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NCR 7194, Service Manual

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NCR 7194 Service Manual Download Page 49

Chapter 4: Servicing the Printer

4-5

5.

 

From the right side, carefully swing the base plate out and towards
the right to unhinge the left side of the plate from the tabs in the
cabinet. (See page 7.) Lower the base plate away from the printer
cabinet and lay it on a flat work surface.

6.

 

Disconnect the appropriate wires from the Control PC Board.

Note: 

If accessing the Control PC Board to disconnect wires only, you

do not need to continue.

J11 Control PC
Board Connector

J6 Cover Open 
Switch Connector

J5 Paper Feed 
Motor Connector

J15 Knife Home 
Switch Connector

J7 Paper Out 
Switch Connector

J8 Paper Low 
Switch Connector

J17 Knife Motor 
Connector

J10 Print Head
Connector

Connector Location and Designations 

Summary of Contents for 7194

Page 1: ...NCR 7194 Thermal Receipt Printer Release 1 0 Service Guide B005 0000 1098 Issue D...

Page 2: ...described herein may not be marketed by NCR in all parts of the world In some instances photographs are of equipment prototypes Therefore before using this document consult with your NCR representati...

Page 3: ...ification Interface Cable A shielded 360 degree interface cable must be used with this product The shield must be connected to the frame or earth ground connection or earth ground reference at EACH en...

Page 4: ...tended as a general guide for operators and supervisors who need to know how to use the printer It is also intended as a technical guide for programmers and system integrators who need to know the tec...

Page 5: ...over one minute of continuous printing 1 8 Chapter 2 Diagnostics and Configuration Startup Diagnostics 2 2 Runtime Diagnostics 2 3 Remote Diagnostics 2 4 Indicators 2 7 Printer Configuration 2 9 Confi...

Page 6: ...4 12 7 Removing the Platen Fixed Knife Carrier Assembly 4 13 Procedure 4 14 Fixed Knife Blade Platen Carrier Assembly Removal 4 15 Re installing the Knife 4 15 8 9 10 11 Removing the Top Cover Assemb...

Page 7: ...Switch 4 27 17 Removing the Rotating Knife Blade 4 28 Procedure 4 28 Re installing the Rotating Knife Blade 4 29 Cleaning the Printer 4 30 Cleaning the Printhead 4 30 Revision Record Issue Date Remar...

Page 8: ...television interference caused by unauthorized modification of this equipment or the substitution or attachment of connecting cables and equipment other than those specified by NCR The correction of i...

Page 9: ...Chapter 1 Technical Specifications Reliability Thermal mechanism 45 Million Lines Knife 1 5 Million Cuts...

Page 10: ...Host Integrated Voltage 24 Vdc 10 5 Volts for Logic Circuits Amps 2 Amps Maximum Current Draw Power from Power Supply Remote 55 Watts Voltage 24 Vdc 10 5 Volt Supply for the Logic Circuits Amps Short...

Page 11: ...rating Humidity 5 C to 28 C 41 F to 82 F 10 to 90 28 C to 45 C 82 F to 113 F 10 to 35 Storage Temperature Storage Humidity 10 C to 50 C 14 F to 122 F 5 to 90 Transit Temperature Transit Humidity 40 C...

Page 12: ...4 Chapter 1 Technical Specifications Dimensions and Weight Height 135 mm 5 34 inches Height with cover open 216 mm 8 53 inches Width 144 mm 5 66 inches Depth 184 mm 7 24 inches Weight 1 3 kg 2 9 pound...

Page 13: ...Specifications 1 5 Printing Specifications Speed 38 4 Lines per Second Standard Spacing Printhead Direct Thermal Fixed Head 640 Dots 576 Addressable 80 0 mm 640 Addressable 82 5 mm Paper Feed 130 mm...

Page 14: ...service call or voiding of the printer warranty Consult your NCR technical support specialist if you have any questions When the printer prints high density print lines text or graphics it automatical...

Page 15: ...ne The restrictions are ambient temperature the percentage of time measured against one minute of continuous solid printing and the amount of coverage Caution When the duty cycle approaches the limits...

Page 16: ...100 50 20 40 50 25 10 100 20 10 4 For reference A typical receipt with text contains some blank spaces is approximately 12 dot coverage A full line of text characters every cell on the line has a cha...

Page 17: ...rmed during normal printer operation Remote Diagnostics Maintained during normal operation and printed in the print test The printer can be configured with the following settings and functions through...

Page 18: ...ailure See the table in the Indicators section later in this document for the tone and LED sequences Check if paper is present Return the knife to the home position Failure causes a fault condition Se...

Page 19: ...he printer automatically turns off the appropriate motors and disables printing to prevent damage Paper out Cover open Knife unable to home Printhead too hot Voltages out of range The LED on the opera...

Page 20: ...e print test See the sample test printout on the next page These tallies can be used to determine the printer s state of health Model number Serial number CRC number Number of lines printed Number of...

Page 21: ...Chapter 2 Diagnostics and Configuration 2 5...

Page 22: ...Configuration For more information about See this section Accessing the remote diagnostic tallies 7194 Programming Information Transmit Printer ID Remote Diagnostics Extension Hexadecimal 1D 49 40 n...

Page 23: ...wly Paper is low if Paper Low Sensor is installed Printhead too hot Voltages out of range Tone Two tone Beep low frequency high frequency Startup Diagnostics completed successfully LED and Tone Single...

Page 24: ...ubleshooting The printer is also able to communicate its status to the host application if the application has been programmed to receive this information For more information about See this section C...

Page 25: ...ging any of the printer settings to avoid inadvertently changing other settings that might affect the performance of the printer The following functions and parameters can be changed with the scrollin...

Page 26: ...cs and Configuration Power Supply Wattage Knife Options Paper Low Sensor Printhead Resistance Setting For more information about See this section Using the configuration menu to configure the printer...

Page 27: ...ons printed on the receipt guide you through the processes Caution Be extremely careful changing any of the printer settings to avoid changing other settings that might affect the performance of the p...

Page 28: ...on Reset Button Rear Cover 2 Open the Rear Cover Insert paper roll as described in the Owner s Manual 3 Press the Reset Button Close the cover while holding the Paper Feed Button The printer beeps pri...

Page 29: ...to select something with a short click a long click or a series of short clicks Indicate Yes with a long click No with a short click Press and hold the Paper Feed Button for at least one second for a...

Page 30: ...232C Interface 1 click IEEE1284 Interface 2 clicks RS 232C Serial Interface Settings To change the RS 232C Serial Interface settings enter the Configuration Menu select Set Communication Interface fro...

Page 31: ...s Short click Parity Enabled Long click Disabled Short click No Even Odd Parity No Parity 1 click Even Parity 2 clicks Odd Parity 3 clicks Hardware Flow Control Software XON XOFF Long click Hardware D...

Page 32: ...as instructed to select the printer emulation you want 7194 Native Mode 1 click Epson TM T88 3 clicks Note Press the Paper Feed Button for at least one second to validate the selection For more inform...

Page 33: ...to be ignored while others use the command as a print command Ignore Carriage Return Long click Use Carriage Return as print command Short click Select the Diagnostic Modes sub menu to set Data Scope...

Page 34: ...sistance Setting See Printhead Resistance later in this document for more information Note Press the Paper Feed Button for at least one second to validate the selection For more information about See...

Page 35: ...nostic Modes Menu to enable or disable the Data Scope Mode test Off Normal Mode Data Scope Mode disabled 1 click Data Scope Mode enabled 2 clicks Receipt Test Mode 3 clicks Note Press the Paper Feed B...

Page 36: ...ics and Configuration 3 Exit the Configuration Menu The printer is on line and can communicate normally with the host computer For more information about See this section Enabling the Data Scope Mode...

Page 37: ...by removing the top cover of the printer which can only be removed by a trained service representative Caution Be extremely careful changing any of the printer settings to avoid inadvertently changin...

Page 38: ...2 22 Chapter 2 Diagnostics and Configuration...

Page 39: ...4 Service Guide Green LED slow continuous flashing Paper is low if Paper Low Sensor is installed Continuous printing of graphics regardless of room temperature causing the printhead to overheat Power...

Page 40: ...e out all the way Paper is jammed Open the receipt cover inspect the knife and clear any jammed paper Printer starts to print but stops while the receipt is being printed Paper is jammed Open the rece...

Page 41: ...mmended thermal receipt paper Clean thermal printhead with rubbing alcohol and cotton swabs Check thermal printhead cable connections Increase print density in Set Hardware Options of printer Configur...

Page 42: ...household cleaner as this may damage it and the electronics The thermal printhead does not normally require cleaning if the recommended paper grades are used If non recommended paper has been used for...

Page 43: ...cover Cables within the printer are improperly connected to the PC board Make sure the cables in the printer are properly connected to the PC board 7194 Service Guide Printer is not correctly configu...

Page 44: ...a room where temperature is below recommended temperature causing the printhead to not function properly Adjust the room temperature Move the printer to a warmer location Note The printer will shut of...

Page 45: ...Chapter 4 Servicing the Printer Tools Required 1 Pozidriv screw driver 2 Pozidriv screwdriver Equivalent Phillips Screwdrivers Flat blade screwdriver...

Page 46: ...move the Rear Cover 7 Remove the Platen Fixed Knife Carrier Assembly 13 Remove the Thermal Mechanism 10 Reset Rod 9 Paper Feed Rod Light Pipe 11 Paper Feed Button 12 Paper Low Sensor Mount 1 Remove th...

Page 47: ...rinter You will need to access the Control PC Board to disconnect wires connected to items you are removing or to replace the Board because it may have become defective or you are upgrading the memory...

Page 48: ...e printer Caution Electrostatic Discharge could damage the Control or Options PC boards Wear a grounded wrist strap and use a static mat or other ESD protected work surface when handling electronic co...

Page 49: ...it on a flat work surface 6 Disconnect the appropriate wires from the Control PC Board Note If accessing the Control PC Board to disconnect wires only you do not need to continue J11 Control PC Board...

Page 50: ...4 6 Chapter 4 Servicing the Printer To remove the Control PC Board Screws Lock Washers Options PC Board Control PC Board Base Plate Shield Screw Lock Washer...

Page 51: ...Base Plate Caution When replacing the Options PC Board ensure proper alignment of the connector on the Options PC Board with the connector on the Control PC Board Guides on the Base Plate are provide...

Page 52: ...4 8 Chapter 4 Servicing the Printer Tabs in Cabinet Options PC Board Options PC Board Connector Control PC Board Connector Options PC Board Guides Base Plate Slots in Base Plate Control PC Board...

Page 53: ...inter 2 Disconnect all the cables from the printer Caution Electrostatic Discharge could damage the Control or Options PC boards Wear a grounded wrist strap and use a static mat or other ESD protected...

Page 54: ...rews Re installing the Options PC Board Reverse the procedures above to re install the Options PC Board Caution When replacing the Options PC Board ensure proper alignment of the Options PC Board conn...

Page 55: ...he paper from the printer 2 Disconnect all the cables from the printer Caution Electrostatic Discharge could damage the Control or Options PC boards Wear a grounded wrist strap and use a static mat or...

Page 56: ...n Reverse the previous procedure to re install the Platen 1 Re install the Platen by snapping it into place right side bearing first into the Platen Carrier Assembly with the gear to the left Note The...

Page 57: ...e Blade within the Platen Carrier Assembly on the Rear Cover and the Rotating Knife Blade located on the Thermal Mechanism Whenever any part of the knife is replaced both the Fixed Knife Blade Platen...

Page 58: ...es from the printer Caution Electrostatic Discharge could damage the Control or Options PC boards Wear a grounded wrist strap and use a static mat or other ESD protected work surface when handling ele...

Page 59: ...ar Cover Platen Carrier Assembly Lock Washer 3 Pls Screw 3 Pls Fixed Knife Blade Platen Carrier Assembly Removal To Remove the Rotating Knife Blade See Removing the Rotating Knife Blade on page 27 of...

Page 60: ...k surface when handling electronic components 3 Remove the Top Cover Assembly by pushing the two tabs at the bottom rear of the paper bucket towards the back with a flat blade screwdriver Place the To...

Page 61: ...pter 4 Servicing the Printer 4 17 ear over Paper Feed Button Compression Spring Top Cover Assembly Paper Feed Rod Light Pipe Reset Rod Tabs Hook Hook Printer Base Pinch Tabs Tab locations in Paper Buc...

Page 62: ...properly To install the Reset Rod and Paper Feed Rod Light Pipe 1 Reverse the removal procedures for the Rods to install them Ensure that they seat properly in their positions Once you have reinstall...

Page 63: ...pushing the two tabs at the rear of the paper bucket towards the back with a flat blade screwdriver Lift the cover off the Base 4 Access the Control PC Board See page 3 a Place the printer on its fro...

Page 64: ...4 20 Chapter 4 Servicing the Printer Rear Cover Top Cover Assembly Tabs Hook Hook Printer Base crew Lock Washer Push Clips Paper Low Sensor aper Low ount...

Page 65: ...Paper Low Sensor Mount 1 If the Top Cover Assembly and Printer Base are still removed complete the installation by going to step b If not remove the Top Cover Assembly and Printer Base 2 Fasten the Pa...

Page 66: ...tatic Discharge could damage the Control or Options PC boards Wear a grounded wrist strap and use a static mat or other ESD protected work surface when handling electronic components 3 Remove the Top...

Page 67: ...illustration on next page Lay the Printer Base flat on the surface 7 Remove the Ground Wire from the Tear Bar 8 Lift the Thermal Mechanism up and out of the Base 9 Replace the Platen Carrier Assembly...

Page 68: ...Printer Tabs Rear Cover Top Cover Assembly Hook Hook Thermal Mechanism Tear Bar Ground Wire Screw Printer Base Platen Carrier Assembly Re installing the Thermal Mechanism Reverse the procedures to re...

Page 69: ...er Assembly by pushing the two tabs at the rear of the paper bucket towards the back with a flat blade screwdriver See page 16 4 Access the Control PC Board a Place printer on its front with the botto...

Page 70: ...e screw holding the switch to the right side Note wire routing for future reference c Cover Open Switch Carefully pry the switch out from the right side of the Mechanism Note wire routing for reinstal...

Page 71: ...c Discharge could damage the Control or Options PC boards Wear a grounded wrist strap and use a static mat or other ESD protected work surface when handling electronic components 3 Remove the Top Cove...

Page 72: ...nd out Thermal Mechanism Bearing Rotating Knife Blade Bearing Screw Actuating Arm with Slot Drive Gear with Drive Pin Re installing the Rotating Knife Blade Reverse the procedures to re install the Ro...

Page 73: ...or allow spray to come in contact with it Damage to the internal electronics or Thermal Printhead could occur If the printhead appears dirty wipe it with rubbing alcohol and cotton swabs Do not use t...

Page 74: ...4 30 Chapter 4 Servicing the Printer...

Page 75: ...wattage 2 18 printer emulations 2 16 printer settings and functions 2 16 printhead resistance 2 21 RS 232C settings 2 14 Connector locations PC board 4 5 Control board removing accessing 4 3 Control...

Page 76: ...PC board re installing 4 10 removing 4 9 P Paper out 2 3 Paper feed button re installing 4 18 removing 4 16 Paper feed rod re installing 4 18 removing 4 16 Paper jam 3 2 Paper Low 3 1 3 2 Paper low s...

Page 77: ...15 knife home switch 4 26 light pipe 4 18 options PC board 4 10 paper feed button 4 18 paper feed rod 4 18 paper low sensor mount 4 21 paper out switch 4 26 platen 4 12 rear cover 4 12 rear door 4 10...

Page 78: ...ications printing 1 5 Startup diagnostics 2 2 T Tallies See remote diagnostics Thermal mechanism re installing 4 24 removing 4 22 Tone 2 7 indicating error 3 2 two tone beep 3 2 Tools 4 1 Top cover as...

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