Craden Peripherals DP8 technical manual Phase a I0A I1A Phase B I0B I1B Current

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Motor rotation occurs by sequentially changing the phase and current signals to the two motor coils. Motor speed is controlled by how rapidly the signals are changed. Following is a state table where each state change rotates the document motor rotor 1/400 of a revolution (1/120" of document motion) and there are 8 distinct states before the pattern repeats. Direction of motor rotation can be reversed by moving up rather than down through the state table. The 2 motor windings are labeled Phase A and Phase B and the phase and 2 current level signals for each winding are shown. The state table for the carriage motor is similar but the states with 0% current are skipped so each state change rotates the carriage motor rotor 1/200 of a revolution (1/120" of carriage motion).

Phase A I0A I1A Phase B I0B I1B						A Current		B Current
1	0	0	1	0	0	100%	Forward	100%	Forward <--
1	0	0	0	1	1	100%	Forward	0%	Reverse
1	0	0	0	0	0	100%	Forward	100%	Reverse
0	1	1	0	0	0	0%	Reverse	100%	Reverse
0	0	0	0	0	0	100%	Reverse	100%	Reverse
0	0	0	1	1	1	100%	Reverse	0%	Forward
0	0	0	1	0	0	100%	Reverse	100%	Forward
1	1	1	1	0	0	0%	Forward	100%	Forward ---

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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