Craden Peripherals DP8 technical manual Ribbon Shield Face Inspection

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5.4.1.1.1 Ribbon Shield Face Inspection

A high percentage of printers sent to Craden for repair has a ribbon shield that has reached end of life and is the primary cause of the printer’s problem. Document jams, damaged documents, streaking, poor print quality, and document skewing can often be alleviated by replacing ribbon shields after four to five ribbon replacements. Below is a guide to assist in ribbon shield inspection.

New ribbon shield. Face is smooth, no defects

Ribbon shield at end of life. Face is scored. There is no visible damage to the six-sided opening but a breech is imminent. This shield may begin to snag documents.

Damaged ribbon shield. There is a breech in the six-sided opening. This ribbon shield will streak and tear documents.

Damaged ribbon shield. One side of the six-sided opening is missing. This ribbon shield will streak and tear every document and may scratch the platen.

The angle between the face and base (back) of the ribbon shield must be perpendicular. Ribbon shields are made of thin stainless steel and if bent can cause poor print quality or snag the ribbon fabric.

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Contents Revision R I P H E R a L S R P O R a T I O NAirport HIGHWAY, PENNSAUKEN, NJ Pages Affected Record of ChangesALL Operation DP8 & DP9 Technical Manual Table of ContentsTheory of Operation MaintenanceRecommended Spare Parts Recommended Service Tools TroubleshootingMajor Assembly Illustrations & Parts Lists Physical Characteristics Document CharacteristicsInterface Environment & StandardsInstallation Procedure Operation Ribbon Cartridge Loading ReshipmentDisplay Operation Keypad OperationKeypad & Display Panel Configuration Category Press ConfigurationDocument Insertion Display Printer ParametersRemarks Override Parameters Communication ParametersDisplay Remarks Diagnostics Power Up Diagnostics Service ParametersError Conditions Document Jam Enhanced DiagnosticsCarriage Fault Self TestHex Command Command SummaryProgramming AsciiESC K ESC HESC L ESC RPrint Commands Stops double height print High Density Graphics Commands Low Density Graphics CommandsDisplay Commands DC3Status and Keypad Commands Configuration CommandsDP XE DJ KB BZ BA Ascii Installing Craden Drivers on Windows 95 orMeaning DriversInstalling Craden USB Drivers on Windows NT, 2000 or XP Installing Craden Drivers on Windows NT, 2000 or XPUsing Printer Resident Device Fonts Interfacing Writing to the Printer LCD DisplayFunct Input Buffer OperationPin Signal Description Interface Signals & CablesPrinter Pin PC-25 Pin PC-9 Pin Signal Problem SolvingRollers Run at Power-Up or After Document Ejected Carriage Fault or No Carriage MotionNo Document Motion No Printing or Light PrintingDocument Drive Assembly Carriage Drive AssemblySwitching Power Supply Theory of Operation OverviewMain Printed Circuit Board Keypad/Display AssemblyMicroprocessor System Stepper Motor DriversPhase a I0A I1A Phase B I0B I1B Current U20 15 a Stepper Motor Drive CircuitPrinthead Drivers Keypad and Display Refer to Schematic #72135Sensors Character PrintingPrinthead Drive Circuit I LLubrication and Cleaning 5.1.1 Lubrication MaintenanceDocument Feed Roller Cleaning Sensor CleaningDocument Print Area Cleaning Printhead CleaningCabinet Exterior Cleaning Harsh, abrasive cleanersElectrical Adjustments Service Parameter SET-UP ProcedureMechanical Adjustments 5.4.1 Printhead Gap Ribbon Shield Removal / Replacement Ribbon Shield Face Inspection Document Drive Belt Tension Carriage Drive Belt TensionCarriage Shaft Cam and Shaft Rack Rear Document Roller Spring ForceAuto Alignment Gate Height Auto Alignment Gate RampFront Document Roller Spring Force Replacement ProceduresAuto Alignment Skew Sensor Calibration CabinetSensor PCB Power Supply PCBKeypad DisplayPrinthead Document MotorCarriage Drive Belt Document Drive BeltBasic Troubleshooting Procedure TroubleshootingNo Display Defective KeypadNo Document Motion Defective SensorNo Carriage Motion No Print or Light Print Symptom Condition RemedyPrint Quality Erratic Document Feed or Mispositioning Missing DotsErratic Character Spacing or False Document Jams Interface InoperativeUse this flow chart to assist in troubleshooting Diagnostic FlowchartRecommended Spare Parts Recommended Service ToolsDescription PART# Printer Diagram DWG REV. C DP8 & DP9 Assembly TreeAll assemblies not ending in X are used both on DP8 and DP9 Page Page Page Page Page Page Page