Epson TM-U375 Technical Manual
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Epson TM-U375 Technical Manual

Impact dot matrix printer
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TM-U375/U375P

Technical Manual

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Summary of Contents for Epson TM-U375

  • Page 1: Technical Manual

    CONFIDENTIAL TM-U375/U375P Technical Manual Using this online technical guide The words on the left side of this screen are bookmarks for all the topics in this guide. Use the scroll bar next to the bookmarks to find any topic you want.
  • Page 2 Technical manual TM-U375/U375P Copied Date Copied by English 4005791...
  • Page 3 INFORMATION OR ANY OTHER INFORMATION IN THE DOCUMENT, INCLUDING (WITHOUT LIMITATION) ANY WARRANTY OF TITLE OR NON-INFRINGEMENT. Seiko Epson has no liability for loss or damage arising from or relating to your use of or reliance on the information on the document.
  • Page 4 CONFIDENTIAL TABLE OF CONTENTS CHAPTER 1 FEATURES AND GENERAL SPECIFICATIONS CHAPTER 2 MECHANISM CONFIGURATION AND OPERATING PRINCIPLES CHAPTER 3 HANDLING AND MAINTENANCE CHAPTER 4 TROUBLESHOOTING CHAPTER 5 DISASSEMBLY CHAPTER 6 APPENDIX CHAPTER 7 TM-U375P INFORMATION...

  • Page 5: Table Of Contents

    CONFIDENTIAL CHAPTER 1 FEATURES AND GENERAL SPECIFICATIONS CONTENTS 1.1 FEATURES ................1.2 GENERAL SPECIFICATIONS ........... 1-2 1.2.1 Printing Specifications ..........1-2 1.2.2 Character Specifications ..........1-2 1.2.3 Paper Specifications ............. 1.2.4 Paper Roll Supply Device ..........1-6 1.2.5 Journal Paper Take-up Mechanism ......1-6 1.2.6 Electrical Specifications ..........
  • Page 6 CONFIDENTIAL DIP switches ..............1-13 1.3.6 Indicators................ 1-14 1.4 FUNCTIONS ................1-14 1.4.1 Error Processing ............1-14 Error detection ............... 1-14 Error recovery ..............1-14 Data receive error ............1-14 1.4.2 Self-test................1-14 1.4.3 Hexadecimal Dumping ..........1-15 Hexadecimal dumping function........1-15 Starting hexadecimal dumping ........
  • Page 7 CONFIDENTIAL CHAPTER 2 MECHANISM CONFIGURATION AND OPERATING PRINCIPLES CONTENTS 2.1 PRINTER MECHANISM COMPONENTS ........2-1 2.2 PRINTER MECHANISM OPERATING PRINCIPLES ....2-1 2.2.1 Transport Mechanism ........... 2-1 Carriage feed gear train ..........2-1 Paper feed gear train ............. 2.2.2 Printing Mechanism ............2-2 Print head unit movement ..........
  • Page 8 CONFIDENTIAL CHAPTER 3 HANDLING AND MAINTENANCE CONTENTS 3.1 HANDLING ................. 3.1.1 Handling Precautions ............ 3-1 Storage precautions ............3-1 Use precautions ............. 3-1 Paper handling precautions.......... 3-1 Ribbon cassette handling precautions ......3-1 3.1.2 Transporting the Printer ..........3-2 Attaching the transport protective materials ....3-2 3.1.3 Loading the Paper Roll ..........
  • Page 9 CONFIDENTIAL CHAPTER 4 TROUBLESHOOTING CONTENTS 4.1 TROUBLESHOOTING ............... 4.1.1 Self-test................Initiating the self-test ............. Self-test standby ............4-1 Ending the self-test ............4-1 4.1.2 Troubleshooting Flowchart ........... 4-2 1 POWER LED does not light ........4-3 2 JOURNAL OUT LED is lit ......... 4-4 3 ERROR LED is lit ............
  • Page 10 CONFIDENTIAL CHAPTER 5 DISASSEMBLY CONTENTS 5.1 SMALL PART SPECIFICATIONS..........5-1 5.2 DISASSEMBLY ................5.2.1 Removing the Fuse ............5.2.2 Removing the Print Head Unit ........5-3 5.2.3 Removing the J Guide Assembly B (Cutter Blade) ..5.3 PRINTER MECHANISM UNIT ASSEMBLY ....... 5-5 5.3.1 Component Parts ............
  • Page 11 CONFIDENTIAL 10 Intermediate Gear B, Gear-Intermediate, Paper Holding Lever Assembly, and Paper Holding Lever Shaft Attachment ............5-33 11 Paper Feed Motor and Form Stopper Assembly Attachment ..............5-34 12 V Sensor Assembly Attachment ......5-35 13 Lead Wire Connection and Handling ...... 5-36 14 Bottom Frame and Form Stopper Spring Attachment ..............
  • Page 12 CONFIDENTIAL 7 Attaching the Paper Take-up Belt and Connecting the Cables ..........5-55 8 GND Plate Attachment ..........5-56 9 Switch Panel and Cover-Face Attachment ..... 5-57 10 Document Table, Cover, and Paper Take-up Shaft Assembly Attachment ........5-58 11 Cover-ROM Attachment ........... 5-59 5.4.4 Adjustments ..............
  • Page 13 CONFIDENTIAL CHAPTER 6 APPENDIX CONTENTS 6.1 MAIN CIRCUIT BOARD DIAGRAMS ........6-1 6.1.1 Main Circuit Block Diagram .......... 6-1 6.2 MAIN CIRCUIT BOARD PARTS LAYOUT ........ 6-10 6.3 OVERALL EXPLODED DIAGRAMS ......... 6-11 6.3.1 Printer Mechanism Unit ..........6-11 6.3.2 Whole Unit ..............6-12 6.4 GENERAL LUBRICATION POINTS DIAGRAMS ......
  • Page 14 CONFIDENTIAL CHAPTER 7 TM-U375P INFORMATION CONTENTS FEATURES AND GENERAL SPECIFICATIONS....... 7-1 Connectors ................Interface ..................DIP Switches ................ELECTRICAL CIRCUITRY OPERATING PRINCIPLES ....7-5 Component Connection Diagram ..........7-5 Circuit Block Diagram .............. Power Supply Circuitry ............7-6 Reset Circuit ..................................
  • Page 15 CONFIDENTIAL TM-U375/TM-U375P Technical Manual Revision Sheet Revision Page Altered Item and Contents Rev. A Rev. B Reliability Information Rev. B...

  • Page 16: Features

    CONFIDENTIAL 1.1 FEATURES The TM-U375 is a high-performance POS printer which handles journal, validation, and slip paper printing in a single unit. The printer has the following features: • Small multi-function 1.5 station printer. • High-speed printing using logic seeking.

  • Page 17: General Specifications

    CONFIDENTIAL 1.2 GENERAL Paper feed pitch 4.233 mm (1/6") (default setting) SPECIFICATIONS Programmable in units of 1/144 inch by using com- mands. 1.2.1 Printing Specifications Printing method Paper feed method Serial impact dot-matrix Friction feed Print head wire layout Paper feed speed Serial type 9-pin Approx.

  • Page 18: Paper Specifications

    CONFIDENTIAL Cut sheet 1.24 (.049") • Slip paper: 1.59 (.063) 70 to 182 ( )(W) x 160 to 257(L) mm (2.76 to 7.17(W) x 6.3 to 10.1(L)") (Maximum line 58 with 4.23 mm paper feed pitch) See Figure 1-10 for the slip paper of paper width 70 to 85 mm (2.76"...
  • Page 19 CONFIDENTIAL Notes on using cut sheets • Use cut sheets with a paper roll loaded. • Use of multi-ply copy paper with a thick middle sheet may decrease copying capability. • Printing noise may change depending on paper thick- ness. Noise may increase when thick single-ply paper is used.
  • Page 20 CONFIDENTIAL Validation paper [Units: mm] Figure 1-8. Validation Paper Print Area Slip paper (Paper width: 85 to 182 mm (3.35" to 7.2")) [Units: mm] Figure 1-9. Slip Paper Print Area (Paper width: 85 to 182 mm (3.35" to 7.2")) Note All the numeric values are typical.

  • Page 21: Paper Roll Supply Device

    Automatic take-up by paper feed motor. 1.2.9 Environmental Specifications 1.2.6 Electrical Specifications Temperature Operation: 5° to 40°C (41° to 104°F) Printer operation voltage (optional power supply: Epson Storage: -10° to 50°C (14° to 122°F) (excluding paper PS-150) and ribbon) +24 V DC ± 10%...

  • Page 22: Reliability

    CONFIDENTIAL 1.2.11 Certifications Impact resistance (in Epson standard package) When packed: EMI standards Height: 60 cm (23.62") FCC Class A Directions: 1 corner, 3 edges, and VDE Class B (F mark) 6 surfaces No external or internal damage should be found after the Safety standards drop test, and the printer should operate normally.

  • Page 23: Hardware Configuration

    CONFIDENTIAL 1.3 HARDWARE CONFIGURATION 1.3.1 Main Unit Configuration Printer mechanism Electrical circuits and components attached to the case Figure 1-14. TM-U375 Main Unit Configuration...

  • Page 24: Main Unit Specifications

    CONFIDENTIAL 1.3.2 Main Unit Specifications Cut sheet sensor (TOF/BOF sensor) This sensor is installed in the cut sheet path. It detects Paper feed motor insertion and ejection for slip paper and insertion for valida- Paper roll and cut sheet are fed by using the common paper tion paper.

  • Page 25: Interface Connector

    Frame ground — connector) [Not available for the TM-U375P] Drawer kick-out drive signal 1 ( 1) This connector is used for the Epson customer display Drawer open/close signal ( 2) (DM-D series). Never connect any other customer + 24 V DC —...

  • Page 26: Interface

    CONFIDENTIAL 1.3.4 Interface Table 1-7. Interface Connector Specifications and Functions (continued) See Chapter 7 for the TM-U375P interface. Signal Function Number Name Data transfer principle: Serial (RS-232C interface) Synchronization: Asynchronous Handshake ( ): DTR/DSR or XON/XOFF DIP SW 2-3 Status Signal level: Printer Status MARK:...
  • Page 27 CONFIDENTIAL XON/XOFF control Example of use: When XON/XOFF control is selected, the XON and XOFF Set the receive buffer to 4K bytes, and check the status output timing is as described below. (XON code: 11H; with ESC v or ESC u for each line of printing transmit- XOFF code: 13H) Transmit timing differs depending on the ted.

  • Page 28: Switches And Buttons

    CONFIDENTIAL Notes 1.3.5 Switches and Buttons • This switch performs fast paper feeding regardless of the paper feed amount set by the ESC 2 and ESC 3 The power switch is located on the front of the printer, at the commands.

  • Page 29: Indicators

    CONFIDENTIAL 1.3.6 Indicators Error recovery Recoverable errors are recovered using DLE ENQ 1 and The indicators are located on the operation panel (see DLE ENQ 2 commands. They are also recovered when the Figure 1-1.) printer power is turned off and on again after the cause is removed.

  • Page 30: Hexadecimal Dumping

    CONFIDENTIAL 1.4.3 Hexadecimal Dumping Cut sheet mode When printing stop is selected and a paper end is detected, Hexadecimal dumping function the printer prints data to the end of the printable area. Then This function prints the data transmitted from the host the printer ejects the paper and enters the paper waiting computer in hexadecimal numbers and their corresponding state after receiving further print data.

  • Page 31: Options

    1.5.2 Display Device DM-D101II, DM-D202II The DM-D101II and D202II displays are able to connect to the TM-U375 printer using the display's pass through func- tion (RS-232C interface). For the DM-D101II and D202II, refer to the specifications or technical manuals published by Epson.

  • Page 32: Printer Mechanism Components

    CONFIDENTIAL 2 . 1 PRINTER MECHANISM COMPONENTS The printer mechanism of the TM-U375 consists of the following component mechanisms: • Transport • Printing • Detection • Paper feed • Ribbon feed • Paper roll take-up These components are described in detail in the following sections.

  • Page 33: Printing Mechanism

    CONFIDENTIAL Gear train for feeding slip paper When the paper feed motor set drives the motor gear so that it rotates in the direction of A, the intermediate gear rotates in the direction of the , and the intermediate drive gear and intermediate holder gear rotate in sequence in the direction of the Note that because the C feed belt is connected to the...

  • Page 34: Print Head Unit Movement

    CONFIDENTIAL Print head unit movement Printing operations involved in forming When the carriage motor set drives the carriage motor gear one character so that it rotates in the direction of the , the rotational force Forming a character (5 x 9 dot matrix) is transferred first to the belt drive pulley and then to the The carriage motor phase switching signal serves as a belt, and the carriage subset (which holds the print head...

  • Page 35: Platen Movement

    Detailed explanations of each of the detection mechanisms are provided in this section. Table 2-1. Detection Mechanism and its Function Detection Mechanism Function • Home position Initial setting of TM-U375 • Carriage motor out-of- Detection of head carriage phase state operation abnormality • Cut sheet (TOF/BOF) Detection of presence/absence Figure 2-12.

  • Page 36: Carriage Motor Out-Of-Phase State Detection Mechanism

    CONFIDENTIAL Carriage motor out-of-phase state detec- Cut sheet detection mechanism The cut sheet detection mechanism functions as a TOF tion mechanism sensor that detects the top of the slip paper loaded from the This mechanism, which detects abnormalities in the rota- front of the printer, and as a BOF sensor that detects both tion of the carriage motor, consists of the shutter plates the presence of validation paper loaded from the top of the...

  • Page 37: Paper Roll Near-End Detection Mechanism

    CONFIDENTIAL 2.2.4 Paper Feed Mechanism Paper roll near-end detection mechanism The near-end sensor consists of the near-end detection There are three types of paper feed operations, as listed lever and a microswitch, and is located on the right side of below.
  • Page 38 CONFIDENTIAL Feeding during and after slip paper printing As soon as the paper is detected, the count for the ON timing starts in the electronic circuit. After the prescribed count is reached, the platen switching solenoid is automati- cally turned on. When current is supplied to the platen switching solenoid, the platen holder unit moves in the direction of A and the intermediate drive roller set built...

  • Page 39: Paper Feed Component Mechanisms

    CONFIDENTIAL Feeding Validation Paper ( )Because the bottom edge of the V movable lever is 1. The current supply for the paper holder switching sole- linked to the paper holder lever set, the range of move- noid is held in the ON state by an external signal. When ment of the V movable lever is restricted by the move- the paper holder lever set is moved in the direction of the ment of the paper holder lever set.
  • Page 40 CONFIDENTIAL V holder lever switching mechanism The V holder lever switching mechanism consists of the platen switching mechanism and the paper holder switch- ing mechanism in combination. When the end of the slip or validation paper is detected by the cut sheet sensor, this mechanism accurately feeds the last part of the paper.

  • Page 41: Other Mechanisms

    CONFIDENTIAL Operation of the clutch mechanism when stopping pa- Other mechanisms per feeding When stopping paper roll feeding, current is supplied to the Manual release mechanism paper feed clutch solenoid on the J paper feed roller shaft. The J release lever of this mechanism is mounted on the This magnetizes the clutch solenoid, causing the paper rear portion of left side of the guide frame (at the paper roll feed clutch plate on the J paper feed roller shaft to retract.
  • Page 42 CONFIDENTIAL When the J insertion lever is rotated by hand in the direction A, the lever closes the cut sheet path C (the state indicated by dotted lines in Figure 2-30) and opens a paper path under the J guide for the paper roll. At the same time, the microswitch turns on.

  • Page 43: Ribbon Feed Mechanism

    CONFIDENTIAL Closing the clamshell mechanism When the carriage motor rotates in the forward direction, the carriage motor gear rotates in the direction of 1. After clearing a paper jam, replacing the print head, or causing the ribbon intermediate gear and planet gears 1 the like, position the carriage in the area of the and 2 to rotate in the direction of mark on the ribbon frame.

  • Page 44: Paper Roll Take-Up Mechanism

    CONFIDENTIAL Figure 2-35. Paper Roll Supply Mechanism Figure 2-36. Paper Roll Take-Up Mechanism Paper roll take-up mechanism The take-up mechanism consists of the parts shown in Figure 2-36. The driving power for taking up the printed paper is trans- ferred in sequence via the paper feed motor set, J paper feed roller shaft set, take-up drive gear pulley mounted on the J paper feed roller shaft, and take-up drive pulley A, which is engaged with the take-up drive gear.

  • Page 45: Electrical Circuitry Operating Principles

    ELECTRICAL CIRCUITRY OPERATING PRINCIPLES 2.3.1 Hardware Configuration Component connection diagram The electrical circuitry of the TM-U375 consists of the following major components. • Main circuit board unit • Switch circuit board unit • Sensor circuit board set • External AC adapter (optional) Figure 2-37 is a component connection diagram for the electrical circuitry.

  • Page 46: Circuit Block Diagram

    CONFIDENTIAL Circuit block diagram Figure 2-38 shows the circuit block diagram for the TM-U375. See Chapter 7 for the TM-U375P circuit block diagram. Figure 2-38. Circuit Block Diagram The main circuit board unit and the switch circuit board unit Main circuit board unit contain the following electrical circuits: •...

  • Page 47: Memory Map

    Table 2-3. The description of the power supply circuit is the same for the TM-U375 and TM-U375P, but the diagram for the TM- U375P is different from Figure 2-40. Refer to Chapter 7 for the TM-U375P power supply circuit diagram.
  • Page 48 CONFIDENTIAL Filter circuit +24V DC control circuit The DC input (+24V) from CN6 (when IM-403 is not con- The +24V DC voltage that drives the printer mechanism is nected) or CN9 (when IM-403 is connected) is supplied to supplied via a FET (Q33) (circuit signal: I24PSW). The the +24V DC control circuit and the +5V control circuit the output state (+24V output on/off) of the FET (Q33) is filter circuit.

  • Page 49: Control Circuitry

    CONFIDENTIAL Control circuitry Reset circuit The reset circuit is used to prevent the CPU from operating erratically and the print head from printing unexpectedly during the period of unstable voltage immediately after the power is turned on. To accomplish this, the OUT terminal output (pin 6) of the reset IC (U4) is supplied to the CPU (U12) as the RESET input signal (pin 28), and is supplied to the gate array (U19) as the RESET input signal (pin 1).
  • Page 50 CONFIDENTIAL Table 2-4. CPU Pin Functions ( continued ) The printer uses an external 8-bit and internal 16-bit CPU (with an external clock of 12 MHz). The CPU (U12) controls No. Pin Signal I/O Level Function the internal processing of the printer according to the Name Name printer control program written in ROM (U15).
  • Page 51 CONFIDENTIAL ROM (64KB) Table 2-5. Gate Array Pin Assignments The printer control program and the character generator No. Pin Signal Function data are written in ROM (U15). The control program Name Name controls the basic operations of the printer; all CPU (U12) Print solenoid #8 drive signal Low: on HEAD8 operations follow this program.
  • Page 52 CONFIDENTIAL Operation panel section and cover open detection circuit The operation panel section includes four LEDs (POWER, ERROR, JOURNAL OUT, and VALIDATION/SLIP), two switches (PAPER FEED and RELEASE) and a photosensor (for detecting whether the printer cover is open or closed). These are mounted on the switch circuit board unit and sensor circuit board set, which is connected to the main circuit board unit via a connector (CN8).
  • Page 53 (DM-D). Then select the Seiko Epson customer display by setting The driver/receiver ICs (U2 and U3) handle level conver- DIP switch 1 on the bank 2 to ON. When this setting is in ÷...
  • Page 54 CONFIDENTIAL Figure 2-44. Host Interface Circuit and Custor Display Interface Circuit 2-23...
  • Page 55 CONFIDENTIAL Drawer kick-out drive circuit The DKD_1 and DKD_2 signals from the CPU set the drawer kick-out driver transistors Q7 and Q8 to on; they in turn output the drawer open signal. The drawer status signal DK_S is input to the gate array, allowing the host to check the status via the interface.

  • Page 56: Printer Mechanism Drive Control Circuit

    CONFIDENTIAL Printer mechanism drive control circuit The CROUT signal (pin 52) is the head conductance limiter signal, and turns the head off if (due to misoperation) power is supplied to the head for more than approximately 1ms. Print head solenoid drive circuit The limiter time is determined according to the CR time The print head, a part of the printer mechanism, consists of constant (C118, R157) of the signal input to the CRIN...
  • Page 57 CONFIDENTIAL Carriage motor drive circuit The carriage motor phase signals CR_1 (pin 22) and CR_2 (pin 21) output from the CPU (U12) are output by the circuit shown in Figure 2-48 to the printer mechanism carriage motor as four phase drive signals (CR_A, CR_B, CR_C, and CR_D).
  • Page 58 CONFIDENTIAL Figure 2-49. Carriage Motor Drive Signal Timing Chart 2-27...
  • Page 59 CONFIDENTIAL Paper feed motor drive circuit As with the carriage motor drive circuit, the paper feed When printing journal (receipt), slip, and validation paper, motor phase signals PFR1 (pin 3) and PFR2 (pin 2) output paper feeding is performed by driving the paper feed motor by the CPU (U12) are supplied to the paper feed motor by in the printer mechanism via the paper feed motor drive this circuit as four phase drive signals (PF_A, PF_B, PF_C,...
  • Page 60 CONFIDENTIAL Platen switching solenoid drive circuit Clutch solenoid drive circuit The printer’s platen is movable, so that it can produce the Supplying current to the clutch solenoid in the printer appropriate platen gap during printing when electricity is mechanism cuts off the driving power of the paper feed supplied to the platen switching solenoid.
  • Page 61 CONFIDENTIAL Printer mechanism overcurrent detection circuit The circuit shown in Figure 2-53 monitors the status of the current flowing to each of the solenoids in the printer mechanism (the clutch, platen switching, and slip switching solenoids). When an overcurrent is detected, the CD_OFF signal is turned on and is supplied to the P51 terminal (pin 16) of the CPU (U12).
  • Page 62 CONFIDENTIAL Sensor control circuits The statuses of the sensors shown in Table 2-8 are monitored by the CPU (U12) and the gate array (U19). Table 2-8. Sensor Monitoring Signals Connector Input Signals Control Circuit Signals Function (supplied by the printer mechanism) Signal Name Connector No./...

  • Page 63: Handling

    CONFIDENTIAL 3.1 HANDLING 3.1.1 Handling Precautions Storage precautions • Avoid storing the printer in a dusty, humid, or excessive low temperature area. Also avoid areas which are exposed to direct sunlight for long periods of time. • For long-term storage, put the printer in a polyethylene bag with anti-rust paper (VCI paper), and keep it in a dry place.

  • Page 64: Transporting The Printer

    CONFIDENTIAL 3.1.2 Transporting the Printer When transporting the printer, attach the transport fixing plate, transporting damper, and upper case damper. Then pack the printer in a specially provided package so that the printer does not come into contact with other products. Also, be careful not to drop it or apply any kind of external stress.
  • Page 65 CONFIDENTIAL (5) When using the take-up spool, follow steps 1), 2) and 3) below. 1) Pull out the side of the take-up spool and insert the tip of the paper roll into the groove on the spool as shown in Figure 3-6. 2) Rotate the spool two or three times to secure the paper and reinsert the side of the take-up spool.

  • Page 66: Removing The Paper Roll

    CONFIDENTIAL 3.1.4 Removing the Paper Roll 3.1.5 Inserting Cut Sheet and Printing on Cut Sheet (1) Cut the journal paper on the cutter (dotted line in Figure 3-7); then remove the take-up spool Inserting cut sheet Note: Be sure to install the paper roll in the printer, even if you plan to print only on slip paper or on validation paper.

  • Page 67: Printing On Cut Sheet

    CONFIDENTIAL 3.1.6 Installing and Removing the Ribbon Cassette Installing the ribbon cassette (1) Turn on the printer and open the printer cover. (2) Turn the ribbon cassette's feed knob two or three times in the direction, to take up any slack in the ribbon. Figure 3-10.

  • Page 68: Removing The Ribbon Cassette

    CONFIDENTIAL Figure 3-13. Installing the Ribbon Cassette (3) Removing the ribbon cassette (1) Turn the printer power off and on again; then open the printer cover. Figure 3-15. Mounting the Power Switch Cover (2) Grasp the ribbon cassette's tab on the left side, lift the 3.1.8 Removing the Jammed Paper left side out first, and then pull the cassette out of the printer by grasping the tab on the right side.

  • Page 69: Maintenance

    CONFIDENTIAL (4) Cut the paper roll. (6) Press down the print head cover after confirming that (5) Remove the paper jam while pulling the release lever the print head is at the center of the printer. If the print toward you, and pull the paper out in the direction as head is not at the center of the printer, bring it to the shown in Figure 3-17.

  • Page 70: Cleaning

    The lubricants for the printer are chosen based on technical information analysis and tests on various lubricants by G-31 Gear-Ribbon transmission mounting shaft Epson. Epson supplies Epson specified lubricants in 40 cc G-31 Ribbon take-up shaft ass'y mounting shaft (gr) plastic containers (the minimum supply unit).

  • Page 71: Tool List

    Table 3-5. Lubricants for the Printer Contact portion of V movable lever and G-36 Paper holding lever Type Name Quantity Commercial Availability Grease 40 gr G-31 Grease 40 gr G-36 40gr 40gr S : EPSON-exclusive product...

  • Page 72: Troubleshooting

    CONFIDENTIAL 4.1 TROUBLESHOOTING Slip paper self-test When status information printing is complete, the slip paper is ejected, and the printer waits for insertion of the next Use the following to troubleshoot and repair the printer: sheet (the VALIDATION/SLIP LED flashes). To continue the self-test, continue to feed slip paper into the printer.

  • Page 73: Troubleshooting Flowchart

    CONFIDENTIAL 4.1.2 Troubleshooting Flowchart Normally, servicing should be performed by component replacement. Repairs of the PCBs and other components If the source of a problem is not clear, use the flowchart should be performed only by technicians. below to find and replace a defective component. Start Power on Is POWER...

  • Page 74: Power Led Does Not Light

    CONFIDENTIAL POWER LED does not light Is power supply cable connected properly? Connect power supply cable properly. OK ? Does external power supply have proper output voltage rating? (approx. +24 Replace external power supply. in no-load condition) OK ? Has fuse F1 on main PCB blown? Replace fuse F1 (refer to Section 4.2.1, Fuse replacement ).

  • Page 75: Journal Out Led Is Lit

    CONFIDENTIAL JOURNAL OUT LED is lit ERROR LED is lit Turn power off, then on again. Turn power off, then on again. OK ? OK ? Is printer cover closed correctly? Is cover open sensor continuity on switch PCB unit Close the cover correctly.

  • Page 76: Error Led Is Flashing

    CONFIDENTIAL ERROR LED is flashing. Paper is not loaded by pressing down paper load switch. Is paper jammed in the paper inlet path? Are connectors Remove the paper. inside the printer hooked up correctly? OK ? Hook up connectors correctly. Is paper load switch OK ? continuity normal?

  • Page 77: Self-Test Is Not Normal

    CONFIDENTIAL Self-test is not normal. Does printer operate at all? Is cover closed properly? Close cover properly. Is data printed on slip paper or paper roll when OK ? performing validation paper printing? Is cover open sensor assembly continuity Printing is carried out, but normal ? ( 1) print quality is deficient or Replace switch PCB unit.

  • Page 78: Data From Host Is Not Printed Normally

    CONFIDENTIAL Data from host is not printed normally (for the serial model) (*) (*) See Chapter 7 for the parallel interface model. Set SW1 of DIP switch bank 1 to OFF. Send data from host to printer. Is “?” printed? Are RS-232C interface parameters set to identical values at...

  • Page 79: Troubleshooting Tables

    CONFIDENTIAL 4.1.3 Troubleshooting Tables Level Level A If a problem that can be verified by visual examination has The problem can be corrected by persons who are occurred, use the tables below to determine the cause and familiar with the printer and have general knowledge, but perform repairs.
  • Page 80 CONFIDENTIAL Table 4-1. Initialization Problems (continued) Checkpoint Level Action Problem Probable Cause Check gears for wear and dam- Wear, damage, or con- Replace any damaged Carriage first moves tamination of carriage age. gears. normally, but then hits drive gears the left side of the print Check for dirt deposits or other Remove any dirt deposits frame, making an un-...
  • Page 81 CONFIDENTIAL Table 4-2. Printing Quality Problems (continued) Problem Checkpoint Action Probable Cause Level Dots are dropped ir- Check the FFC for continuity. Replace FFC-Print head. FFC-Print head wire regularly. break Check dot wire tip for paper or Clean wire tip. Print head operation fail- ink deposits.
  • Page 82 CONFIDENTIAL Table 4-3. Printer Mechanism Problems (continued) Problem Level Probable Cause Checkpoint Action Paper roll is not fed or Check whether paper roll cor- Use paper roll that corre- Paper roll supply problem paper roll feed pitch is responds to specifications. sponds to specifications.
  • Page 83 CONFIDENTIAL Table 4-3. Printer Mechanism Problems (continued) Problem Probable Cause Level Checkpoint Action Slip or validation paper Poor adjustment of Check attaching position of the Adjust the solenoid attach- is not fed. (continued) Solenoid-Paper solenoid. ing position as described holding switching in Main Assembly 7 in Sec- position tion 5.3.3.

  • Page 84: Major Part Replacement

    CONFIDENTIAL Table 4-3. Printer Mechanism Problems (continued) Checkpoint Action Problem Probable Cause Level Different character than Command problem Check data sent from host with Correct the application input code is printed. hexadecimal dumping func- program. (continued) tion. Ribbon feed mecha- Ribbon drive plate as- Check to see if Ribbon drive Replace Ribbon drive...

  • Page 85: Error Types And Countermeasures

    CONFIDENTIAL 4.3 ERROR TYPES AND COUNTERMEASURES Follow the flowcharts on the next page based on the ERROR LED blinking patterns in the table below, and repair the printer. The printer does the following when an error occurs: • Stops all operations. •...
  • Page 86 CONFIDENTIAL Action 2 Action 1 Action 1 Action 3 Wait for the print head temperature drop. Is paper jammed in the paper inlet path? Is the printer recovered Remove the paper. from the error? OK ? Replace main PCB. Execute DLE ENQ 1 or DLE ENQ 2 command, or reset the printer ( ).

  • Page 87: Small Part Specifications

    CONFIDENTIAL Small Part Abbreviations 5.1 SMALL PART SPECIFICA- TIONS : Cross-recessed Binding head screw : Cross-recessed Cup head screw : Cross-recessed Pan head screw This section uses abbreviations for small parts such as CP (O) : Cross-recessed Pan head screw with screws and washers.

  • Page 88: Disassembly

    CONFIDENTIAL 5.2 DISASSEMBLY This section describes disassembly procedures for replacing the following three parts: • Fuse • Print head unit • J guide assembly B (cutter blade) For other disassembly procedures, refer to Section 5.3, Printer Mechanism Assembly , and to Section 5.4, Whole Unit Assembly .

  • Page 89: Removing The Print Head Unit

    CONFIDENTIAL 5.2.2 Removing the Print Head Unit Disassembly Disassembly Procedure Step • Open the Cover. • Remove the Ribbon cassette. • Push the Lever-Ribbon frame toward you and open the Ribbon frame assembly by turning it in the direction. • Remove the Print head unit from the printer and disconnect the FFC-Print head from the print head unit connector.

  • Page 90: Removing The J Guide Assembly B (Cutter Blade)

    CONFIDENTIAL 5.2.3 Removing the J Guide Assembly B (Cutter Blade) Disassembly Disassembly Procedure Step • Remove the Printer mechanism assembly from the Case-Main by performing Main Assembly 5 to 10 in Section 5.4.3 in reverse. • Push the Lever-Ribbon frame in the 1 direction, and open the Ribbon frame assembly ( direction).

  • Page 91: Printer Mechanism Unit Assembly

    CONFIDENTIAL 5.3 PRINTER MECHANISM Guide frame assembly B Sub-assembly E J holding roller shaft UNIT ASSEMBLY J holding roller Guide frame sub-assembly The assembly process is divided into sub-assembly and Spring-J holding roller main assembly. V sensor assembly Perform the sub-assembly first to construct each unit from Sub-assembly F V sensor sub-assembly the component parts.
  • Page 92 CONFIDENTIAL Print frame unit B Sub-assembly I Print frame sub-assembly Main Assembly 1 Main frame assembly FFC guide assembly Sub-assembly A Paper take-up drive pulley A Relay circuit board assembly Paper take-up drive gear Sub-assembly B Platen holder unit Sub-assembly G Carriage motor J feed roller shaft holder (left) Plate-Carriage sensor...

  • Page 93: Sub-Assembly

    CONFIDENTIAL 5.3.2 Sub-assembly Sub-assembly A FFC Guide Assembly Assembly Part Name Assembly Procedure Step FFC-Print head • Put a mark on the FFC-Print head at 66.5 mm (2.62") from its bent portion. Guide-FFC • Attach the FFC to the Guide-FFC as shown in the figure. <Checkpoint>...

  • Page 94: B Relay Circuit Board Assembly

    CONFIDENTIAL Sub-assembly B Relay Circuit Board Assembly Assembly Part Name Assembly Procedure Step Relay circuit board sub-ass'y • Solder the lead wires of the Carriage sensor sub-assembly and the Carriage sensor sub-assembly Home position sensor sub-assembly to the Relay circuit board Home position sensor sub-as- sub assembly terminals.

  • Page 95: D Paper Holding Lever Assembly

    CONFIDENTIAL Sub-assembly D Paper Holding Lever Assembly Assembly Part Name Assembly Procedure Step Paper holding lever • Attach the Magnetic field block plate and paper holding solenoid Magnetic field block plate shaft to the Paper holding lever; then insert the Spring pin. Spring pin Paper holding solenoid shaft S holding roller shaft sub as-...

  • Page 96: E Guide Frame Assembly B

    CONFIDENTIAL Sub-assembly E Guide Frame Assembly B Assembly Part Name Assembly Procedure Step J holding roller shaft • Insert the J holding roller shaft into the J holding roller. J holding roller Guide frame sub-assembly B • Insert the J holding roller shaft into holes A and B of the Guide frame RE (1.5) sub-assembly B;...

  • Page 97: G Platen Holder Unit Assembly

    CONFIDENTIAL Sub-assembly G Platen Holder Unit Assembly Assembly Part Name Assembly Procedure Step Platen • Attach the V movable lever spring to hook A of the Platen. V movable lever spring Plate-Platen mounting • Align the dowel holes of the Platen with the dowels of the Plate-Platen CBS-tite (M3 x 5) mounting, and fasten the Platen with the screws.
  • Page 98 CONFIDENTIAL Sub-assembly G Assembly Part Name Assembly Procedure Step Platen adjustment roller • Attach the Platen adjustment rollers to the Platen holder so that the Platen adjustment roller holder bottoms of the rollers are inserted in the rectangular holes on the Plate-Platen mounting.
  • Page 99 CONFIDENTIAL Sub-assembly G Assembly Part Name Assembly Procedure Step J feed roller shaft assembly • Attach the J feed roller shaft assembly to the U-grooves of the V movable lever. 5-13...
  • Page 100 CONFIDENTIAL Sub-assembly H Ribbon Frame Assembly B Assembly Part Name Assembly Procedure Step Frame-Ribbon • Align dowel A of the Microswitch sub-assembly with hole B on the Microswitch sub-assembly Frame-Ribbon. • Route the microswitch lead wires as shown in the figure. 5-14...
  • Page 101 CONFIDENTIAL Sub-assembly H Assembly Part Name Assembly Procedure Step V holding roller shaft • Insert the Roller-Holding (large) and Roller-Holding (small) onto Roller-Holding (small) the V holding roller shaft. Make sure that the flat surface of the Roller-Holding (large) rollers faces inward. Guide-Slip paper •...

  • Page 102: H Ribbon Frame Assembly B

    CONFIDENTIAL Sub-assembly H Assembly Part Name Assembly Procedure Step Guide-Slip paper • Insert the feet of the Microswitch into position F of the Guide-Slip CCS-tite (M2.5 x 5) paper. • Attach the Microswitch to the Guide-Slip paper by aligning the dowel and hole with the hole and dowel of the Guide-Slip paper.

  • Page 103: Print Frame Unit Assembly B

    CONFIDENTIAL Sub-assembly I Print Frame Unit Assembly B Assembly Part Name Assembly Procedure Step Print frame sub assembly • Align the FFC guide ass'y pawl with the print frame sub-assembly FFC guide assembly notch, and align the indent with the protrusion. Sub-assembly A Relay circuit board assembly •...
  • Page 104 CONFIDENTIAL Sub-assembly I Assembly Part Name Assembly Procedure Step • Turn over the Print frame sub-assembly and insert the carriage Carriage motor CBS-tite (M3 x 4) motor gear in hole G; then secure the motor with the screw. Plate-Carriage sensor •...
  • Page 105 CONFIDENTIAL Sub-assembly I Assembly Part Name Assembly Procedure Step Tension plate assembly • Insert the protrusion of the Tension plate assembly from the bottom of CC (M3 x 5) the Print frame sub-assembly into the rectangular hole; then tighten the screw loosely so that the tension plate moves. Home position sensor sub as- •...
  • Page 106 CONFIDENTIAL Sub-assembly I Assembly Part Name Assembly Procedure Step Pulley-Belt drive • Attach the two Pulley-Belt drive to the Print frame sub-assembly, RE (2.3) and fasten them with the E-rings. Gear-Transmission • Mount the two Gear-Transmission on the Print frame sub-assem- RE (2.3) bly with the protruded holes face down, and attach the E-ring to shaft Gear-Intermediate transmission...
  • Page 107 CONFIDENTIAL Sub-assembly I Assembly Part Name Assembly Procedure Step Carriage assembly • Attach the carriage assembly belt to the belt drive pulleys. Sub-assembly C • Insert Shaft-Carriage guide A in the Carriage assembly through Shaft-Carriage guide-A RE (2.3) hole M of the Print frame sub-assembly, and fasten it with the E-ring. •...
  • Page 108 CONFIDENTIAL Sub-assembly I Assembly Part Name Assembly Procedure Step Insulation sheet • Paste the Insulation sheet to the Earth plate-Print head. Earth plate-Print head • Place the Earth plate-Print head on the Carriage assembly. (The plate is not fastened here. It is fastened in Main Assembly 16 .) (21) (FFC-Print head) •...
  • Page 109 CONFIDENTIAL Sub-assembly I Assembly Part Name Assembly Procedure Step Ribbon frame assembly B • While pushing the Lever-Ribbon fame lightly in the direction, align Sub-assembly H the U-grooves of the Frame-Ribbon with the grooves on the Shaft- Carriage guide A. Shaft-Carriage guide B •...

  • Page 110: Main Assembly

    CONFIDENTIAL 5.3.3 Main Assembly Main Assembly 1 Paper Take-up Drive Pulley A and Platen Holder Unit Attachment Assembly Part Name Assembly Procedure Step Main frame assembly • Attach Paper take up drive pulley A to the Main frame assembly and fasten it with the E-ring.

  • Page 111: Linked Lever, And Fulcrum Shaft A And B Attachment

    CONFIDENTIAL Main Assembly 2 Linked Lever, and Fulcrum Shaft A and B Attachment Assembly Part Name Assembly Procedure Step Fulcrum shaft B • Insert Fulcrum shaft B from inside the Platen holder unit and fasten RE (2.3) the shaft with the E-ring. Linked lever spring •...

  • Page 112: Attachment

    CONFIDENTIAL Main Assembly 3 Intermediate Drive Roller Assembly and Guide Frame Assembly B Attachment Assembly Part Name Assembly Procedure Step Intermediate drive shaft spring • Insert the Intermediate drive shaft spring in portion A of the Platen holder unit. Intermediate drive roller ass'y •...

  • Page 113: Lever-Release J Attachment

    CONFIDENTIAL Main Assembly 4 Lever-Release J Attachment Assembly Part Name Assembly Procedure Step Lever-Release J • Align the U-groove of the Lever-Release J with the shaft inside the CCS-tite (M2.5 x 4) spring, and insert tab A into hole B; then secure the lever with the screw.

  • Page 114: Guide Assembly B, C Feed Belt, And V Feed Roller Assembly Attachment

    CONFIDENTIAL Main Assembly 5 J Guide Assembly B, C Feed Belt, and V Feed Roller Assembly Attachment Assembly Part Name Assembly Procedure Step J guide assembly B • Place protrusions A and C under portions B and D, respectively. (The J guide assembly B is secured later, in Main Assembly 16 .)) C feed belt •...

  • Page 115: Solenoid-Platen Switching And Tension Lever Assembly Attachment

    CONFIDENTIAL Main Assembly 6 Solenoid-Platen Switching and Tension Lever Assembly Attach- ment Assem- Part Name Assembly Procedure bly Step Solenoid-Platen switching • Align the shaft of the Solenoid-Platen switching with the U-shaped CC (M3 x 6) notch of the Linked lever; then provisionally tighten the screw in hole (Final tightening is done in Adjustment C performed in Main Assembly 14 .) •...

  • Page 116: Solenoid-Paper Holding Switching Attachment

    CONFIDENTIAL Main Assembly 7 Solenoid-Paper Holding Switching Attachment Assembly Part Name Assembly Procedure Step Solenoid-Paper holding switch- • Align hole A of the Main frame assembly with hole B of the Solenoid- Paper holding switching; then secure the solenoid with the screw. CC (M3 x 5) When attaching the solenoid, adjust its position so that the space between the lower end of hole C and the lower end of hole D is within...

  • Page 117: Feed Roller Assembly, Intermediate Holding

    CONFIDENTIAL Main Assembly 8 S Feed Roller Assembly, Intermediate Holding Roller Assembly, and S Belt Attachment Assembly Part Name Assembly Procedure Step S feed roller assembly • Insert the S feed roller assembly in holes A and B from the bottom of RE (2.3) the Main frame assembly.

  • Page 118: Paper Guide (Upper) Attachment

    CONFIDENTIAL Main Assembly 9 Paper Guide (Upper) Attachment Assembly Part Name Assembly Procedure Step Paper guide (upper) • Insert the Paper guide (upper) from the front of the Main frame CCS-tite (M2.5 x 4) assembly ( 1 direction). Move the paper guide in 2 direction, and align the U-shaped notch with dowel A, hole B with dowel C, L-shaped portion D with portion E, and protrusions F with holes G;...

  • Page 119: Intermediate Gear B, Gear-Intermediate, Paper

    CONFIDENTIAL Main Assembly 10 Intermediate Gear B, Gear-Intermediate, Paper Holding Lever Assembly, and Paper Holding Lever Shaft Attachment Assembly Part Name Assembly Procedure Step Intermediate gear B • Attach Intermediate gear B to the Main frame assembly with the small gear facing inside. Gear-Intermediate •...

  • Page 120: Paper Feed Motor And Form Stopper Assembly Attachment

    CONFIDENTIAL Main Assembly 11 Paper Feed Motor and Form Stopper Assembly Attachment Assembly Part Name Assembly Procedure Step Paper feed motor • Attach the Paper feed motor to the Main frame assembly so that CCS-tite (M2.5 x 5) portions A and B hold the motor; then tighten the screws. Form stopper assembly •...

  • Page 121: Sensor Assembly Attachment

    CONFIDENTIAL Main Assembly 12 V Sensor Assembly Attachment Assembly Part Name Assembly Procedure Step V sensor assembly • Align surface A of the V sensor assembly with surface B of the Main Sub-assembly F frame assembly; then secure the sensor with the screw. CCS-tite (M2.5 x 5) 5-35...

  • Page 122: Lead Wire Connection And Handling

    CONFIDENTIAL Main Assembly 13 Lead Wire Connection and Handling Assembly Part Name Assembly Procedure Step (Connectors) • Attach the paper holding switching and platen switching solenoids connector, paper feed motor connector, and V sensor assembly connector together as shown in the figure. •...

  • Page 123: Bottom Frame And Form Stopper Spring Attachment

    CONFIDENTIAL Main Assembly 14 Bottom Frame and Form Stopper Spring Attachment Assembly Part Name Assembly Procedure Step Bottom frame • Align the dowels on the Bottom frame with the dowel holes in the Main CCS-tite (M2.5 x 5) frame assembly; then tighten the screws. Form stopper spring •...

  • Page 124: Print Frame Unit B Attachment

    CONFIDENTIAL Main Assembly 15 Print Frame Unit B Attachment Assembly Part Name Assembly Procedure Step Print frame unit B • Align the dowels of the Print frame unit B with the U-shaped Sub-assembly I grooves of the Main frame assembly. CCS-tite (M3 x 8) •...

  • Page 125: Print Head Mask Assembly B Attachment

    CONFIDENTIAL Main Assembly 16 Print Head Mask Assembly B Attachment Assembly Part Name Assembly Procedure Step • Push the Lever-Ribbon frame in 1 direction and open the Ribbon frame assembly B ( 2 direction). • Remove the screws from the Print head unit; then turn the Print head unit in 3 direction.

  • Page 126: Adjustments

    CONFIDENTIAL 5.3.4 Adjustments When servicing or repairing the printer and after replacing any parts, be sure to perform the following adjustments to assure correct operation. Adjustment A Gear-Intermediate and Gear-Paper Feed Motor Backlash Procedure Adjust- Step Adjustment Notes ment Loosen the fastening screws of the Motor- Paper feed.

  • Page 127: B Space Adjustment Between The Linked Lever And Platen Holder

    CONFIDENTIAL Adjustment B Space Adjustment Between the Linked Lever and Platen Holder Procedure Adjust- Step Adjustment Notes ment Loosen the Solenoid-Platen switching securing screw. Move the Solenoid-Platen switching up • Space (A): 9.3 ± 0.2 mm (0.37 ± 0.008") and down to adjust the space between the Linked lever and Platen holder.

  • Page 128: D Platen Gap Adjustment

    CONFIDENTIAL Adjustment D Platen Gap Adjustment Procedure Adjust- Step Assembly Notes ment Verify that the platen surface protrudes • If the platen surface does not protrude, push the Linked from the guide frame surface. lever to extend the Platen. Move the Print head unit to the two adjust- ment points, and perform Step 3 for each point.

  • Page 129: Whole Unit Assembly

    CONFIDENTIAL 5.4 WHOLE UNIT ASSEMBLY Main Assembly 1 Main circuit board unit Sub-assembly C As for the printer mechanism unit, the assembly process for Motor cable assembly the whole unit is divided into sub-assembly and main Head cable assembly assembly. Carriage motor cable assembly Power switch assembly Perform the sub-assembly first to construct each unit from...

  • Page 130: Sub-Assembly

    CONFIDENTIAL 5.4.2 Sub-assembly Sub-assembly A N.E. Detector Unit Assembly Assem- Part Name Assembly Procedure bly Step Holder-N.E. detector • Attach the Nut to the Holder-N.E. detector by inserting its curved face first. Microswitch • Attach the Microswitch to the Holder-N.E. detector and tighten the screw.

  • Page 131: B Pasting Caution Seals

    CONFIDENTIAL Sub-assembly B Pasting Caution Seals Assembly Part Name Assembly Procedure Step Cover • After removing any dust and dirt from the caution seals' mounting Caution seal A surfaces, paste the seals along the lines inside the Cover. Caution seal B <Checkpoints>...

  • Page 132: C Main Circuit Board Unit

    CONFIDENTIAL Sub-assembly C Main Circuit Board Unit Assembly Part Name Assembly Procedure Step Main circuit board assembly • Attach the P-ROM to the socket of the Main circuit board assembly, P-ROM matching the U-shaped grooves of the socket to the P-ROM. <Checkpoint>...

  • Page 133: E Rubber Feet And Frame Ground Screw Attachment

    CONFIDENTIAL Sub-assembly E Rubber Feet and Frame Ground Screw Attachment Assembly Part Name Assembly Procedure Step Plate-Base assembly • After removing any dust or dirt from the rubber feet mounting locations, Rubber foot paste the feet in place. CP (O) (M3 x 5) •...

  • Page 134: F Switch Circuit Board Assembly And Sensor Circuit Board Assembly Attachment

    CONFIDENTIAL Sub-assembly F Switch Circuit Board Assembly and Sensor Circuit Board Assembly Attachment Assembly Part Name Assembly Procedure Step Plate-Front • Align holes A and B in the Switch circuit board assembly with hook Switch circuit board assembly C and dowel D on the Plate-Front, respectively; then fasten the board CC (M3 x 4) assembly with the screws.

  • Page 135: Main Assembly

    CONFIDENTIAL 5.4.3 Main Assembly Main Assembly 1 Main Circuit Board Unit, Cables, and Cover-Circuit Board Attachment Main Assembly 1 for the TM-U375P is different from this description. Refer to Chapter 7 for the TM-U375P. Assembly Part Name Assembly Procedure Step Main circuit board unit •...

  • Page 136: E. Detector Unit Attachment

    CONFIDENTIAL Main Assembly 2 N.E. Detector Unit Attachment Assembly Part Name Assembly Procedure Step (Case-Main) • Align portion A of the N.E. detector unit with portion B of the Case- N.E. detector unit Main, and slide the detector unit in to attach it. Sub-assembly A 5-50...

  • Page 137: Plate-Base Assembly And Plate-Auxiliary Attachment

    CONFIDENTIAL Main Assembly 3 Plate-Base Assembly and Plate-Auxiliary Attachment Assembly Part Name Assembly Procedure Step (N.E. detector unit) • Attach the N.E. detector unit connector to CN5 on the Main circuit board unit. Plate-Base assembly • Insert the cables connected to the Main circuit board unit into hole CPT-B (M3 x 10) A of the Case-Main.

  • Page 138: Paper Roll Receive Roller, J Paper Guide Roller, Power Switch Assembly, Detection Adjustment Screw, And Paper Take-Up Gear Assembly Attachment

    CONFIDENTIAL Main Assembly 4 Paper Roll Receive Roller, J Paper Guide Roller, Power Switch Assembly, Detection Adjustment Screw, and Paper Take-up Gear Assembly Attachment Assembly Part Name Assembly Procedure Step • Attach the Paper roll receive rollers to the Case-Main by pushing the Paper roll receive roller rollers into place.

  • Page 139: Plate-Front Attachment To The Printer Mechanism Assembly

    CONFIDENTIAL Main Assembly 5 Plate-Front Attachment to the Printer Mechanism Assembly Assembly Part Name Assembly Procedure Step Printer mechanism assembly • Attach the Plate-Front to the Printer mechanism assembly. At this Plate-Front time, make sure that dowel A of the Plate-Front is aligned with U Sub-assembly F groove B of the Printer mechanism assembly.

  • Page 140: Printer Mechanism Assembly Attachment To The Case-Main

    CONFIDENTIAL Main Assembly 6 Printer Mechanism Assembly Attachment to the Case-Main Assembly Part Name Assembly Procedure Step • Insert the Sleeves into the Vibration spacers. Sleeve Vibration spacer Printer mechanism assembly • Attach the assembled Vibration spacers to the Printer mechanism CPT-B (P2) (M2.6 x 24) x 4 assembly.

  • Page 141: Attaching The Paper Take-Up Belt And Connecting The Cables

    CONFIDENTIAL Main Assembly 7 Attaching the Paper Take-up Belt and Connecting the Cables Assembly Part Name Assembly Procedure Step (Paper take-up belt) • Hold the middle of the Paper take-up belt with your finger, and attach the belt to the Paper take-up drive pulley. •...

  • Page 142: Gnd Plate Attachment

    CONFIDENTIAL Main Assembly 8 GND Plate Attachment Assembly Part Name Assembly Procedure Step (Cable) • Connect the cable of the Switch circuit board assembly to the connector on the Main circuit board unit. Eye lock • Bundle all the cables in front of the Main circuit board unit with the Eye lock.

  • Page 143: Switch Panel And Cover-Face Attachment

    CONFIDENTIAL Main Assembly 9 Switch Panel and Cover-Face Attachment Assembly Part Name Assembly Procedure Step • Remove any dust or dirt from the Switch panel's mounting surface on Switch panel the Plate-Front; then paste the panel along the edge of the plate. Cover-Face •...

  • Page 144: Document Table, Cover, And Paper Take-Up Shaft Assembly Attachment

    CONFIDENTIAL Main Assembly 10 Document Table, Cover, and Paper Take-up Shaft Assembly Attachment Assembly Part Name Assembly Procedure Step Document table • Insert about the 2/3 (dotted line in the figure) of the Document table CBS-tite (M2.5 x 5) into the Case-Main, as indicated by •...

  • Page 145: Cover-Rom Attachment

    CONFIDENTIAL Main Assembly 11 Cover-ROM Attachment Assembly Part Name Assembly Procedure Step Spacer-ROM • Remove any dust or dirt from the Spacer-ROM mounting location on the Cover-ROM. • Paste the Spacer-ROM in place as shown in the extended illustration. Cover-ROM •...

  • Page 146: Adjustments

    CONFIDENTIAL 5.4.4 Adjustments Adjustment A Adjusting the Paper Roll Near-end Detector Position The minimum detectable amount of paper on the paper roll can be set by following the instructions below. The remaining detectable amount differs depending on the inner and outer diameters of the paper roll core. Procedure Adjust- Step...

  • Page 147: B Head Duty Control Adjustment

    CONFIDENTIAL Adjustment B Head Duty Control Adjustment Perform this adjustment when the print head unit or main circuit board unit is replaced. The following problems may occur if the adjustment is not performed: • The print head may be damaged or the fuse may be blown by heat generation. •...
  • Page 148 CONFIDENTIAL 6.1 MAIN CIRCUIT BOARD DIAGRAMS Main circuit board contains circuit 1 to circuit 6 and main circuit which are shown in the following pages. The circuit 4 and main circuit are different from ones for the TM-U375P. See Chapter 7 for the TM-U375P circuit 4 and main circuit.
  • Page 149 CONFIDENTIAL Circuit 1...
  • Page 150 CONFIDENTIAL Circuit 2...
  • Page 151 CONFIDENTIAL Circuit 3...
  • Page 152 CONFIDENTIAL Circuit 4...
  • Page 153 CONFIDENTIAL Circuit 5...
  • Page 154 CONFIDENTIAL Circuit 6...
  • Page 155 Main Circuit The main circuit for the TM-U375P is different from the below. See Chapter 7 for the TM-U375P main circuit.
  • Page 157 6-10...
  • Page 158 6-11...
  • Page 159 6-12...

  • Page 160: Features And General Specifications

    CONFIDENTIAL The TM-U375P printer is the parallel interface model of the TM-U375 printer. Descriptions other than in this chapter are the same as TM-U375. FEATURES AND GENERAL SPECIFICATIONS Connectors Figure 7-1. TM-U375P Rear Panel Connectors Interface (Bidirectional parallel interface: in accordance with the IEEE 1284 nibble/byte modes) Copyright©...
  • Page 161 CONFIDENTIAL NOTES: • A prefix “n” to signal names refers to low active signals. • If the host does not have any one of the signal lines listed above, two-way communication fails. • For interfacing, signal lines should use twisted pair cables with the return sides connected to the signal ground level. •...
  • Page 162 CONFIDENTIAL Switching between on-line and off-line On-line and off-line switching for the TM-U375P is the same as for the TM-U375. Please see the description in Chapter 1. Precautions on receiving status from the printer The printer status transmission is available by using the both-way communication facility in the Nibble/Byte mode in accordance with the IEEE 1284 mode.

  • Page 163: Dip Switches

    CONFIDENTIAL Notes on setting DIP switch 2-3 to ON • The printer mechanism stops but does not become busy when an error has occured, the cover is open, printing stops due to a paper end, or paper is fed using the PAPER FEED button. •...

  • Page 164: Electrical Circuitry Operating Principles

    CONFIDENTIAL Table 7-3. TM-U375P DIP Switch 2 Function Undefined Print column selection (7x9 / 9x9 font) 42 CPL/35 CPL 40 CPL/33 CPL Busy condition Receive buffer-full Off-line or receive buffer-full Internal use (do not change the setting) Internal use (do not change the setting) Internal use (do not change the setting) Undefined nlnit reset signal...

  • Page 165: Circuit Block Diagram

    CONFIDENTIAL Circuit Block Diagram Figure 7-3. TM-U375P Circuit Block Diagram Power Supply Circuitry Figure 7-4. TM-U375P Power Supply Circuit Diagram...

  • Page 166: Reset Circuit

    CONFIDENTIAL Reset Circuit The reset circuit is used to prevent the CPU from operating erratically and the print head from printing unexpectedly during the period of unstable voltage immediately after the pwer is turned on. To accomplish this, the OUT terminal output (pin 6) of the reset IC (U4) is supplied to the CPU (U12) as the RESET input signal (pin 28), and is supplied to the gate array (U19) as the RESET input signal (pin 1).

  • Page 167: Gate Array

    CONFIDENTIAL Table 7-4. TM-U375P CPU Pin Functions (continued) Gate Array Table 7-5. TM-U375P Gate Array Pin Assignment...
  • Page 168 CONFIDENTIAL Table 7-5. TM-U375P Gate Array Pin Assignment (continued)

  • Page 169: Host Interface Circuit

    CONFIDENTIAL Host Interface Circuit TM-U375P has an IEEE 1284 parallel interface for connection to the host computer. The control CPU (I/F circuit board U2) controls the transmission with the host computer, and the CPU converts the received data to serial data and sends it to the main circuit board CPU.

  • Page 170: Troubleshooting

    CONFIDENTIAL TROUBLESHOOTING Data from host is not printed normally (for the parallel interface model). Does interface cable match specifications? Replace with a proper cable. OK ? Is the interface wire broken? Replace the interface cable. OK ? Is the I/F board connected to the main PCB firmly? Connect the board firmly.

  • Page 171: Assembly

    CONFIDENTIAL ASSEMBLY Whole Unit Sub-assembly C Main Circuit Board Unit Assembly Part Name Assembly Procedure Step Main circuit board assembly • Attach the P-ROM to the socket of the main circuit board assembly, P-ROM matching the U-shaped grooves of the socket to the P-ROM. I/F circuit board •...

  • Page 172: Whole Unit Main Assembly 1

    CONFIDENTIAL Whole Unit Main Assembly 1 Main Circuit Board Unit, Cables, and Cover-Circuit Board Assembly Part Name Assembly Procedure Step Main circuit board unit • Attach the motor cable, head cable, carriage motor cable, and Sub-assembly C power switch assemblies to the corresponding connectors on the Motor cable assembly main circuit board unit.

  • Page 173: Appendix

    CONFIDENTIAL APPENDIX Main Circuit Board Diagrams All the main circuit board diagrams except the circuit 4 and main circuit are the same as the TM-U375. See Chapter 6 for the diagrams that are the same as the TM-U375. 7-14...
  • Page 176 CONFIDENTIAL 7-17...
  • Page 177 CONFIDENTIAL 7-18...
  • Page 178 CONFIDENTIAL 7-19...
  • Page 179 CONFIDENTIAL 7-20...

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