Craden Peripherals DP8 technical manual Theory of Operation, Maintenance

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3.13.7	Erratic Document Feed, Mispositioning or Overprinting	20
3.13.8	Rollers Run at Power-Up or After Document Ejected	20
3.13.9	Erratic Character Spacing or Carriage Hitting End Stops	20
3.13.10	Interface Inoperative	20

4.0THEORY OF OPERATION

4.1	OVERVIEW		21
	4.1.1	Carriage Drive Assembly	21
	4.1.2	Document Drive Assembly	21
	4.1.3	Switching Power Supply	21
	4.1.4	Main Printed Circuit Board	22
	4.1.5	Keypad/Display Assembly	22

4.2ELECTRONICS IN DETAIL

4.2.1	Low Voltage Supplies	22
4.2.2	Microprocessor System	22
4.2.3	Stepper Motor Drivers	22
4.2.4	Printhead Drivers	25
4.2.5	Keypad and Display	25
4.2.6	Sensors	25
4.2.7	Character Printing	25

5.0MAINTENANCE

5.1 LUBRICATION AND CLEANING

	5.1.1	Lubrication	27
	5.1.2 Document Feed Roller Cleaning		27
	5.1.3	Sensor Cleaning	27
	5.1.4	Printhead Cleaning	28
	5.1.5 Document Print Area Cleaning		28
	5.1.6	Cabinet Exterior Cleaning	28
5.2	SERVICE PARAMETER SET-UP PROCEDURE		29
5.3	ELECTRICAL ADJUSTMENTS		29

5.4MECHANICAL ADJUSTMENTS

5.4.1	Printhead Gap	30
5.4.1.1	Ribbon Shield Removal/Replacement	31
5.4.1.1.1 Ribbon Shield Face Inspection		32
5.4.2	Carriage Drive Belt Tension	33
5.4.3	Document Drive Belt Tension	33
5.4.4	Carriage Shaft Cam and Shaft Rack	33
5.4.5	Rear Document Roller Spring Force	33
5.4.6	Auto Alignment Gate Ramp	34
5.4.7	Auto Alignment Gate Height	34
5.4.8	Front Document Roller Spring Force	35
5.4.9	Auto Alignment Skew Sensor Calibration	35

5.5REPLACEMENT PROCEDURES

5.5.1	Cabinet	35
5.5.2	Main PCB	35
5.5.3	Sensor PCB	36
5.5.4	Keypad	36
5.5.5	Display	36
5.5.6	Power Supply PCB	36
5.5.7	Carriage Motor	36
5.5.8	Document Motor	37
5.5.9	Printhead	37
5.5.10	Carriage Drive Belt	37
5.5.11	Document Drive Belt	37

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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 DP8 & DP9 Technical Manual Table of Contents OperationMaintenance Theory of OperationRecommended Spare Parts Recommended Service Tools TroubleshootingMajor Assembly Illustrations & Parts Lists Document Characteristics Physical CharacteristicsInterface Environment & StandardsInstallation Procedure Reshipment Operation Ribbon Cartridge LoadingDisplay Operation Keypad OperationKeypad & Display Panel Configuration Category Press ConfigurationDocument Insertion Display Printer ParametersRemarks Override Parameters Communication ParametersDisplay Remarks Service Parameters Diagnostics Power Up DiagnosticsEnhanced Diagnostics Error Conditions Document JamCarriage Fault Self TestCommand Summary Hex CommandProgramming AsciiESC H ESC KESC L ESC RPrint Commands Stops double height print Low Density Graphics Commands High Density Graphics CommandsDisplay Commands DC3Status and Keypad Commands Configuration CommandsDP XE DJ KB BZ BA Installing Craden Drivers on Windows 95 or AsciiMeaning DriversInstalling Craden USB Drivers on Windows NT, 2000 or XP Installing Craden Drivers on Windows NT, 2000 or XPUsing Printer Resident Device Fonts Writing to the Printer LCD Display InterfacingFunct Input Buffer OperationInterface Signals & Cables Pin Signal DescriptionPrinter Pin PC-25 Pin PC-9 Pin Signal Problem SolvingCarriage Fault or No Carriage Motion Rollers Run at Power-Up or After Document EjectedNo Document Motion No Printing or Light PrintingCarriage Drive Assembly Document Drive AssemblySwitching Power Supply Theory of Operation OverviewKeypad/Display Assembly Main Printed Circuit BoardMicroprocessor System Stepper Motor DriversPhase a I0A I1A Phase B I0B I1B Current Stepper Motor Drive Circuit U20 15 aKeypad and Display Refer to Schematic #72135 Printhead DriversSensors Character PrintingI L Printhead Drive CircuitMaintenance Lubrication and Cleaning 5.1.1 LubricationDocument Feed Roller Cleaning Sensor CleaningPrinthead Cleaning Document Print Area CleaningCabinet Exterior Cleaning Harsh, abrasive cleanersService Parameter SET-UP Procedure Electrical AdjustmentsMechanical Adjustments 5.4.1 Printhead Gap Ribbon Shield Removal / Replacement Ribbon Shield Face Inspection Carriage Drive Belt Tension Document Drive Belt TensionCarriage Shaft Cam and Shaft Rack Rear Document Roller Spring ForceAuto Alignment Gate Ramp Auto Alignment Gate HeightReplacement Procedures Front Document Roller Spring ForceAuto Alignment Skew Sensor Calibration CabinetPower Supply PCB Sensor PCBKeypad DisplayDocument Motor PrintheadCarriage Drive Belt Document Drive BeltTroubleshooting Basic Troubleshooting ProcedureNo Display Defective KeypadNo Document Motion Defective SensorNo Carriage Motion No Print or Light Print Symptom Condition RemedyPrint Quality Missing Dots Erratic Document Feed or MispositioningErratic Character Spacing or False Document Jams Interface InoperativeDiagnostic Flowchart Use this flow chart to assist in troubleshootingRecommended 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