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Controlling the Main Motor to a Specific Speed The machine's main motor is subjected to constant speed control, ensuring that it rotates at a specific speed. The driver PCB controls the motor in such a way that the frequency of the clock pulses occurring as a result of the rotation of the motor and that of the reference pulse signal from the main motor PCB will match.
Detecting Errors E If a fluctuation occurs in the rotation of the main motor for some reason, the signal used to indicate rotation at a specific speed M1LCK goes '0'; the condition will be identified as a main motor error and, as a result, all operations will be stopped and 'E' will be indicated on the control panel.
Original size DSZ0 sensor 0. Image processor PBC. The light-blocking plate is at PS4. Multifeeder paper Detects the width of copy paper width detection placed on the multifeeder. B2 MTPW analog signal. Drum ambient -B2 analog signal temperature sensor.
J -A13 -A Environment sensor -A15 -A16 -A TH2 -A9 See I. PS18 Q J28 J -1 -2 -3 Scanner motor M3 -4 J49 JB1 24VU. J40 JB7 24VU. See II. Outline The machine's original exposure system consists of the following: Scanning lamp No.
Image System motherboard processor PCB. Laser exposure system Photosensitive drum. The scanner motor is a stepping motor, and is controlled by the image processor PCB.
The position of the No. Outline The scanning lamp is a fluorescent lamp, and is turned on and off by the composite power supply PCB using the control signals from the image processor PCB. The PCB has the following functions: J Error detection signal J JJ J J J Controlling the Pre-Heating Mechanism The filament of the scanning lamp is kept powered so that the intensity of the scanning lamp will attain an optimum level in a short time after the Copy Start key is pressed pre-heating.
The pre-heating state may be either full-preheating or lamp pre-heating. Full Pre-Heating About 4. Lamp Pre-Heating About 3. A lamp activation voltage is applied to the scanning lamp in response to the signal. Controlling the Intensity The intensity control signal is a pulse signal, and the intensity of the scanning lamp is varied by changing the duty ratio of the signal.
The output value of the scanning lamp intensity sensor is sent to the image processor PCB on a periodical basis for monitoring and maintaining the intensity at a specific level. At the same time, an error code will be indicated on the control panel. E The scanning lamp turned on in standby state. The scanning lamp turned off during a copying run.
E The intensity of the scanning lamp fails to attain an optimum level. Identifying the Size by the Paper Sensors 1 The paper sensors are arranged under the copyboard glass Figure to identify the size of an original placed on the copyboard glass. Paper sensor 0 Paper sensor 1 Paper sensor 0 Paper sensor 1.
For 15 sec or until the Copy Start key is pressed after PS2 has turned on, the output level of each sensor is read at 0. The machine will identify the presence of an original at the sensor if its output level remains the same, and will then identify the size of the original according to specific combinations of sensor states Tables , This way of identification enables the use of dark originals.
The output level of each sensor, however, will not change under the conditions a or b below; in the case of c, A3 paper will be selected first if the appropriate cassette is absent, the standard mode cassette will be selected.
An A3 dark original is used. A book original is used. The thickness of a book prevents the copyboard cover from closing enough, not changing the output levels of the sensors.
The copyboard cover is not closed. PS2 remains off. In the case of a, b, or c, the size of the original may be identified wrongly. Copyboard cover Original 30 PS2: ON PS2: OFF Copyboard glass. No change Change in Paper sensor 1 Paper sensor 2 in the level the level. Identifying the Size by the Paper Sensors 2 The image processor PCB identifies the size of an original based on the combination of sensor states: In the table, "No" means th at the output level of the sensor did not change when it was read at intervals of 0.
In the table, "Yes" means that the output level changed when it was read at intervals of 0. As such, identification occurs as soon as an original is picked up, and is effective for the following default sizes: B5, B5R, B4 Inch-configuration: The mounting screws used for the grounding wire and varistors are equipped with toothed washer to ensure electrical conductivity. Be sure to use the washers during assembly work.
Scanning System 3 Remove the four screws, and detach the rear cover. Removing the Scanning Lamp 4 Remove the feeder unit or the copyboard cover; then, remove the two screws, and Caution: Do not start working if the scanning 5 Disengage the two hooks , and lamp is hot.
Do not leave fingerprints on the scanner cooling fan. If the surface of the scanning lamp is soiled, dry wipe it. Scanner Drive Assembly The scanning lamp has its own orientation. Keep the following in mid 1. Removing the Scanner Drive Motor when mounting it: Keep the side with the manufacturer's 2 Remove the rear cover and the rear upper name to the rear. Keep the transparent side to the 3 Remove the flywheel.
Do not touch the transparent section. Figure Figure Removing the Scanner Cable 1 Remove the following: You will need the following tools for routing the scanner cable: Mirror mounting tool FY 2.
Pulley clock FY Perform the following in the order indicated: Loosen the set screws to free the pulley. Set screws . Steel ball. Fitting the Mirror Positioning Tool Use the mirror positioning tool FY by changing its pin arrangement as shown below. Note that    in the figures indicate the locations of the pins, while [A] [B] [C] indicate the pins. Note that pin [A] of the mirror positioning tool FY will not be used for the machine.
Adjusting the Mirror Position optical length between No. The same applies to the rear side plate. Various correction and processing are performed in the following PCBs, each sending resulting image signals to the next PCB.
Printer Motherboard. Printer Board. The signals photo-converted by the light-receiving unit are transferred to the analog signal processing block odd- and even-numbered pixels are communicated separately. J Clock pulse generation. J Analog signal processing block. AE Processing ABC processing The machine's AE auto density adjustment mechanism processes image data on a line-by- line, real time basis each single line in main scanning direction; it does not measure the density of an original by pre-scanning.
White background original Colored background original The ABC circuit processes the reference original surface voltage to reduce the FFH white level, i. Dynamic range of a white background original. Dynamic range of a colored background original. Adjustments will vary the density correction curve; a lower setting will make the text darker.
Higher Lower setting setting. Black Original density Black White. Increases or decreases in the reference voltage will in turn increase or decrease the dynamic range difference between maximum output level and minimum output level. Analog Signal Processing Block The analog signal processing block performs the following: Outline The digital image processing block processes image signals from the analog image processing block or from the various extension boards.
Figure is a block diagram showing the items of processing. In the case of making a single copy a single copy from a signal original , the image data is converted to dpi equivalent images by smoothing after binary processing, and is sent to the laser driver PCB direct copying. In other cases, image data is stored in memory first and then transferred to the laser driver PCB memory copying.
Analog image processing block x dpi. Digital image processing Image processor PCB. Image synthesis Density processing overlay processing. Shading Correction The output of the CCD does not necessarily match the light reflected by an original although the original may have an even density for the following reasons: The sensitivity differs from one pixel of the CCD to another.
The degree of lens transmission is different between middle and edges. The scanning lamp deteriorates. The resulting variations are corrected by means of shading: In shading auto correction, the density of the white standard plate and white paper is measured by the CCD PC , and the collected data is stored in memory. The data is then subjected to computation, and the result will be used as the "target value" at time of shading correction. Shading Correction Shading correction is executed for each scan of an original.
The light of the scanning lamp is directed to the standard white plate Figure , and the light reflected by the plate is converted into digital signals by the CCD PCB.
The resulting digital signals are sent to the shading circuit on the image processor PCB as shading data.
The shading circuit compares the shading data against the target value stored in memory, and sets the difference as the shading correction value. The shading correction value is used to correct the variation among the pixels of the CCD occurring during scanning operation, thereby evening out the image density level. Scanning lamp Characteristic after correction No. Standard white plate Original density. Total Processing The total processing block performs the following: Image Composition In image composition, n originals are placed on a single sheet.
The mode may be either of the following: The images will be laid out as follows according to the selected mode, original size, and copy size:. A4 A4 1. Feeding direction 1 2 1 2 Originals A4R.
Originals A4R. A4 A4 4. In book mode, all image data is The original is scanned. The Copy Start key must be pressed for a second time.
Shift The images are laid out in the page memory for printing. A copy is generated. Varies according to the type of layout selected on the control panel. If the lengthwise ratio and the breadthwise ratio are different, the smaller of the two will be selected. Density Processing 1. Outline Density processing takes place differently between direct copying and memory copying; i. The flow of processing will be as follows:.
Original scan Copy Start key ON Multiple-value data Original scan Density processing density correction curve Multiple-value data Multiple-value data Density processing density correction curve Binary processing Multiple-value data for image output. Binary data Binary processing from image memory read.
Laser exposure Binary data.
Output end Binary data. Laser exposure Laser output and Image developing bias varied density fine a djustment Development. When reading an image, digital processing may take place using a density correction curve for handling multiple-value data; however, since binary data is used when generating output in memory copying not having density information , the laser intensity and the developing bias are varied for the reproduction of density as if in analog mode.
Density Correction Curve The density correction curve for density processing varies according to the following: Photosensitive Drum Resistance The surface coating of the photosensitive drum tends to become worn over time, causing its photosensitive medium to become thinner and, ultimately, affecting its charging characteristics. To ensure the production of stable image, the resistance is measured and the density correction curve is varied according to the result of measurement.
Application current values are sampled while charging takes place to compute the resistance of the photosensitive drum. The resistance is checked at such times as shown below: Coating is thin.
Coating is thick. Density Original density correction curve. Density Correction for Memory Copying When generating output during memory copying, binary image data stored in the image memory is processed, not allowing the use of a density correction curve for density processing and, instead, requiring variation of the developing bias for the laser intensity. Laser intensity small Laser intensity large.
The copy density is reduced images made lighter by decreasing the developing bias. An excessive decrease, however, will make the images fuzzy, and the laser intensity is deceased instead to avoid the problem.
Binary Processing The image data read by the scanner is turned into binary data after density processing with a density correction curve. In the case of fax output, resolution conversion takes place, requiring a different method of binary processing. Different binary processing methods are also used for different image modes text, photo. Step 1 The average of the densities of the adjacent pixels is computed to determine a slice level, and the pixel in question is identified as "black" if its density is higher than the slice level and "white" if otherwise.
The pixel in question tends to be black if it is surrounded by dark pixels, and tends to be white if otherwise. The degree of probability, further, also varies according to the density data of the pixel in question. The pixel in question tends to be The pixel in question tends to be white since it is surrounded black since it is surrounded by white pixels. Pixel in Pixel in question question.
Step 2 The binary image data is then subjected to smoothing, thereby increasing the initial resolution of x dpi to x equivalent. Binary Processing photo mode In photo mode, image data is subjected to screen processing, enabling gradations while still using binary image data. The flow of processing is as shown in Figure As many as 4 x 8 pixels are treated as a single unit, and pixels are distributed into patterns according to the mode of density distribution.
Fax Reception Fax Reception.
Image data received from the telephone line Image data read from scanner. Image memory Image memory non-compression Method of compression used Printing by the other party identified by communication Compression. Image memory. Image Memory The machine is equipped with an image memory, and image data is stored in it memory copying except when making one copy of one original direct copying. The image memory consists of a page storage area, in which compressed image data is stored on a page-by-page basis, and a work area, in which images read by the scanner is stored temporarily for rotation or compressed data after processing is stored temporarily.
Page memory for printing non-compression Image memory. Shared memory Memory for reading non-compression for copier. The increased area will be used as common memory for page storage. Image memory 1 Image memory 2 for expansion for expansion. Installation of memories must be in a specific sequence: Overlay Copying The machine uses its image memory for overlay processing, and the flow of processing is as follows:. The steps used to disassemble the parts must be reversed when assembling them, unless otherwise noted.
The washer used with a specific mounting screw e. CCD Unit 5 Remove the grounding wire , disconnect the two connectors , and 1. Removing the CCD Unit remove the cable . CCD unit cover .
Particularly, never remove the screws Figure  indicated in Figure Do not forget to disconnect the 3 Remove the screw of the original size connector . Figure 4 Remove the four screws , and detach 8 Remove the seven screws  of the P the IP cover  small window. Such would hinder correct BD detection. At 1 Turn off the main power switch. The laser beam generated by the laser unit is directed to the polygon mirror rotating at a specific speed.
The laser beam is reflected by the polygon mirror, and then led to the photosensitive drum by way of the laser mirror. SCSI No. Laser drive signal Laser scanner motor drive signal. Photosensitive drum. It uses the result of measurement to vary the laser emission timing determined in reference to the BD signal so as to ensure that a specific image is always in a specific position of copy paper. Polygon mirror 8-facet. BD mirror Photosensitive drum. Copy paper shifted to the rear. Horizontal registration sensor Image area Horizontal registration sensor detecting copy paper shifted to the rear.
The flow of signals is as shown in Figure The image signals from the CCD is written to the memory for horizontal synchronization, and the image signals are read in conjunction with the clock signals for transfer to the laser driver PCB. Outline Figure shows the laser driver PCB, which drives the laser semiconductor using control signals and the image signals from the image processor PCB. The circuit has the following functions: Driving the laser semiconductor 2. Stabilizing the laser intensity APC control 3.
Switching laser activation mode 4. Switching laser output The image signals from the image processor are written in the line memory in conjunction with the sync signals generated for internal use on the laser driver PCB.
The laser drive signals are generated based on these image signals to drive the laser semiconductor. Laser power control 5V Target voltage. PD Q D Sample voltage APC control. Stabilizing the Laser Output The laser output tends to vary appreciably in response to changes in the ambient temperature. The machine controls the mechanism so as to ensure stable output:. The sample voltage is compared against the target voltage to determine the laser drive current.
The laser beam is monitored for every line scan , and the drive current is varied on a real time basis to ensure a stable laser beam. Switching the Laser Activation Mode The laser beam is turned on for control of image signals and, in addition, for detection of BD signals full activation , selected using the laser activation mode switching signal serial communication from the image processor PCB.
Switching the Laser Output The laser output may be either high or low, and control is made so that images appropriate to either mode may be obtained. The output modes are switched by changing the target voltage under APC control in response to the laser output switching signal serial communication. These laser outputs are used as shown in Table Laser output Mode Low When low density is selected for memory copying. High Other than above. Laser output low Laser output high Developing DC bias.
Lighter -2 -1 0 1 2 Darker Copy density [Memory Copying]. When the rotation speed of the motor deviates from a specific value, the motor clock signal goes '1'.
Turning Off the Laser Scanner Motor The laser scanner motor turns off when the period of time selected in "silent mode" in user mode expires. The period represents the time between the end of LSTR and the time when the laser scanner turns off [B] of Figure May be changed in user mode silent mod ; between 0 and 9; if set to 0, the period will be omitted. Laser Scanner Assembly Caution: After mounting the laser scanner unit, 1.
Outline Figure shows the construction of the image formation system. Each high-voltage mechanism is controlled by the high-voltage transformer circuit on the composite power supply PCB based on the control signals from the image processor PCB for the following items: Composite power supply PCB. Image processor PCB Control signal. High-voltage transformer circuit Humidity Primary charging roller sensor Temperature sensor Developing assembly Resistance Upper Photosensitive fixing roller drum Transfer guide.
Transfer charging roller Separation static eliminator. Controlling the Primary Charging Roller Bias 1. Outline The machine uses a charging roller for direct charging.
In addition to the DC bias, and AC bias is applied to the primary charging roller to ensure stable charging. The control items include the following: APVC measurement value. Measurement value Measurement value. The AC bias ON signal by serial communication is generated. The AC bias current is compared against the reference value, and the AC control signal is varied as necessary to drive the transformer.
Correcting the DC Bias Temperature As the temperature inside the machine increases, the resistance of the photosensitive drum drops to decrease charging characteristics.
To ensure stable potential, the DC bias is corrected according to changes in temperature. The temperature inside the machine is monitored by the thermistor mounted on the rear side plate, and the absolute value of the DC bias is increased when increases are noted in the temperature reading.
In a low-humidity environment, the charging efficiency drops to cause uneven charging, requiring maintenance of the current at a higher level. The AC bias is varied as shown in Figure 6- according to the reading of the humidity sensor. Over time, the resistance of the drum surface drops to allow more current; the current is decreased in such cases. Counter reading 0 to sheets Counter reading sheets and more. Correcting the Application Voltage Level APVC control The primary charging efficiency varies according to changes in the site environment temperature, humidity and deterioration of the charging roller.
A reference current is applied when the main power switch is turned on to find out the degree of voltage output for correction a follows:. A reference voltage is applied during initial rotation after main power switch is turned on. Controlling the Output Mode To prevent stray toner in non-image areas in continuous copying, both AC bias and DC bias outputs are varied between image areas and non-image areas.
Be sure to enter the value indicated on the service label if you have replaced the image processor PCB or initialized the RAM. Controlling the Transfer Charging Roller Bias 1. Outline The machine uses a charging roller for direct transfer. A DC bias is applied to the transfer charging roller, and the mechanism is controlled for the following: Measurement value.
Controlling the Output The DC bias output applied to the transfer charging roller is controlled as follows: The "optimum" transfer bias level differs depending on paper size and the environment, and the IP-CPU execute automatic control of the output level to suit the selected paper size and the environment.
Correcting the Application Voltage Level ATVC control The transfer charging efficiency varied according to changes in humidity or deterioration of the transfer roller. A reference current is applied each time the Copy Start key is pressed to measure the degree of voltage output for correction as follows:.
Controlling the Output Mode a. Types of Modes The transfer charging output takes the following output modes, each with a different output and switched based on the combination of transfer output mode signals from the image processor PCB. See Figure for the timing of application. It is applied each time the Copy Start key is pressed, thereby correcting the voltage level. Turning On and Off the Cleaning Bias When the cleaning bias output signal of the composite power supply PCB goes '1', the output from the main transformer is applied to the transfer charging roller.
Controlling the Separation Static Eliminator Bias 1. Outline The machine uses a static eliminator for separation, and a DC bias is applied to the static eliminator. The mechanism is subjected to the following: Photosensitive AC power supply voltage input drum. High-voltage Separation static Transfer drive main transformer eliminator signal. Turning On and Off the Separation Static Eliminator The separation static eliminator bias is turned on and off as follows:.
The output from the high-voltage main transformer is applied to the separation static eliminator. Constant Voltage Control The bias output is returned to the output control circuit to maintain a specific voltage. To ensure proper separation, the application voltage is increased from the normal The selection of an application voltage is made by the separation bias mode signal serial communication from the image processor PCB.
Does not change the application voltage. Changes the application voltage to Controlling the Transfer Guide 1. Transfer Guide Bias The transfer guide bias is used to prevent adhesion of toner to the transfer guide, and is negative in polarity VDC; toner is also charged to negative polarity.
The transfer guide bias is applied as soon as the control panel power switch is turned on, and continued until power is removed.
Serial communication Transformer drive signal. Primary Charging Roller Cleaning Mechanism 1. Outline The machine is equipped with a mechanism which automatically cleans the primary charging roller. The primary charging roller is cleaned by turning on the primary charging roller cleaning solenoid SL4 , thereby butting the cleaning pad against the primary charging roller and, at the same time, moving it across the length of the roller.
Cleaning is performed for the following: In this case, cleaning is performed while applying a cleaning bias to the transfer charging roller. Primary charging roller Cleaning pad. Outline The developing assembly consists of the developing cylinder, toner sensor TS1 , and toner stirring rod. The developing assembly is locked in position manually by operting the locking lever together with the developing assembly rail. The developing cylinder and the toner rod are rotated by the drive of the main motor M1.
Toner stirring rods. Toner sensor TS1 Composite power. Developing Image processor PCB. Controlling the Developing Bias 1. The output is controlled by the composite power supply PCB according to control signals from the image processor PC for the following: An AC component is added to the developing bias DC component, and the result is applied: The pulse width of the DC control signal is varied as necessary according to the return voltage.
Controlling the Level of the Developing Bias DC Component 1 In memory copying, the laser is driven based on binary image data, which does not have density information, preventing adjustment with a density correction curve for output images.
As such, the density of images during memory copying is adjusted by varying the developing bias DC component. Be sure to enter the value indicated on the service label if you have replaced the composite power supply PCB. Controlling the Level of the Developing Bias DC Component 2 The level of the developing bias DC component is switched between image areas and non- image areas to prevent stray toner inside the machine.
Controlling Toner Level Detection A toner sensor of a piezoelectric oscillation type TS1 is mounted inside the developing assembly to monitor the level of toner. When toner exists inside the developing assembly, the output of the toner sensor goes '1'; when the level of toner drops below a specific value, the output will go '0'. It then computes the 0's most recent two cases of the toner sensor output, and indicates the Add Toner message in the touch panel as needed.
Outline The drum cleaner consists of the cleaning blade, waste toner sensor PS14 , and waste toner feeding blade.
The waste toner scarped off the drum is moved to the rear of the cleaner case by the feeding blade, which is driven by the main motor. The waste toner case is monitored by the waste toner sensor PS Detecting Waste Toner The coupling shown in Figure is butted against the blade drive mechanism by the force of a spring, thereby transmitting the drive of the main motor to rotate the blade.
When the cleaner case becomes full of waste toner, the rotation of the waste toner feeding blade starts to drag, causing the coupling to move back and forth in axial direction and pushing the waste toner sensor lever and, as a result, turning on and off the waste toner sensor PS14 repeatedly. The machine assumes that the waste toner case is full under the following conditions, and will indicate the Waste Toner Case Full message while in standby state: Waste toner sensor PS Main motor Cleaning case Coupling M1.
Drum Unit 2. Cleaning If the surface of the photosensitive drum 1. Removing the Drum Unit is soiled, wipe it with a flannel cloth coated 1 Open the front door. Do not use paper, lint-free or 2 Release the feeding assembly. Do not dry wipe, or do not use solvent. Do not use cleaning powder. When Replacing the Drum Unit When replacing the drum unit, fill out the  label figure with the date and the counter reading; attach the label to the front cover of the new drum unit, and perform the Image Adjustment Basic Procedure.
Zahler note Notiz.
Take care not to damage he photosensitive Figure drum. The photosensitive drum is extremely After replacing the drum unit, be sure to sensitive to light. Exposure to room clean the fixing separation claws upper, light can lead to white spots or black lower.
Transfer Charging Roller C. Drum Sensor Unit 1 Open the front door, and release the 1 Remove the drum unit. Do not touch the surface  of the transfer roller; otherwise, image faults can occur. Magnet Plate 2. Drum Sensor Unit Magnet Plate Primary Charging Roller E. Primary Charging Roller Cleaning Mechanism Developing Assembly Delivery Assembly Detecting Jams Sequence of Operations II.
Pick-Up Assembly Operation in Standby State. Detecting the Level of Paper.. Feeding Assembly Identifying the Size of Paper.. Lower Feeding Assembly Registration Roller Assembly Controlling the Registration F. Lower Feeding Motor Making Overlay Copies Pick-Up Drive Assembly Vertical Path Assembly Inputs to and Outputs from A. External Covers Detecting Paper Paper Deck Deck Lifter Drive System Feeding System Electrical System Controlling the Deck Motor. Fixing Assembly Fixing Drive Assembly Fixing Cleaner Assembly Controlling the Fixing C.
Fixing Assembly Inlet Temperature Protective Mechanism for the D. Fixing Cleaning Belt E. Upper Fixing Roll Bias Operations of Counters Removing the Front A. Arrangement and Functions.. Detecting Errors E Composite Power Supply A.
Low-Voltage Power Supply B. Handling the Laser Unit External view Safety of Toner Cross Section Turning On the Power Main Motor M1 Control A. Functional Construction Outline of the Electrical E. Inputs to and Outputs from Circuitry Sequence of Operations Sequence of Operations A.
Identifying the Size by the II. Identifying the Size by the B. Turning On and Off the V. Scanning System Controlling the Intensity Scanner Drive Assembly Detecting Errors Shading Correction Total Processing Density Processing Binary Processing AE Processing F. Image Memory Overlay Copying Analog Signal Processing A. CCD Unit IP PCB Outline of Operations Turning On and Off the Laser B. Stabilizing the Laser Output Switching the Laser Activation V. Laser Scanner Assembly Switching the Laser Output Controlling Toner Level B.
Controlling the Primary III. Controlling the Transfer B. Detecting Waste Toner Controlling the Separation A. Drum Unit Transfer Charging Roller Controlling the Transfer C. Drum Sensor Unit