Service Manuals generally provide information and instructions pertaining to product disassembly, schematic diagrams, parts lists, exploded views, troubleshooting guides, wiring diagrams, and much, much more. Not all appliances and electronics have Tech Sheets or Fast Track publications.
Training Manuals generally contain more in-depth servicing information and circuit explanations. Page 20 Pick-up cassette cover!
Page Cross Section! Page 26 On when the printer requires a service call. Blinking when the printer requires operator intervention e. Page 29 Prints made using a cartridge older than its service life may have low image quality, making it important to use up each cartridge before the end of its service life. Be sure that the label side faces 7 Do not disassemble the cartridges.
Page 31 9 Do not touch the protection shutter of the toner cartridge. Page Image Formation The toner image on the intermediate transfer drum is then transferred to paper sec- ondary transfer , and fused to generate a color print.
Page Development Block p. Page 47 B. Electrical Circuitry Controlling the Main Motor Page C. Page 54 If the drum cartridge is present, '1'. For details, see p.
Page 57 '0'. Page 59 For details, see p. Separation static J J Controls the bias for separation eliminating static elimination. Page 60 When installing the reader unit, the printer unit power switch is turned on and blocked with a face plate; as such, it remains on at all times.
Basic Sequence when the power switch is turned on. Page 63 For the sequence used to make prints when the reader unit is installed, see the Reader Unit Service Manual. Page 66 For the sequence used to make prints when the reader unit is installed, see the Reader Unit Service Manual. Page 68 Reader controller PCB when making copies with the reader unit installed. Page Laser Exposure System A. Page Outline PCB ; then, they are converted into two sets of low-voltage differential signals Note with suppressed radiation noise, and are sent to the laser driver PCB.
Page 72 The printer unit generates two sets of signals differential signals to avoid a decrease in the noise margin, otherwise caused by low amplitude. Reader controller PCB when making prints with the reader unit installed. Page 80 To ensure correct laser rotation revolution , the printer unit controls the motor including its phase.
E Fault in the laser scanner motor, or a BD fault. Be sure also to remove the printer side power cord and the interface cable. Page Printer Unit External Covers! Page 84 3 Open the right cover, and loosen the two screws. Page 86 3 Remove the two screws. Page 88 LED assem- bly. Page 91 3. Page Door Switch Actuator 2 Remove the screw from behind the front right cover, and detach the door switch actuator 4 pc. Page 94 Figure shown. They cannot be adjusted in the field. Page Image Formation System B.
Locking the Secondary Transfer Cleaning Page Operations The paper is then separated from the secondary transfer belt and sent to the fixing assembly. Page This is why each color developing cylinder is moved away from the photosensitive drum when developing black toner. Page Separation static eliminator Secondary transfer belt Figure Reader controller PCB when making copies with the reader unit installed.
Reader controller PCB when making copies with the reader unit installed. Page If you have replaced the drum cartridge, be sure to execute auto gradation correction control in user mode.
Page Development SW , and the toner antenna inside the black toner cartridge is used to detect the level of black toner. Page Reader controller PCB when making prints with the reader unit installed. Reference: E fault in the developing rotary assembly. Reader controller PCB when making prints with the reader assembly installed. Page DC component when it deals with the second and subsequent colors.
Page p. Rear controller PCB when making prints with the reader unit installed. Page The level of the fixing separation DC bias, further, is kept to a specific level. Page Other Control Mechanisms The motor torque would fluctuate according to the speed of the motor, requiring vari- ation of the current level.
Page Controlling The Cartridge Motor IC rotates the motor clockwise when the color toner cartridge is used, while it rotates the motor counterclockwise when the black toner cartridge is used. Page Figure remove the four screws; then, detach the drum motor. If it must be left out of the copi- er for a long time, be sure to put it in a Protective shutter protective bag.
Exposing the drum to light for a long time will affect print images. If absolutely necessary, use a flannel cloth. It will dam- age the surface of the drum. Further, never use solvent. Note: After replacing the drum cartridge, be sure to execute auto gradation correc- tion. Removing the Secondary Transfer 7. Figure q Lever w Secondary transfer belt assembly 4 Using a high-accuracy screwdriver, free the two springs from the stay. When replacing the secondary transfer belt assembly, take care not to touch the belt.
Do not clean the belt. When removing the secondary transfer belt assembly, be sure to remove the separation static elimi- nator in advance. After mounting a new secondary q transfer belt assembly to the printer unit, be sure to remove the protec- tive sheet wrapped around the belt q Spring assembly.
Releasing knob Claw Point of Removal q Releasing knob. Note: 3 Holding the releasing lever, pull out Take care not to touch the surface of the separation static eliminator hori- the roller.
Removing the Separation Static Eliminator 1 Open the front cover. Caution: When replacing the separation static q Releasing button eliminator, take care not to touch the w Releasing lever 2 charging wire. PCBs 2. Connectors to the high-voltage remove the rear cover. PCB 2 are found on the back of the 2 Perform the steps on p. PCB horizontally. It is for the factory only. Removing the Separation Static 8.
Figure Note: When replacing the density detection 3 Remove the two screws. PCB, take care not to touch the sensor assembly. Removing the Sub Transformer 1 1 Perform steps 2 through 5 on p. Removing the Sub Transformer 3 1 Perform the steps on p. Removing the Sub Transformer 2 2 Perform steps 2 through 5 on p. Removing the Color Toner sub transformer 3.
Cartridge Level Sensor 1 Perform steps 2 through 6 on p. Figure e Removing the Color Toner Controlling the pick-up motor In the case of pick-up from the cassette, paper is fed into the printer unit by the pick- up roller and is moved by the feeding roller; in the case of pick-up from the multifeeder, on the other hand, the multifeeder pick-up roller feeds paper into the printer unit.
The orientation of the paper is corrected by the registration roller so that it will not move askew; the paper is then stopped and kept in wait. Intermediate transfer drum Upper fixing roller Multifeeder pick-up Face-up tray roller. Face-up delivery roller Registration Feeding roller 2 Secondary roller Lower fixing roller transfer belt Pick-up roller Feeding rollers 1 Cassette 1 Separation roller.
Cassette 2 Separation roller. Table shows the speed used for each paper type. The feeding speed is switched when paper arrives at the registration paper sensor PS1. The printer unit enters transparency mode when the user selects transparencies on the control panel. To enable the printer unit to identify a transparency, transparency sen- sors 1 and 2 PS, PS; Figure are mounted in front of the pick-up roller.
The marking blocks either of the two sensors PS, PS , causing the DC controller PCB to assume that the transparency is of a type that cannot be used for the printer unit; it then communicates the fact to the print- er board1 and, at the same time, stops the printer unit Note 2.
The sensors are of a feedback type, consisting of a light-emitting section and a light-receiving section. If a transparency exists between the sections, the light from the light-emitting section passes through it to reach the light-receiving section, enabling the DC controller PCB to identify the medium as a transparency, thereby starting transparency mode. The printer unit, on the other hand, uses two fixing heaters, and the high caloric value can cause such transparencies to jam inside the fixing assembly.
Likewise, the printer unit rejects transparencies intended for a color copier identi- fying them as such in response to the marking on the leading edge by stopping the ongoing operation.
Pick-Up Operation The printer unit moves up the paper inside the cassette using a lifter to pick-up posi- tion; then, it brings down a rotating pick-up roller to come into contact with the paper for pick-up. When the cassette pick-up solenoid SL3 turns on, the drive of the main motor is sent to the cassette pick-up cam through gears, and the rotation of the cam moves the lift arm. At the same time, the drive of the pick-up motor is sent through the feeding roller gears to reach the cassette pick-up roller.
The rotating cassette pick-up roller moves down to the stack of paper, and a single sheet of paper is picked up, at the end of which the pick-up roller moves to its initial position and stops. When the pick-up motor rotates clockwise, the pick-up roller of the cassette 1, feed- ing roller 1, and separation roller are driven to pick up paper from the cassette 1.
When the motor rotates counterclockwise, on the other hand, the pick-up roller of the cassette 2, feeding roller 1, and separation roller are driven to pick up paper from the cassette 2. Pick-up roller Cassette pick-up cam. Cassette pick-up solenoid SL3. Pick-up motor M5 Lift-up releasing arm. Feeding roller gear Lift-up cam Pick-up roller shaft fixing arm. Pick-up PCB M4. CL1 CL2. Registration roller Feeding roller 2.
Pick-up Feeding roller roller 1 Separa- tion roller. PS17 PS Cassette 1. The size of the paper inside the cassette 2, further, is identified by the four sensors each mounted to the cassette 1 and the cassette 2; i. Table shows combinations of the states of the cassette size detecting switches.
The level of paper inside the cassette is checked in relation to the position of the lifter used to move up the stack of paper. The lifter is equipped with a light-blocking plate, and the position of the lifter is checked when the light-blocking plate blocks two sensors, thereby enabling the identification of the level of paper. In the case of the cassette 1, the outputs of the cassette 1 paper levels sensor 1 PS and the cassette 1 paper level sensor 2 PS are used; in the case of the cassette 2, on the other hand, the outputs of the cassette 2 paper level sensor 1 PS and the cassette 2 paper level sensor 2 PS are used.
Light- blocking plate Lifter 4. The operation is driven by the main motor, and is executed as in the fol- lowing two cases:. Feeding roller 1 main motor drive Separation Lift arm roller Pick-up roller shaft. Lift-up releasing arm. Lift-up cam Lifter Pick-up roller shaft fixing arm Lift-up arm Lifter gear. When the Cassette Is Slid In q When the cassette is slid in, the main motor starts to rotate, and the cassette pick- up solenoid SL3 turns on.
The drive moves through gears and rotates the cassette pick-up cam to operate the lift arm. Cassette pick-up cam. Pick-up roller shaft main motor drive. Lifter gear Cassette pick-up solenoid SL3.
At the same time, the lift arm is locked to the pick-up roller shaft fixing arm, stopping the pick-up roller shaft at a specific position. Pick-up roller shaft Lift arm Pick-up roller shaft fixing arm Lift-up releasing arm.
Lift-up cam Cassette Lifter gear holding plate Print paper. These opera- tions are repeated to move up the cassette holding plate. Print paper Lifter gear Cassette holding plate Figure At the same time, the pick-up roller shaft fixing arm and the lift-up releasing arm are driven to fix the lift-up cam in place, thereby stopping the lift-up arm and ending the lift-up operation.
Cassette pick-up roller. Pick-up roller shaft fixing arm Lift arm. Lifter gear Lift-up releasing arm. Paper Lift-up cam Cassette holding plate. Decrease in the Stack q When the stack decreases and, as a result, its top surface lowers a specific dis- tance, the pick-up roller moves farther down during pick-up, causing the pick-up roller shaft to push the lift-up releasing arm and the lift-up cam to be freed.
Normal Operation. Pick-up roller movement down Lift-up arm Lift-up releasing arm. Cassette holding plate Lifter gear Lift-up cam. Pick-up roller shaft movement down. Figure e When the pick-up roller comes into contact with the paper on the cassette holding plate, the pick-up roller shaft is moved up, freeing the fixing arm to cause the lift-up releasing arm to move up the pick-up roller shaft to wait position by the force of a spring.
At the same time, the pick-up roller shaft fixing arm and the lift-up releasing arm are driven to keep the lift-up cam in place, causing the lift-up arm to stop and end the lift-up operation.
Preventing Double Feeding The printer unit uses a separation roller to prevent double feeding when pick-up is from the cassette. The separation roller is subjected to a rotating force opposite the rota- tion of the feeding roller. The separation roller is equipped with a torque limiter, and the rotation of the feeding roller 1 from the moving paper normally forces the separation roller to rotate.
In the case of double feeding, however, the weak friction between two sheets of paper makes the rotating force going to the separation roller weak, causing the rotation of the separation roller to move back the extra sheet. Feeding roller 1 Pick-up roller drive from the feeding roller 1.
Separation roller Paper drive from the pick-up roller through a torque limiter. Cassette 1 Last Sheet Detection The printer unit is capable of detecting the last sheet from the cassette 1. The feed- ing distance from the cassette 1 paper absent sensor to the registration roller is short; as such, if the last sheet was picked up during continuous printing, writing would start before the DC controller PCB identifies the absence of paper, requiring the printer unit to detect the absence of paper before writing starts and, ultimately, to prevent soiling between the photosensitive drum and the intermediate transfer drum.
The cassette 1 last sheet sensor PS29 is a reflecting type sensor, and consists of a light-emitting section and a light-receiving section. In the presence of paper, the light from the light-emitting section will be reflected by the paper to reach the light-receiving sec- tion. Last sheet Pick-up roller. Cassette 1 last sheet sensor PS At the same time, it turns on the holding plate solenoid SL4 to free the holding plate so that it may move up , causing the pick-up roller to come into contact with the stack of paper.
If the holding plate is up during the wait period, the holding plate solenoid SL4 is turned on to bring down the holding plate. Thereafter, the multifeeder pick-up clutch CL3 is turned on so that the drive of the main motor M4 is transmitted to the multifeeder tray pick-up roller. The stack of paper butted against the multifeeder tray pick-up roller by the holding plate gives up one sheet in response to the rotation of the pick-up roller. After the extra sheet, if any, has been removed by the work of the separation pad, the paper is moved inside the printer unit.
The operations that follow are the same as in cassette pick-up; however, the holding plate solenoid SL4 is additionally turned on immediately after the registration roller starts to rotate to move down the holding plate. The multifeeder tray paper width sensor PS is mounted inside the feeder tray, detecting the width of paper in relation to the slide resistor operating in conjunction with the size guide plate. Multifeeder tray PCB. Multifeeder pick-up clutch M4 CL3. Registration roller Holding tray solenoid SL4 Feeding roller 2.
Multifeeder Last Sheet Detection The printer unit is capable of detecting the last sheet from the multifeeder.
The feed- ing distance from the multifeeder tray paper sensor to the registration roller is short; as such, if the last sheet was picked up during continuous printing, writing would start before the DC controller PCB identifies the absence of paper, requiring the printer unit to detect the absence of paper before writing starts and, ultimately, to prevent soiling between the photosensitive drum and the intermediate transfer drum.
The last sheet is detected by monitoring the rotation of the last sheet detecting roll mounted to the multifeeder tray by the multifeeder tray last sheet sensor P If two or more sheets of paper exist on the multifeeder tray, the last paper detecting roll will not rotate during pick-up operation.
Last sheet. The pick-up motor is a 2-phase stepping motor, and is controlled by the pick-up motor driver IC for pick-up operation. The motor torque varies in relation to rotation speed, requiring variation of the current level, and the printer unit uses combinations of FEDI0 and FEDI1 signals to find the appropriate current level for each motor speed.
Outline The printer unit switches between face-up and face-down delivery paths using the delivery flapper. Paper on the face-down tray is checked by the face-down tray delivery sensor PS When the face-down tray becomes full of paper, the condition is identified by the face- down tray full sensor PS Face-down delivery roller M4.
Face-up Delivery flapper delivery tray. Upper fixing roller. Face-up delivery roller SL2 Fixing delivery Lower fixing roller. It is then shifted by the reversing roller and moved inside the duplexing unit. When it has been adjusted for horizontal registration by the horizontal registration guide inside the duplexing unit p. The reversing roller rotates in response to the drive from the duplexing motor M8.
The duplexing feeding roller 1 and the duplexing feeding roller 2 are rotated by the drive from the duplexing motor M8 controlled by the duplexing feeding clutch. The duplexing motor M8 is a stepping motor, and is controlled to rotate clockwise and counterclockwise by the microprocessor CPU on the duplexing driver PCB; it is also controlled to rotate at normal or high speed.
The horizontal registration guide is shifted by the drive from the horizontal registration motor M7. Machine internal communications line. Reversing assembly M8 Lower cassette. Reversing Operation When the duplexing command arrives from the DC controller PCB, the duplexing dri- ver PCB turns on the duplexing flapper solenoid SL6 , operating the duplexing flapper so that paper will be moved to the duplexing unit.
Then, a specific period of time after the reversal paper sensor PS26 has detected the trailing edge of the paper, the duplexing driver PCB switches the rotation of the duplexing motor M8 to clockwise direction to switch the paper path so that paper will be moved along the duplexing lower guide to the feeding roller side of the duplexing unit. Note: If paper is not 11x17, A3, B4, or LGL, the duplexing driver PCB first drives the duplex- ing motor M8 and then will switch its rotation to high speed to move the paper to the reversing assembly.
PS26 Duplexing feeding roller 1 Reversing roller releasing Duplexing lower guide plate Duplexing unit. Reversing assembly M8 Duplexing motor. Horizontal Registration Adjustment In duplexing mode, the printer unit performs horizontal registration adjustment so that the middle in main scanning direction of a second page will mach the middle of the print- ing area of the drum by butting the horizontal registration guides against both sides of paper.
At power-on, the duplexing driver PCB drives the horizontal registration motor M7 to move the horizontal registration guide back to its home position.
If the horizontal regis- tration guide is already at its home position, it is first moved away from the home position and brought back to it. When paper is moved into the duplexing unit by the reversing roller rotating clockwise, the duplexing driver PCB checks the duplexing feeding roller 1 to find out if it is at its home position. If not, the duplexing driver PCB turns on the duplexing feeding clutch CL5 to rotate the duplexing feeding roller 1; after making sure that the roller is at its home position, the PCB turns off the clutch to stop the roller.
A specific period of time after the reversing roller starts to rotate clockwise, the duplexing driver PCB turns on the duplexing feeding clutch CL5 to rotate the duplexing feeding roller 1. When the duplexing roller 1 is found to be at its home position, the duplexing driver PCB turns off the clutch to stop the roller. At this time, the paper is stopped where it is not in contact with the duplexing feeding roller 1.
If the paper is not A4R, LTRR, or A5, the duplexing driver PCB turns on the reversing roller releasing solenoid SL7 to free the reversing roller, thereby fully releasing the paper in preparation for horizontal registration adjustment. Duplexing upper guide Duplexing feeding roller 1 Re-pickup Duplexing feeding roller 2 Reversing sensor lever roller releasing plate Duplexing lower guide. Reversing Reversing roller Duplexing unit paper sensor assembly.
When all is ready, the duplexing driver PCB drives the horizontal registration motor for a specific number of pulses based on the paper size data from the DC controller PCB to shift the horizontal registration guide according to the size of the paper for horizontal reg- istration Note. The horizontal registration guide returns to its home position a specific period of time after the leading edge of paper is moved and detected by the duplexing unit paper sen- sor PS The horizontal registration motor M7 is a stepping motor, capable of con- trolling the shift distance with high accuracy.
The duplexing driver PCB will identify a fault in the registration guide if the shift dis- tance exceeds the value stored in advance i. As such, the duplexing driver PCB drives the horizontal reg- istration motor M7 while the reversing roller is rotating counterclockwise to move the horizontal registration guide to a point suited to the paper size. Re-Pickup The duplexing driver PCB turns on the duplexing feeding clutch CL5 at the end of horizontal registration so as to move paper once gain.
About 0. Reversing Reversing roller Duplexing unit paper sensor PS24 assembly. Face-down tray delivery sensor Face-down tray PS11 Face-down delivery roller. Pick-up roller Cassette 2. Wrapping on the Intermediate Transfer Drum The CPU assumes that the paper has wrapped around the intermediate transfer drum if the separation sensor PS5 does not detect the paper within a specific period of time T between 1.
Fixing Delivery Stationary Jam The CPU will identify a fixing delivery stationary jam if the paper does not move past the fixing delivery sensor PS within as specific time T after the sensor has detect- ed the leading edge of the paper. Face-Down Delivery Slot Delay Jam The CPU will identify a face-down delivery slot delay jam if the paper doe not reach the face-down tray delivery sensor PS11 within a specific period of time T after the fix- ing delivery sensor PS has detected the leading edge of the paper.
Face-Down Delivery Slot Stationary Jam The CPU will identify a face-down delivery slot stationary jam if the paper does not move past the face-down tray delivery sensor PS11 within a specific period of time T after the face-down tray delivery sensor PS11 has detected the leading edge of the paper.
Non-Default Size Feeding Jam If the transparency sensors 1 and 2 detect a transparency not of a specific size, a non-default size feeding jam is identified.
Reversing Assembly Delay Jam The duplexing driver PCB will identify a reversing assembly delay jam if the paper does not reach the reversal paper sensor PS26 within a specific time after the duplex- ing flapper solenoid has turned on.
Jam check 1. Normal Error Reversal paper sensor. Reversing Assembly Stationary Jam The duplexing driver PCB will identify a reversing assembly stationary jam if the paper does not move past the reversal paper sensor PS26 within a specific period of time aft the duplexing flaper solenoid has turned on. Duplexing flapper solenoid drive signal T1 T1 Jam check. Reversal paper sensor Normal Error. Duplexing Feeding Assembly Delay Jam The duplexing driver PCB will identify a duplexing feeding assembly delay jam if the paper does not reach the duplexing unit paper sensor PS24 within a specific period of time after the paper has moved past the reversal paper sensor PS T2 T2 Jam check.
Duplexing unit paper sensor Normal Error. Pick-Up Assembly 6 Remove the four screws, and detach the pick-up cassette cover. If you are replacing any of the parts of the pick-up assembly, be sure to remove the pick-up roller, feeding roller, and separation roller first to avoid soiling them with grease. Further, take care not to soil the paper feeding guide with grease. If you are replacing the gears shown in Figure , be sure to apply grease to prevent abnormal noise. Use the appropriate grease SHV- 2 , and never use any that is not rec- ommended.
To apply, put a small amount size of a small bean over three or more contiguous teeth. Removing the Feeding Clutch 1 Disconnect the connector. Removing the Cassette Pick-Up 2 Remove the screw, and disengage the Solenoid two claws; then, detach the pick-up 1 Disconnect the connector. Delivery Assembly 5 Remove the two screws, and detach the delivery assembly.
Removing the Delivery Assembly 1 Perform the steps on p. Feeding Assembly D. Registration Roller Assembly 1. Removing the Feeding Assembly 1 Perform the steps on p.
Removing the Registration Roller remove the delivery assembly. Assembly 2 Remove the two screws, and remove 1 Perform the steps on p. Figure w. Removing the Registration Clutch guide and the jam guide, remove the 1 Remove the E-shaped stop ring, and four screws and disconnect the con- detach the registration clutch.
Caution: q When replacing each part of the regis- tration roller assembly, take extra care w not to touch the sensor window. Multifeeder Pick-Up gear; then, remove the spring, E- shaped stop ring, and bushing to Assembly detach the registration lower roller. Figure 10 Turn the fixing hook in the direction of the arrow; then, lift the multifeeder 8 Remove the screw, and detach the pick-up assembly together with the rod holder cover.
Multifeeder Tray Pick-Up gage the two claws; then, disconnect the connector, and detach the multi- Roller feeder pick-up assembly. Multifeeder Tray H. Removing the Multifeeder Separation Pad 1.
Removing the Cassette Pick-Up, 1 Perform the steps on p. Perform the same for the cassette 2. PCBs from the printer unit. Note: When replacing the cassette feeding roller or the cassette separation roller, be sure to replace them at the same time. Cassette 1 Last Sheet Sensor 3. Paper separated from the intermediate transfer drum is fed inside the fixing assem- bly, moved between upper and lower fixing rollers and past the fixing delivery roller to the outside of the fixing assembly.
Paper coming out of the fixing assembly is detected by the fixing delivery sensor PS Upper fixing roller PS SL2 Fixing delivery roller Lower fixing roller. The fixing temperature is monitored by the upper thermistor THU mounted on the upper fixing roller and the lower thermistor THL mounted on the lower fixing roller.
Reference: The voltage is highest in the reader unit while the scanner is moved in reverse during printing operation with the reader unit installed. As such, the fixing heater is turned off. Preventing Rush Current The printer unit uses two heaters, and rush current would be appreciative if both heaters were turned on at the same time.
Note: To reset the printer unit after a fixing heater error has been stored in the error memo- ry capacitor C , turn it off and then on after leaving it alone for 30 min or more. Detecting a Fault in the Fixing Assembly A fault in the fixing assembly is checked by the following three: 1. Fixing heater safety circuit in the power supply circuit 3. Fixing assembly error detection circuit in the power supply circuit Details follow.
Specifically, the M-PCU detects a fault in the fixing heater under any of the following conditions: a. The thermistor sensitivity is switched from the high to the lower temperature side. Caution: 1. Once this happens, turn off the power once, leave the printer unit alone for 30 min or more, and turn on the power once again to reset the printer unit.
Fixing Heater Safety Circuit on the power supply circuit; E The fixing heater safety circuit is found in the power supply assembly, and serves to check the upper and lower fixing heaters for a fault. DC control PCB. See Figure and the following text for the functions of the circuit: The fixing heater safety circuit in the power supply monitors the upper fixing roller temperature detection signal FXTHU at pin No.
When increases in the fixing tem- perature causes the output voltage of the upper thermistor to be about 1. In response, the fixing heater safety circuit causes the output of pin No.
Then, Q of the fixing assembly error detection circuit turns off to turn off Q and thereby to turn off the relay RL , cutting off the power to the upper fixing heater and the lower fixing heater. If the fixing heater safety circuit finds a fault in the lower fixing heater, The fixing heater safety circuit is in the power supply and, if an abnormal increase occurs in the fixing temperature, it cuts off the power to the upper and lower fixing heaters.
See Figure and the following text for the functions of the circuit: The fixing heater safety circuit in the power supply monitors the lower fixing roller tem- perature detection signal FXTHL at pin No. When increases in the fixing tempera- ture causes the output voltage of the upper thermistor to be about 1. Fixing Assembly Error Detection Circuit in the power supply circuit This circuit is in the power supply, and monitors the fixing assembly for an open con- dition of the thermal switch and the fixing heater for an open circuit.
Displaced Fixing Assembly E The fixing assembly error detection circuit checks to find out whether the rated volt- age of the power supply and the rated voltage of the fixing assembly match. For instance, if a V power supply and a V fixing assembly are connected, it will identify a rated voltage mismatch.
The rated voltage of the power supply is set by means of a jumper wire JP1; for a V power supply, JP1 is open, while JP1 is shorted for a V power supply.
The rated voltage of the fixing assembly, on the other hand, is set by means of a jumper wire JP2 inside the fixing assembly for a V fixing assembly, JP2 is open, while it is shorted for a V model.
Open Circuit in the Fixing Heater E At the start of temperature control, the printer unit drives the upper fixing heater and the lower fixing heater, one at a time to check the FXSTS signal for an open circuit in the fixing heaters. The fixing assembly error detection circuit detects AC current flowing through the fix- ing heater. The voltage occurring at T is monitored by pin No. As a result, the output of pin No. Construction The fixing assembly serves to fuse toner into the fibers of paper, and con- structed as shown in Figure cross sectional view.
Removing the Fixing Assembly 2 Place the fixing assembly on the guide as shown. Caution: If the duplexing unit is mounted, be sure to remove it before removing the fixing assembly. Mounting a New Fixing Assembly Figure 1 Prepare a new fixing assembly, and detach the two spacers orange. Then, shift up the the upper thermal switch. Removing the Upper Thermistor mount it. Removing the Upper Thermal the fixing cover 2. Switch 1 Disengage the two claws, and remove w the fixing cover 1. Removing the Lower Thermal Switch 1 Shift down the jam removal lever, and remove the E-shaped stop ring and the spring; then, slide the lower sepa- ration guide in the direction of the arrow to detach it from the lower sep- aration guide.
Removing the Lower Thermal the thermal switch cover. Switch 1 Perform steps 1 through 6 on p. Guide to Test Prints for the Printer Unit Troubleshooting Image Faults Error Codes Faults Not Identified by Error Codes Paper Jams Faulty Feeding Thermistors, Lamps, and Heaters. Clutches and Solenoids Fans and Motors Duplexing Unit Entering the Service Mode Menu Structure and Key Assignment Main Menu Generating the Test Page Test Pattern Printer unit A-1 D. A B. A-7 E.
A C. Oil-Free Fixing Assembly The fixing assembly is free of oil, allowing replacement without soiling hands. Quick Replacement of Toner Cartridges The Y, M, and C toner cartridges are designed as a 3-color rotary development construction so that they, including the black toner cartridge, may be replaced by the user without effort.
Auto Duplexing Mechanism The installation of a duplexing unit accessory will enable making double-sided prints through-path configuration.
Reader Unit The installation of the reader unit accessory in some areas will generate sharp prints at a resolution of dpi x lpi. Printer Unit 1. Functions Wait time 5 min or less First print time See Table Printing speed See Table Others Operating environment See p. Warning : Do not insert a screwdriver or other tools with a high reflectance into the laser path when servicing areas around the laser scanning system.
The eye, if exposed to laser light, can suffer permanent damage. Caution : This control panel is available only when the printer unit is used as a printer after equipping it with a printer board, and is not available if the printer unit is used as a copier. When entering numbers or text, increments to the previous number or character.
Hold down the button to increment rapidly. When enter- ing numbers or text, increments to the previous number or character. While printing, can- cels printing or processing the current job. When the printer is in online ready to ready mode, takes the printer offline. In setup when receiving, pro- menus, advances from one menu to cessing or printing the next.
From a setup menu option, data, and off when the returns to the previous setup menu. Blinking when the printer requires operator intervention e. Storing the Drum Cartridge and the Toner Cartridges Regardless of whether they have been opened or not, the cartridges Y, M, and C toner cartridges, black toner cartridge, and drum cartridge remain subject to the influences of the environment, and their characteristics change over time.
Before Opening the Package When storing the cartridges Y, M, and C toner cartridges, black toner cartridge, and drum cartridge in a storeroom or a workshop, be sure that the place complies with the conditions in Table ; in addition, 1 Avoid direct sunshine; 2 Avoid an area subject to appreciable vibration; and 3 Avoid subjecting them to impact by hitting or dropping.
After Opening the Package The photosensitive drum is an organic photoconductor OPC , and would deteriorate if subjected to strong light. Storage Environment after opening 1 Keep it in a protective bag. Service Life The service life of a cartridge is 2. Toner detecting windows Figure 9 Do not touch the protection shutter of the toner cartridge. The photosensitive drum consists of a photoconducting layer organic photosensitive conductor, OPC on the outside and an aluminum base conductor on the inside.
The printer unit forms images as follows: A color original is exposed to light, and the light reflected by the original is separated into three primary colors for detection by a CCD. Latent Static Image Formation 4. Development Block 5. Photosensitive Drum Cleaning Step 4: development Block 3.
Transfer Block Step drum cleaning 6. Fixing Block Step 5: primary transfer Step 6: secondary pre-transfer Step fixing charging Step 7: secondary transfer Step 8: separation Latent static image formation 2. Primary charging Delivery 1. Pre-exposure 3.
Laser beam exposure. Development Drum cleaning Photosensitive drum ITD cleaning cleaning block 5. Primary transfer 6. Secondary pre-transfer charging Transfer block 8. Separation 7. Secondary transfer Registration Multifeeder Cassette Flow of print paper Rotation of the photosensitive drum Rotation of the intermediate transfer drum. Latent Static Image Formation Block This block consists of three steps, performed to generate a latent static image on the photosensitive drum. Primary charging roller Photosensitive drum AC bias DC bias Figure Step 3 laser beam exposure When a laser beam is directed to the photosensitive drum, the charges in its light area become neutralized, turning the area into a latent static image.
Development Block In this block, toner is deposited on the latent static image on the surface of the photosensitive drum, thereby turning it into a visible image. Transfer Block In this block, the toner image on the surface of the photosensitive drum is transferred to paper by way of the intermediate transfer drum. Step 5 primary transfer The intermediate transfer drum is charged to positive potential from its inside to move the toner from the surface of the photosensitive drum to the intermediate transfer drum.
This process is repeated for each color Y, M, C, Bk in sequence. Photosensitive Drum Cleaning In the primary transfer step, not all toner on the photosensitive drum is transferred to the intermediate transfer drum, but some remains on the drum.
Step 11 photosensitive drum cleaning In this step, the residual toner on the drum surface is scraped off by a cleaning blade in preparation for the next printing run.
0コメント