I L, Printhead Drive Circuit | Craden Peripherals DP8 instruction

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)

Page 31

Image 31

Craden Peripherals DP8 technical manual I L, Printhead Drive Circuit

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 Contents Theory of Operation Maintenance Recommended Spare Parts Recommended Service Tools TroubleshootingMajor Assembly Illustrations & Parts Lists Environment & Standards Document CharacteristicsPhysical Characteristics Interface Installation Procedure Operation Ribbon Cartridge Loading Reshipment Display Operation Keypad OperationKeypad & Display Panel Configuration Category Press ConfigurationDocument Insertion Display Printer ParametersRemarks Override Parameters Communication ParametersDisplay Remarks Diagnostics Power Up Diagnostics Service Parameters Self Test Enhanced DiagnosticsError Conditions Document Jam Carriage Fault Ascii Command SummaryHex Command Programming ESC R ESC HESC K ESC L Print Commands Stops double height print DC3 Low Density Graphics CommandsHigh Density Graphics Commands Display Commands Status and Keypad Commands Configuration CommandsDP XE DJ KB BZ BA Drivers Installing Craden Drivers on Windows 95 orAscii Meaning Installing 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 Funct Problem Solving Interface Signals & CablesPin Signal Description Printer Pin PC-25 Pin PC-9 Pin Signal No Printing or Light Printing Carriage Fault or No Carriage MotionRollers Run at Power-Up or After Document Ejected No Document Motion Theory of Operation Overview Carriage Drive AssemblyDocument Drive Assembly Switching Power Supply Stepper Motor Drivers Keypad/Display AssemblyMain Printed Circuit Board Microprocessor System Phase a I0A I1A Phase B I0B I1B Current U20 15 a Stepper Motor Drive Circuit Character Printing Keypad and Display Refer to Schematic #72135Printhead Drivers Sensors Printhead Drive Circuit I L Sensor Cleaning MaintenanceLubrication and Cleaning 5.1.1 Lubrication Document Feed Roller Cleaning Harsh, abrasive cleaners Printhead CleaningDocument Print Area Cleaning Cabinet Exterior Cleaning Electrical Adjustments Service Parameter SET-UP Procedure Mechanical 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 Rack Auto Alignment Gate Height Auto Alignment Gate Ramp Cabinet Replacement ProceduresFront Document Roller Spring Force Auto Alignment Skew Sensor Calibration Display Power Supply PCBSensor PCB Keypad Document Drive Belt Document MotorPrinthead Carriage Drive Belt Defective Keypad TroubleshootingBasic Troubleshooting Procedure No Display No 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 Jams Use this flow chart to assist in troubleshooting Diagnostic Flowchart Recommended 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