Panasonic KX-P7100 manual High Voltage Control Circuit

Page 62

KX-P7100

4.4.11. High Voltage Control Circuit

1.Charge Control Circuit

This circuit consists of a DC-DC converter, which boosts +24V to approximately +5.4kV ( constant current approx. +300µA ) for the charge corona. nCHGCTL signal controls the charge output. If the signal goes low,the output is turned on.

2.Grid Circuit

When the charge circuit is activated ( when the signal nCHGCTL is low ), this circuit is activated and approximately +900V is generated on the grid.

3.Development Bias Control Circuit

When the charge circuit is activated ( when the signal nCHGCTL is low ), this circuit is activated.

This voltage is changed between +100V and +500V in accordance with the PWM ( Pulse Width Modulation ) signal nDB when the signal nDBCH is low. Also approximately - 150V is generated when signal nDB and nDBCH is high.

4.Transfer Control Circuit

This circuit consists of a DC-DC converter, which boosts +24V to -400V — -3000V ( constant current ).

This current is changed between -4µA and -20µA in accordance with the PWM ( Pulse Width Modulation ) signal nTR when the signal nTRCTL is high.

5.Transfer Roller Cleaning Control Circuit

This circuit consists of a DC-DC converter, which boosts +24V to +1500V. This voltage is generated when signal nTR is high and nTRCTL is low.

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Contents KX-P7100 KX-P7100 Contents Specifications PrinterPaper Interface, Options, Accessories, and Supplies Others About Media Margins and Print Area Indicators Printer Panel Indicators / ButtonKX-P7100 Parts Identification Front Side View Rear Side ViewComponent Layout and Paper Path Electrical Components and Sensor Boards Switches and Solenoids Charge Development / CleaningPrint Process ExposureFusing TransferPaper Feed Media TrayLaser Beam Laser Scan Unit ExposureOperation Theory Cylindrical Lens and Lens Collimator LensPolygon Scanner LensFuser Unit Paper Ejection and Paper Switchback Normal Printing Mode Not Duplex ModeInstallation Requirements SetupKX-P7100 Repacking Material RequiredKX-P7100 KX-P7100 Removal and Replacement Procedures Front and Rear CoversFront Cover Disassembly Rear Cover DisassemblyLeft Cover Right, Left and Top CoversRight Cover Top CoverLaser Scanning Unit LSU Relay Board BHigh Voltage Board and Power Supply Unit High Voltage BoardPower Supply Unit Power Supply Unit DisassemblyMain Controller Board Indicator Board and Toner Empty Sensor BoardMain Controller Board and Fuser Drive Gear Fan Motor Fuser Drive GearDrive Gear Unit and Motor Gear Support Bracket, Motor and Drive Gear UnitGear Support Bracket Drive Gear Unit Disassembly Upper Exit Roller Holder Upper Exit Roller Holder DisassemblyUpper Exit Roller Holder Fuser Unit Disassembly Heat Lamp Heat RollerThermostat KX-P7100 Pickup, Paper Feed, Registration and Transfer Rollers Pickup Roller and Pickup SolenoidPaper Feed Roller / Registration Roller Registration RollerTransfer Roller Assembly Auto Duplex Unit ADU Auto Duplex Pinch and Registration RollersAuto Duplex Disassembly KX-P7100 KX-P7100 Electronic Circuit Description and Diagrams Block DiagramConnection Diagram Connection DiagramPower Supply Main Control Board Main Control CPUGDI Asic IC3 Dram I/FUSB Chip DramAsic KME Clock Reset Circuit Main Motor Drive Circuit Motor Current will be cut off in case of OFF condition above Laser Scanning Unit Control Circuit Fuser Temperature Control Circuit High Voltage Control Circuit Eeprom Control Circuit Safety Interlock SW Registration Solenoid Driver Circuit Solenoids Control CircuitPickup Control Solenoid Drive Circuit Switchback Solenoid Drive Control Circuit Top Sensor Circuit Sensors CircuitRegistration Sensor Circuit Exit Sensor Circuit Fan Control Circuit FanctlInternal Engine I / F Control CPU Engine CPU PprdyTiming Chart Engine I / F Communication Main Control Board POWER+5V GND+24V POWER+5VLD POWER+5V Usol Pusolctl Puctl Sensors, Indicator and Relay Boards KX-P7100 1. CN1 to Front Panel 3. CN3 LSU Control SignalsMain Board 2. CN2 OPC Drum Unit Interlock SW4. CN4 USB I / F Connector 5. CN6 Centronics Parallel I / F7. CN8 Door + 24V Interlock SW 6. CN7 PSU-MAIN Connector9. CN10 HVU-MAIN Connector 8. CN9 ThermistorCN12 Pickup Solenoid CN14 Switchback Solenoid10. CN11 Polygon Motor CN13 Registration SolenoidCN19 FAN Control 15. CN16 Exit SensorCN18 Main Motor CN20 Toner Empty SensorPaper Exit / ADU Paper Jam Sensor Board Indicator BoardRegistration & Paper Top Sensor Board Toner Empty Sensor Board 1. CN451 Toner Empty SensorIC1 Main Control CPU IC2 InvertersIC3 GDI Asic MA9IC5 Dram VSS1 GNDIC6 Asic Rsto OUTIC9 Comparators IC10 Reset ICIC8 USB Chip IC11 Engine Control CPU 10. IC12 Eeprom11. IC14 Motor driver IC 12. IC15 InvertersUser Maintenance Recommended CleaningMaintenance Tables GeneralKX-P7100 Lubrication Service Maintenance Maintenance CycleCounter Reset Recommended LubricationSelf-Diagnostic Indicators Printer Status Paper JamUser Error Call for Service Initial Troubleshooting Flowchart No Operation Print Quality White Vertical Line in PrintBlank Print Dark Vertical Line in Print Dark Horizontal Line in Print Dirty Background All-black Print Light Print Ghosting Black or White Dots Toner Spatter Paper Jam Media Tray Empty or MisfeedJam at a Jam at B Jam at C Jam at D, E Call Service 1. E20119 2. E30 3. E31 4. E32 5. E50 6. E54 7. E71 8. E73 9. E81 Replacement Parts List with Lubrication Guide Exterior127 Right Side Parts 128Main Controller Board Connector Pickup Roller and Paper Feed Roller Motor and Drive Gear Unit Left Side Parts Power Supply Unit and High Voltage Board Rear and Top Side Parts Fuser Unit 134135 Bottom Side Parts 136137 Mechanical Base Media Tray Paper Cassette Packing Component Side View Parts Side View ICs CapacitorsResistors All resistor values are in OHMsTransistor and Diodes Connectors OthersRegistration & Paper Top Detection Sensor Board Resistor values is in OHMsRelay Board a Resistor values are in OHMs

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