Article Navigation Chapter Chapter 1 Copier Work Principle Electrostatic Principles Optical Imaging Principle Semiconductor Principle Chapter Chapter 2 Copier Working Procedure Chapter IV Chapter 4 Copier Electrical Structure Chapter 5 Copier Adjustment 1, Mechanical Adjustment II, Image , Electrical Adjustment Chapter 6, Copying Machine, Auto Diagnostics, II, Fault Code Self-diagnosis Chapter 7 Copier Common Faults and Exemptions, Parts and Control Faults II, Image Quality Fault Copy Machine Common Fault and Exclude (Continued one) Common faults and exclude (continued 2) Common faults and exclusion of copiers (continued 3) Common faults and exclusion (continued)
Chapter 1 Working Principle
The working principle of the copier mainly includes the following three basic principles:
Electrostatic principle
The charge is positive and negative two poles, and the so-called electrostatic principle refers to the implantation of the same charge; anisotropic charge is attracted to each other. The so-called same sex, isotropic. Figure -1
Optical imaging principle
Basic knowledge of optical imaging: The object is imaged by an optical lens. Figure 2
Semiconductor principle
The semiconductor principle is an insulator when static, or a reverse voltage; and the flavor is added to the voltage to the voltage.
The photosensitive drum material for the copying machine is a photosensitive semiconductor: that is, when the darkness (not light) is an insulator; the conductor is conducted during the brightness (light). Figure 3 shows.
Summary: The working principle of the copier is to use the potential characteristics of the photoconductor, and the photoconductor is charged without being illuminated, so that the surface of the surface is uniform, and then the original image is imaged in the light guide. The image portion is not received by the illumination (equivalent to a dark state), so the surface of the optical conductor is still charged, and the imageless region is subjected to a light (equivalent to a bright state), so the charge of the surface of the optical conductor passes through the ground of the substrate, so that the surface The charge disappears, thereby forming an electrostatic latent image. After another, the electrostatic latent image with polar opposite charge is used to convert the electrostatic latent image of the optical conductor to the toner image of the surface of the photoconductor. Finally, the toner image of the optical conductor surface is still transferred to the surface of the copy paper to complete the basic process of the photoconductor surface.
Chapter II Working Process
The working process of the copier and the components are shown below:
The working process of the copier mainly includes the following parts: (according to copy order)
The charging member (high pressure generator, electrode frame, motor wire) makes the photosensitive drum surface uniformly with charge.
The exposure member (scanning exposure lamp, mirror, lens) enables the photosensitive drum surface to form an inversion potential latent image of the image. (The previous sector has explained)
The developing component (developer, high pressure generator) converts the potential latent image of the photosensitive drum surface into a toner image. (The previous sector has explained)
Paper feed components (motor, pickup wheel) motor drive the pickup wheel to transfer the paper feed into the machine, and transfer the toner image of the drum surface to the paper for the next step.
The transfer member (high pressure generator, electrode shelf, motor wire) passes the charge of the photodetead of the toner charge on the surface of the toner charge by the transfer electrode to transfer the toner image on the photosensitive drum to the copy paper.
Separation components (high pressure generators, electrode frames, motor wires) Since both the copy paper and the photosensitive drum surface are charged, and the polarity is inverted, the copy paper is not easily separated from the photosensitive drum during the copying process. Therefore, the copy paper that completes the copy is to be separated from the drum, and the separation measures are required. The previous photocopier adopts mechanical separation, but easy to jam; the current copier uses current separation. The separation current contains high frequency AC and fixed DC components.
Cleaning Parts (Cleaner) Clean the residual toner on the surface of the drum, and make it ready for the next copy. All copiers are not likely to be transferred to the copy paper by transferring the toner of the photosensitive drum surface. Therefore, there is a residual quet powder, which is not cleaned, affects the quality of the photocopy. The toner image of the fixing member (fixing hotch stick, pressure stick, heater) copy paper is fixed to the copy paper by fixing. If the fixing is not fixed, the image on the copy paper is dropped. (So fixing a certain temperature and pressure required)
The process of the copier also includes many auxiliary processes, mainly: the power consumption component (full exposure lamp) clears the residual potential of the photosensitive drum surface to prepare for future copying. Otherwise, the copy will have residual images or bottom ash. The copying member (like the like edge mining lamp) has a front end, a front rear side, a rear end, or a blank portion of the portion, so it is necessary to remove the surface potential of the unwanted photosensitive drum by the image side consolidation lamp.
Chapter III Mechanical Structure
The mechanical structure of the copier is shown in the figure below:
The copier mechanical structure mainly includes the following parts:
The optical imaging system is mainly composed of an exposure lamp, a mirror (1 ~ 6 or 1 ~ 4), and the optical lens. The role is to imaging the original to the photosensitive drum, so the imaging quality of the optical system directly affects the quality of the photocopy. Clean maintenance and precautions of the optical system will explain in detail in the following sections.
The photosensitive drums and imaging systems are mainly composed of a photosensitive drum, a charging electrode, a transfer electrode, a separation electrode, and an image-like side console lamp and a full console lamp. It is to convert the optical image of the optical imaging system in the surface of the photosensitive drum into a potential pressure; then transfer the toner image on the photosensitive drum to the copy paper; then copy the copy paper from the photosensitive drum to complete the original The process of the copy.
The developing system is mainly composed of a powder powder motor, a toner cartridge, a developing magnetic pool, a magnetic pole blade, a toner mixer, a toner, and a drive gear. Its action is to add powder motor to feed the toner in the toner cartridge into the developer by toner delivery, and then the toner mixer sufficiently stirred the toner to adsorb the toner tape to the developing magnetic rod The thickness of the toner on the magnetic rod is controlled by the magnetic pole blade. Finally, the toner surface of the magnetic stick surface is adsorbed onto the photosensitive drum on the photosensitive drum image through the charge of the photosensitive drum surface.
The paper feed system is mainly composed of paper feed motor, pickup wheel, carton, drive gear. Its role is to transfer the print paper feed into the machine, and transfer the toner image of the drum surface to the paper for the next step.
The cleaning system consists mainly of cleaning blade, recovery stick, waste powder transmission spiral rod, waste toner, transmission gear. Its function is to clean the blade to scrape the residual ink of the photosensitive drum, and then collect the waste powder to the waste powder box by recycling the stick, the waste powder drive spiral. Because all copiers are not possible to completely transfer the toner of the photosensitive drum onto the copy paper by transfer. Therefore, there is a residual toner, which is not cleaned, affecting the quality of the photocopying.
The fixing system is mainly composed of a fixing hotch, a stress stick, a heating tube, a thermistor, a superheated protection switch, and a transmission gear. The role is to heat the hotch to a certain temperature by heating the lamp tube, which is controlled by the thermistor. Then use the pressure between the warmth stick and the pressure stick to melt the toner on the copy paper and fixed to the copy paper.
The transmission system is mainly composed of a main motor, a scanning lamp holder motor, a lens motor, a paper feed motor, and a developing motor (no after two copiers), transmission gears, transmission chains (belts or wire ropes). The main motor drives the drum, the paper feed mechanism, the cleaner, the fixing, the developer, and the paper feed mechanism (some models are driven by separate motor); the lens motor control lens moves before and after different ratios, to ensure copy effect; lamp stand The motor drives the movement and retreat of the lamp stand, but also guarantees the movement of the light stand and the rotation of the photosensitive drum (how to implement the following chapters detailed explanation); send paper motor to drive the pulley to feed the paper into the machine; developed motor Then the rotation of the developer is driven, and the toner is simultaneously delivered to the magnetic pool (how, why is it detailing the sections of the synchronization? The paper feed system is mainly composed of paperpad sticks, paper feed wheels, paper feed belts, branches, paper panels. The copy paper is sent to the copier to the copying machine to the fixing, in addition to paper, transfer, transfer, other auxiliary processes, while the paper feed system is an essential transmission of the copy paper in the copier. section. Of course, it also involves the positioning, synchronization problem of the copy paper, and is also discussed in the back electrical chapters.
Chapter IV Electrical Structure of the Copier
The electrical system of the copier mainly includes the following parts:
The power supply is mainly composed of power cord, switch, and AC to DC conversion switching power supply. The function of the switching power supply is to convert the external AC power supply provided by the power cord to the DC power supply required by the copying machine control section, and the DC power source generally uses the output of multiple sets of different potentials (common 24V, 12V, 5V).
24V - Provides power supply for output components such as sensors, motors, electromagnetic clutches;
12V - Provide power supply for components such as control panels;
5V - diodes, control panels, sensors, etc.
The control portion is mainly composed of a main control board, an exposure lamp control board, a motor control board.
The main control panel controls the entire copy process of the copier.
The exposure lamp control panel controls the illumination intensity of the exposure lamp according to different concentrations of the original.
The motor control panel controls the scanning lamp holder, the position of the lens, and the forward rear return speed according to different copy magnification (some models are integrated within the main control board).
High-pressure partial high voltage generator provides high pressure required for charging, transfer, separation, development bias, gate bias, disintegrating, and pre-transfer (no models) required for the copy process according to the instruction of the main control board.
Display some of the main components is the operator panel.
The automatic test portion is mainly composed of an automatic concentration sensor, an original size sensor.
Automatic exposure automatic concentration sensor detects different original concentrations to obtain different potential transfer to the main control board, and then the main control board gives different instructions different from the exposure light control board, and controls the light-emitting intensity of the exposure lamp to achieve the best copy effect.
Automatic selection paper and multiplier original size sensor detects different original size sizes to obtain different combinations to the main control board, and then the main control board is selected according to different combinations: 1. Select the same paper as the original size according to the selected magnification; 2 Select the appropriate magnification based on the selected copy paper size.
The sensor portion is mainly composed of a scanning lamp rack original position sensor, a lens raw position sensor, a paper sensor, a relative sensor, a paper-free sensor, a paperless sensor, a paper size sensor, and the like.
Chapter 5 Adjustment of Copier
The adjustment of the copier adjustment and image, electrical adjustment two parts
I. Mechanical adjustment: The adjustment of the optical system adjustment optical system is: the adjustment of the distance between the full scanning light stand and the semi-scanning lamp holder (other tuning angle of the mirror is strongly recommended). This adjustment is generally adjusted under the following cases: replacing the scanning lamp wire rope; there is a magnification difference between the photocopy and the original; Different models of copying machines are different, and the specific model adjustment is subject to the maintenance manual of the model! The development of the developer magnetic ear is adjusted that the magnetic height of the developer will change with the aging of the magnetic stick, and the height of the magnetic stick blade is high, and the high and low of the magnetic ear can affect the quality of the photocopy. Different models of copying machines are different, and the specific model adjustment is subject to the maintenance manual of the model! The fixator pressure adjustment fixing pressure requires the quality of the copy of the copy to be guaranteed, too large, easy to cause copying paper wrinkles; too small, easy to fix it. The fixative pressure adjustment needs to be adjusted in the following cases: The copy is not old, the content is removed; the copy paper has wrinkles, the copy is not flat.
The test of the fixator pressure is as follows: The copier is copied in the normal operation of the A3 full black version, and the fixture is turned off immediately, let the copy paper stay in the machine for about 15 seconds to remove the copy paper, the effect is as shown below Show:
Size width B 4.0 ± 0.5mm | A-C | 0.5mm or less
Adjustment standards such as above
Second, image, electrical adjustment:
Optical image adjustment optical image adjustment is mainly: image front end blank, image alignment, image deletion, image magnification, exposure light brightness adjustment. Image front end blank adjustment: The front end of the photocopy is to prevent paper jams, so the front end is blank must, but there is a certain range, the general copier is 1.5 ± 0.5 mm. Image pair adjustment: The pair of copiers refers to the synchronization of the copy paper and the photosensitive drum, which can be adjusted to make the copy paper in advance or lag, from the front end of the photocopy to the front end of the photocopy. Image of the deletion: This adjustment mainly allows both the images of the two side of the copy to complete; if the colored copier, for two or more colors, the printed or overlap is not generated. Image multiplier adjustment: fine tuning lens or mirror position, allows the copy of the copy to the standard (some models do not have this adjustment). Exposure Light Brightness Adjustment: When the exposure light and the drum are aging, the satisfactory copy effect can be obtained by adjusting the brightness of the exposure lamp. Electrical adjustment electrical adjustment is mainly: electrode filament height, charging potential is high, and the development bias is adjusted. Electrode filament height adjustment: The high adjustment should be performed after replacing the electrode, although each model is different, but the requirements cannot be too close to the photosensitive drum, otherwise the photosensitive drum is easily aging or being electrified. Charging potential adjustment: Do not adjust as much as possible unless the replacement main control board or high voltage generator is replaced. Or after a certain basis, small range fine-tuning (if it is a potentiometer on the high voltage generator, it is strongly recommended not to do any adjustment). Adjustment of development bias: The high and low of development bias directly affects the depth of the photocopy concentration, and the specific adjustment should be carried out with reference to the specific model of repair manual! The standards and methods of different models of copiers are different, and the specific model adjustment is subject to the maintenance manual of the model!
Chapter 6 self-diagnosis function
The self-diagnosis of the copier mainly has two major functions: that is, the component input, output diagnostics, and fault code self-diagnosis.
First, enter the output self-diagnosis:
The self-diagnosis of the copier needs to enter the maintenance commissioning state. How to enter the maintenance status, each repair manual has a detailed introduction. Enter the diagnosis is based on the copying machine enters the maintenance status, enter the corresponding code, then change the all-wheel-off state of each sensor component (photoelectric interruption sensor, micro-trigger switch, thermistor, etc.) to detect whether their work is normal. Different models of different models, different types of different models of the same brand are similar, so slightly, so they should refer to their respective repair manuals. The output diagnosis is based on the copier enters the maintenance state, and the corresponding code is entered, and it is determined whether the output component (motor, electromagnetic clutch, relay clutch,) has a corresponding action, thereby judge whether their work is normal. Different models of different models, different types of different models of the same brand are similar, so slightly, so they should refer to their respective repair manuals. Specific code instruction maintenance brochures have specific instructions. Second, the fault code self-diagnosis:
The copier will perform real-time monitoring of different components in operation. If the input of a zer, the output is exception, the corresponding code is displayed on the control panel of the copier, and the more common fault code is generally paper paper, door Switches, lack of ink powder, waste pink, etc. can solve the fault. Other code involved in components such as: exposure exception (lamp break, temperature insurance fuse, exposure controller is poor, etc.), fixed abnormalities (fixed lamp discret, poor thermistor, solid state relay, fixed temperature safety switch Poor, poor control board, etc.); scanning light stand movement abnormal (poor motor, poor wire rope, poor motor control board); transmission abnormal (main motor drive board, poor power board, control board Poor, etc.), etc., the maintenance personnel are required to check the replacement components to solve.
Specific troubleshooting will be analyzed in the following chapter.
Chapter 7 Common Faults and Exemptions of Copers
Common faults of the copier mainly divided into components and control faults and image quality failures. There is no reader who has a certain circuit knowledge base. Do not measure the method of measuring each output terminal voltage in the power-on state, prevent the universal watch bars from burn down!
I. Components and control faults and control faults mainly include poor motor operation, control circuit board instructions, poor sensor signals, electromagnetic clutch work abnormal, power supply, failure, panel display abnormalities, and poor installation Normal wear of mechanical components, etc. Motor running adverse performance: Motor running is the host, lamp stand, lens, developed, plus powder, picking, etc., etc.) cannot be started or started, but the torque is insufficient or the speed is not uniform. Fault: Start capacitor poor (exchange motor only); motor line circle circuit; a set of wire circuit is broken; the magnetic spindle magnetic spindle is insufficient in the motor; the line or connector is poor contact; the motor control board is abnormal (later discussion). Troubleshooting: Using a multimeter power resistance gear detection motor coil (in shutdown), the fault of the coil is excluded; in the power-on state, the voltage variation of the coil terminal is detected with the DC voltage file of the multimeter, and determine whether the control signal is normal. If the AC motor should detect whether the start capacitor is damaged. Finally, if there is a spare parts replacement, you can solve it.
Control circuit board instructions incorrectly faulty: host, motor, exposure lamp, relay control board, etc. The drive signal of the corresponding output component is not or not normal. Cause: Control board is damaged or adverse; no power supply is not or abnormal; line or connector contact failure is removed: the output of the multimeter DC voltage file detects whether the power supply component output is normal, the power supply is powered by the power supply; according to the fault code The display determination may have a failed control circuit board, and then determine if its output is normal (depending on the specific line multimeter DC voltage file detects the voltage variation of the corresponding output terminal). If it belongs to a control board, the general situation is only replaced by parts. The sensor signal is poorly fault: the output of the photoelectric interrupting sensor is normally open or normally closed; the photovoltaic cell type, the output of the thermistor type is higher than or below the threshold; the contact of the microcomputer is constant or the intermittent. Cause: The power supply is abnormal; the components are poor; the line or connector is poor contact. Troubleshooting: Judging the Power Supply Article 2, the determination of the components mainly determines its output. Photoelectric occlusion type is a non-high low level output (typically 5V or 0V); the photoelectric cell type, the thermistor type is high to low level range output (generally 0 to 5V, but there is a certain high and low threshold); micro The touch is fixed to the non-conflict output (switch shuttle and disconnection). So understand the above characteristics, you can use the multimeter to target sexual measurement.
Common faults and exclusions of the copier (continued)
Electromagnetic clutch Work Athtically Fault Period: The electromagnetic clutch does not work; the work is not normal. Cause: The power supply is abnormal; the electromagnetic clutch line is broken; the oil in the clutch affects the suction force; it cannot be disconnected as follows after the halution. Troubleshooting: Detecting power supply has been explained in front; checking that the discharging of the electromagnetic clutch coil has also been explained; the clutch has oil to remove the clutch from the copier, then decompose it with alcohol, how to decompose After careful observation, recovery is the reverse step of decomposition.
Power supply adverse fault performance: copier does not work; no display; display but abnormal; multiple components cannot work properly. Harma Cause: External power supply is not; poor power line; damage to the internal device of the power component or poor solder joint; the line and connector contact is not good. Troubleshooting: Take a multimeter AC voltage 250V file detects whether the power outlet has 220V power supply; whether the power supply components in the detection have 220V power supply; use DC 50V file to detect whether the power supply part has DC output 24V, 5V (12V or -12V) The DC output of the sect is normal; whether the DC power supply of each component is normal; check whether the solder joints of the power part printed circuit board is good, otherwise it will be soldered from the solder joint with the soldering iron.
Operational Instruction Failure Fault Form: All button movements of the operator panel are invalid. Cause: Automatic protection in unconventional failures such as overheating, overvoltage, leakage, and load of overheating, overpressure, leakage, and load; Troubleshooting: Depending on the fault code, first resolve the failure to release the protection function; check if the button inside the panel has normal.
Panel Display Abnormal Fault Form: The panel shows that the light emitting diode is always on, keeps flashing or not bright. Fault Cause: Power supply; panel button; flashing indicator corresponding component. Troubleshooting: Whether the power supply is normal (5V); whether the panel button is normal; whether the part of the indicator flashes is normal.
Normal Wear Fault Performance of Poor Installation or Mechanical Components: The machine is abnormal; the quality of the photocopy has a gap; the paper is not smooth or frequent jam. Cause: If there is no position installation; parts are wear; the lifetime of the lifetime; the lubrication of the transmission parts. Troubleshooting: Check if the components are installed in place; check the lubrication and wear of each gear component; check the life of the impaired parts. Common faults and exclusion of copiers (continued)
Second, image quality failure
The image quality failure is mainly a copy of the copy, all white, bottom ash (deep, shallow), black strips, white strips, heavy shadings, blurred, fixed, paper jams. The following fault analysis is parsed by the copying process, and the causes and exclusion methods may occur and the rule is listed in the process. If you remove troubleshooting, you don't have to continue other checks.
Full black fault performance: Photocopy does not have any text (or vaguely text), but all editions are uniform black plates. Fault: Exposure lamp is broken; exposure lamp temperature fuse is blown; the mirror position (tilt angle) is not correct; the optical path is interrupted; the electrode is poor (more scholar type); the developing bias is poor; exposure; exposure; Lamp or main control circuit board is abnormal; high voltage generator and adverse wire. Troubleshooting: Troubleshooting the exposure lamp and the exposure lamp temperature fuse; check if the inclination angle of the mirror is correct (can be used to illuminate the exposure lamp with the flashlight, check whether there is imaging in the photosensitive drum); check the light path Is there a foreign body cover; check the electric power wire, the electrode holder is broken or breakdown (more Xerola model); check whether the development bias has output (the DC voltage of the multimeter is 1000V); The ground is bouncing. If all of the above conditions are normal, the fault still cannot be excluded, consider replacing the exposure lamp or the main control circuit board.
note! ! ! The adjustment of the angle of mirror is required for special tools, so it is strongly recommended that the reader does not make this adjustment!
Full white fault performance: Photocopy has no text, one white paper. Cause: Charging electrode wire break or electrode leakage; like amphimal image beam assembly; developing bias; the developer is not turned; the drum is not turned; transfer electrode wire break or electrode leakage; high pressure generator No output; light leakage. Troubleshooting: Common methods are: Copying makes the copy paper at the time of transfer electrodes, see if there is a toner image on the photosensitive drum. If there is a toner image, the high pressure portion of the transfer electrode or the transfer electrode is faulty, checking the electrode wire; whether the transfer electrode insulation seat breaks down (judge the breakdown of the electrode, there is no breakdown point, smell Whether a cocker is smelling); whether the high pressure portion is output; whether the high-voltage cable and connector contact are good. If there is no toner image, check if the developing component is operating; whether the photosensitive drum assembly is operated; whether the image of the image beat is often lit; whether the charging electrode is broken, whether the charging electrode insulating seat breaks down; whether the optical path has leakage (mainly the lens The post-shock portion is not installed or protected from partial damage); there is no output in the high pressure portion; the control circuit board has no output; whether the power supply is good, etc.
The ground ash (deep, shallow) Troubleshooting: The primary ash is the professional term for the copying machine means that the printing no image area has a relatively uniform toner point. The bottom of the bottom ash is based on the depth of the toner point. Cause: The brightness or aging of the exposure lamp; light contamination; the drum aging; the cleaning blade or the electromagnet is poor; the power generation light or the power generation electrode is poor; the high pressure is too high; the developing is poor; the automatic exposure concentration is poorly adjusted. Troubleshooting: Clean optical paths with industrial alcohol (the basic point of the cleaning optical path is not to use dry cloth or paper to rub the mirror or lens to avoid rubbing the mirror or lens, affecting the quality of the imaging quality); Whether there is a residual toner on the photosensitive drum, if there is a cleaning blade or electromagnet; cleaning the power or electric power electrode; cleaning the exposure lamp or adjust the brightness of the exposure light; adjust the range of charging and development bias (Canon brand Adjusting code, Xerox and other models generally require special machines); use standard beta to perform image density, gray level automatic exposure concentration adjustment; judgment exposure light and photosensitive drum aging. Common faults and exclusion of copiers (three)
Black Troubleshooting: Photoconte with black lines with horizontal or portrait. Cause: Light road pollution or debris block; exposure lamp or feeder has breakpoints; charging electrode pollution; light drum damage; cleaning blade; development of magnetic stick toner or carrier is luminescence; Poor or pollution of diodes; pollution of sticks; pollution of transfer guides; contaminate or damage to the fixing of the context. Troubleshooting: Depending on the longitudinality of the black strip, the occurrence area of the fault is determined laterally. Clean optical path in the optical path; dust glass; cleaning electrode seat, rack and electrode wire (if a gate wire is more cleaned); cleaning image image bearing assembly and checking if its work is normal; check the cleaning blade; Cleaning the opposite stick, transfer guide; check the coverage of the magnetic stick carrier or toner; check if the drum is damaged; check whether the settle row is contaminated or damaged. If the black line is generated with the exposure lamp, it checks if the exposure lamp and the feeder have breakpoints.
White troubleshooting: Photoconte with white lines (leaks) with landscape or portrait. Cause: Charging, transfer of the transfer electrode pollution; the toner of the developing magnetic stick is not uniform (or no powder); the photosensitive drum is damaged; the image is poorly imaged; the optical path is leaked or the light is irradiated around the light. ; Dividend on the fuser or the guide is foreign matter or damage. Troubleshooting: Check the light irradiation of the surrounding environment, cleaning the insulating seat and electrode filament of the charging and transfer electrodes; check whether the light-emitting diode of the image-like side lamp assembly is individually bright; check the toner coverage of the developing magnetic stick It is handled without powder or uneven; check whether the drum is damaged; check whether the copy paper has a moisture; check if the fixing is hosted or the guide is foreign matter or damage.
Black Point (Spot) Troubleshooting: The copy is regular or irregular ink point or spot. Cause: Analysis according to the characteristics of black or black spots. 1. Fixed or have a cycle: the manuscript glass is dirty; photosensitive drums are injured; magnetic stick damage; 2, no regular: developing component powder; cleaning the assembly leakage powder. Troubleshooting: Analysis based on the characteristics of the copy black or black spot.
Common faults and exclusion of a copy machine (continued)
Black Troubleshooting: Photoconte with black lines with horizontal or portrait. Cause: Light road pollution or debris block; exposure lamp or feeder has breakpoints; charging electrode pollution; light drum damage; cleaning blade; development of magnetic stick toner or carrier is luminescence; Poor or pollution of diodes; pollution of sticks; pollution of transfer guides; contaminate or damage to the fixing of the context. Troubleshooting: Depending on the longitudinality of the black strip, the occurrence area of the fault is determined laterally. Clean optical path in the optical path; dust glass; cleaning electrode seat, rack and electrode wire (if a gate wire is more cleaned); cleaning image image bearing assembly and checking if its work is normal; check the cleaning blade; Cleaning the opposite stick, transfer guide; check the coverage of the magnetic stick carrier or toner; check if the drum is damaged; check whether the settle row is contaminated or damaged. If the black line is generated with the exposure lamp, it checks if the exposure lamp and the feeder have breakpoints. White troubleshooting: Photoconte with white lines (leaks) with landscape or portrait. Cause: Charging, transfer of the transfer electrode pollution; the toner of the developing magnetic stick is not uniform (or no powder); the photosensitive drum is damaged; the image is poorly imaged; the optical path is leaked or the light is irradiated around the light. ; Dividend on the fuser or the guide is foreign matter or damage. Troubleshooting: Check the light irradiation of the surrounding environment, cleaning the insulating seat and electrode filament of the charging and transfer electrodes; check whether the light-emitting diode of the image-like side lamp assembly is individually bright; check the toner coverage of the developing magnetic stick It is handled without powder or uneven; check whether the drum is damaged; check whether the copy paper has a moisture; check if the fixing is hosted or the guide is foreign matter or damage.
Black Point (Spot) Troubleshooting: The copy is regular or irregular ink point or spot. Cause: Analysis according to the characteristics of black or black spots. 1. Fixed or have a cycle: the manuscript glass is dirty; photosensitive drums are injured; magnetic stick damage; 2, no regular: developing component powder; cleaning the assembly leakage powder. Troubleshooting: Analysis based on the characteristics of the copy black or black spot.
