Craden Peripherals DP8 Front Document Roller Spring Force, Auto Alignment Skew Sensor Calibration

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5.4.8 Front Document Roller Spring Force

Gate travel must be properly adjusted (see 5.4.7) before roller spring force is adjusted

1.Raise the gate by pressing 9 4 7 FUNCT ↑A.

2.Rotate a lower drive gear to manually feed an ½” wide strip of the thinnest paper used (usually a receipt copy) under the rightmost front upper roller segment.

3.Adjust the right side roller spring tensioning screw so there is a very light drag from the roller on the paper while rotating a lower drive gear. Clockwise adjustment increases drag.

4.Repeat steps 2 and 3 for the leftmost roller segment and the roller spring tensioning screw on the left side plate.

5.4.9 Auto Alignment Skew Sensor Calibration

Roller spring tensioning screw (2)

This procedure calibrates the relative position of the 3 skew sensors with a known square document

1.Press 9 4 6 FUNCT to display “Skew Calibration”.

2.Insert a document with known square top and left edges. If the document inserts straight and its top edge is parallel to the input guide edge, press ENTER to calibrate the skew sensors and exit. If the document did not insert perfectly, press EJECT and insert again.

5.5REPLACEMENT PROCEDURES

5.5.1Cabinet

1.Turn off power

2.Insert a small flat screwdriver blade in the slot in the middle of the rear cabinet edge and pull down to flex and remove the hinge wire that fastens the cabinet to the mechanism.

3.Press the cabinet latches and lift off the cabinet.

4.To install the cabinet, raise the rear panel heatsink and place the cabinet on the baseplate so that the latches fasten. Insert one end of the hinge wire through the box flange and into the cabinet hinge plate. Flex the wire and insert the other end through the other box flange and hinge plate so that the wire snaps straight.

5.5.2Main PCB

1.Record all FUNCT 92 and 93 parameters so the new PCB can be configured correctly.

2.Disconnect the interface cable and remove the cabinet (See 5.5.1)

3.Disconnect the following cables from the Main PCB:

J1

DC power

J11

keypad

J2

document motor

J12

display

J3&4

printhead

J13

edge sensor (if installed)

J5

document motor

J15

home & document sensors

J9

DP9 dual port

J17

parallel port (if installed)

4.Remove the 5 screws fastening the Main PCB to the rear panel heatsink.

5.To replace the PCB, reverse the procedure in steps 2 to 4. Insure that the spacers remain on each mounting boss and that the 4 screws are tight. Use the longer screw to fasten the transistor and finned heatsink.

6.Reconfigure the new PCB with the FUNCT 92 and 93 parameters recorded in step 1 and the FUNCT 94 parameters listed on the configuration label.

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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
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