioning Copies are properly squared in the jogger unit by the jogger fences brush rollers and positioning rollor Jogger movement The jogger fences move according to the copy...

Page 182: ...ough the inverter unit the paper enters the finisher If the sort stack mode is selected the junction gate A directs the paper upwards to transport it to the shift tray B In these modes the shift tray...

Page 183: ...es to the right The copies are sent to the finisher part and fed out to the shift tray without paper inversion 2 17 4 Inverter stopper operation When the finisher ON signal is sent to the inverter con...

Page 184: ...is initialized to the upper position The tray s upper most position is detected when the shift tray pushes up the actuator D to de actuate the stack height sensor 1 E While copying the actuator D is...

Page 185: ...r alignment the positioning roller C and the alignment brush roller D push the copy against the stack stopper E After the trailing edge of the copy passes the jogger unit entrance sensor F the positio...

Page 186: ...omers can select one of the following three different staple modes Staple 1 Top left Staple 2 Bottom left Staple 3 Top Bottom left The stapler drive motor A stepper motor moves the stapler B from side...

Page 187: ...B This is to prevent paper jams when a thick paper stack is exiting The exit unit lift motor stops when the exit unit half turn sensor C is actuated While the paper stack is exiting the exit unit lift...

Page 188: ...otor Inverter Junction Gate Solenoid Jam Detection 1 1 sec Timer 594 ms 362 ms 332 ms 209 ms 471ms 270 ms 40 ms 120 ms 40 ms Entrance SN ON 2 sec Timer Entrance SN OFF 745 ms 2nd SN ON 540 ms 3rd SN 3...

Page 189: ...es according to paper size This is to have the leading edge of the paper hit against the paper stoppers gently 3 Just when the paper leading edge hits the paper stoppers the stopper drive motor starts...

Page 190: ...otor Pulse Exit Drive Motor Pulse Exit Drive Motor Pulse Shift ON From Copier Busy From Finisher Exit From Finisher Finisher ON From Copier Stack Height Sensor 2 Stack Height Sensor 1 245 ms less than...

Page 191: ...oon if the copy stack on the shift tray grows during a continuous copy run If the sensor remains ON for 3 seconds while copying the shift tray is lowered for 50 milliseconds When the shift tray rise m...

Page 192: ...sor Timer Transport Drive Motor Pulse Stack Feed out Motor Pulse Exit Drive Motor Pulse 450ms 200ps 70ps 125ps 600ms 156ps A4 sideways 67ps OFF 100ms 20ps 230ms 100ms 25 ps 42ps 100ms 67ps 67ps 1119ps...

Page 193: ...ray is removed This is because the stack height sensor 1 is always ON while in this copy mode To counter this when the shift tray rise mode is selected by turning on DIP switch 101 1 on the finisher c...

Page 194: ...the LCT inverter unit and sorter refer to related section Fusing exit sensor Duplex entrance junction sensor 1st and 2nd duplex paper feed sensors Eject junction sensor Eject tray sensor Transport se...

Page 195: ...tarts from the original of the jammed copy To suspend copying Paper remaining in the machine is fed out automatically into the copy tray In the ADF mode the originals are put in order In the SADF mode...

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