Craden Peripherals DP8 technical manual Auto Alignment Gate Ramp, Auto Alignment Gate Height

Page 39

1.Use a spring gauge to measure the force required to raise the right end of the rear upper roller very slightly. It should measure 6 to 8 ounces (170 to 225 gm).

2.If necessary, adjust this force by loosening the roller spring cam screw on the right side plate and raising or lowering the cam.

3.Repeat steps 2 & 3 on the left end of the rear upper roller.

5.4.6Auto Alignment Gate Ramp

The gate ramp is properly adjusted if the screws that mount the roller springs to the gate have about 0.02” (0.5mm) clearance to the bottom of the side plate slots when the gate arm is at rest against the left side plate stop. Field adjustment is usually unnecessary. If it is necessary:

1.Insert a long 3/32 Allen wrench through the slot in the input tray and loosen the ramp adjustment screw. The input tray may be removed by removing 3 screws from the baseplate if you are unable to locate the ramp screw through the input tray slot.

2.Hold the ramp arm against the stop on the left side plate and move the ramp adjustment screw toward the left until the gate just begins to rise. Tighten the screw in this position

Ramp Arm

Ramp

Ramp Adjustment Screw

Move ramp this way to raise gate

Move ramp this way to lower gate

View: Ramp arm from front of printer with input tray removed

5.4.7 Auto Alignment Gate Height

The gate ramp must be properly adjusted (see 5.4.6) before gate height is adjusted.

1.Raise the gate by pressing 9 4 7 FUNCT A.

2.Press FUNCT to adjust gate height. The gate fingers should be as close as possible (within 0.02” or 0.5mm) to the input guide without touching it. Each press of Awill slightly raise the gate and each press of Bwill slightly lower the gate. When the gate is at the correct height, press ENTER.

3.Press Bto lower the gate and then press Ato check for correct gate height. Press Bto

lower the gate and CLEAR to exit the test.

Roller Segments

Input Guide

Roller Shaft

Gate fingers

Looking into the document drive. Input tray removed for clarity. Gate in “up” position

34

Image 39
Contents R I P H E R a L S R P O R a T I O N RevisionAirport HIGHWAY, PENNSAUKEN, NJ Record of Changes Pages AffectedALL Operation DP8 & DP9 Technical Manual Table of ContentsTheory of Operation MaintenanceTroubleshooting Recommended Spare Parts Recommended Service ToolsMajor Assembly Illustrations & Parts Lists Environment & Standards Document CharacteristicsPhysical Characteristics InterfaceInstallation Procedure Operation Ribbon Cartridge Loading ReshipmentKeypad Operation Display OperationKeypad & Display Panel Configuration Configuration Category PressDocument Insertion Printer Parameters DisplayRemarks Communication Parameters Override ParametersDisplay Remarks Diagnostics Power Up Diagnostics Service ParametersSelf Test Enhanced DiagnosticsError Conditions Document Jam Carriage FaultAscii Command SummaryHex Command ProgrammingESC R ESC HESC K ESC LPrint Commands Stops double height print DC3 Low Density Graphics CommandsHigh Density Graphics Commands Display CommandsConfiguration Commands Status and Keypad CommandsDP XE DJ KB BZ BA Drivers Installing Craden Drivers on Windows 95 orAscii MeaningInstalling Craden Drivers on Windows NT, 2000 or XP Installing Craden USB Drivers on Windows NT, 2000 or XPUsing Printer Resident Device Fonts Input Buffer Operation Writing to the Printer LCD DisplayInterfacing FunctProblem Solving Interface Signals & CablesPin Signal Description Printer Pin PC-25 Pin PC-9 Pin SignalNo Printing or Light Printing Carriage Fault or No Carriage MotionRollers Run at Power-Up or After Document Ejected No Document MotionTheory of Operation Overview Carriage Drive AssemblyDocument Drive Assembly Switching Power SupplyStepper Motor Drivers Keypad/Display AssemblyMain Printed Circuit Board Microprocessor SystemPhase a I0A I1A Phase B I0B I1B Current U20 15 a Stepper Motor Drive CircuitCharacter Printing Keypad and Display Refer to Schematic #72135Printhead Drivers SensorsPrinthead Drive Circuit I LSensor Cleaning MaintenanceLubrication and Cleaning 5.1.1 Lubrication Document Feed Roller CleaningHarsh, abrasive cleaners Printhead CleaningDocument Print Area Cleaning Cabinet Exterior CleaningElectrical Adjustments Service Parameter SET-UP ProcedureMechanical Adjustments 5.4.1 Printhead Gap Ribbon Shield Removal / Replacement Ribbon Shield Face Inspection Rear Document Roller Spring Force Carriage Drive Belt TensionDocument Drive Belt Tension Carriage Shaft Cam and Shaft RackAuto Alignment Gate Height Auto Alignment Gate RampCabinet Replacement ProceduresFront Document Roller Spring Force Auto Alignment Skew Sensor CalibrationDisplay Power Supply PCBSensor PCB KeypadDocument Drive Belt Document MotorPrinthead Carriage Drive BeltDefective Keypad TroubleshootingBasic Troubleshooting Procedure No DisplayDefective Sensor No Document MotionNo Carriage Motion Symptom Condition Remedy No Print or Light PrintPrint Quality Interface Inoperative Missing DotsErratic Document Feed or Mispositioning Erratic Character Spacing or False Document JamsUse this flow chart to assist in troubleshooting Diagnostic FlowchartRecommended Service Tools Recommended Spare PartsDescription PART# Printer Diagram DP8 & DP9 Assembly Tree DWG REV. CAll assemblies not ending in X are used both on DP8 and DP9 Page Page Page Page Page Page Page