Craden Peripherals DP8 technical manual Stepper Motor Drive Circuit, U20 15 a

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			+38V
A	Phase		3718
			3718
I0 current		Current	Phase
I1 current		Current	Phase
I1 current		Control	Control
			D
		VREF	C
		VREF	One
		Comp.	One
		Comp.	Shot
			Shot
			B
			R4 Typ

U20 - 15 A

R4 B

J2 - 1 C

J2 – 3 D

≈ 2.7 mSec

≈ 5.5 mSec

0.4v

0.0v

38v0v

Fig. 4.1 Stepper Motor Drive Circuit

Image 29

Contents Airport HIGHWAY, PENNSAUKEN, NJ R I P H E R a L S R P O R a T I O NRevision ALL Record of ChangesPages Affected Operation DP8 & DP9 Technical Manual Table of ContentsTheory of Operation MaintenanceMajor Assembly Illustrations & Parts Lists TroubleshootingRecommended Spare Parts Recommended Service Tools Physical Characteristics Document CharacteristicsInterface Environment & StandardsInstallation Procedure Operation Ribbon Cartridge Loading ReshipmentKeypad & Display Panel Keypad OperationDisplay Operation Document Insertion ConfigurationConfiguration Category Press Remarks Printer ParametersDisplay Display Remarks Communication ParametersOverride Parameters 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 DC3DP XE DJ KB BZ BA Configuration CommandsStatus and Keypad Commands Ascii Installing Craden Drivers on Windows 95 orMeaning DriversUsing Printer Resident Device Fonts Installing Craden Drivers on Windows NT, 2000 or XPInstalling Craden USB Drivers on Windows NT, 2000 or XP 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 Carriage Motion Defective SensorNo Document Motion Print Quality Symptom Condition RemedyNo Print or Light Print Erratic Document Feed or Mispositioning Missing DotsErratic Character Spacing or False Document Jams Interface InoperativeUse this flow chart to assist in troubleshooting Diagnostic FlowchartDescription PART# Recommended Service ToolsRecommended Spare Parts Printer Diagram All assemblies not ending in X are used both on DP8 and DP9 DP8 & DP9 Assembly TreeDWG REV. C Page Page Page Page Page Page Page