Xerox Phaser 3155 User Manual
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Phaser 3140/3155/3160 Printer Service Manual2-11 Theory of Operation Control Panel The Control Panel is the user interface for display of printer status and operation of the printer. Controller Board The Controller Board consists of the CPU and printer control functions. The CPU functions as the bus control, I/O handling, drivers, and PC interface. The Controller Board sends the current image video data to the Laser Unit and manages the electrophotographic printing process. Circuits on the Controller Board drive the Motor (paper feed), Clutch, Heat Lamp, and Fan. The signal from the Out Bin Empty Sensor is input directly to the Controller Board. Note Each printer model has a unique Controller Board. The following illustration shows the 3160N Controller Board. Error LED Online LED Cancel Button Power Button s3160-080 CN2 CN8 CN12 CN9 CN10 CN6 CN5 CN7 CN15 USB ENET CN1 s3160-093 Downloaded From ManualsPrinter.com Manuals
2-12Phaser 3140/3155/3160 Printer Service Manual Theory of Operation Memory The Controller Board has Flash and DRAM memory. • Flash Memory: Stores System Program and can be updated via USB interface. • DRAM Memory: It is used as Swath Buffer in printing, and System Working Memory Area. Power Supply Board The Power Supply board consists of low voltage and high voltage circuitry and supplies power to the entire printer. The low voltage circuit supplies DC power to the printer. It converts 110V/220V to +5V and +24V DC. The high voltage circuit outputs the high voltage for the THV/MHV/BIAS signals. The high voltage output is supplied to the Print Cartridge and Transfer Roller. AC heater control circuitry supplies power to the Fuser. Transfer High Voltage (THV+) The (+) Transfer High Voltage is supplied to the Transfer Roller for transferring toner onto the OPC Drum to the paper. • Input Voltage: 24 VDC ± 15% • Output Voltage: MAX +5.0 KV ± 5% (duty variable, no loading) • Input Contrast of the Voltage Stability Degree: less than ± 3% (fluctuating input 21.6V~26.4V) • Loading contrast: ± 3% or less • Output Voltage Rising Time: 50 ms Max • Output Voltage Falling Time: 100 ms Max • Fluctuating Transfer Voltage with Environmental Various: 0 V~5 KV P/JCON2 P/JCON1s3160-092 Downloaded From ManualsPrinter.com Manuals
Phaser 3140/3155/3160 Printer Service Manual2-13 Theory of Operation • Environment Recognition Control Method: The THV-PWM ACTIVE is the transfer active signal. It detects the re sistance change of the transfer roller (due to environmental changes) which alters this voltage feed-back signal. For more information, see “Transfer” on page 2-18. • Output Voltage Control Method: The Transfer Output Voltage is output and controlled by changing the duty cycle of the THV/PWM signal. Charge Voltage (MHV) High voltage is supplied to the OPC drum through the charging roller while charging the skin of the OPC drum. • Input Voltage: 24 VDC ± 15% • Output Voltage: -1.0 KV ~ -1.8 VDC ± 3% • Output Voltage rising time: 50 ms Max • Output Voltage Failing Time: 50 ms Max • Output Control Signal (MHV-PWM): CPU is HV output when PWM is Low. Cleaning Voltage (THV-) • -1.2 KV ± 15% • The (+) Transfer Voltage is not output because the THV PWM is controlled with high. • The (-) Transfer Voltage is output because the THV-Enable Signal is controlled with low. • The output fluctuation range is large because there is no feedback control and connection resistor. Developing Voltage (DEV) The Developing Voltage is supplied to the Developer Roller to transfer to the toner to the charge on the OPC Drum scanned by the laser beam while printing the image. The engine controls whether the high voltage is supplied and its quantity. • Input voltage: 24 VDC ± 15% • Output voltage: -200 V ~ -600 V DC ± 3% • Output voltage fluctuation range: PWM control • Input contrast of the output stability degree: ± 3% or lessLoading contrast: ± 3% or less • Output voltage rising time: 50 ms Max • Output voltage falling time: 50 ms Max • Output Control Signal (BIAS-PWM): The CPU output is HV output when PWM is low. Downloaded From ManualsPrinter.com Manuals
2-14Phaser 3140/3155/3160 Printer Service Manual Theory of Operation Supply • Output voltage: -400 V ~ -800 VDC ± 50 V (ZENER using, DEV) • Input contrast of the output stability degree: under ± 5% Loading contrast: ± 5% or less • Output voltage rising time: 50 ms Max • Output voltage falling time: 50 ms Max • Output Loading range: 10 M Ohm ~ 1000 M Ohm • Output control signal (BIAS-PWM): The CPU is HV output when PWM is Low. Power Supply The Power Supply (switch-mode power supply, SMPS) supplies DC power for driving the printer, and the AC heater control, which supplies power to the Fuser. The Power Supply has two output channels: +5.0 V and +24 V. AC Input • Input rated voltage: • AC 110 V~127 V • AC 220 V~240 V • Input voltage fluctuation range: • AC 99 V~140 V • AC 198 V~265 V • Rated frequency: 50/60 Hz • Rated frequency fluctuating range: 47~63 Hz • Input current: under 4.0 A/2.0 A (when the lamp is Off or rated voltage is inputted/outputted) Rated Output Power ItemCH1CH2Remark Channel Name +5.0 V +24.0 V Connector Pin CON2 5V PIN: 8, 15, 16 CON2 24 V PIN: 5, 6, 9, 10, 12 Rated Output +5.1 V ± 5% (4.845 ~ 5.355 V) +24 V ± 15% (20.4 ~ 27.6 V) Max. Output Current 1.2 A 2.0 A Peak Loading Current 1.5 A 2.5 A Under 100 ms Downloaded From ManualsPrinter.com Manuals
Phaser 3140/3155/3160 Printer Service Manual2-15 Theory of Operation Ripple & Noise Vo ltage Under 100 mVp-p Under 500 mVp-p Maximum Output 6 W 48 W Peak output 7.5 W 60 W Under 100 ms Protection for Loading Shortage and Overflowing Current Shut down or Fuse Protection Shut down (or Output Voltage Drop ItemCH1CH2Remark Downloaded From ManualsPrinter.com Manuals
2-16Phaser 3140/3155/3160 Printer Service Manual Theory of Operation Sensor Input Circuit Paper Empty Sensing The Paper Empty (width) Sensor on the Power Supply detects the state of paper empty and the state of narrow paper widt h. If the Paper Empty sensor fails to detect paper existence, it can mean that the Paper Tray is empty, or that narrow paper is installed. When the print job comes to the CPU, the pickup action is performed regardless of a paper empty condition. If the paper comes through to the Feed Sensor, the CPU recognizes the use of narrow paper, if not, the paper empty state is recognized and the red LED on the Control Panel is illuminated. Manual Feed Sensing Through the operation of an actuator on the frame, the Manual Feed Sensor (photo interrupter) detects the existence of paper. The CPU recognizes paper in the manual feeder, and feeds it into the printer. Paper Feeding/With Print Cartridge Sensing When media passes the Feed Sensor actuator, the Feed Sensor sends the feed event to the CPU. If the Feed Sensor does not detect media after a predetermined time, a Jam0 state occurs. Whether the Print Cartridge is inserted or not is detected by CRUM. After the cartridge is mounted, the sub- CRUM re ads the print cartridge information from contact with CRUM involved in print cartridge. If the Print Cartridge is invalid, the red LED on the Control Panel illuminates. s3160-142 Output Bin Full Sensor Paper Exit Sensor Paper Empty SensorPaper Feed SensorCover Open Sensor Manual Feed Sensor Downloaded From ManualsPrinter.com Manuals
Phaser 3140/3155/3160 Printer Service Manual2-17 Theory of Operation Exit Sensor The Exit Sensor, located on the Fuser, detects the media as it exits the Fuser. The CPU monitors the on/off timing of th e Exit Sensor signal and determines normal operation or the presence of a jam (Jam2). If a paper jam is detected, the red LED on the Control Panel illuminates. Out Bin Full Sensor The Out Bin Full Sensor detects when the output tray is full If the sensor detects the output tray is full, the red LE D on the Control Panel illuminates. Front Cover Interlock The Front Cover Interlock switch is located on the Power Supply. When the Front Cover is open, the +24 V that is supplied to the Motor, solenoids, Fan, Laser Unit, and the high voltage circuitry is cut off. When the Front Cover is open, the Status LED changes to red. Driving Circuit Fan and Solenoid Driving The Fan, Pick Up Solenoid, and the Manual Feed Solenoid are driven by signals from the Controller Board. A diode protects the driving transistor from the noise pulse that is created when the solenoid is de-energizing. Motor Driving The Controller Board contains the motor interface circuits, and the Drive Assembly contains a motor control board with a driver IC. Downloaded From ManualsPrinter.com Manuals
2-18Phaser 3140/3155/3160 Printer Service Manual Theory of Operation Engine F/W Control Algorithm Feeding The printer feeds the paper from the manual feeder when the Manual Feed Sensor indicates that paper is present in the manual feeder. When feeding from the Paper Tray, the drive of the Pick Up Roller is controlled by the Pick Up Solenoid. While paper moves, the occurrence of a jam is judged as fo ll ows . Transfer The charging voltage, developing voltage, and transfer voltage are controlled by Pulse Width Modulation (PWM). Each output voltage is changeable due to the PWM duty cycle. The transfer voltage used when the paper passes the Transfer Roller is decided by environmental recognition. The resistance value of the Transfer Roller changes due to the surrounding environment of the printer or the voltage value. This change in resistance in turn changes the value of the voltage due to loading. This voltage is fed back into the printer through the A/D converter. Based on the value fed back, the PWM cycle is changed to maintain the required transfer voltage. ItemDescription JAM 0 The leading edge of the paper did not pass the Feed Sensor. ■After paper has been picked up, paper did not enter the printer. ■After paper has been picked up, pape r enters the printer, but did not reach the Feed Sensor in the specified time. ■If the Feed Sensor does not indicate On after paper has been picked up, the printer re-picks. If after re-picking, the Feed Sensor is still not activated, a JAM 0 error occurs. This is an indication that the leading edge of the paper already passed the Feed Sensor. ■Even though paper reaches the Feed Sensor, the Feed Sensor is not activated. JAM 1 The paper is between the Feed Sensor and the Exit Sensor. ■After the leading edge of the paper passes the Feed Sensor, the trailing edge of the paper cannot pass the Feed Sensor in the specified time. (The Feed Sensor cannot be OFF.) ■After the leading edge of the paper passes the Feed Sensor, the paper cannot reach the Exit Sensor in the specified time. JAM 2 After the trailing edge of the paper passes the Feed Sensor, the paper does not pass the Exit Sensor in the specified time. Downloaded From ManualsPrinter.com Manuals
Phaser 3140/3155/3160 Printer Service Manual2-19 Theory of Operation Fusing The temperature change of the Heat Roller’s surface is detected by the value of the Thermistor. The Thermistor resistance is measured using the A/D converter through which the CPU can determine the temperature of the Heat Roller. AC power is controlled by comparing the target temperature to the value from the Thermistor. If the value from the Thermistor is out of the controlled range while controlling the fusing process, an error is reported. Recovering from Heat Error The printer automatically recovers from the heat error when the error is only caused by low heat error, and not the heat errors in Warm-Up state and the Over Heat error. When an error occurs, the engine memorizes the present temperature. When a Low Heat error occurs, the maximum heat is supplied to the fixing unit. After a specified time elapses, the engine detects the temperature again. If the temperature is higher than the memorize d temperature, the error is recovered. When an Over Heat error occurs, no heat is supplied to the fixing unit. After a specified time elapses, the engine detects the temperature again. If the temperature is a specified degree lowe r than the memorized temperature, the error is recovered. Fuser Thermal Errors ErrorDescriptionLED Display Open Heat Error When the engine operates at the warm-up state, the temperature of the fixing unit is not higher than a specified temperature. When the error occurs, the engine stops all functions and keeps it at error state. LED blinking. Low Heat Error The Low Heat Error can occur when the engine is at Standby, Printing, or Warm- Up mode. If the temperature of the fixing unit is lower than the specified temperature at each state, and the lower temperature state is maintaining during a specified time, the Low Heat Error occurs. When this error occurs, the engine stops all functions and keeps it at error state. LED blinking. Over Heat Error If the temperature of the fixing unit is higher than the expected temperature, and the high temperature state is maintained over a specified time. When this error occurs, the engine stops all functions and keeps it at error state. LED blinking. Downloaded From ManualsPrinter.com Manuals
2-20Phaser 3140/3155/3160 Printer Service Manual Theory of Operation Laser Unit The Laser Unit receives image data from the PVC or HPVC and makes the latent image on the OPC surface. The Laser Unit uses a single beam system. The errors related to the Laser Un it are shown in the table below: LSU Error Recovery If the LReady or Hsync error happens, the paper exits out beforehand. The engine mode is changed to recovery mode and the engine informs the main system of the engine mode. The engine checks the Laser Un it error, and if the error doesn’t recur the printing job will proceed. ErrorDescription LReady When printing starts, the engine drives the polygon motor of the Laser Unit. If the motor is not in a ready status after a specified period of time elapses, the engine detects the error that the polygon motor is not in a ready status. If this error occurs, the engine stops all functions and remains in the error state. The red LED is illuminated to inform the error status to the user. Hsync This error occurs when the Polygon Motor speed is steady but the Hsync is not generated. When the polygon motor is ready, the Laser Unit sends a Hsync signal that synchronizes each image line. If the engine does not detect the signal consecutively over a fixed time, it defines the Hsync Error. If this error occurs, the engine stops all functions and remains in the error state. The red LED is illuminated to inform the error status to the user. Downloaded From ManualsPrinter.com Manuals