Paxar 656 / 636 user manual Print Head Replacement

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Print Head Replacement

NEVER REMOVE THE PRINT HEAD FROM THE PRINTER EXCEPT

FOR REPLACEMENT.

TURN OFF THE POWER TO THE PRINTER BEFORE STARTING ANY

ELECTRONIC COMPONENT REPLACEMENT.

NOTE: The Anti-static wrist strap (which must contact the skin and be tight) and anti-static gloves must be worn at all times when handling a print head to avoid damaging the print head.

1)Review the Printhead Handling Procedure Sheet packaged with each print head to determine if any procedures have changed before beginning this procedure.

2)Remove the ink from the machine for easy print head removal.

3)Unplug the ribbon cable that runs to the print head. Unplug the cable by firmly, but gently pulling it out.

4)Back the print head pressure screws off counterclockwise as far as possible.

5)Place your hand (with static gloves on) underneath the print line of the print head and push up to release the locator pins on the heat sink, while pulling the print head to the right of the machine. This will remove the print head assembly from the mount plate. You may need to "help" the print head out by pushing on the heat sink with your left hand.

6)Remove the two print head mount screws located on the top of the print head with a 2.5mm ball driver.

7)Remove the old printhead carefully from the heat sink.

8)Place the new print head into the heat sink. Check to see that the new printhead sits square in the heat sink and that there is no end play. If there is end play, or the head does not seat properly, the heat sink guide will need adjustment.

9)Replace the two print head lock screws. Be sure that the head is resting flat on the heat sink before tightening these screws.

10)Replace the print head assembly in the printer, making sure that the pin at the back of the heat sink goes into the hole in the mount plate. Make sure that the guide pins insert into both the front and back grooves.

11)Reconnect the print head cable, making sure that the connector is seated tightly.

NOTE: If the cable is not connected correctly, the print head will be destroyed when the machine is powered on. Check to see that the cable is tight by observing from underneath the print head. The ribbon cable connector should be inside of the black connector located on the print head.

12)Replace the ink and double check your work. Power the machine on and make sure that no adverse effects are noted. As a final test of the print head installation, run a test pattern to check the print quality. You should observe an even grid of chevrons. If you do not see such a grid, you may wish to reference the topic of print head tangent adjustment.

Users Manual Model 656/636

Maintenance / Adjustments • 31

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Contents Paxar Systems Group Manual Edition February Model 656This page intentionally blank Contents Electrical Connections Assembly Drawings Page Scope Safety Issues / WarningsIntroduction Limited Warranty Warranty InformationService PartsLocation of Printer Customer ResponsibilityUnpacking AC Power LinePaxar 656 / 636 Tool KIT #351390 Inventory of ComponentsInstalling the Stacker Printer SetupBoard Installation Fuse ConfigurationInstall P.C. Boards as follows Installing the Power Cord TCB Dip Switch S2 SettingsInstalling the PC Software Installing the PC Interface CablePrinter Description Product DescriptionUnit Specification Personal Computer SpecificationsSelfform Printer Operation Installing Ink RibbonPaxar Field Engineer Must be Present Stock Threading Loading StockButt Splice Web Guide AdjustmentFigure Print Head Open / Closed Print Head Open / ClosePrinter Controls Control Panel OperationStart FeedStop Error Indicator LightsOn Line SensorPrint Reports Front Panel Menu FunctionsLCD Display Diagnostic TestsBuilding Image Imager VXX Ready for Batches Imager VXX Batch ID QTYLast Batch WAS Imager VXX Display Modes Print Report ModePress Enter for Print Reports Press Enter to Print Last Verifier ScanSetup Mode Change the CUT Cutter is Disabled Press Enter to EnableChange Strobe Strobe 0 NEW Strobe +2 Emulation MODE630 NEW Emulation MODE650Transfer TYPE052 NEW Transfer TYPE000 Life Counters ModePress Enter to Print Checkout Format Press Enter for Life CountsProtected Mode Verifier is Enabled Press Enter to Disable Change Password 4 Digits NEW WordChange DATE/TIME Press Enter For 2ND LanguagePrint Head Handling Maintenance / AdjustmentsHandling Procedure Print Head CleaningSupplies Print Head Replacement Clean Platen Roller Print Head AdjustmentPrint Head Pressure Setting TangentAdjusting Print Sensor Position Registration Sensor AdjustmentSquaring the Print Head Print Head Tangent PointSensor Trim Pots Cleaning Print SensorHole / Slot Index Registration Sensor DIP Switch Bank LightsFilm Out Sensor / Top Ink Sensor Reflective Index Registration SensorBottom Ink Sensor TP8Knife Square Adjustment Stock out AdjustmentHeadlift Sensor Full Stacker Sensor Jam SensorStock Feed Adjustment Stacker AdjustmentsMechanical Adjustment of Stock Sense Mark Light Receiver Mechanical Adjustment Of Feed Roller Pressure Blue RollerAdjustment Procedure GeneralPage Electrical Connections Machine WiringRelay Assembly Electrical System Schematic Motherboard Power Connectors Power Up / Sign On / Communications Electrical Trouble ShootingProblem Probable Cause Corrective Action Stock / Ink Advance Problem Probable Cause Corrective Action Print Problem Probable Cause Corrective Action Cut / Stack Electrical Trouble Shooting / Machine Set Up Sequence Stock Mechanical Trouble ShootingProblem Probable Cause Corrective Action Ink Print Knife Problem Probable Cause Corrective ActionTCB Lubrication Procedure Mechanical Trouble Shooting SequenceCam Lubrication Procedure Composition Iglide BearingsAppendix a Error MessagesAppendix B Software Upgrade Chip Placement PositionsThermal Control Board P/N Head Driver Board P/N Diskless Rom Board P/NFront Panel Board P/N Ink and Stock Transfer Types Appendix CValue Transfer Type Value Transfer Type Knife MFG Guideline Appendix DAppendix D Appendix D Page Assembly Drawings Unwind Assembly Drawing Description Qty Unwind Parts ListWeb Guide / Light Bar Assembly Drawing Web Guide / Light Bar Parts List Drive Assembly Drawing Drive Parts List Printhead Assembly Drawing Printhead Parts List Ink Unwind / Rewind Assembly Ink Unwind / Rewind Parts List Field Retrofit Kit Ink Rewind Arbor AssemblyInk Rewind Arbor Parts List Feed & Ink Drive Assembly Feed & Ink Drive Parts List Timing Belt Threading Diagram Timing Belt Parts List Ink Turn Roller Assembly Ink Turn Roller Parts List Knife Assembly Drawing Part Qty Description Number Knife Parts ListStacker Assembly Drawing Stacker Parts List Rewind Assembly Drawing Rewind Parts List Stock Out Sensor Assembly Drawing Part Qty Description Number Stock Out Sensor Parts ListOptional Stackers Stacker Specifications Optional 4.25 Pick-up Assembly Optional 4.25 Pick-up Parts List Optional 4.25 Stacker Assembly Optional 4.25 Stacker Parts List Optional Down Stacker Assembly Drawing Part Optional Down Stacker Parts List Part Optional Down Stacker Assembly Drawing Part Rear Support Stacker Optional Down Stacker Assembly Drawing Part #8 Thumb Screw Cap
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