Page 1: Impact Slip Printer
NCR 7156 Thermal Receipt and Impact Slip Printer: Service Guide BD20-1437-A Issue B September 1997...
Page 2 Information in this document is subject to change without notice. Therefore, before using this document, consult your NCR sales representative for information that is applicable and current. NCR reserves the right to improve products as new technology, components, software, and firmware become available.
Page 3 100-240 Vac, 1.5/0.8 A, 50/60 Hz, output rated 24 Vdc, 2.3 A. Use of this product with a power supply other than the NCR power supply will require you to test this power supply and NCR printer for FCC and CE mark certification.
Page 4 However, there is no guarantee that interference to radio communications will not occur in a particular commercial installation. If this equipment does cause interference, which can be determined by turning the equipment off and on, the user is encouraged to contact NCR immediately.
Page 5: Table Of Contents
Quick Reference This Quick Reference will direct you to key areas of the Service Guide. For a complete listing of topics, consult the Table of Contents or the Index. Setting Up the Printer page 7 Basic requirements for unpacking and installation, connecting the printer, turning it on, and running the print test.
Page 6 The service guide is intended as a guide for service representatives, field engineers, and those who will be installing and learning about the 7156 printer. It can also be used as a reference for service courses.
Page 7 7156 Service Guide Contents Contents Section One: Printer Information and Setup Chapter 1: About the 7156 Printer Features ............................4 Receipt Station........................4 Slip Station .......................... 4 Both Stations ........................4 General Features ........................ 5 Options ............................5 Chapter 2: Setting Up the Printer What Is in the Box? ........................
Page 8 Contents 7156 Owner’s Guide Verifying Read of MICR Characters ................34 Running the Data Scope Mode..................35 Testing the Slip and Receipt Stations................36 Level 2 Diagnostics........................39 Level 3 Diagnostics........................39 Print Test ..........................39 Running the Print Test by Power Cycling the Printer..........40 Running the Print Test by Opening and Closing the Cover........
Page 9 7156 Service Guide Contents Chapter 7: Disassembling and Reassembling the Thermal Receipt Mechanism Tools............................71 Thermal Printhead ........................72 Removing the Printhead ....................72 Replacing the Printhead ....................73 Knife Assembly ........................74 Removing the Knife Assembly..................74 Replacing the Knife Assembly ..................
Page 10 Contents 7156 Owner’s Guide Chapter 10: Hinge Arm Assembly and Sensor Bracket Tools............................105 Disassembling the Hinge Arm Assembly ................106 Reassembling the Hinge Arm Assembly ................107 Disassembling the Sensor Bracket..................108 Reassembling the Sensor Bracket ..................108 Chapter 11: MICR Assembly Tools..........................
Page 11 7156 Service Guide Contents Section Four: Base Feed Assembly Chapter 15: Removing the Base/Feed Mechanism Tools............................141 Preparation..........................142 Separating Mechanisms from the Base/Feed Mechanism..........143 Chapter 16: Forms Compensation Arm Assembly Tools............................145 Removing the Forms Compensation Arm Assembly............146 Disassembling the Forms Compensation Arm Assembly ..........
Page 12 Contents 7156 Owner’s Guide Section Five: Appendixes Appendix A: Printer Specifications Print Specifications: Both Stations..................165 Slip Station Specifications ....................166 General Information....................... 166 Slips/Forms Print Zone....................166 Power Requirements......................166 Power from Host ......................166 Power from Power Supply.................... 167 Environmental Requirements....................
Page 13 7156 Service Guide Contents Appendix C: Common PC Board and Extender Cables Appendix D: Ordering Paper and Supplies Ordering Thermal Receipt Paper ..................181 Ordering Forms ........................181 Ordering Ribbon Cassettes ....................182 Ordering Other Supplies...................... 182 Ordering Documentation ..................... 183...
Page 14 Contents 7156 Owner’s Guide Revision Record Issue Date Remarks September 97 First printing September 98 Second printing, including minor revisions September 1998...
Page 15: Section One: Printer Information And Setup
7156 Service Guide Section One: Printer Information and Setup Section One: Printer Information and Setup • Chapter 1: About the 7156 Printer • Features • Options • Chapter 2: Setting Up the Printer • What Is in the Box •...
Page 17: Chapter 1: About The 7156 Printer
Extended Slip Table Note: Some 7156 models may appear slightly different from what is shown in the illustration. The procedures are the same for all models unless otherwise noted. The 7156 printer is a fast, quiet, relatively small and very reliable multiple- function printer.
Page 18: Features
Chapter 1: About the 7156 Printer 7156 Service Guide Features The 7156 printer comes with several features and options. Receipt Station • Thermal printing • Standard pitch (host selectable): 15.2 characters per inch, 44 columns • Compressed pitch (host selectable): 19.0 characters per inch, 56 columns •...
Page 19: General Features
• Power and communication support for a remote 2x20 pass-through display • Audible tone (controlled by application) Note: The 7156 does not use a paper journal. The journal is kept electronically by the host computer. Options • Magnetic Ink Character Recognition (MICR) check reader built into the slip station for verifying checks (includes custom MICR field parsing) •...
Page 20 Chapter 1: About the 7156 Printer 7156 Service Guide September 1998...
Page 21: Setting Up The Printer
Chapter 2: Setting Up the Printer Chapter 2: Setting Up the Printer This chapter describes some of the basic procedures for setting up the 7156 printer. See the 7156 Setup Guide or the 7156 Owner’s Guide for more information about loading the paper and installing the ribbon cassette.
Page 22: Removing The Packing Material
Chapter 2: Setting Up the Printer 7156 Service Guide Removing the Packing Material Receipt Cover Once the printer is removed from the foam pack and plastic bag, open the receipt cover by pulling up on the front left corner. Remove the paper roll, discard any packing material, and remove the test printout from inside the receipt bucket.
Page 23: Repacking The Printer
Remove the ribbon cassette and cables from the box. Save all packing materials for future storing, moving, or shipping the printer. Complete the Installation report card and send it to NCR. Caution: Remove the foam restraint and the cardboard support before using the printer.
Page 24: Choosing A Location
7156 Service Guide Choosing a Location The 7156 printer takes up relatively little counter space and may be set on or near the host computer. Make sure there is enough room to open the receipt cover to change the paper and to open the front cover to change the ribbon cassette.
Page 25: Setting Dip Switches
Front Cover Note: Switch 1 is shown in the off position for reference. Note: Some 7156 models may appear slightly different from what is shown in the illustration. The procedures are the same for all models unless otherwise noted. September 1998...
Page 26: Connecting The Cables
Chapter 2: Setting Up the Printer 7156 Service Guide Connecting the Cables RS-232C models receive power from a power supply (remote) and use one cable for communication and a separate cable for power. LCSIO (RS-485) models receive power from the host computer (integrated) and use one cable for both communication and power.
Page 27 7156 Service Guide Chapter 2: Setting Up the Printer Cash Drawer Strain Relief Cash Drawer Connector 2 Bushings Connector 1 Cable Power Communication Cable Access Cable Cable Clamps Cover Power Connector Communication Connector Bottom of the Printer September 1998...
Page 28: Lcsio (Rs-485) Models (Integrated)
Chapter 2: Setting Up the Printer 7156 Service Guide LCSIO (RS-485) Models (Integrated) The printer receives its power from a host computer and has one cable for power and communication. Follow these steps to connect the communication-power cable to the printer and host computer.
Page 29: Turning On The Printer
7156 Service Guide Chapter 2: Setting Up the Printer Turning On the Printer On Line Button with Recessed On Line Button Plunger On Line On Line Green LED Green LED Paper Status Paper Status Red LED Red LED Paper Feed Button...
Page 30: Lcsio Rs-485 Models
Chapter 2: Setting Up the Printer 7156 Service Guide Running the Print Test by Power Cycling the Printer RS-232C Models Press the On Line button (or plunger) to put the printer off-line. Use a paper clip or other pointed object to depress the plunger on models with that item.
Page 31: Sample Print Test For Rs-232C Models
7156 Service Guide Chapter 2: Setting Up the Printer Sample Print Test for RS-232C Models September 1998...
Page 32: Sample Print Test For Lcsio (Rs-485) Models
Chapter 2: Setting Up the Printer 7156 Service Guide Sample Print Test for LCSIO (RS-485) Models September 1998...
Page 33: Cleaning The Printer
• Ultraviolet light There is no scheduled maintenance required for the 7156. Clean the cabinet as needed to remove dust and finger marks. Use any household cleaner designed for plastics, but test it first on a small unseen area. If the receipt bucket is dirty, wipe it with a clean, damp cloth.
Page 34 Chapter 2: Setting Up the Printer 7156 Service Guide September 1998...
Page 35: Chapter 3: Diagnostics
7156 Service Guide Chapter 3: Diagnostics Chapter 3: Diagnostics The following diagnostic tests are available for the 7156: • Level 0 Diagnostics Performed during the startup cycle • Level 1 Diagnostics (setup mode) Available in a dedicated environment and accessed through the DIP Switches •...
Page 36: Level 1 Diagnostics
Chapter 3: Diagnostics 7156 Service Guide Level 1 Diagnostics Level 1 diagnostics (setup mode) allow you to change the settings for various printer functions and to run certain tests using the DIP switches. Keep the following information in mind when changing the settings: •...
Page 37: Setting Printhead Resistance
7156 Service Guide Chapter 3: Diagnostics Setting Printhead Resistance This function changes the setting for the thermal printhead resistance. The setting must match the character (A-D, 0-3; or A-H) stamped on the heatsink in back of the printhead, visible by removing the top cover of the printer. See “Removing the Top Cover” in chapter 6.
Page 38: Setting Partial Cut Distance
Chapter 3: Diagnostics 7156 Service Guide Setting Partial Cut Distance This function changes the length of the partial knife cut: the higher the number, the longer the cut. Caution: The DIP switches are pre-set at the factory and should generally not be changed.
Page 39: Setting Data Error And Data Buffer Options (Rs-232C Models Only)
7156 Service Guide Chapter 3: Diagnostics Setting Data Error and Data Buffer Options (RS-232C Models Only) This function allows you to select the handling of data reception errors and to select the size of the data buffer. Caution: The DIP switches are pre-set at the factory and should generally not be changed.
Page 40: Ignoring/Using The Carriage Return
Ignore CR (hexadecimal 0D) Use CR (hexadecimal 0D) as Print Command (Default)* *Emulates the NCR 7150™ printer. On models with the On Line button (or plunger) on top of the printer, close the front cover and press the On Line button (or plunger).
Page 41: Checking And Adjusting The Micr Check Reader (Common Board And Rs-232C Models)
7156 Service Guide Chapter 3: Diagnostics Checking and Adjusting the MICR Check Reader (Common Board and RS-232C Models) The adjustment described in this section cancels or sharply reduces extraneous signals picked up by the Magnetic Ink Character Recognition (MICR) check reader. Use these procedures on newer LCSIO (RS-485) models with the common PC board and on all RS- 232C models (older RS-232C boards and newer common PC boards).
Page 42 Chapter 3: Diagnostics 7156 Service Guide Insert a blank slip into the slip station from the left side so that it covers the MICR read head, but does not come into contact with the feed rolls. See the illustration on the facing page.
Page 43 7156 Service Guide Chapter 3: Diagnostics Adjust the MICR Check Reader Top of Printer Paper Paper Feed Button MICR Read Head Potentiometers Carriage Assembly Feed Roll Assembly The procedures to adjust the MICR check reader involve setting the DIP switches and adjusting the two MICR check reader potentiometers on the PC board.
Page 44: Checking And Adjusting The Micr Check Reader (Lcsio-Rs-485 Micr Amplifier Board)
Chapter 3: Diagnostics 7156 Service Guide Set both potentiometers (on the PC board) to mid range using a screwdriver. Adjust the lower potentiometer (R9) on the PC board either direction. The green LED should be on before you adjust the potentiometer.
Page 45 7156 Service Guide Chapter 3: Diagnostics Access the MICR Amplifier Board Do the following steps to remove the receipt and top covers. Be sure there is paper in the receipt bucket. Turn the power to the printer off by turning the host computer off.
Page 46 Chapter 3: Diagnostics 7156 Service Guide DIP Switch Front Cover Paper Switch 1 is shown in the OFF position Front of Printer Close the front cover. Insert a blank slip into the slip station so that it covers the MICR read head, but does not come into contact with the feed rolls.
Page 47 7156 Service Guide Chapter 3: Diagnostics Press the paper feed button on the PC board to take a noise sample. Repeat steps 2 and 3 until the lowest number of characters is printed. You may need to adjust the potentiometer both directions to get the best setting.
Page 48: Verifying Read Of Micr Characters
Chapter 3: Diagnostics 7156 Service Guide Align the hinges. Push down gently until the cover snaps into place. Close the receipt cover. Open the front cover and set the DIP switches back to the settings for normal operation (on-line mode).
Page 49: Running The Data Scope Mode
7156 Service Guide Chapter 3: Diagnostics 10. Close the front cover and press the On Line button (or plunger) on those models. The green LED flashes when the printer cycles. The settings are entered into EEROM. 11. Press the reset button (under the DIP switches) on those models to cycle the printer.
Page 50: Testing The Slip And Receipt Stations
Chapter 3: Diagnostics 7156 Service Guide Exit the Data Scope Mode Open the front cover and set the DIP switches to the following settings: Switch 7 is always Off. Switch 8: On = knife, Off = non-knife Switch 1 Switch 2...
Page 51 7156 Service Guide Chapter 3: Diagnostics Note: The operator panel may differ depending on the model. To put the printer on- or off-line, use a paper clip or other pointed object to depress the plunger (in place of the On Line button) on models with that item.
Page 52 Chapter 3: Diagnostics 7156 Service Guide On models with the On Line button (or plunger) on top of the printer, close the front cover and press the On Line button (or plunger). The green LED flashes when the printer cycles. The settings are entered into EEROM.
Page 53: Level 2 Diagnostics
7156 Service Guide Chapter 3: Diagnostics The green LED flashes when the printer cycles. The settings are entered into EEROM. The printer begins printing the sample receipt. Note: If the Sample Receipt Via Feed Button option is selected (see the DIP switch settings above), the printer stops printing after all the character sets have been printed.
Page 54: Running The Print Test By Power Cycling The Printer
Chapter 3: Diagnostics 7156 Service Guide variations of the character sets with a partial cut between each variation. See the samples on the following pages. The samples do not show the character sets. The tests end with a partial cut, then begin again. Several feet of paper can be used to print one pass of the test.
Page 55: Sample Print Test For Rs-232C Models
7156 Service Guide Chapter 3: Diagnostics Sample Print Test for RS-232C Models The character sets are not shown in the sample printout. September 1998...
Page 56: Sample Print Test For Lcsio (Rs-485) Models
Chapter 3: Diagnostics 7156 Service Guide Sample Print Test for LCSIO (RS-485) Models The character sets are not shown in the sample printout. September 1998...
Page 57: Troubleshooting
7156 Service Guide Chapter 4: Troubleshooting Chapter 4: Troubleshooting This chapter gives information on test points and Field Effect Transistors (FETs), and provides tables to help in determining the cause of printer malfunctions. Test Points Test points are located on the PC board and can be used to diagnose sensor and power failures.
Page 58: Field Effect Transistors (Fets)
Chapter 4: Troubleshooting 7156 Service Guide Field Effect Transistors (FETs) Common PC Board (Newer Printer Models) FETs are located on the PC board and can be used to diagnose motor, solenoid, and printhead problems. There are a maximum of 34 FETs located on the PC board: •...
Page 59: Rs-232C Pc Board (Older Models)
7156 Service Guide Chapter 4: Troubleshooting Note: The common PC board is used in newer 7156 models for both RS-232C and LCSIO (RS-485). The board has either a 9-pin connector for RS-232C (as shown) or a 15-pin connector for LCSIO (RS-485).
Page 60: Lcsio (Rs-485) Pc Board (Older Models)
Chapter 4: Troubleshooting 7156 Service Guide Impact Forms Comp Slip Feed Thermal Carriage Printhead Solenoid Motor Printhead Motor Knife MICR Solenoid Receipt Feed Motor Cash Drawer 1 & 2 LCSIO (RS-485) PC Board (Older Models) FETs are located on the PC board and can be used to diagnose motor, solenoid, and printhead problems.
Page 61: Mechanical Problems
7156 Service Guide Chapter 4: Troubleshooting Impact Forms Comp Slip Feed Thermal Carriage Printhead Solenoid Motor Printhead Motor Knife MICR Solenoid Receipt Feed Motor Mechanical Problems Problem Possible Causes What To Do Knife Does Not Operate Bad knife home switch.
Page 62 Chapter 4: Troubleshooting 7156 Service Guide Problem Possible Causes What To Do Printer Does Not Printer not plugged in. Confirm that printer cables are properly connected on both Function When ends. Make sure the ground wire is properly connected. See Turned On “Connecting the Cables”...
Page 63 7156 Service Guide Chapter 4: Troubleshooting Problem Possible Causes What To Do Carriage Homes Jammed carriage. Turn off the power to the printer and place the feed rolls in Incorrectly the down position. Move the carriage to see if the carriage moves freely.
Page 64: Printing Problems
(15 feet, ± 10 feet) of paper left.* *Note: The paper low sensor is not available on certain models. Check with your NCR sales representative to see if the printer has this feature. Problem Possible Causes...
Page 65 7156 Service Guide Chapter 4: Troubleshooting Problem Possible Causes What To Do Light Print in Impact Worn ribbon cassette. Check for wear in the ribbon cassette. Printing Platen gap too large. Check and adjust the platen gap (.018 inches). See chapter 5.
Page 66: Forms Feeding Problems
Chapter 4: Troubleshooting 7156 Service Guide Forms Feeding Problems Problem Possible Causes What To Do Forms Not Feeding Into Failed paper feed motor. Use the FETs test to see if the paper feed motor has failed. Impact Printer See “Field Effect Transistors (FETs)” in this chapter.
Page 67: Electronic Problems
7156 Service Guide Chapter 4: Troubleshooting Electronic Problems Problem Possible Causes What To Do Power Voltage too Improper connections in Check that connections in the printer are proper. See the Low/High printer. section in chapter 8 that applies to this unit’s PC board.
Page 68 Chapter 4: Troubleshooting 7156 Service Guide Check MICR head solenoid with an ohmmeter. Reading should show about 30 ohms. Note about the MICR check reader: The MICR feature has been factory adjusted for a normal operating environment. However, additional devices, such as CRT monitors, or large metal surfaces that are near the printer can affect the printer’s magnetic field,...
Page 69: Chapter 5: Adjustments
“Level 1 Diagnostics” in “Chapter 3: Diagnostics.” Adjusting the Paper Low Sensor Receipt Cutout Paper Low Cover Sensor Gauge Note: The paper low sensor is not available on certain models. Check with your NCR sales representative to see if the printer has this feature. September 1998...
Page 70 Chapter 5: Adjustments 7156 Service Guide The paper low sensor is set at the factory to detect when there are 4 ½ meters, ± 3 meters (15 feet, ± 10 feet), of receipt paper remaining. The sensor can be adjusted to detect less or more paper remaining.
Page 71: Adjusting The Platen Gap
7156 Service Guide Chapter 5: Adjustments Adjusting the Platen Gap Front Cover Printhead Platen Left Eccentric Screw MICR Magnet (MICR Option Only) Screw Right Eccentric Note: The hinge arm assembly (front cover) must be completely closed in order to adjust the platen gap.
Page 72 Chapter 5: Adjustments 7156 Service Guide September 1998...
Page 73: Chapter 6: Removing The Thermal Receipt Mechanism
In chapter 7 you will disassemble and reassemble the thermal receipt mechanism. In chapter 8 you will replace the thermal receipt mechanism on the printer. Note: Some 7156 models may appear slightly different than what is shown in the illustrations. The procedures are the same for all models unless otherwise noted.
Page 74: Removing The Receipt Cover
Chapter 6: Removing the Thermal Receipt Mechanism 7156 Service Guide Removing the Receipt Cover Silicone Fluid Paper Roll Receipt Cover September 1998...
Page 75 ESD protected work surface. Note: Some 7156 models may appear slightly different than what is shown in the illustrations. The procedures are the same for all models unless otherwise noted.
Page 76: Disassembling And Reassembling The Receipt Cover
Chapter 6: Removing the Thermal Receipt Mechanism 7156 Service Guide Disassembling and Reassembling the Receipt Cover Disassemble the receipt cover by removing the platen (only on non-knife models). Note: If you are changing the stationary knife blade, you must replace the entire receipt cover because the stationary knife blade cannot be removed from the receipt cover.
Page 77: Removing The Top Cover
Chapter 6: Removing the Thermal Receipt Mechanism Removing the Top Cover Note: Some 7156 models may appear slightly different than what is shown in the illustration. The procedures are the same for all models unless otherwise noted. Open the front cover.
Page 78: Disconnecting Cables From The Common Pc Board
Chapter 6: Removing the Thermal Receipt Mechanism 7156 Service Guide Disconnecting Cables from the Common PC Board The common PC board replaces older RS-232C and LCSIO (RS-485) PC boards. The board is populated differently for each interface. See “Removing the PC Board” in chapter 9 for more information.
Page 79 7156 Service Guide Chapter 6: Removing the Thermal Receipt Mechanism September 1998...
Page 80: Disconnecting Cables From The Older Rs-232C Pc Board
Chapter 6: Removing the Thermal Receipt Mechanism 7156 Service Guide Disconnecting Cables from the Older RS-232C PC Board Use these instructions to disconnect cables from the older RS-232C PC board. This board is replaced by the common PC board. See “Disconnecting Cables from the Common PC board”...
Page 81 7156 Service Guide Chapter 6: Removing the Thermal Receipt Mechanism September 1998...
Page 82: Disconnecting Cables From The Older Lcsio (Rs-485) Pc Board
Chapter 6: Removing the Thermal Receipt Mechanism 7156 Service Guide Disconnecting Cables from the Older LCSIO (RS-485) PC Board Use these instructions to disconnect cables from the older LCSIO (RS-485) PC board. This board is replaced by the common PC board. See “Disconnecting Cables from the Enhanced Common PC board”...
Page 83 7156 Service Guide Chapter 6: Removing the Thermal Receipt Mechanism MICR Thermal Printhead Assembly Frame Ground September 1998...
Page 84: Removing The Thermal Receipt Mechanism
Chapter 6: Removing the Thermal Receipt Mechanism 7156 Service Guide Removing the Thermal Receipt Mechanism Thermal Receipt Mechanism Screw Front Cover Thermal Mount Rear Latches Open the front cover. Loosen the screw, in front of the thermal receipt mechanism, which holds it on the thermal mount.
Page 85: Chapter 7: Disassembling And Reassembling The Thermal Receipt Mechanism
See chapter 6 for detailed information on removing the thermal receipt mechanism. In chapter 8 you will replace the thermal receipt mechanism on the printer. Note: Some 7156 models may appear slightly different than what is shown in the illustration. The procedures are the same for all models unless otherwise noted.
Page 86: Thermal Printhead
Chapter 7: Disassembling and Reassembling the Thermal Receipt Mechanism 7156 Service Guide Thermal Printhead Removing the Printhead Frame Rotating Blade Printhead Cable Knife Ground Strap Left Support Printhead Spring Printhead Assembly Caution: Electro Static Discharge may damage the PC board. Wear a grounded wrist strap and use a static mat or other ESD protected work surface whenever you work with the PC board.
Page 87: Replacing The Printhead
7156 Service Guide Chapter 7: Disassembling and Reassembling the Thermal Receipt Mechanism Replacing the Printhead The mechanism should be facing you with the printhead area toward you. See the illustration on the previous page. Note: Take note of the character (A-D, 0-3; or A-H) stamped on the heat sink (the part of the printhead which faces the front of the printer).
Page 88: Knife Assembly
Chapter 7: Disassembling and Reassembling the Thermal Receipt Mechanism 7156 Service Guide Knife Assembly The knife assembly is optional and is not present in all printers. Removing the Knife Assembly Receipt Cover Rotating Blade Screw Knife Drive Knife Ground Strap...
Page 89: Replacing The Knife Assembly
7156 Service Guide Chapter 7: Disassembling and Reassembling the Thermal Receipt Mechanism Note: If you are replacing the rotating blade, you must change all parts contained in the knife kit. Remove the knife home switch assembly. Remove the set screw and knife actuator arm.
Page 90: Knife Motor
Chapter 7: Disassembling and Reassembling the Thermal Receipt Mechanism 7156 Service Guide Knife Motor The knife assembly is optional and is not present on all printers. Removing the Knife Motor Knife Motor Remove the two screws and washers holding the knife motor.
Page 91: Switches
7156 Service Guide Chapter 7: Disassembling and Reassembling the Thermal Receipt Mechanism Switches Removing the Switches Knife Home Switch Knife Cover Motor Open Switch Retaining Plate Paper Out Switch Note: The knife motor must be removed before the paper out switch can be removed.
Page 92: Replacing The Switches
Chapter 7: Disassembling and Reassembling the Thermal Receipt Mechanism 7156 Service Guide Replacing the Switches See the illustration on the previous page. For each switch, reattach the faston terminals on the harness to the rearmost spade on the switch. Replace the paper out switch in its proper position under the paper path area and insert the screwdriver through the knife motor mounting hole and replace the mounting screw, washer, and retaining plate.
Page 93: Paper Low Sensor
Paper Low Rivets Sensor Note: The paper low sensor is not available on certain models. Check with your NCR sales representative to see if the printer has this feature. Remove the screws holding the sensor assembly to the print mechanism.
Page 94: Paper Feed Motor
Chapter 7: Disassembling and Reassembling the Thermal Receipt Mechanism 7156 Service Guide Paper Feed Motor Removing the Paper Feed Motor Paper Feed Motor Note: Order the paper feed motor kit if you are replacing the paper feed motor. The kit contains the paper feed motor, two washers, and two screws.
Page 95: Chapter 8: Replacing The Thermal Receipt Mechanism
7 for detailed information on disassembling and reassembling the thermal receipt mechanism. Note: Some 7156 models may appear slightly different than what is shown in the illustration. The procedures are the same for all models unless otherwise noted.
Page 96: Replacing The Thermal Receipt Mechanism
Chapter 8: Replacing the Thermal Receipt Mechanism 7156 Service Guide Replacing the Thermal Receipt Mechanism Thermal Receipt Mechanism Screw Front Cover Thermal Mount Rear Latches September 1998...
Page 97 7156 Service Guide Chapter 8: Replacing the Thermal Receipt Mechanism Note: Before positioning the thermal receipt mechanism on the thermal mount, write down the letter on the label on the back of the printhead. You may need to reset the thermal printhead resistance after replacing the thermal receipt mechanism.
Page 98: Reconnecting Cables To The Common Pc Board
Chapter 8: Replacing the Thermal Receipt Mechanism 7156 Service Guide Reconnecting Cables to the Common PC Board The common PC board replaces both the RS-232C and the LCSIO (RS-485) PC boards. The board is populated differently for each interface. See “Removing the PC Board” in chapter 9 for more information.
Page 99 7156 Service Guide Chapter 8: Replacing the Thermal Receipt Mechanism September 1998...
Page 100: Reconnecting Cables To The Older Rs-232C Pc Board
Chapter 8: Replacing the Thermal Receipt Mechanism 7156 Service Guide Reconnecting Cables to the Older RS-232C PC Board This board is the older RS-232C PC board. It is replaced by the common PC board. See “Reconnecting Cables to the Common PC board” earlier in this chapter and “Removing the PC Board”...
Page 101 7156 Service Guide Chapter 8: Replacing the Thermal Receipt Mechanism September 1998...
Page 102: Reconnecting Cables To The Older Lcsio (Rs-485) Pc Board
Chapter 8: Replacing the Thermal Receipt Mechanism 7156 Service Guide Reconnecting Cables to the Older LCSIO (RS-485) PC Board This board is the older LCSIO (RS-485) PC board. It is replaced by the common PC board. See “Reconnecting Cables to the Common PC board” earlier in this chapter and “Removing the PC Board”...
Page 103 7156 Service Guide Chapter 8: Replacing the Thermal Receipt Mechanism MICR Thermal Printhead Assembly Frame Ground September 1998...
Page 104: Replacing The Top Cover
Rear Corner Note: Some 7156 models may appear slightly different than what is shown in the illustration. The procedures are the same for all models unless otherwise noted. With the front cover partially closed (not latched), position the top cover over the printer and PC board.
Page 105: Replacing The Receipt Cover
7156 Service Guide Chapter 8: Replacing the Thermal Receipt Mechanism Replacing the Receipt Cover Silicone Fluid Paper Roll Receipt Cover Hold the receipt cover vertically over the hinge brackets in the printer cabinet and align the hinges. Push down gently until the cover snaps into place.
Page 106 Chapter 8: Replacing the Thermal Receipt Mechanism 7156 Service Guide Note: After reassembling the thermal receipt mechanism, you may need to reset the thermal printhead resistance and the partial cut distance. See “Setting Printhead Resistance” and “Setting Partial Cut Distance” in “Chapter 3: Diagnostics.”...
Page 107: Section Three: Print Mechanism
7156 Service Guide Section Three: Print Mechanism Section Three: Print Mechanism • Chapter 9: Removing the Print Mechanism • Preparation • Removing the Sensor Bracket • Removing the PC Board • Removing the Thermal Mount • Removing the Hinge Arm Assembly •...
Page 109: Chapter 9: Removing The Print Mechanism
In chapter 14 you will replace the print mechanism in the printer. Note: Some 7156 models may appear slightly different than what is shown in the illustrations. The procedures are the same for all models unless otherwise noted. Tools You will need the following tools and lubricants: •...
Page 110: Preparation
Chapter 9: Removing the Print Mechanism 7156 Service Guide Preparation Caution: Before working on the printer be sure that the power has been turned off. Wear a grounded wrist strap and use a static mat or other ESD protected work surface.
Page 111: Removing The Sensor Bracket
7156 Service Guide Chapter 9: Removing the Print Mechanism Removing the Sensor Bracket LED Sensor Sensor Cable Bracket Connector Screw Cantilever Latch Caution: Electro Static Discharge may damage the PC board. Wear a grounded wrist strap and use a static mat or other ESD protected work surface whenever you work with the PC board.
Page 112: Removing The Pc Board
Chapter 9: Removing the Print Mechanism 7156 Service Guide Removing the PC Board Electronics Assembly PCB Shield Cantilever Screw September 1998...
Page 113 7156 Service Guide Chapter 9: Removing the Print Mechanism If you are removing the PC board because of a failure, read the following information. If you are removing the PC board in order to remove or replace another item, go directly to step 1.
Page 114: Removing The Thermal Mount
Chapter 9: Removing the Print Mechanism 7156 Service Guide Removing the Thermal Mount Thermal Mount Print Mechanism Screws Base Torx® Ground Screws Clip Unscrew the three Torx® screws on the front of the print mechanism. Unscrew the two screws on the right side of the thermal mount.
Page 115: Removing The Hinge Arm Assembly
7156 Service Guide Chapter 9: Removing the Print Mechanism Removing the Hinge Arm Assembly Front Cover Ribbon Cassette Torsion Spring Extension Spring Carriage Drive Mechanism Open the hinge arm assembly and remove the extension spring connecting the hinge arm assembly to the right side of the carriage drive mechanism.
Page 116: Removing The Micr Amplifier Board: Lcsio (Rs-485) Models
Chapter 9: Removing the Print Mechanism 7156 Service Guide Removing the MICR Amplifier Board: LCSIO (RS-485) Models MICR Amplifier Assembly Board LC Chip Interconnect Connector J1 Read Head Harness Solenoid J1 Buck Coil Connector Connector Amplifier Board Print Mechanism Interconnect...
Page 117 7156 Service Guide Chapter 9: Removing the Print Mechanism If you are removing the MICR amplifier board because of a failure, read the following information. If you are removing the MICR amplifier board in order to remove or replace another item, go directly to step 1. Be sure to read the Caution first.
Page 118: September 1998
Chapter 9: Removing the Print Mechanism 7156 Service Guide Removing the Print Mechanism Screw w/Washer Screw w/Washer Print Mechanism Buck Read Coil Head Harness Harness MICR Solenoid Harness Base Solenoid Motor Wires Harness Open the wire clip retainers on the cantilever and in the base and remove the wires.
Page 119: Chapter 10: Hinge Arm Assembly And Sensor Bracket
7156 Service Guide Chapter 10: Hinge Arm Assembly and Sensor Bracket Chapter 10: Hinge Arm Assembly and Sensor Bracket This is the second of six related chapters which deal with the print mechanism. In this chapter you will disassemble and reassemble the hinge arm assembly (front cover) and the sensor bracket.
Page 120: Disassembling The Hinge Arm Assembly
Chapter 10: Hinge Arm Assembly and Sensor Bracket 7156 Service Guide Disassembling the Hinge Arm Assembly Hinge Assembly Screw Pressure Roll Bearing Screw E-ring Gear Pressure Roll Assembly Front Cover Orientation of the hinge arm assembly for this procedure is upside-down with the gear on the left and the pressure roll assembly toward you.
Page 121: Reassembling The Hinge Arm Assembly
7156 Service Guide Chapter 10: Hinge Arm Assembly and Sensor Bracket Reassembling the Hinge Arm Assembly Orientation of the hinge arm assembly for this procedure is upside-down with the gears of the pressure roll assembly to the left and front. See the illustration on the previous page.
Page 122: Disassembling The Sensor Bracket
Chapter 10: Hinge Arm Assembly and Sensor Bracket 7156 Service Guide Disassembling the Sensor Bracket Sonsor Bracket Light Pipe LED Sensor Cable Assembly Remove the light pipe by pushing the arm of the light pipe forward and pulling the light pipe up and off the sensor bracket.
Page 123: Chapter 11: Micr Assembly
7156 Service Guide Chapter 11: MICR Assembly Chapter 11: MICR Assembly This is the third of six related chapters which deal with the print mechanism. In this chapter you will remove and replace the MICR assembly on the print mechanism.
Page 124: Removing The Micr Assembly From The Print Mechanism
Harness Loop Solenoid Note: Some 7156 models may appear slightly different than the illustration which represents the latest version. The procedures are the same for all models unless otherwise noted. All new MICR assembly parts replace old parts. September 1998...
Page 125: Removing The Micr Bracket Assembly
7156 Service Guide Chapter 11: MICR Assembly Removing the MICR Bracket Assembly Note: On certain LCSIO (RS-485) models an extender cable (available in a kit) is used to connect the MICR solenoid cable to the common PC board. Disconnect the MICR solenoid cable from the PC board.
Page 126: Replacing The Micr Assembly On The Print Mechanism
Chapter 11: MICR Assembly 7156 Service Guide Replacing the MICR Assembly on the Print Mechanism Replacing the Buck Coil Assembly Place the buck coil assembly into the slot on the cantilever and rotate it until it snaps into place. Replace and tighten the screw holding the buck coil assembly and the ground strap to the cantilever.
Page 127: Chapter 12: Carriage Assembly
7156 Service Guide Chapter 12: Carriage Assembly Chapter 12: Carriage Assembly This is the fourth of six related chapters which deal with the print mechanism. In this chapter you will remove the carriage assembly from the print mechanism, disassemble and reassemble the carriage assembly, and replace it on the print mechanism.
Page 128: Removing The Carriage Assembly From The Print Mechanism
Chapter 12: Carriage Assembly 7156 Service Guide Removing the Carriage Assembly from the Print Mechanism Printhead Carriage Lock Cable Shaft Washer Screw L-bracket Screw Timing Belt Molykote DX Paste Cantilever Anti-rotation Bearing Carriage L-bracket Shaft Screw Cassette Drive Rack & L-Bracket...
Page 129: Disassembling The Carriage Assembly
7156 Service Guide Chapter 12: Carriage Assembly Remove the printhead cable from the strain relief on the top of the cantilever. Disassembling the Carriage Assembly Orientation of the carriage assembly is with the gears to the front and top. Note: See the Parts Information Manual for more information about the carriage kit.
Page 130: Reassembling The Carriage Assembly
Chapter 12: Carriage Assembly 7156 Service Guide Note: The groundstrap on the printhead remains on the printhead. If you are replacing the printhead, use the groundstrap from the old printhead. Remove the ribbon idler gear (the gear with a flat surface) on the right side of the carriage assembly.
Page 131: Replacing The Carriage Assembly On The Print Mechanism
7156 Service Guide Chapter 12: Carriage Assembly 11. Flip the top of the folded portion of the cable into the tab at the top and back part of the carriage assembly. Replacing the Carriage Assembly on the Print Mechanism Orientation of the print mechanism is with the cantilever side extending forward and the drive plate assembly to the back.
Page 132 Chapter 12: Carriage Assembly 7156 Service Guide g. Loop the cable back around and thread the cable through the strain relief. Replace the timing belt on the drive plate assembly by pushing on the pulley gear (tensioner) and pulling the timing belt over and off the pulley gear.
Page 133: Chapter 13: Drive Plate Assembly
7156 Service Guide Chapter 13: Drive Plate Assembly Chapter 13: Drive Plate Assembly This is the fifth of six related chapters which deal with the print mechanism. In this chapter you will remove the drive plate assembly from the print mechanism, disassemble and reassemble the drive plate assembly, and replace the drive plate assembly on the print mechanism.
Page 134: Removing The Drive Plate Assembly From The Print Mechanism
Chapter 13: Drive Plate Assembly 7156 Service Guide Removing the Drive Plate Assembly from the Print Mechanism Grommet Pins Pulley Gear (Tensioner) Drive Plate Assembly Carriage Assembly Orientation for removing the drive plate assembly from the print mechanism is with the carriage assembly facing you and the drive plate assembly to the back.
Page 135: Disassembling The Drive Plate Assembly
7156 Service Guide Chapter 13: Drive Plate Assembly Pull back on the whole drive plate assembly to pull it off the top of the cantilever. Pull up on the whole drive assembly to remove the bottom of the drive plate assembly from the cantilever.
Page 136 Chapter 13: Drive Plate Assembly 7156 Service Guide Pulley E-ring Flange Right Grommet E-ring Timing Wheel Pulley Gear and Bearing Home Interrupt Flag Sensor Assembly Silicone Silicone Motor Fluid Fluid Torsion Spring Timing Belt Motor Pulley E-ring Flange Pulley Gear...
Page 137: Reassembling The Drive Plate Assembly
7156 Service Guide Chapter 13: Drive Plate Assembly Reassembling the Drive Plate Assembly Orientation for the reassembly of the drive plate assembly is with the assembly upside down with the motor shaft on the right. See the illustration on the previous page to aid in reassembling the drive plate assembly.
Page 138: Replacing The Drive Plate Assembly On The Print Mechanism
Chapter 13: Drive Plate Assembly 7156 Service Guide Replace the interrupt sensor assembly. Slide the interrupt sensor assembly into place on the drive plate. b. From underneath the drive plate assembly, push the pin head of the snap rivet and the snap rivet through the hole that is to the right of the interrupt sensor assembly (use a new rivet pin if the old one is damaged).
Page 139: Chapter 14: Replacing The Print Mechanism
This is the sixth of six related chapters which deal with the print mechanism. In this chapter you will replace the print mechanism in the printer. Note: Some 7156 models may appear slightly different than what is shown in the illustrations. The procedures are the same for all models unless otherwise noted.
Page 140: Replacing The Print Mechanism
Chapter 14: Replacing the Print Mechanism 7156 Service Guide Replacing the Print Mechanism Screw w/Washer Screw w/Washer Print Mechanism Buck Read Coil Head Harness Harness MICR Solenoid Harness Base Solenoid Motor Wires Harness September 1998...
Page 141 7156 Service Guide Chapter 14: Replacing the Print Mechanism Orientation of the print mechanism when replacing it in the printer is with the carriage assembly facing you and the drive plate assembly to the back. Caution: Do not force the print mechanism into the printer base or damage may occur to the printer.
Page 142: Replacing The Micr Amplifier Board: Lcsio (Rs-485) Models
Chapter 14: Replacing the Print Mechanism 7156 Service Guide Replacing the MICR Amplifier Board: LCSIO (RS-485) Models MICR Amplifier Assembly Board LC Chip Interconnect Connector J1 Read Head Harness Solenoid J1 Buck Coil Connector Connector Amplifier Board Print Mechanism Interconnect...
Page 143 7156 Service Guide Chapter 14: Replacing the Print Mechanism You must use three extender cables (available in a kit) to connect the following three cables to the common PC board: • MICR Read Head Cable • MICR Buckhead Cable •...
Page 144: Replacing The Hinge Arm Assembly
Chapter 14: Replacing the Print Mechanism 7156 Service Guide Replacing the Hinge Arm Assembly Front Cover Ribbon Cassette Torsion Spring Extension Spring Carriage Drive Mechanism Position the hinges of the hinge arm assembly (front cover) on the brackets of the cantilever.
Page 145: Replacing The Thermal Mount
7156 Service Guide Chapter 14: Replacing the Print Mechanism Replacing the Thermal Mount Thermal Mount Print Mechanism Screws Base Torx® Ground Screws Clip Position the thermal mount on the base and on the cantilever. Screw in the two screws holding the thermal mount to the base.
Page 146: Replacing The Pc Board
Chapter 14: Replacing the Print Mechanism 7156 Service Guide Replacing the PC Board Motor Three Connector Wires Buck Coil Mount Screw Cord Keep Wires Motor Harness Cord Keeps Interconnect Harness September 1998...
Page 147 7156 Service Guide Chapter 14: Replacing the Print Mechanism Note: This wiring is required only on older PC boards. If you are replacing the PC board because of a failure, read the following information. If you are putting the PC board back in after removing or replacing another item, go directly to step 1.
Page 148: Enhanced Common Pc Board Connectors
Chapter 14: Replacing the Print Mechanism 7156 Service Guide Enhanced Common PC Board Connectors September 1998...
Page 149: Rs-232C Pc Board Connectors
7156 Service Guide Chapter 14: Replacing the Print Mechanism RS-232C PC Board Connectors September 1998...
Page 150: Lcsio (Rs-485) Pc Board Connectors
Chapter 14: Replacing the Print Mechanism 7156 Service Guide LCSIO (RS-485) PC Board Connectors MICR Thermal Printhead Assembly Frame Ground September 1998...
Page 151: Adjusting The Platen Gap
7156 Service Guide Chapter 14: Replacing the Print Mechanism Adjusting the Platen Gap Front Cover Printhead Platen Left Eccentric Screw MICR Magnet (MICR Option Only) Screw Right Eccentric Note: The hinge arm assembly (front cover) must be completely closed in order to adjust the platen gap.
Page 152: Adjusting The Micr Check Reader
Chapter 14: Replacing the Print Mechanism 7156 Service Guide Adjusting the MICR Check Reader Anytime the print mechanism has been removed or disassembled, the Magnetic Ink Character Recognition (MICR) check reader must be adjusted. See the following two sections in “Chapter 3: Diagnostics” for adjusting the MICR check reader: •...
Page 153: Section Four: Base Feed Assembly
7156 Service Guide Section Four: Base Feed Assembly Section Four: Base Feed Assembly • Chapter 15: Removing the Base/Feed Mechanism • Preparation • Separating Mechanisms from the Base/Feed Mechanism • Chapter 16: Forms Compensation Arm Assembly • Removing the Forms Compensation Arm Assembly •...
Page 155: Chapter 15: Removing The Base/Feed Mechanism
7156 Service Guide Chapter 15: Removing the Base/Feed Mechanism Chapter 15: Removing the Base/Feed Mechanism This is the first of six related chapters which deal with the base/feed mechanism. In this chapter you will separate mechanisms from the base/feed mechanism.
Page 156: Preparation
Chapter 15: Removing the Base/Feed Mechanism 7156 Service Guide Preparation Caution: Before working on the printer be sure that the power has been turned off. Wear a grounded wrist strap and use a static mat or other ESD protected work surface.
Page 157: Separating Mechanisms From The Base/Feed Mechanism
7156 Service Guide Chapter 15: Removing the Base/Feed Mechanism Separating Mechanisms from the Base/Feed Mechanism Forms Guide Assembly Forms Compensation Arm Assembly Solenoid and Pivot Arm Assemblies Paper Feed Motor Assembly Caution: Electro Static Discharge may damage the PC board. Wear a grounded wrist strap and use a static mat or other ESD protected work surface whenever you work with the PC board.
Page 158 Chapter 15: Removing the Base/Feed Mechanism 7156 Service Guide September 1998...
Page 159: Chapter 16: Forms Compensation Arm Assembly
7156 Service Guide Chapter 16: Forms Compensation Arm Assembly Chapter 16: Forms Compensation Arm Assembly This is the second of six related chapters which deal with the base/feed mechanism. In this chapter you will remove, disassemble, reassemble and replace the forms compensation arm assembly.
Page 160: Removing The Forms Compensation Arm Assembly
Chapter 16: Forms Compensation Arm Assembly 7156 Service Guide Removing the Forms Compensation Arm Assembly Forms Pivot Arm Compensation Shaft Compression Spring Compression Spring Pivot Arm Assembly Raise the forms compensation arm assembly by pulling up the pivot arm shaft to place the platen in the raised position.
Page 161: Disassembling The Forms Compensation Arm Assembly
7156 Service Guide Chapter 16: Forms Compensation Arm Assembly Disassembling the Forms Compensation Arm Assembly E-ring Bottom Feed Roll Assembly Pivot Arm Shaft Silicone Forms Fluid Compensation Adjusting Eccentric Right Torx® Screw Washer Silicone Eccentric Fluid Spring Retaining Washer Ring...
Page 162: Reassembling The Forms Compensation Arm Assembly
Chapter 16: Forms Compensation Arm Assembly 7156 Service Guide Orientation for disassembling the forms compensation arm assembly is with the gears of the bottom feed roll assembly on your right and the pivot arm shaft toward you and to the top.
Page 163: Replacing The Forms Compensation Arm Assembly In The Base
7156 Service Guide Chapter 16: Forms Compensation Arm Assembly Replace the bottom feed roll shaft by sliding the left side of the shaft into the left side slot and then snapping the right side of the shaft into place on the forms compensation arm assembly.
Page 164 Chapter 16: Forms Compensation Arm Assembly 7156 Service Guide September 1998...
Page 165: Chapter 17: Forms Guide Assembly
7156 Service Guide Chapter 17: Forms Guide Assembly Chapter 17: Forms Guide Assembly This is the third of six related chapters which deal with the base/feed mechanism. In this chapter you will remove, disassemble, reassemble, and replace the forms guide assembly.
Page 166: Removing The Forms Guide Assembly
Pivot Solenoid Note: Some 7156 models may appear slightly different than what is shown in the illustration. The procedures are the same for all models unless otherwise noted. Note: You cannot remove the forms guide assembly until the forms compensation arm assembly has been removed.
Page 167: Disassembling The Forms Guide Assembly
7156 Service Guide Chapter 17: Forms Guide Assembly Disassembling the Forms Guide Assembly Torsion Spring Stop Forms Guide Slip Sensor Assembly Disconnect the torsion spring from the arm stop and the snap leg on the forms guide. Remove the stop arm from the forms guide.
Page 168: Replacing The Forms Guide Assembly In The Base
Assembly Wires Note: Some 7156 models may appear slightly different than what is shown in the illustration. The procedures are the same for all models unless otherwise noted. The forms guide assembly cannot be replaced in the base unless the solenoid assembly and pivot arm assembly are in place.
Page 169: Chapter 18: Solenoid And Pivot Arm Assemblies
7156 Service Guide Chapter 18: Solenoid and Pivot Arm Assemblies Chapter 18: Solenoid and Pivot Arm Assemblies This is the fourth of six related chapters which deal with the base/feed mechanism. In this chapter you will remove and replace the solenoid and you will remove, disassemble, reassemble and replace the pivot arm assembly.
Page 170: Removing The Solenoid And The Pivot Arm Assembly
Chapter 18: Solenoid and Pivot Arm Assemblies 7156 Service Guide Removing the Solenoid and the Pivot Arm Assembly Solenoid Solenoid Plunger Forms Stop Pivot Arm Clevis Solenoid Pull-link Pivot Clevis Pivot Arm Pin Note: The solenoid and pivot arm assembly cannot be removed until the forms guide assembly and the forms compensation arm assembly have been removed.
Page 171: Disassembling The Pivot Arm Assembly
7156 Service Guide Chapter 18: Solenoid and Pivot Arm Assemblies Removing the Solenoid Orientation for removing the solenoid assembly is with the paper feed motor to the right and front of the base. Caution: Keep the solenoid away from the PC board. The solenoid is magnetic and can damage the PC board.
Page 172 Chapter 18: Solenoid and Pivot Arm Assemblies 7156 Service Guide September 1998...
Page 173: Chapter 19: Paper Feed Motor Assembly
7156 Service Guide Chapter 19: Paper Feed Motor Assembly Chapter 19: Paper Feed Motor Assembly This is the fifth of six related chapters which deal with the base/feed mechanism. In this chapter you will remove and replace the paper feed motor assembly.
Page 174: Removing The Paper Feed Motor Assembly
Chapter 19: Paper Feed Motor Assembly 7156 Service Guide Removing the Paper Feed Motor Assembly Paper Feed Motor Asembly Tabs Remove the paper feed motor assembly by unsnapping the tabs from underneath. Press back the tabs at the top of the motor.
Page 175: Chapter 20: Replacing Mechanisms In The Base/Feed Mechanism
7156 Service Guide Chapter 20: Replacing Mechanisms in the Base/Feed Mechanism Chapter 20: Replacing Mechanisms in the Base/Feed Mechanism This is the sixth of six related chapters which deal with the base/feed mechanism. In this chapter you will replace mechanisms and assemblies in the base/feed mechanism to reassemble the printer.
Page 176: Reassembling Mechanisms In The Base Assembly
Chapter 20: Replacing Mechanisms in the Base/Feed Mechanism 7156 Service Guide Reassembling Mechanisms in the Base Assembly Note: The paper feed motor, solenoid & pivot arm assemblies, forms guide assembly and the forms compensation assembly must be assembled in the base before mechanisms can be replaced in the printer.
Page 177: Section Five: Appendixes
7156 Service Guide Section Five: Appendixes Section Five: Appendixes There are four appendixes in this section which include the following information: • Appendix A: Printer Specifications • Print Specifications: Both Stations • Slip Station Specifications • Power Requirements • Environmental Requirements •...
Page 179: Appendix A: Printer Specifications
7156 Service Guide Appendix A: Printer Specifications Appendix A: Printer Specifications Print Specifications: Both Stations Thermal Receipt Station Slip Station Printhead Fixed Bi-directional 448 Print Elements Logic Seeking Direct Thermal Serial Dot Matrix Fixed Head Ribbon Cassette Line of Dots...
Page 180: Slip Station Specifications
Note: Margin measurements apply to forms inserted from both front and side. Power Requirements The 7156 printer receives power either from a host computer (integrated) or from a separate in-line power supply (remote) which can be purchased separately. Models receiving power from the host computer use one cable for both communication and power.
Page 181: Power From Power Supply
7156 Service Guide Appendix A: Printer Specifications Power from Power Supply The power supply must provide a +24V line of power to the printer, which must be regulated ± 5% at the printer. Surge protection must be provided. To do this, place a 2.0 Ampere time delay fuse on the +24V line.
Page 182: Dimensions And Weight
Appendix A: Printer Specifications 7156 Service Guide Dimensions and Weight Height 178 mm (7.0 Inches) Height with Cover Open 280 mm (11.0 Inches) Width 229 mm (9.0 Inches) Depth 264 mm (10.4 Inches) Depth with Extended Slip Table 347 mm (13.7 Inches) Weight 4.6 Kg (10.1 Pounds), Non-MICR,...
Page 183: Appendix B: Communication Information
7156 Service Guide Appendix B: Communication Information Appendix B: Communication Information RS-232C Connectors RS-232C Power Cable Connector Cash Drawer Connector and Pin Assignments Pin 1 Pin 6 Pin Number Cash Drawer 1 Connector Cash Drawer 2 Connector Frame Ground Frame Ground...
Page 184: Rs-232C Communication Connector Pin Assignments
Appendix B: Communication Information 7156 Service Guide RS-232C Communication Connector Pin Assignments RS-232C 25-Pin to 9-Pin Cable Diagram Note: This information is provided for testing and troubleshooting only. September 1998...
Page 185: Rs-232C 9-Pin To 9-Pin Cable Diagram
7156 Service Guide Appendix B: Communication Information RS-232C 9-Pin to 9-Pin Cable Diagram Note: This information is provided for testing and troubleshooting only. LCSIO (RS-485) Connector and Pin Assignments Pin Numbers Function Function 24 Volts 24 Volts 24 Volts Power Ground...
Page 186: Dip Switch Settings
Appendix B: Communication Information 7156 Service Guide DIP Switch Settings The DIP switches are located on the PC board behind the front cover. They are used to set the RS-232C parameters and LCSIO (RS-485) address bits as shown in the following tables.
Page 187: Lcsio (Rs-485) Switch Settings
7156 Service Guide Appendix B: Communication Information Note: The following options are set with the printer in the setup mode. See “Level 1 Diagnostics” in the “Diagnostics” chapter for more information. DIP Switch Settings for Data Error and Data Buffer Options (Choose one from each option)
Page 188: Commands
TM-T80™ Thermal printer, and the Epson TM-930™ Thermal printer. You may select from any of the commands to program a host computer to communicate with the 7156 printer. Some commands listed and described here are not implemented in the 7156 (they are identified as not implemented).
Page 189 7156 Service Guide Appendix B: Communication Information Printer Function Commands Hexadecimal Code Command Partial Knife Cut 1B 6D 1B 07 Generate Tone 1B 14 n Set Column 1B 20 n Set Character Right-Side Spacing (Not Implemented) 1B 24 etc. Set Absolute Starting Position...
Page 190: Print Characteristics Commands
Appendix B: Communication Information 7156 Service Guide Printer Function Commands Hexadecimal Code Command Receipt Station commands in chapter 6 of the Owner’s Guide. Print Characteristics Commands These commands control what the printed information looks like and are listed in numerical order of their hexadecimaladecimal codes.
Page 191: Graphics Commands
Transmit Printer ID 1D 61 Enable/Disable Automatic Status Back 1D 72 Transmit Status Real Time Commands These commands correct difficulties with the original version of the 7156 RS-232C communication interface. Real Time Commands Hexadecimal Code Command 1D 04 n Real Time Status Transmission, GS Sequence...
Page 192: Bar Code Commands
Appendix B: Communication Information 7156 Service Guide Bar Code Commands These commands print bar codes on the receipt station and are listed in numerical order of their hexadecimal codes. HRI means Human Readable Interface. Bar Code Commands Hexadecimal Code Command...
Page 193: Appendix C: Common Pc Board And Extender Cables
7156 Service Guide Appendix C: Common PC Board and Extender Cables Appendix C: Common PC Board and Extender Cables The common PC board replaces the older RS-232C and the older LCSIO (RS-485) PC boards. When the common PC board replaces the LCSIO (RS-485) PC board with the MICR check reader option, the MICR amplifier board must also be removed.
Page 194 Appendix C: Common PC Board and Extender Cables 7156 Service Guide Amplifier Board Interconnect Cable Read Head Extender Cable Read Head Buck Coil Connector Extender Cable MICR Solenoid Extender Cable Motor Connector Buck Coil Connector Solenoid Connector Connect the MICR read head cable, the MICR buck coil cable, and the MICR Solenoid cable to the common PC board with the three extender cables.
Page 195: Appendix D: Ordering Paper And Supplies
Miamisburg, OH 45342 Voice: 1(800)543-8130 (toll free), or local listing of Media Products sales office Ordering Forms The 7156 prints on single- or multiple-part forms in the slip station (up to five-part forms). Forms and slips must meet the following requirements: •...
Page 196: Ordering Ribbon Cassettes
Appendix D: Ordering Paper and Supplies 7156 Service Guide To order forms, contact your sales representative or order from NCR at the following address or toll free number: Media Products Division 9995 Washington Church Road Miamisburg, OH 45342 Voice: 1(800)543-8130 (toll free), or local listing of Media Products sales office...
Page 197: Ordering Documentation
Appendix D: Ordering Paper and Supplies Ordering Documentation Contact your sales representative to order the following documentation: • 7156 Thermal Receipt and Impact Slip Printer: Setup and User’s Guide (BD20-1435-A) • 7156 Thermal Receipt and Impact Slip Printer: Service Guide (BD20-1437-A)
Page 198: September
Appendix D: Ordering Paper and Supplies 7156 Service Guide September 1998...
Page 199: Index
7156 Service Guide Index Index —7— 7156 printer Carriage assembly adjustments, 53 disassembling, 115 clearance, 11 reassembling, 116 dimensions, 11, 168 removing, 114 environmental requirements, 167 replacing, 117 features, 4 Carriage return installation, 7 ignoring/using, 26 location, 10 Cash drawer...
Page 200 Index 7156 Service Guide —D— Forms guide assembly Data scope mode, 35 disassembling, 153 Density, of print, 168 reassembling, 153 Diagnostics, 21 removing, 152 level 0, 21 replacing, 154 level 1, 22 level 2, 39 —H— level 3, 39 print tests, 39...
Page 201: Index
7156 Service Guide Index Level 0 diagnostics, 21 Level 1 diagnostics, 22 —O— data scope mode, 35 Operator panel, 39 ignoring/using carriage return, 26 Options, 5 MICR check reader, 27, 30 Ordering MICR check reader (amplifier board), 30 cash drawer, 182...
Page 202: Index
Index 7156 Service Guide Platen removing, 62 Reliability, 167 replacing, 62 Repacking the printer, 9 Platen gap Ribbon cassette adjusting, 55, 137 not functioning, 49 Power ordering, 182 applying to printer, 15 RS-232C cables power voltage too low/high, 51 connecting, 12...
Page 203: Index
7156 Service Guide Index carriage homes incorrectly, 48 FETs, 44 forms catching, 51 —T— forms not feeding, 50 Test points, 43 forms skewing, 50 Testing the printer, 15, 39 knife does not operate, 47 Thermal mount LED doesn’t come on, 51...
Page 204: Index
Index 7156 Service Guide September 1998...
Page 206 BD20-1437-A Issue B 0998 NCR is the name and mark of NCR Corporation © 1997, 1998 NCR Corporation Printed in U.S.A.

NCR 7156 Service Manual

Chapter 1: About the 7156 Printer

Chapter 2: Setting up the Printer

Chapter 3: Diagnostics

Chapter 4: Troubleshooting

Chapter 5: Adjustments

Chapter 6: Removing the Thermal Receipt Mechanism

Chapter 7: Disassembling and Reassembling the Thermal Receipt Mechanism

Chapter 8: Replacing the Thermal Receipt Mechanism

Chapter 9: Removing the Print Mechanism

Chapter 10: Hinge Arm Assembly and Sensor Bracket

Chapter 11: MICR Assembly

Chapter 12: Carriage Assembly

Chapter 13: Drive Plate Assembly

Chapter 14: Replacing the Print Mechanism

Chapter 15: Removing the Base/Feed Mechanism

Chapter 16: Forms Compensation Arm Assembly

Chapter 17: Forms Guide Assembly

Chapter 18: Solenoid and Pivot Arm Assemblies

Chapter 19: Paper Feed Motor Assembly

Chapter 20: Replacing Mechanisms in the Base/Feed Mechanism

Appendix A: Printer Specifications

Appendix B: Communication Information

Appendix C: Common PC Board and Extender Cables

Appendix D: Ordering Paper and Supplies

Quick Links

Impact Slip Printer:

Service Guide

Related Manuals for NCR 7156

Summary of Contents for NCR 7156