Craden Peripherals DP8 Interface Signals & Cables, Pin Signal Description, Problem Solving

Page 24

3.12.3 Interface Signals & Cables

The interface provides for RS-232 communication. All signals are available on a 9 pin male connector equivalent to Cinch DB-9P. All connectors have 4-40 threaded inserts for positive mating. Pin assignments are as follows:

Pin

Signal

Description

2

Transmit Data (TD)

From printer, transmits printer status.

3

Receive Data (RD)

To printer, receives data & commands.

4

Request to Send (RTS)

Connected to pin 6 for looping PC DTR to DSR

5

Signal Ground

Attached to printer logic ground.

6

Data Set Ready (DSR)

Connected to pin 4.

7

Clear To Send (CTS)

To printer, enables status transmissions.

8

Data Terminal Ready(DTR)

From printer, indicates printer ready (and buffer available if

 

 

DTR protocol is selected).

The following cable connection will work correctly in most applications using PC type 25 or 9 pin serial ports. A shielded cable with ONLY one end of the shield connected to a metal connector cover or pin 1 of a 25 pin connector is recommended to increase immunity to static discharges and other electrical noise.

Printer Pin

PC-25 Pin

PC-9 Pin

Signal

3

2

3

Data to Printer

2

3

2

Data from Printer

6,8

5,6

6,8

DTR to PC CTS & DSR

5

7

5

Signal Ground

Some applications do not allow DSR to be removed when the printer is busy. Use the following cabling with such software.

Printer Pin

PC-25 Pin

PC-9 Pin

Signal

3

2

3

Data to Printer

2

3

2

Data from Printer

8

5

8

DTR to PC CTS

-

6,20

4,6

PC DTR to PC DSR

5

7

5

Signal Ground

3.13 Problem Solving

These are the most common printer problems that can be solved by an operator. If multiple printers are at one site, it can be useful to swap printers and cables to isolate a problem to a printer, cable or host. Printer (92 FUNCT) and Communication (93 FUNCT) parameters should be set the same for all printers. Service (94 FUNCT) parameters should be set per the label inside each printer.

3.13.1 No Display or Blocks Displayed

If nothing appears on the display on power up, check that:

1.The power switch on the rear of the printer is ON.

2.The input power cord is plugged into both printer and supply outlet.

3.The contrast knob is adjusted for proper contrast.

4.The input power cord is plugged into a live supply outlet

3.13.2Unchangeable Configuration Parameters

If configuration parameters cannot be changed with the A↑ key, the keypad is probably locked. See 3.5.3 to unlock the keypad.

19

Page 23 Page 25
Image 24
Page 23 Page 25
Contents R I P H E R a L S R P O R a T I O N RevisionAirport HIGHWAY, PENNSAUKEN, NJ Record of Changes Pages AffectedALL DP8 & DP9 Technical Manual Table of Contents OperationMaintenance Theory of OperationTroubleshooting Recommended Spare Parts Recommended Service ToolsMajor Assembly Illustrations & Parts Lists Document Characteristics Physical CharacteristicsInterface Environment & StandardsInstallation Procedure Reshipment Operation Ribbon Cartridge LoadingKeypad Operation Display OperationKeypad & Display Panel Configuration Configuration Category PressDocument Insertion Printer Parameters DisplayRemarks Communication Parameters Override 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 DC3Configuration Commands Status and Keypad CommandsDP XE DJ KB BZ BA Installing Craden Drivers on Windows 95 or AsciiMeaning DriversInstalling Craden Drivers on Windows NT, 2000 or XP Installing Craden USB 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 KeypadDefective Sensor No Document MotionNo Carriage Motion Symptom Condition Remedy No Print or Light PrintPrint 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 Service Tools Recommended Spare PartsDescription PART# Printer Diagram DP8 & DP9 Assembly Tree DWG REV. CAll assemblies not ending in X are used both on DP8 and DP9 Page Page Page Page Page Page Page
Top Page Image Contents