Troubleshooting the Printer | Epson A794-D100 instruction

A794 Owner’s Guide

Chapter 2: Using the Printer

Troubleshooting the Printer

The printer is simple and generally trouble-free, but from time to time minor problems may occur. Follow these procedures to determine the cause and resolution of any problems the printer may be having. If the procedures in this section do not correct the problem, contact a service representative.

For more information about	See this section
Detailed and technical troubleshooting	“Service Level Troubleshooting”
	in the A794 Service Guide

Printer Tone and Green LED

Problem	Possible Causes	What to Do	Where to Go
Green LED, quick	Paper out.	Put in a new paper roll.	A794 Owner’s Guide
continuous flashing.	Cover off.	Put the cover on.
	Knife unable to home.	Contact your authorized	Contact your authorized
		service representative.	service representative.
Green LED, slow	Paper is low	Put in a new paper roll.	A794 Owner’s Guide
continuous flashing.	(if Paper Low Sensor is
	installed).
	Other problems may be	Contact your authorized
	indicated.	service representative.
Printer beeps (two-	Printer has been turned	No action is required.
tone—low frequency,	on and is ready to
high frequency).	operate.
Printer beeps and flashes	These all indicate serious	Contact your authorized
green LED in various	problems.	service representative.
combinations.

March 1999

15

Image 21

Epson A794-D100 manual Troubleshooting the Printer, Printer Tone and Green LED

Contents

Owners Guide Page Disclaimer Legal Notices Power Supply Contents Programming Information Communication Interface Installations Features OptionsDescription of Printer Models Available Description of Printer Models Available Model IdentificationCommunication Interfaces Setting up the printer Installations On a Flat Surface Vertically see note Features Options Printer Controls Changing Paper Testing the Printer Using the Printer Reset Button Printer ControlsPaper Feed Button Tone Changing Paper A794 Owner’s Guide Paper jams Troubleshooting the Printer Testing the Printer Poorly printed test printout Troubleshooting the Printer Printer Tone and Green LED Troubleshooting the Printer Printer Does Not Work Printing Problems Ordering Miscellaneous Supplies Ordering Thermal Paper How to Order Thermal Paper SpecificationsOrdering Thermal Paper Manufacturers Ordering Power Supply and Power Cord Ordering Miscellaneous SuppliesOrdering Cash Drawers Wall-Mount Kit Ordering Communication Cables Paper Specifications Print Zones CharactersCharacter Sets Print Modes CharactersSize Standard Paper Specifications Print ZonesPrint Zones for 80 mm Paper Print Zones for 82.5 mm Paper Code Character Sets Code Code Code Code Code Code Code RS-232C Interface Communication Overview Using DOS to Send Commands Sending CommandsUsing Basic to Send Commands Communication Overview Print Speed and Timing RS-232C Interface DTR/DSR Protocol XON/XOFF Protocol Communication Connectors RS-232C Technical SpecificationsPower Connector Pin DB-9 Connector Pin DB-25 Connector RS-232C Settings Cash Drawer Connector Parallel Interface Ieee Bi-directional Parallel Connector Communication Interface Programming Information List of Commands Comparisons Command Descriptions Programming Information List of Commands 26 s c1 c2 n1 d1...nn dn NL nH 1D 2A n1 n2 d1...dn Comparisons Command Conventions Command Descriptions Clear Printer Printer Function CommandsPerform Full Knife Cut Hexadecimal Decimal Exceptions Generate Tone Perform Partial Knife CutHexadecimal Decimal Formulas Value of n Select Print Mode Hexadecimal Decimal Default Select Peripheral Device for Multi-DropInitialize Printer Select Paper Sensors to Output Paper End Signals Default of n ExceptionsRange of n Select Sensors to Stop Printing Enable or Disable Panel Button Generate Pulse to Open Cash Drawer Read from Non-Volatile MemoryRange of k Value of p1 Write to Non-Volatile Memory Nvram Select Cut Mode and Cut PaperValue of n1 Value of n2 Print and Feed One Line Vertical Positioning and Print CommandsActivate Carriage Return Feed n Print Lines Range of n Default Feed n Dot RowsAdd n Extra Dot Rows Print Set ColumnSet Line Spacing to 1/6 Inch Print and Feed Paper Set Line Spacing Print and Feed n Lines Horizontal Positioning Commands Horizontal TabSet Right-Side Character Spacing Set Absolute Starting Position Set Horizontal Tab Positions Value of k Default Set Relative Print Position Compatibility Information A794 receipt vs. A793 receipt Select Justification Set Left Margin Range of nLRange of nH GS P x y Set Horizontal and Vertical Minimum Motion Units Set Printing Area Width Print Characteristics Commands Select Double-Wide CharactersSelect Single-Wide Characters Select 90 Degree Counter-Clockwise Rotated Print Select Pitch Column WidthHexadecimal Decimal Related Information Select Character Set Values and Ranges Define User-Defined Character Set Select or Cancel Underline Mode Cancel User-Defined Character Copy Character Set from ROM to RAMESC 0 0 Select or Cancel Double Strike Select or Cancel Emphasized Mode Select Character Code Table Select or Cancel Italic Print Select or Cancel 90 Degree Clockwise Rotated Print Select or Cancel Upside-Down Print ModeSelect International Character Set Select or Cancel Smoothing Mode Select Or Cancel White/Black Reverse Print Mode Summary of Rotated Printing Select Superscript or Subscript Modes Print Raster Graphics Graphics CommandsDownload BMP Logo Hexadecimal Decimal Value = Number of dots to be moved from the beginning of the line Select Bit Image Mode Select Single-Density Graphics Select Double-Density Graphics Select the Current Logo Ranges Define Downloaded Bit Image Convert 6 Dots/mm Bitmap to 8 Dots/mm Bitmap Print Downloaded Bit ImageHexadecimal 1D 2F m Decimal Value and Range of m Printer Status Commands Transmit Peripheral Device Status RS-232C printers only Request Alternate Status parallel printers only Hexadecimal Decimal Values Transmit Paper Sensor Status Hexadecimal 1D 49 n Decimal Transmit Printer ID Values of n Transmit Printer ID, Remote Diagnostics Extension Programming Information A794 Owner’s Guide Select or Cancel Automatic Status Back ASB Default ASB disabled Exceptions Undefined Off Not used. Fixed to off Transmit Status When n is out of the specified range, the command is ignored Send Printer Software Version Print Test FormAX t Rules for Using Real Time Commands Real Time Commands Moving Data through the Buffer Busy Line and Fault Conditions Recognizing Data from the Printer Real Time Request to Printer Related Information = Transmit Printer Status Real Time Status Transmission = Transmit RS-232C Busy Status = Transmit Error Status = Transmit Receipt Paper Status Hexadecimal Decimal Value of Byte Real Time Printer Status Transmission Bar Code Commands Select Printing Position of HRI CharactersSelect Pitch of HRI Characters Print Bar Code Select Bar Code Height UPC-A Select Bar Code Width Default Formulas Print and Return to Standard Mode Mode CommandsCancel Print Data in Page Mode Hexadecimal 0C Decimal Exceptions Select Page Mode Print Data in Page ModeHexadecimal 1B 0C Decimal Exceptions Hexadecimal 1B 4C Decimal Exceptions Ascii ESC S Select Standard Mode Default Exceptions Select Print Direction in Page Mode Set Print Area in Page Mode Select Character Size Set Absolute Vertical Print Position in Page Mode Set Relative Vertical Print Position in Page Mode Macro Commands Select or Cancel Macro DefinitionHexadecimal 1D 3A Decimal Formulas Execute Macro Value of rValue of t Printer operation Flash Download Commands Return Boot Sector Firmware Part Number Switch to Flash Download ModeReturn Segment Number Status of Flash Memory ESC Select Flash Memory Sector to Download Return Boot Sector CRCGet Firmware CRC Range of n Exceptions Erase All Flash Contents Except Boot Sector Return Main Program Flash CRCErase Selected Flash Sector Ch * 256 + cl Ffff hexadecimal Download to Active Flash Sector March 127 Erase User Flash Sector Reset Firmware Basic Index 130 March March 131 132 March