Craden Peripherals DP8 technical manual I L, Printhead Drive Circuit

Page 31

FIRE

NO CHOP

FIRE EXT

	12	RCLK
		RCLK
		U5
	10	SRCLR Q
		SRCLR Q
D34
		U13
D35		Timer
D35

Q26 TYP.

U12 6

D23 TYP.

+38VDC

C O I L

FIRE NO CHOP FIRE EXT

U5 PIN 15

U13 PIN 3

-- 38V

Q7 SOURCE

-- 70V

50V --

Q26 DRAIN

COIL

CURRENT

Fig. 4.2 Printhead Drive Circuit

(dashed lines are for revision F and later boards)

Image 31

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 Environment & Standards Document CharacteristicsPhysical Characteristics InterfaceInstallation 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 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 CommandsStatus and Keypad Commands Configuration CommandsDP XE DJ KB BZ BA Drivers Installing Craden Drivers on Windows 95 orAscii MeaningInstalling Craden USB Drivers on Windows NT, 2000 or XP Installing Craden 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 DisplayNo Document Motion Defective SensorNo Carriage Motion No Print or Light Print Symptom Condition RemedyPrint 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 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