Epson LQ-510 Technical Manual
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Epson LQ-510 Technical Manual

Epson LQ-510 Technical Manual

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LQ-510/AP-4000
T E C H N I C A L
M A N U A L
EPSON

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Summary of Contents for Epson LQ-510

  • Page 1 LQ-510/AP-4000 T E C H N I C A L M A N U A L EPSON...
  • Page 2 Epson America, Inc. No patent liability is assumed with respect to use of the informa- tion contained herein. While every precaution has been taken in the preparation of this book, Epson America, Inc., assumes no responsibility for errors or omissions.
  • Page 3 If the Epson product has a primary AC rating different from the available power source, do not connect it to the power source. 3. Always verify that the Epson product has been disconnected from the power source before removing or replacing printed circuit boards and/or individual chips.
  • Page 4 REV-A REVISION SHEET LQ-510 -iv-...

  • Page 5: Fcc Compliance Statement For American Users

    Epson America, Inc. No patent liability is assumed with respect to use of the information contained herein. While every precaution has been taken in the preparation of this book, Epson America, Inc., assumes no responsibility for errors or omissions.
  • Page 6 The AP4000 is mechanically and electronically the same as the LQ-510. All the information contained herein is equally applicable to both printers. Below is a list of unique parts for the Epson ActionPrinter 4000: Description Part Number Logo plate Individual carton box Pad sleeve ActionPrinter 4000 parts not listed above are identical to those for the LQ-510.
  • Page 7 REV.-A TABLE OF CONTENTS GENERAL DESCRIPTION CHAPTER 1. CHAPTER 2. PRINCIPLES OF OPERATION CHAPTER 3. OPTIONAL EQUIPMENT DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT CHAPTER 4. CHAPTER 5. TROUBLESHOOTING MAINTENANCE CHAPTER 6. APPENDIX LQ-510...

  • Page 8: Table Of Contents

    GENERAL DESCRIPTION REV.-A CHAPTER 1 GENERAL DESCRIPTION FEATURES ..................SPECIFICATIONS ................1.2.1 Hardware Specifications ............1.2.2 Firmware Specifications (ESC/P) .......... 1-13 INTERFACE OVERVIEW ..............DIP SWITCHES AND JUMPER SETTING ........... 1-16 1-16 1.4.1 DIP Switch Settings ............. 1-17 1.4.2 Jumper Setting ..............1-17 SELECTYPE FUNCTION ..............
  • Page 9 REV.-A GENERAL DESCRIPTION LIST OF FIGURES Exterior Views of the LQ-510 ..........Figure 1-1. Figure 1-2. Pin Configuration ............Label Dimensions ............Figure 1-3. Printable Area for Cut Sheets ........... Figure 1-4. Printable Area for Continuous Paper ......... 1-7 Figure 1-5. 1-12 Figure 1-6.

  • Page 10: Features

    10. Optional cut-sheet feeder (CSF) for easy handling of cut sheets. The LQ-510 is equipped with the standard Epson 8-bit parallel interface. Various interface options allow prin- ting from a wide variety of computers, Table l-l lists the interface options, Table 1-2 lists the optional units available, and Figure l-l shows an exterior view of the printer.

  • Page 11: Figure

    GENERAL DESCRIPTION REV.-A (Printer Cover A) (Printer Cover B) Figure l-l. Exterior Views of the LQ-510 LQ-510...

  • Page 12: Specifications

    GENERAL DESCRIPTION REV.-A 1.2 SPECIFICATIONS This section describes the specifications for the LQ-510 printer. 1.2.1 HARDWARE SPECIFICATIONS Serial, impact, dot matrix Printing Method 24 wires (12 x 2, staggered, 0.2 mm diameter) Pin Configuration Wires (Column 1) Wires (Column 2) - ----- l+j- .t;...

  • Page 13: Table 1-3. Cut-Sheet Specifications

    REV.-A GENERAL DESCRIPTION Push Tractor Feed 1. Use the pull-out unit. 2. Do not perform reverse feeding for distances greater than 1/6 inch. 3. Accuracy of paper feed cannot be assured, and reverse feeding cannot be performed, after the paper end is detected.

  • Page 14: Figure 1-3. Label Dimensions

    GENERAL DESCRIPTION REV.-A Table 1-5. Envelope Specifications Size Number 6: 6.64 x 3.68 inches (166 x 92 mm) Number 10: 9.6 x 4.16 inches (240 x 104 mm) Quality Bond paper, xerographic paper, airmail Thickness 0.0063 to 0.0197 inch (0.16 to 0.52 mm) (Within the printing area, the thickness differential must not exceed 0.0098 inch [0.25 mm]).) 12 to 24 pounds (45 g/m...

  • Page 15: Figure 1-4. Printable Area For Cut Sheets

    REV.-A GENERAL DESCRIPTION Printable Area The figure below illustrates the printable area for cut sheets. 7 . 2 - 1 0 . 1 ” ( 1 8 2 - 2 5 7 m m ) Printable area .33” (8.5 or more ›...

  • Page 16: Figure 1-5. Printable Area For Continuous Paper

    GENERAL DESCRIPTION REV.-A 4 . 0 " - 1 0 . 0 " , 1 0 1 m m - 2 5 4 m m * 2 ) Printable area * 1 ) I_ Printable a r e a 9 mm, 0.35" or more - - - - - - - - - 9 m m , 0 .
  • Page 17 REV.-A GENERAL DESCRIPTION Ink Ribbon Model: 7753 ribbon cartridge Fabric Color: black Reliability: 2 million (LQ characters at 48 dots/character) Dimensions: 11.6 (width) x 1.36 (height) x 2.84 (depth) inches (290 mm x 34 mm x 71 mm) Model: 7768 ribbon cartridge Film Color: black Reliability: 2 million characters at 48 dots/character...

  • Page 18: Firmware Specifications (Esc/P)

    Character Sets Epson Roman (Family number: 0) Family Epson Sans Serif (Family number: 1) Epson Roman 10, Epson Roman 12, Epson Roman 15, Font Epson Roman Proportional Epson Sans Serif 10, Epson Sans Serif 12, Epson Sans Serif 15, Epson Sans Serif Proportional...

  • Page 19: Table 1-7. Printing Mode

    GENERAL DESCRIPTION REV.-A Table 1-7. Printing Mode Print pitch Pro- portional Pro- portional super/ subscript NOTES: 1. The value applies when only characters of maximum width are printed. “maximum” 2. The value applies when only characters of minimum width are printed. “minimum”...

  • Page 20: Table 1-8. Character Matrix And Character Size

    REV.-A GENERAL DESCRIPTION Table 1-8. Character Matrix and Character Size Character size Printing mode Face matrix Unit ESC sp H x V (mm) Draft 1.9 x 3.2 10-pitch 9 x 23 Draft 12-pitch 9 x 23 1.9 x 3.2 Draft 15-pitch 9 X 16 1.0 x 2.3 Draft 10-pitch, condensed...

  • Page 21: Figure 1-6. Character Matrix

    REV.-A GENERAL DESCRIPTION ( LQ) (Normal character) Ascender area Ascender area 30’ (a2) (a2) Descender area Descender area Face width (a1) Face width (a1) 29 dots (Normal LQ, excluding 15 pitch) 15 dots Character width (CW) (15 pitch and condensed LQ) Character width (CW) <...

  • Page 22: Figure 1-7. Data Transmission Timing

    GENERAL DESCRIPTION REV.-A The standard 8-bit parallel interface has the following specifications: Data Format 8-bit parallel Synchronization By STROBE pulse Handshaking By BUSY and ACKNLG signals Signal Level TTL-compatible Connector 57-30360 (Amphenol) or equivalent Data Transmission Timing See Figure 1-7. BUSY ACKNLG DATA...
  • Page 23 REV.-A GENERAL DESCRIPTION Table 1-9 Connector Pin Assignments and Signal Functions (Cont.) Pin No. Return Functional Description Signal Name Pin No. Dir. “HIGH” indicates paper out. This signal is effective only when the ERROR signal is “LOW.” SLCT Always “HIGH” output. (Pulled up to +5 V through 3.3K-ohm register.) AUTOFEED-XT If “LOW”...

  • Page 24: Table 1-10. Printer Select/Deselect Control

    GENERAL DESCRIPTION REV.-A Table 1-10 shows the printer select/deselect (DC1/DC3) control, including relations among ON-LINE, SELECT-IN input, DC1/DC3, and interface signals. Table 1-10. Printer Select/Deselect Control ACKNLG DATA ENTRY ON-LINE SW ERROR BUSY SLCT-IN DC1 / DC3 No pulse Disable Off-Line HIGH/LOW DC1 / DC3...

  • Page 25: Dip Switches And Jumper Setting

    GENERAL DESCRIPTION 4/3/91 1.4 DIP SWITCHES AND JUMPER SETTING This section describes the DIP switch selections and jumper setting for the LQ-510 printer. 1.4.1 DIP SWITCH SETTINGS The two DIP switches for the printer are located on the control panel, and function as shown in Tables 1-11 through 1-15.

  • Page 26: Jumper Setting

    GENERAL DESCRIPTION Tab& 1-14. Page Length Selection Table 1-14. Font Select&n (ROM Version TBD00A or Above (ROM Version SD6-W6 or Below or TAA04C or Below) or TBC00A or Above Table 1-15. Character Pitch Selection Character Pitch 2 - 7 (ln characters per inch) 1.4.2 JUMPER SETTING Jumper 10, which is user-selectable, is located inside the option board cover.

  • Page 27: Sheet Loading And Sheet Ejection

    REV.-A GENERAL DESCRIPTION 1.6 SHEET LOADING AND SHEET EJECTION The release lever enables disengaging of the push tractor unit drive mechanism. The printer therefore pro- vides some improved paper-handling functions through combination of the release lever and LOAD/EJECT control panel switch. Cut-Sheet Loading and Ejection To load a sheet of paper, position the paper-release lever back, place the sheet along the paper guide, and press the LOAD/EJECT switch.

  • Page 28: Operating Instructions

    GENERAL DESCRIPTION REV.-A 1.8 OPERATING INSTRUCTIONS This section describes the self-test and hexadecimal dump functions, error states, printer initialization, and buzzer operation. 1.8.1 SELF-TEST To begin self-test printing in draft mode, turn the printer on while depressing the LINE-FEED button. To begin printing in letter-quality (LQ) mode, turn the printer on while depressing FORM FEED.

  • Page 29: Figure 1-9. Hexadecimal Dump Function

    REV.-A GENERAL DESCRIPTION 1.8.2 HEXADECIMAL DUMP FUNCTION HEX dump mode is activated if the printer is switched on while both the LINE-FEED and FORM-FEED but- tons are depressed. When this mode is in effect, the hexadecimal representation of the input data is printed beside the corresponding printable ASCII characters.

  • Page 30: Table 1-16. Print Density

    REV.-A GENERAL DESCRIPTION 1.8.3 BIT-IMAGE PRINTING This printer offers the following four standard print densities (“dpi” indicates “dots per inch”): 120 dpi (including half dots): Triple speed 180 dpi (including half dots): Double speed 240 dpi (including half dots): 1.5 speed 360 dpi (including half dots): Normal speed The firmware implements the print densities as shown in Table 1-16.

  • Page 31: Error Conditions

    REV.-A GENERAL DESCRIPTION 1.8.4 ERROR CONDITIONS If any of the following error conditions are detected, the printer automatically enters off-line mode. 0 Home position is not detected at printer mechanism initialization. 0 Home position is detected during printing. ON LINE is pressed when the printer is already on line. This will switch the printer to off line. 0 When a paper-out signal is detected and forms-override is finished.

  • Page 32: Default Values

    GENERAL DESCRIPTION REV.-A 1.8.7 DEFAULT VALUES When the printer is initialized, the following default values and functions are set: Page Position The current paper position becomes the top-of-form position Left and Right Margin Released Line Spacing 1/6 inch Vertical Tabs Cleared Horizontal Tabs Every 8 characters (relative)

  • Page 33: Printer Protection For Heavy-Duty Printing

    REV.-A GENERAL DESCRIPTION 1.8.9 PRINTER PROTECTION FOR HEAVY-DUTY PRINTING The printer incorporates “printhead protection” to safeguard it from overheating and from the potential ill effects of a voltage drop to the head driver. If the temperature of the head exceeds a specified value, printing is automatically suspended.

  • Page 34: Main Components

    GENERAL DESCRIPTION REV.-A 1.9 MAIN COMPONENTS To facilitate maintenance and repair, the main components of the LQ-510 printer are designed so that they can be removed and replaced easily. The main components are: The main control board. The CPU, which is contained on 1) SAMA board: this board, controls all the main functions.

  • Page 35: Figure 1-12. Sama Main Control Board

    GENERAL DESCRIPTION REV.-A 1.9.1 SAMA BOARD The use of the pPD7810HG CPU simplifies the circuitry design of the main control board. E05A02 Gate Array (1A) PSRAM (5A) 27256 PROM (6A) 1MCG M10A17 or M10A20 Gate Array pPD7810HG CPU (5B) Figure 1-12. SAMA Main Control Board 1 - 2 6 LQ-510...

  • Page 36: Figure 1-13. Sanpnl Control Panel

    REV.-A GENERAL DESCRIPTION 1.9.2 SANPNL CONTROL PANEL The SANPNL control panel, which is the LQ-510’s control panel, contains the switches and the indicator LEDs illustrated below. Figure 1-13. SANPNL Control Panel LQ-510 1-27...

  • Page 37: Sanps(E) Board

    REV.-A GENERAL DESCRIPTION 1.9.3 SANPS(E) BOARD The power supply circuit (SANPS/SANPSE board), which is housed at the upper left of the lower case, con- sists of a line filter, fuse, power switch, and switching regulator circuit. It converts the AC line voltage to the + 24 V, + 12 V, - 12 V, and + 5 VDC voltages used by the printer.

  • Page 38: Figure 1-16. Housing

    REV.-A GENERAL DESCRIPTION 1.9.5 HOUSING The housing for the LQ-510 consists of upper and lower cases. The upper case houses the control panel. The lower case contains the printer mechanism and the main control board. The printer cartridge can be removed and replaced easily.

  • Page 39: Principles Of Operation

    PRINCIPLES OF OPERATION REV.-A CHAPTER 2 PRINCIPLES OF OPERATION OVERVIEW ..................Connectors Summary ............2.1.1 2.1.2 Outline of Printer Mechanism Operation ....... 2-3 2.1.2.1 Sensors ............... Motors ..............2.1.2.2 2.1.2.3 Printhead ............. 2.1.3 Circuit Overview ..............2-10 Overview of Power Supply Circuit ......2-10 2.1.3.1 Control Circuit Block Diagram ........
  • Page 40 PRINCIPLES OF OPERATION REV.-A 2-55 2.3.6 Printhead ................Printhead Printing Operation ......... 2-55 2.3.6.1 2.3.6.2 Printhead Specifications ........2-55 Printhead Drive Circuit Block Diagram....2-56 2.3.6.3 Gate Array E05A02 Operation in Printhead 2.3.6.4 Drive Circuit ............2-57 2.3.6.5 Printhead Drive Circuit .......... 2-56 2.3.6.6 Printhead Software Control ........
  • Page 41 PRINCIPLES OF OPERATION REV.-A Switching Circuit (During PCI Operation) ......2-20 Figure 2-23. 2-20 Over-Current Protection (OCP) .......... Figure 2-24. 2-21 + 5 VDC Regulator Circuit ..........Figure 2-25. 2-22 Oscillator Waveforms ............Figure 2-26. 2-22 Constant Voltage Control ..........Figure 2-27.
  • Page 42 PRINCIPLES OF OPERATION REV.-A Figure 2-63. Printhead Drive Circuit Block Diagram ......2-66 Figure 2-64. Printhead Drive Circuit ............. 2-57 Figure 2-65. Printhead Drive Waveforms ..........2-58 Figure 2-66. Print Timing ..............2-59 Figure 2-67. Relationship Between Head Driving Voltage and Print Driving Pulse Width ............

  • Page 43: Overview

    REV.-A PRINCIPLES OF OPERATION 2 2.1 OVERVIEW This chapter describes the signals at the connectors linking the primary components of the LQ-510. These components include the printer mechanism, power supply circuits, and control circuits. The chapter also describes the operation of the printer’s circuitry and printer mechanism. 2.1.1 CONNECTOR SUMMARY The interconnection of the primary components is illustrated in Figure 2-1.
  • Page 44 REV.-A PRINCIPLES OF OPERATION SANPNL-W Model 5710 Printer Mechanism Control Panel Board Friction/Tractor PG CR Head PE Home Sensor Sensor Motor 2-pin 2-pin 12-pin 15-pin 17-pin SAMA Board SANPS(E) BOARD Optional Interface SW Board Board AC IN Parallel I IF Serial I/F Host Computer NOTE:...

  • Page 45: Outline Of Printer Mechanism Operation

    REV.-A PRINCIPLES OF OPERATION 2.1.2 OUTLINE OF PRINTER MECHANISM OPERATION The Model 5710 printer mechanism is a serial, impact, dot-matrix mechanism that prints at 180 dots per inch (dpi) in both horizontal and vertical directions. Figure 2-2 shows a block diagram of the printer mechanism. TEMP Phase Phase...

  • Page 46: Sensors

    REV.-A PRINCIPLES OF OPERATION 2.1.2.1 Sensors The printer mechanism is equipped with the following sensors: Paper-End (PE) Sensor Home-Position (HP) Sensor Thermal Sensor (for sensing printhead temperature) Platen Gap (PG) Sensor Friction/Tractor Sensor Paper-End Sensor (PE Sensor) Figures 2-3 and 2-4 show the paper-end sensor. This sensor switch is ON when no paper is in place (e.g., when the paper supply has run out).
  • Page 47 PRINCIPLES OF OPERATION REV.-A Home-Position Sensor (HP Sensor) Figures 2-5 and 2-6 show the home-position sensor. The sensor switch is ON when the carriage is at the home position. Home position + ON + LOW Other positions + OFF + HIGH The reference position for the carriage drive is determined by this sensor.
  • Page 48 REV.-A PRINCIPLES OF OPERATION Thermal Sensor (Printhead Temperature Detection) The thermal sensor in the printhead monitors the printhead temperature. If the head temperature exceeds a specified upper limit, printing is automatically suspended. Printing resumes when the temperature drops to a specified lower value. Figure 2-8 illustrates the printer’s thermal-sensor circuit. P r i n t h e a d ‘...
  • Page 49 PRINCIPLES OF OPERATION REV.-A Platen Gap (PG) Sensor The PG sensor is ON whenever the adjust lever position is set to the fourth position or above. If the sensor is ON, printing will be in multiple copy mode, and the print speed will be relatively slow. Adjust Lever Position 1 to 3 -, OFF -, HIGH Adjust Lever Position 4 to 7 -, ON - LOW 2 nd position...
  • Page 50 REV.-A PRINCIPLES OF OPERATION Friction/Tractor Sensor The friction/tractor sensor detects the position of the release lever to determine whether tractor feed or fric- tion feed is in effect. Release Lever Position: Front - Friction Feed + OFF - HIGH level Release Lever Position: Rear + Tractor Feed -, ON + LOW level Rear Front...

  • Page 51: Motors

    PRINCIPLES OF OPERATION REV.-A 2.1.2.2 Motors This printer has the following motors: Carriage motor (stepper motor) Paper-feed motor (stepper motor) Carriage Motor The carriage motor is used to move the carriage right and left along the platen. This unit employs a four- phase, 48-step motor using either 1-2 or 2-2 phase excitation and is controlled by an open-loop system.

  • Page 52: Circuit Overview

    REV.-A PRINCIPLES OF OPERATION 2.1.3 Circuit Overview This section describes the circuitry. 2.1.3.1 Overview of the Power Supply Circuit The power circuit for this system is an SANPS(E) board. The circuit converts the AC power source to the + 24, + 5, and ± 12 VDC that the unit requires. To SAMA Board + +24VDC SANPS (120V Ver)

  • Page 53: Control Circuit Block Diagram

    PRINCIPLES OF OPERATION REV.-A 2.1.3.2 Control Circuit Block Diagram Figure 2-15 shows a block diagram of the control circuitry. ADDRESS MAPPING F000H A 0 0 0 H 0 0 0 0 H 4 0 0 0 H 8 0 0 0 H NOTE: CG = character generator.
  • Page 54 REV.-A PRINCIPLES OF OPERATION The control circuit consists mainly of the following ICs: 0 µPD7810HG CPU (5B) The µPD7810HG executes the program in the PROM (6A) and controls all the printer operations. Upon receiv- ing the RESET signal, the CPU begins executing the program from address 0000 hex. .

  • Page 55: Operation Of The Power Supply Circuit

    REV.-A PRINCIPLES OF OPERATION 2.2 OPERATION OF THE POWER SUPPLY CIRCUIT The power circuit used in the printer is either a 120 V SANPS board for the U.S., Taiwan, and the Middle East or a 220/240 V SANPSE board (for Europe, Asia, etc.). The basic operation of both boards is the same, however, and they are treated as one in this manual.

  • Page 56: Filter Circuit

    REV.-A PRINCIPLES OF OPERATION 2.2.2 FILTER CIRCUIT The input filter is a conventional LC filter circuit that functions both to dampen incoming noise and to prevent externally generated noise from running though the AC line. All the circuit’s coils and condensers are designed to withstand fluctuations in the incoming AC power.

  • Page 57: Rectifier And Smoothing Circuit

    PRINCIPLES OF OPERATION REV.-A 2.2.3 RECTIFIER AND SMOOTHING CIRCUIT The AC IN voltage from the filter circuit is full-wave rectified by diode bridge DB1, and converted to approx- imately 2 x AC IN voltage by smoothing capacitor C7. The + 24 VDC, + 5 VDC, and ± 12 VDC voltages are converted from this DC voltage.
  • Page 58 REV.-A PRINCIPLES OF OPERATION (5) Current in the primary winding increases, but because the potential at point 6 of coil 6-2 is fixed, Q1 base current I cannot surpass a specified level. As a result of this, the value of current Ic (= I ) flow- ing from coil 4-3 to the Q1 collector cannot surpass a maximum of hfe (1~).
  • Page 59 PRINCIPLES OF OPERATION REV.-A NOTE: items in parentheses refer to the 220/240 V version. Figure 2-20. Starting Circuit (Main Switching Circuit) LQ-510 2-17...
  • Page 60 REV.-A PRINCIPLES OF OPERATION Output C u r r e n t NOTE: Items in parentheses refer to the 220/240 V version. Figure 2-21. Main Switching Circuit Waveforms LQ-510 2-18...

  • Page 61: Vdc Voltage Control Circuit

    PRINCIPLES OF OPERATION REV.-A 2.2.5 +24 VDC VOLTAGE CONTROL CIRCUIT Figure 2-22 shows the + 24 VDC voltage control circuit. To maintain the correct voltage on the + 24 V line, the main switching transistor goes off if the voltage exceeds 24 V. If excess voltage occurs, reverse current flows through Zener diode ZD20, PC1 is activated, and the condition of the switching circuit is as shown in Figure 2-23.
  • Page 62 REV.-A PRINCIPLES OF OPERATION When PC1 is activated, the voltage at shunt regulator gap G reaches at least 2.5 V, K-A becomes a conduc- tor, Q3 goes on, Q2 goes on, and shunt transistor Q1 goes off. Even if PC1 is not activated, K-A will conduct if current I in the transformer’s primary winding surpasses a certain value, creating a potential difference of at least 2.5 V across resistance R4.

  • Page 63: Vdc Regulator Circuit

    PRINCIPLES OF OPERATION REV.-A 2.2.6 +5 VDC REGULATOR CIRCUIT Figure 2-25 shows the + 5 VDC Regulator Circuit. The + 5 VDC is generated from the + 24 VDC by a chopper- type switching regulator circuit utilizing a TL494. Through pin 13 of the output control terminal, the TL494 can cause the IC to operate in either push-pull or parallel mode.
  • Page 64 REV.-A PRINCIPLES OF OPERATION EA1 and EA2 in the IC are error amplifiers. EA2 is used to detect the output voltage. Figure 2-27 illustrates the setting of the output voltage. The rated voltage of Zener diode ZD23 is 5 V. Accordingly, 5 V is input at the negative terminal of EA2.
  • Page 65 PRINCIPLES OF OPERATION REV.-A EA1 is used to detect excessive output current. Figure 2-29 illustrates the mechanism. The output voltage is input to the negative terminal, and in order for equal voltage to appear at the positive terminal: (OUTPUT VOLTAGE) R34/(R39 // R34) = I R35 becomes the load current flow (see Figure 2-29).
  • Page 66 REV.-A PRINCIPLES OF OPERATION Pulse Width Modulation (PWM) Circuit Figure 2-30 shows the internal circuit of the TL494lC. The output control (pin 13) is fixed at “L,” and IC’s internal push-pull circuit is never used. The wired OR of the EA1 and EA2 outputs is input to the negative terminal of the PWM, a sawtooth waveform from the oscillator is input to the positive terminal, and the PWM modulated waveform is output as shown in Figure 2-31.
  • Page 67 PRINCIPLES OF OPERATION REV.-A 2.2.7 VOLTAGE LIMITING CIRCUIT Figure 2-32 shows the voltage limiting circuit. In this circuit, switching transistor Q1 goes off if the voltage on the + 24 V line reaches about + 30 V, or if the voltage on ‘the + 5 V line reaches about + 6 V. Zener diode ZD22 is used to detect abnormal voltage on the + 24 V line;...

  • Page 68: Vdc Supply Circuit

    REV.-A PRINCIPLES OF OPERATION 2.2.8 ± 12 VDC SUPPLY CIRCUIT The voltage from the transformer is rectified by D22 or D23, and + 12 VDC is produced. Theory suggests that load variations can cause large variations in the output voltage. In particular, output voltage may be quite high under no-load conditions.
  • Page 69 PRINCIPLES OF OPERATION REV.-A 2.3 PRINTER MECHANISM AND CONTROL CIRCUIT OPERATION This section describes the operation of printer mechanism and control circuit. 2.3.1 Vx VOLTAGE SUPPLY CIRCUIT When the +24 V power supply line reaches 11.6 V (11 V + 0.6 V), transistors Q33 and Q34 turn on and Vx (+ 5 V) is output.

  • Page 70: Reset Circuit

    REV.-A PRINCIPLES OF OPERATION 2.3.2 RESET CIRCUIT Figure 2-35 shows the reset circuit. The RESET signal generated here is sent to the RESET terminal of CPU µPD7810HG (5B) and to connector CN2-13 (optional interface), and serves as a hardware initialization signal. The RESET signal is output from the circuit when any of the following occur: a.

  • Page 71: Reset Output

    PRINCIPLES OF OPERATION REV.-A Power On or Off D4, R40, and C19 in Figure 2-35 comprise an ON/OFF RESET circuit. The purpose of this circuit is to cause the CPU to start from address 0000 hex. when power is applied and to prevent CPU malfunctions when the power is switched off.

  • Page 72: Reset Pulse Oscillation Process (Module Mounted)

    REV.-A PRINCIPLES OF OPERATION Module Installation or Removal Figure 2-37 shows the RESET pulse-generation process that occurs when a ROM cartridge is mounted. The bracketed numbers below correspond to the circled numbers in the figure. After the ROM cartridge is mounted, the LOW signal flows into the CAR terminal of gate array (7A), a LOW signal is correspondingly output from the DISC terminal ( 1 ), and RESET is output from the ROUT terminal ( 2 ).

  • Page 73: Reset Pulse Oscillation Process (Module Removed)

    PRINCIPLES OF OPERATION REV.-A When the ROM cartridge is removed (see Figure 2-38), the CAR terminal of the gate array (7A) receives a HIGH signal, the DISC terminal then outputs a LOW signal ( 1 ) and the ROUT terminal outputs a RESET signal ( 2 ).

  • Page 74: Init Signal Input Circuit

    REV.-A PRINCIPLES OF OPERATION Reset Caused by CPU A LOW signal from CPU port PB6 passes through the low-pass filter formed by R64 and C40 and inputs to pin 47 of the IC7A gate array. In the array, waveform shaping occurs and causes the DISC terminal to go LOW;...

  • Page 75: Address Decoder

    PRINCIPLES OF OPERATION REV.-A 2.3.3 ADDRESS DECODER AND BANK REGISTER The passages below describe the address decoder and bank register. Address Decoder This unit includes an address decoder in gate array E01 A05 (7A). The address decoder outputs a chip-select signal to the internal PROM (6A), external PROM, 4MCG (3A), 1MCG (4A), external CG, RAM (5A), HEAD gate array (1A) via address lines AB12 through AB15 and bank lines 7 and 6 (in the gate array).

  • Page 76: Bank Register

    PRINCIPLES OF OPERATION REV.-A Bank Register This unit has a bank register in gate array E01A05 (7A). The bank lines are set by writing to address F002 hex., and can be checked by reading the same address. GA E01A05 ( 7 A ) Bank ADDRESS Register...

  • Page 77: Carriage Mechanism

    REV.-A PRINCIPLES OF OPERATION 2.3.4 CARRIAGE OPERATION This section describes the carriage. 2.3.4.1 Carriage Mechanism The carriage mechanism includes the printhead, the carriage, the timing belt, the carriage motor, and the platen. Figure 2-42 shows the carriage mechanism. The timing belt is connected into the bottom of the carriage. The belt is driven by the carriage motor and moved via the belt-driven pulley.
  • Page 78 REV.-A PRINCIPLES OF OPERATION 2.3.4.2 Carriage Motor Specifications Specifications for the carriage motor are as follows: 4-phase, 48-pole stepper motor Type 24 V ± 10% Drive Voltage 36 ohms ± 7% at 77° F (25° C) Coil Resistance Maximum 0.34 A (rush current) Current Driving: 0.3 A (typical) (triple speed, 24 V) 0.23 A (typical) (double speed, 1.5 speed, normal speed, 24 V)
  • Page 79 REV.-A PRINCIPLES OF OPERATION 2.3.4.4 Gate Array E01A05 Operation in Carriage Drive Circuit The phase switching for the carriage motor (stepper motor) is performed by gate array E01A05 (7A). This gate array first sets the excitation system (2-2 phase or 1-2 phase) and rotation direction (clockwise or counterclockwise).

  • Page 80: Carriage Motor Drive Circuit

    REV.-A PRINCIPLES OF OPERATION 2.3.4.5 Carriage Motor Drive Circuit This unit utilizes an SLA7020M IC for the stepper motor drive. This IC causes the motor to be driven at the specified current. The current value is determined by the value of the external voltage input. Within the IC, the AB (AA) phase and the CD (BB) phase are completely differentiated and create identical circuits.
  • Page 81 PRINCIPLES OF OPERATION REV.-A NOTE: Phase CD is equivalent to the above. Figure 2-46. SLA7020M Circuit Diagram LQ-510 2-39...
  • Page 82 REV.-A PRINCIPLES OF OPERATION SLA7020M Phase Signal Input Circuit Although most stepper-motor control ICs input four-phase data directly, the SLA7020M requires a special type of phase data. In the case of 2-2 phase excitation, Figure 2-47 shows the excitation signal input circuit. The A-phase-side excitation signal input is via a single line.
  • Page 83 REV.-A PRINCIPLES OF OPERATION In the case of 1-2 phase excitation, Figure 2-49 shows the excitation signal input circuit. When the Td ter- minal is LOW, the SLA702M can cut off the output current. By using this function, the unaltered 2-phase excitation signal can cause the 1-2 phase excitation to be ON 3/8ths of the time, which is a suitable value.
  • Page 84 REV.-A PRINCIPLES OF OPERATION In order for this control to be performed easily, the circuit is constructed as shown in Figure 2-50. Further, if the CRENB signal is made HIGH, the Td terminal becomes LOW, and stepping of the motor is forced to stop. Figure 2-51.

  • Page 85: Reference Voltage Generation Circuit

    PRINCIPLES OF OPERATION REV.-A Reference Voltage Generation Circuit Figure 2-52 shows the reference voltage generation circuit, and Table 2-3 shows the reference voltages. The SLA7020M drives the stepper motor based on current proportional to the reference voltages set here. There are four stages of reference voltage values (motor drive current values), and these are switched to correspond to the drive speed of the motor.

  • Page 86: Constant Current Control Circuit

    PRINCIPLES OF OPERATION REV.-A Constant Current Drive Circuit The constant current drive circuit is shown in Figure 2-53 (for A-phase only), and the waveforms for each part are shown in Figure 2-54. In Figure 2-53, the reference voltage is indicated by this voltage deter- mines the peak current through resistance R6.
  • Page 87 REV.-A PRINCIPLES OF OPERATION c IP Figure 2-54. Waveforms The circuit’s constant current control process is shown above. Peak Current Detection (to - tl) (1) When excitation input IN goes ON, so does MOSFET Q1. The A-coil excitation current then flows along the route shown by the solid line (-).
  • Page 88 REV.-A PRINCIPLES OF OPERATION Chopper OFF Time (t1-t2) When Q1 goes OFF, reverse potential is generated in the motor coil, causing the coil current route to switch from I to I flow then causes current flow in R6 to change direction. COMP1 feedback voltage V (V-) thereby drops below and COMP1 again inverts.

  • Page 89: Carriage Motor Control

    PRINCIPLES OF OPERATION REV.-A 2.3.4.6 Carriage Motor Software Control This section describes the carriage motor software control. Excitation System The excitation system is determined by the firmware and is executed in accordance with the carriage speed, as shown in Table 2-4. The motor drive sequence for each excitation system is shown in Tables 2-5 and 2-6. Table 2-4.
  • Page 90 PRINCIPLES OF OPERATION REV.-A Since a stepper motor is used for the carriage motor, it is possible to hold at any position and switch printing direction. The carriage motor control system is an open-loop system, which switches the phases in accord- ance with set speeds.

  • Page 91: Home-Position Seek

    PRINCIPLES OF OPERATION REV.-A Home-Position Seek The control that causes the carriage to move to the home position when the power is turned on is called home-position seek. Figure 2-58 shows home-position seek operation. When power is applied, the printer executes 2-2 phase excitation for 20 or 30 ms (regardless of the phase- switching timing) and checks the HOME signal.
  • Page 92 REV.-A PRINCIPLES OF OPERATION Printing Area The printing area is defined as starting 23 phase-switching times following the home position. Acceleration Area Printing Area NOTE: pps = pulses per second dpi = dots per inch Figure 2-57. Printing Area and Printing Timing Abnormal Carriage Operation This unit does not employ a print timing signal (PTS) sensor and cannot detect abnormal carriage operation.

  • Page 93: Friction-Feed Operation

    PRINCIPLES OF OPERATION REV.-A 2.3.5 PAPER FEED This section describes the paper-feed operation. 2.3.5.1 Paper-Feed Mechanism Operation The paper-feed mechanism operates by friction feed for cut sheets and by the push tractor feed method for fanfold paper. Friction-Feed Operation The paper is held against the platen by two paper-feed rollers and by the printer cover. The paper-feed motor is driven to rotate the platen gear, via the paper-feed reduction gear, in the direction shown in Figure 2-58.

  • Page 94: Push-Tractor-Feed Operation

    PRINCIPLES OF OPERATION Push-Tractor-Feed Operation When the push tractor unit is used, paper is loaded so that its holes mesh with the tractor pins along the tractor belt. The paper-feed motor is driven and (via the pinion on the motor shaft) rotates the gears in the direction shown in Figure 2-59, rotating the tractor belts.

  • Page 95: Paper-Feed Motor Drive Circuit

    REV.-A PRINCIPLES OF OPERATION 2.3.5.3 Paper-Feed Motor Drive Circuit The paper-feed motor drive circuit is shown in Figure 2-60. The paper-feed motor is a stepper motor that can utilize either 2-2 phase or 1-2 phase excitation. When paper-feed signal PA4 is set to LOW, Q27 is turn- ed on, and +24 V is supplied to the motor.

  • Page 96: Paper-Feed Motor Drive Timing Chart

    REV.-A PRINCIPLES OF OPERATION 2.3.5.4 Paper-Feed Motor Software Control A four-phase, 48-step open-loop controlled motor is used to drive paper feeding. A 2-2 phase excitation is normally used for this printer, under which a one-step phase change drives the paper a distance of 1/180 inch.
  • Page 97 PRINCIPLES OF OPERATION REV.-A 2.3.6 Printhead This section describes printhead operation. 2.3.6.1 Printhead Printing Operation Dot-wire operation during printing is as follows: when the head-driving coil for a dot wire is energized, the actuating plate (which is engaged to one end of the dot wire) is attracted to the iron core, and drives the dot wire toward the platen.

  • Page 98: Printhead Drive Circuit Block Diagram

    REV.-A PRINCIPLES OF OPERATION 2.3.6.3 Printhead Drive Circuit Block Diagram Gate array E05A02 is used as an 8-bit x 3 data latch. The CPU determines the pulse width for the head-wire drive pulses from gate array E05A02 by monitoring the printhead drive power (+ 24 V line). The CPU also monitors the printhead temperature and suspends printing if the temperature becomes too high.
  • Page 99 PRINCIPLES OF OPERATION REV.-A 2.3.6.4 Gate Array E05A02 Operation in Printhead Drive Circuit The E05A02 gate array includes circuitry to interface the CPU and the printhead. This general-purpose gate array has special commands that lighten the load on the CPU when outputing printhead data. The gate array consists mainly of an 8-bit x 3 = 24-bit data latch.

  • Page 100: Printhead Drive Circuit

    REV.-A PRINCIPLES OF OPERATION 2.3.6.5 Printhead Drive Circuit The drive pulse width is adjusted using CPU port PC6. The Vx voltage is used to pull up the output signals from the gate array in order to prevent printhead malfunctions. P C 6 Figure 2-64.
  • Page 101 PRINCIPLES OF OPERATION REV.-A 2.3.6.6 Printhead Software Control During operation at 900 pulses per second (pps), one print cycle is performed at each phase-switching step to meet the specifications of the printhead (solenoid drive frequency: 900 Hz). The drive pulse width is ad- justed by using an A/D converter to detect the drive voltage and is kept within the area shown by the oblique lines in Figure 2-67.

  • Page 102: A/D Converter Circuit

    REV.-A PRINCIPLES OF OPERATION 2.3.7 A/D CONVERTER CIRCUIT Figure 2-68 shows the A/D converter circuit. The functions of this converter are as follows: Monitors the +24 V line to determine the drive pulse width for the printhead. 0 Monitors the temperature (the resistance value) of the printhead. Reads the initial DIP switch settings.
  • Page 103 PRINCIPLES OF OPERATION REV.-A Figure 2-68. A/D Converter Circuit LQ-510 2-61...
  • Page 104 PRINCIPLES OF OPERATION REV.-A Table 2-9 shows the relationship between the scan lines and DIP switches. Table 2-9. Scan Lines and DIP Switches 2-62 LQ-510...

  • Page 105: Host Interface

    PRINCIPLES OF OPERATION REV.-A 2.3.8 HOST INTERFACE The host interface circuit is shown in Figure 2-69. STROBE pulses from the host computer pass through the low-pass filter, consisting of R66 and C42, and flow into the STRB terminal. These pulses latch the parallel data and set the BUSY signal HIGH, so that subsequent data transfer is inhibited.

  • Page 106: Eeprom Circuit

    REV.-A PRINCIPLES OF OPERATION 2.3.9 EEPROM CIRCUIT The EEPROM can store the position of continuously fed paper, so that this information can be maintained even if power goes off. Figure 2-70 shows the EEPROM circuit. Note that this is external to the CPU’s memory space.

  • Page 107: Ribbon-Feed Mechanism

    PRINCIPLES OF OPERATION REV.-A 2.3.10 RIBBON-FEED MECHANISM The ribbon-feed mechanism consists of the ribbon cartridge and the ribbon-feed section. The ribbon-driving gear always is driven counterclockwise (regardless of the timing-belt direction) via the gear trains shown in Table 2-10. Table 2-10. Ribbon-Feed Gear Train Direction of Movement of Carriage Gear Train -, Platen gear...

  • Page 108: Table 1-1. Interface Options

    REV.-A OPTIONAL EQUIPMENT CHAPTER 3 OPTIONAL EQUIPMENT INTERFACE OPTIONS ..............3.1.1 Model 8143 Serial interface ..........MULTI-FONT MODULE (TOM4 BOARD) 3.3 C80612 CUT-SHEET FEEDER ............3.3.1 C80612 Cut-Sheet Feeder Specifications ....... 3-5 3.3.1.1 General Specifications .......... 3.3.1.2 Paper Specifications ..........3.3.1.3 Printable Area ............
  • Page 109 REV.-A OPTIONAL EQUIPMENT Figure 3-14. Removal of Sprocket Reduction Gear and Related Parts..3-18 Figure 3-15. Removal of Sprocket Mounting Plate L ......3-18 Removal of Sprocket Mounting Plate ........ 3-19 Figure 3-18. Direction of Paper Guide Roller Removal ......3-19 Figure 3-17.

  • Page 110: Model 8143 Serial Interface

    REV.-A OPTIONAL EQUIPMENT 3.1 INTERFACE OPTIONS The LQ-510 can utilize Model 8100 series optional interfaces. The main interfaces are listed in Table 3-1. Table 3-1. Optional Interfaces Description Model Max. Bit Rates X-ON /OFF RS-232C Buffer Size Flag Control Control Current Loop (bps) 8143...
  • Page 111 REV.-A OPTIONAL EQUIPMENT Jumper Settings Table 3-2. Jumper Settings DIP Switch Settings Table 3-3. DIP Switch Settings DIP SW No. Function 1-1 (JB3) Bit-rate selection See Table 3-4. 1-2 (J8/7) Data-length selection 7-bit 8-bit 1-3 (JB1) Bit-rate selection See Table 3-4. 1-4 (JB2) Bit-rate selection See Table 3-4.
  • Page 112 OPTIONAL EQUIPMENT REV.-A NOTE: For current loop operation, a data transfer rate greater than 1200 bps cannot be guaranteed. Handshaking Timing When the amount of buffer space for input data falls to 256 bytes, the printer indicates that it is “not ready to receive data”...

  • Page 113: Multi-Font Module (Tom4 Board)

    REV.-A OPTIONAL EQUIPMENT 3.2 MULTI-FONT MODULE (TOM4 BOARD) The optional multi-font module (7407) provides the LQ-510 with seven additional fonts. This module provides seven different font types (Courier, Prestige, Script, OCR-B, OCR-A, Orator, Orator-S). 2. “Orator” and “Orator-S” are new additions. 3.

  • Page 114: C80612 Cut-Sheet Feeder

    OPTIONAL EQUIPMENT REV.-A 3.3 C80612 CUT-SHEET FEEDER The LQ-510 printer can use the C80612 cut-sheet feeder. This cut-sheet feeder has the following features: 1. Cut sheets may be handled in the same way as fanfold paper. 2. Sheets may be inserted manually. 3.
  • Page 115 REV.-A OPTIONAL EQUIPMENT 3.3.1 C80612 CUT-SHEET FEEDER SPECIFICATIONS This section describes specifications for the C80612 cut-sheet feeder. 3.3.1.1 General Specifications Hopper Capacity: For paper weight of: ) ..........185 sheets maximum 17 pounds (64 g/m ) .

  • Page 116: Printable Area

    OPTIONAL EQUIPMENT REV.-A 3.3.1.3 Printable Area See Figure 3-3. .12” (3 mm) min. .12” (3 mm) min. Printable area -33” (8.5 mm) - Printable area Figure 3-3. Printable Area NOTES: The printable length is approximately 0.87 inches (22 mm) less than the actual page length. Paper- feed accuracy cannot be assured within 0.87 inches (22 mm) from either top or bottom edge.

  • Page 117: Dimensions And Weight

    OPTIONAL EQUIPMENT REV.-A 3.3.1.4 Dimensions and Weight Dimensions: 17.5 inches (444 mm) (width) x 17.1 inches (434 mm) (depth) x 16.4 inches (416 mm) (height) including paper-feed knob NOTE: Dimensions were measured with the cut-sheet feeder mounted on the printer. 17.1”...

  • Page 118: Operating Principles Of The Cut-Sheet Feeder

    OPTIONAL EQUIPMENT REV.-A 3.3.2 OPERATING PRINCIPLES OF THE CUT-SHEET FEEDER The cut-sheet feeder is driven by firmware incorporated in the printer. The feeder need not be electronically connected to the printer. Cut-sheet feeder mode can be selected either by DIP switch or by command. Selection by DIP Switch The cut-sheet mode is set by DIP switch as shown in the table below.

  • Page 119: Mechanism Operation

    REV.-A OPTIONAL EQUIPMENT 3.3.2.1 Mechanism Operation Paper is loaded between the paper holder and the paper-loading rollers. When the paper-feed motor rotates in reverse, the gears, via the pinion on the motor’s shaft, rotate in the direction of the white arrows (see Figure 3-5) and friction causes the paper to advance to the paper guide.

  • Page 120: Cut-Sheet Feeder Disassembly And Reassembly

    REV.-A OPTIONAL EQUIPMENT 3.3.3 CUT-SHEET FEEDER DISASSEMBLY AND REASSEMBLY This section describes the procedure for removing the hopper unit of the C80612 cut-sheet feeder. Unless otherwise specified, reassembly is performed by reversing the sequence. The diagrams in Figure A-34, which are provided as reference for disassembly and reassembly, show an exploded view of the parts configuration.
  • Page 121 REV.-A OPTIONAL EQUIPMENT 1. Remove side covers L and R. cover (L) Side Side Cover (R) Figure 3-6. Side Cover Removal 2. Remove the E-ring (6) on the paper-loading roller shaft, and then remove the shaft. E-ring (6) Paper Loading Roll Shaft Figure 3-7.
  • Page 122 REV.-A OPTIONAL EQUIPMENT 3. Remove the two E-rings (6) on the paper support shaft. E-ring (6) E-ring (6) Figure 3-8. E-Ring Removal 4. Remove the shaft holder fastening the paper support shaft to frame L. Shaft Holder Figure 3-9. Shaft Holder Removal LQ-510 3-13...
  • Page 123 OPTIONAL EQUIPMENT REV.-A 5. Remove the E-ring (6) on the paper support shaft (see Figure 3-10). 6. Lift the hopper unit and the paper support shaft together. Paper Loading Roller Shaft Holder ‘E-ring (6) Figure 3-10. Hopper Unit Removal 3-14 LQ-510...

  • Page 124: Preventive Maintenance For The Cut-Sheet Feeder

    3.3.4.2 Lubrication Epson recommends that the points indicated in Figures 3-11 and 3-12 be lubricated with Epson O-3 and G-14 (see Table 3-8). These lubricants have been thoroughly tested and have been found to comply fully with the needs of the cut-sheet feeder.
  • Page 125 REV.-A OPTIONAL EQUIPMENT Figure 3-12. Lubrication Points (2) 3-16 LQ-510...

  • Page 126: C80006 Pull Tractor

    REV.-A OPTIONAL EQUIPMENT 3.4 C80006 PULL TRACTOR The optional C80006 pull tractor provides optimum continuous paper handling. The pull tractor is especially useful with continuous multi-part forms and labels. 3.4.1 PULL TRACTOR OPERATION When using the push-pull feed method, fit the paper holes onto the pins along the sprocket wheel and also onto the tractor pins along the tractor belt.
  • Page 127 OPTIONAL EQUIPMENT REV.-A 3.4.2 PULL TRACTOR DISASSEMBLY AND REASSEMBLY 1. Remove the catch fastening the sprocket reduction gear to sprocket mounting plate R. Then remove the reduction gear. 2. From the sprocket shaft, remove the E-ring (6), the sprocket gear, the sprocket gear spring, and the washer. 3.
  • Page 128 REV.-A OPTIONAL EQUIPMENT 5. Remove the E-ring (6) from the sprocket shaft, then remove sprocket mounting plate R. Sprocket Mounting Plate Figure 3-16. Removal of Sprocket Mounting Plate 6. From the sprocket shaft and the sprocket support shaft, pull and remove sprocket set R, the paper guide roller, and sprocket set L.
  • Page 129 OPTIONAL EQUIPMENT REV.-A Reassembly Insertion of the paper guide roller onto the sprocket shaft should be in the direction indicated in Figure 3-18. 2. When inserting the sprocket roller into the sprocket shaft, the marked sides of both wheels should face to the left, and the markings should be analogously positioned.
  • Page 130 REV.-A DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT CHAPTER DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT GENERAL REPAIR INFORMATION ........... 4.2 DISASSEMBLY AND REASSEMBLY ..........4.2.1 Printhead Removal .............. 4.2.2 Removal of Cases ............... 4.2.2.1 Upper Case Removal ..........Control Panel (SANPNL) Board Removal....4-7 4.2.2.2 4.2.3 Removal of Circuit Boards ...........
  • Page 131 REV.-A DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT Control Panel Removal ............Figure 4-7. SAMA Board Removal ............Figure 4-8. Cable ................Figure 4-9. SANPS(E) Board Removal ..........4-10 Figure 4-10. 4-11 Printer Mechanism Removal ..........Figure 4-11. Removal of Paper Tension Unit Cover ....... 4-11 Figure 4-12.

  • Page 132: Disassembly, Assembly, And Adjustment

    DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT REV.-A LIST OF TABLES Repair Tools ..............Table 4-1. Measuring Instruments ............Table 4-2. Abbreviations for Small Parts ..........Table 4-3. Form and Abbreviated Part Name of Screw......4-2 Table 4-4. 4-29 Draft Mode ..............Table 4-5.

  • Page 133: General Repair Information

    REV*iils~ss~~~~~, ADJUSTMENT ASSEMBLY 4.1 GENERAL REPAIR INFORMATION This chapter describes the procedures for removing, replacing, and adjusting the main components of the LQ-510. CAUTION 0 Prior to beginning any of these procedures, be certain that the AC power cord is disconnected. help prevent hands from being cut by the printer mechanism or sharp plate edges, wear gloves when performing these procedures.
  • Page 134 DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT REV.-A In referring to small parts, this manual utilizes the abbreviations listed in Table 4-3. Table 4-3. Abbreviations for Small Parts Abbreviation Description CBB(c) Cross-recessed Bind head, Cone point, B-tight screw CBS(c) Cross-recessed Bind head, Cone point, S-tight screw Table 4-4 correlates the forms of the screws with their abbreviated part names.

  • Page 135: Disassembly And Reassembly

    REV.-A DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT 4.2 DISASSEMBLY AND REASSEMBLY This chapter details the disassembly procedures for the LQ-510. As a rule, reassembly is performed simply by reversing the disassembly procedures. A number of special notes, however, are provided under the heading “Notes for Reassembly.”...
  • Page 136 AND ADJUSTMENT DISASSEMBLY, ASSEMBLY, REV.-A 3. Unlock the two levers securing the printhead to the carriage by pulling them down. Then lift and remove the printhead. Printhead Head Cable Figure 4-2. Printhead Removal 4. Disconnect the head cables from the connector on the printhead. NOTE: For the European version of the printer, a net is mounted on the printhead.

  • Page 137: Removal Of Cases

    REV.-A DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT 4.2.2 REMOVAL OF CASES This section details the procedure for removing the upper case and the control panel (SANPNL). 4.2.2.1 Upper Case Removal 1. Remove the sheet guide assembly, printer cover, and paper-feed knob. 2. Push in the two notches securing the push tractor to the printer mechanism, and remove the push trac- tor from the printer mechanism.
  • Page 138 REV.-A DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT 3. Insert a standard screwdriver into each of the two holes at the front of the lower case, and gently push (see Figure 4-5) to unlock the notches. (see Figure 4-5) to unlock the notches. Upper Case Guide Upper Case Guide notch can be unlocked by...
  • Page 139 DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT REV.-A 4.2.2.2 Control Panel (SANPNL) Removal 1. Remove the upper case (as described in the previous section). 2. Turn the upper case over, push in the two notches on the case that secure the control panel to it, and remove the control panel.

  • Page 140: Removal Of Circuit Boards

    REV.-A DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT 4.2.3 REMOVAL OF CIRCUIT BOARDS This section describes the procedure for removing the SAMA board and the SANPS(E) board. 4.2.3.1 SAMA Board Removal 1. Remove the upper case (refer to Section 4.2.2.1). The following connectors on the SAMA board, connec- ting it to external components, should be disconnected: CN5 (red), CN6 (yellow), CN7 (white), CN8 (flexible flat cable, or “FFC”), CN9 (FFC), CN13 (black), CN12 (white), CN11 (white), and CN10 (white).
  • Page 141 REV.-A DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT 3. Remove the CBB(c) (M3 x 10) screw and the CBS(c) (M3 x 8) screw securing the SAMA board to the base plate and the lower case. 4. Loosen the four bent tabs on the lower case, securing it to the SAMA board. Then remove the SAMA board. to cause damage to components on the SAMA board.

  • Page 142: Sanps(E) Board Removal

    REV.-A DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT 4.2.3.2 SANPS(E) Board Removal 1. Remove the upper case (refer to Section 4.2.2.1). 2. Disconnect connector CN1 from the SANPS(E) board. This connector connects the board to the power switch. 3. Disconnect connector CN2 from the SANPS(E) board. This connector connects the board to the SAMA board.

  • Page 143: Removal Of Printer Mechanism

    DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT REV.-A 4.2.4 REMOVAL OF PRINTER MECHANISM This section describes the removal of the platen unit, paper guide, and printer mechanism. The platen unit and paper guide are removed first to enable quick and easy removal of the printer mechanism. Figure 4-11.
  • Page 144 REV.-A DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT 3. Remove the paper tension unit. a. Lift up gently on the locking tabs at the rear left and right ends of the paper tension unit to release unit from the printer mechanism. b. Roll paper tension unit toward printhead and lift straight up. Figure 4-13.
  • Page 145 DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT REV.-A 5. Disconnect the cable from CN13 on the SAMA board. 6. Unlock the two notches of the paper guide by pushing them forward from the rear side of the printer mechanism. Remove the paper guide. Guide Figure 4-15.

  • Page 146: Removal Of Printer Mechanism

    DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT REV.-A 4.2.4.2 Removal of Printer Mechanism 1. Remove the platen unit and paper guide (see Section 4.2.4.1). 2. Disconnect the cables from the following connectors on the SAMA board: CN5 (red), CN6 (yellow), CN7 (white), CN8 (flexible flat cable, or “FFC”), CN9 (FFC), and CN12 (white). Refer to Figure 4-8. 3.

  • Page 147: Disassembly Of Printer Mechanism

    REV.-A DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT 4.2.5 DISASSEMBLY OF PRINTER MECHANISM This section details the removal of components from the printer mechanism. Figure A-32 shows an exploded diagram of the printer mechanism, illustrating the various components. Table A-22 lists the components by name.
  • Page 148 DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT REV.-A 3. Loosen the two tabs securing the paper guide plate and spacer to the frame, and lift and remove the plate. Spacer Figure 4-18. Removal of Paper Guide Plate NOTES FOR REASSEMBLY When remounting the paper guide plate and spacer to the frame, refer to Figure 4-19 for the mounting direction. Figure 4-19.

  • Page 149: Release/Tractor Sensor

    DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT REV.-A 4.2.5.2 Removal of Paper-Feed Motor, Release Lever, and Release/Tractor Sensor 1. Remove the printer mechanism (refer to Section 4.2.4). 2. Disconnect the motor cable from the paper-feed motor. 3. Loosen the two bent tabs on the frame securing the paper-feed motor, and remove the paper-feed motor. Frame (R) .Feed Motor Bent Tabs...
  • Page 150 REV.-A DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT 5. From the inside of the frame, push the notch of the release lever outward. Remove the release lever. Lever Figure 4-22. Removal of the Release Lever 6. Push the two notches securing the release/tractor sensor, and remove the sensor. Push Figure 4-23.

  • Page 151: Removal Of Paper-End Sensor

    TROUBLESHOOTING REV.-A 4.2.5.3 Removal of Paper-End Sensor 1. Remove the platen unit and paper guide (refer to Section 4.2.4.1). 2. Loosen the tab securing the paper guide. Using point A (refer to the figure below) as a fulcrum, rotate the sensor in the direction indicated by the arrow, and remove it. Notch Figure 4-24.

  • Page 152: Removal Of Carriage Unit

    REV.-A DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT 4.2.5.5 Removal of Carriage Unit Remove the printer mechanism (refer to Section 4.2.4). Remove the printhead and disconnect the head cable. Turn the printer mechanism upside down, and manually move the carriage unit until it is at the cut-out section of the carriage motor frame, The joint of the carriage unit and timing belt should be visible through the cut-out.
  • Page 153 REV.-A DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT 6. Turn the printer mechanism over so that it is again face up. Rotate the lever on the left side of the car- riage guide shaft counterclockwise, and pull it out through cut-out A. Rotate the lever on the right side of the guide shaft clockwise, and remove it in the same way.
  • Page 154 REV.-A DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT NOTES FOR REASSEMBLY 1. When reinstalling, position the carriage guide shaft and the head adjust lever as shown in Figure 4-30. riage Guide Shaft Figure 4-30. Carriage Guide Shaft and Head Adjust Lever 2. The lever for the left side of the guide shaft is gray; the lever for the right side is black. Slide each lever onto the appropriate side of the shaft.

  • Page 155: Removal Of Carriage Motor

    REV.-A DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT 4.2.5.6 Removal of Carriage Motor Perform steps 1 to 5 of Section 4.2.5.4. 2. Disconnect the motor cable from the carriage motor. Disconnect the lead wire of the home-position sen- sor from the molded clip at the bottom of the frame. (Refer to Figure 4-31.) 3.

  • Page 156: Removal Of Home-Position Sensor

    DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT REV.-A NOTES FOR REASSEMBLY The following apply to E-ring reattachment: 0 When attaching a ring to the left pulley shaft, place it so that its opening faces left. 0 When attaching a ring to the right pulley shaft, place it so that its opening faces right. 0 Use tweezers to check that the attached retaining rings are firmly in place and will not move.

  • Page 157: Disassembly Of Tractor Unit

    REV.-A DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT 4.2.5.9 Disassembly of the Tractor Unit 1. Remove the E-ring on the tractor shaft. 2. Pull and remove the tractor shaft from the tractor frame. 3. Pull and remove the sprocket guide shaft from the tractor frame. Tractor Frame (L) Figure 4-35.
  • Page 158 REV.-A DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT NOTES FOR REASSEMBLY When reassembling, align the phases as shown below. Figure 4-37. Tractor Phase Alignment LQ-510 4-26...

  • Page 159: Adjustment

    DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT 4.3 ADJUSTMENT This section describes the adjustment procedures necessary when the LQ-510 printer is reassembled or when parts are reinstalled or replaced. These procedures are necessary to ensure the correct operation of the printer. 4.3.1 PLATEN GAP ADJUSTMENT Following the removal of the carriage guide shaft or carriage guide shaft levers, or if printing is abnormal, adjust the gap between the platen and the printhead.
  • Page 160 REV.-A DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT 0.45 ± 0.01mm Printhead Platen Figure 4-39. Platen Gap Adjust Lever Carriage Guide Shaft Lever (Left) Frame (Left Side) Figure 4-40. Carriage Guide Shaft Lever Movement Clockwise rotation widens gap. Carriage guide shaft (left): Counterclockwise rotation narrows gap. Clockwise rotation narrows gap.

  • Page 161: Adjustment Of Bidirectional Printing Alignment

    REV.-A DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT 4.3.2 ADJUSTMENT OF BIDIRECTIONAL PRINTING ALIGNMENT This this type of adjustment must be performed when bidirectional printing results in misaligned lines or characters. This adjustment is also required following replacement of the SAMA board or of the printing mechanism.

  • Page 162: Adjustment Procedures

    REV.-A DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT Table 4-6. LQ Mode Direction and Value of Shift Control DIP SW Value 7/720 inch 6/720 inch 5/720 inch *---a 4/720 inch Printing starts n/720 inch to /720 inch 2/720 the left of the reference inch 1/720 inch...
  • Page 163 DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT REV.-A Load paper. Set the DIP switches as required for center adjustment, and per- form P-step pattern printing (refer to Figure 4-43). Do consecutive lines fail to line up perfectly right- Right Left to-left i.e., are even and odd number lines misaligned horizontally? Pressing the LF switch once ad-...
  • Page 164 DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT REV.-A SW Adjustment SW1-5 ON 1-6 ON 1-7 OFF 1-8 OFF Figure 4-42. Bidirectional Adjustment Pattern LQ-510...

  • Page 165: Troubleshooting

    TROUBLESHOOTING REV.-A CHAPTER 5 TROUBLESHOOTING GENERAL ..................5.2 UNIT REPLACEMENT ..............5-10 5.3 UNIT REPAIR ................. SANPS/SANPSE Power Board Unit Repair ......5-10 5.3.1 5-14 SAMA Control Board Unit Repair .......... 5.3.2 Printer Mechanism Unit Repair ..........5-21 5.3.3 LIST OF FIGURES Printhead Resistance .

  • Page 166: Unit Replacement

    REV.-A TROUBLESHOOTING 5.1 GENERAL Troubleshooting is based on the concept that error symptoms vary according to the defective component. Troubleshooting may involve either unit replacement or unit repair, each of which is treated separately below. First try to determine the defective unit by referring to Section 5.2. The flow charts in the section should help you isolate the defective unit.
  • Page 168 T R O U B L E S H O O T I N G REV.-A (1) Printer Fails to Operate with Power Switch on Use correct AC input voltage. Replace the fuse and F1 on the SANPS(E) and disconnect CN2 on ON again.
  • Page 169 TROUBLESHOOTING REV.-A (2) Abnormal Carriage Operation connecting the SAMA circuit Secure board and the printer connectors mechanism. Replace the SAMA circuit board. LQ-510...
  • Page 170 TROUBLESHOOTING REV.-A (3) Faulty Printing During Self-Test, but Carriage Operation is Normal Set the gap adjustment lever at the second posi- tion and perform self-test. Reinsert the; correctly. measurement Replace the SAMA Replace the printherd. circuit board. Replace the SAMA circuit board.
  • Page 171 REV.-A TROUBLESHOOTING x220 II240 < Wire Assignment > Coil Resistance: 1 9 . 1 kl.0 a t 2 5 ° C (Between each dot wire and common.) TEMP2 #20 #12 #24 #9 #1 @ @ @ @$I@,@ @ @ @@@@@@@@@ d--d C O M .
  • Page 172 TROUBLESHOOTING REV .-A (4) Abnormal Paper Feed (but Normal Printing) Load the paper correctly. Replace the printer mechanism. Replace the SAMA circuit board. 5 - 7 L Q - 5 1 0...
  • Page 173 REV.-A TROUBLESHOOTING (5) Abnormal Control Panel Operation Reinsert connector CN4 correctly. Replace the SAMA circuit board, Replace the control panel. Replace the control Replace the SAMA circuit board? LQ-510...
  • Page 174 TROUBLESHOOTING REV.-A (6) Faulty Printing in ON-LINE Mode NOTE: It is assumed here that the host computer is operating normally. Perform self-test. SAMA Replace the circuit board. LQ-510...
  • Page 175 REV.-A TROUBLESHOOTING 5.3 UNIT REPAIR This section indicates the points to be checked in response to problems and the measures to be taken based on the result of the check. Utilize the checkpoints to determine and correct defective components. Tables 5-5, 5-7, and 5-9 below are divided into the five following columns: Problem: Indicates the difficulty.
  • Page 176 REV.-A TROUBLESHOOTING Table 5-5. SANPS(E) Power Board Unit Repair Problem Symptom Cause Checkpoint Solution Printer The +24V Measure the resistance of T1 transformer coils. Replace T1 . Transformer does not line is dead. oils are 4-3, 6-2,11-12. operate at open. all.
  • Page 177 REV.-A TROUBLESHOOTING Table 5-5. SANPS(E) Power Board Unit Repair (Cont.) Checkpoint Solution Problem Symptom Cause Printer does The voltage The + 24 V Check the + 24 V line. not operate at +5 V line line is dead. at all. is dead.
  • Page 178 REV.-A TROUBLESHOOTING Table 5-5. SANPS(E) Power Board Unit Repair Solution Problem Symptom Cause Checkpoint Printer does Voltage on The +24V Check the +24 V line. not operate ±12V power at all. line is dead. supply circuit is dead. Fuse Measure the resistance values of R31 and R32. Replace either R31 resistor R31...
  • Page 179 REV.-A TROUBLESHOOTING 5.3.2 SAMA CONTROL BOARD UNIT REPAIR The following chart shows the main components on the SAMA board. Table 5-6. SAMA Board Parts List Part No. Location Part ID Description X400078101 µPD7810HG E01A05 Gate Array Y566800009 Y453800004 E05A02 Gate Array HM65256BLSP-12 X400062565 PSRAM...
  • Page 180 REV.-A TROUBLESHOOTING Table 5-7. SAMA Board Unit Repair Problem Symptom Cause Checkpoint Solution Printer does CPU is not Vx voltage Check voltage waveforms for the Vx voltage and for Replace operate at operating. is not being the 24 V line. ZD1, Q33, all.
  • Page 181 REV.-A TROUBLESHOOTING Table 5-7. SAMA Board Unit Repair (Cont.) Problem Symptom Cause Checkpoint Solution Printer does CPU is not Selection of Check pin 2 of IC7A for a changing signal HIGH/LOW. Replace operate at operating. control ROM IC7A. all. is abnormal. Either ROM Replace or RAM is...
  • Page 182 TROUBLESHOOTING REV.-A Table 5-7. SAMA Board Unit Repair (Cont.) Solution Problem Symptom Checkpoint Cause Replace Carriage Carriage IC7A is At IC7A, check the input waveform at pin 59 and the IC7A. operates does not defective. output signals at pins 60, 61, 62, and 63. abnormally.
  • Page 183 REV.-A TROUBLESHOOTING Table 5-7. SAMA Board Unit Repair (Cont.) Checkpoint Solution Problem Symptom Cause Replace Self-test CPU cannot Measure voltage at VAref (pin 42) of IC5B. The normal Self-test IC6B. voltage is 4.75 V. printing is printing is measure abnormal. voltage on the 24 V executed.
  • Page 184 REV.-A TROUBLESHOOTING Table 5-7. SAMA Board Unit Repair (Cont.) Problem Symptom Cause Checkpoint Solution Self-test A particular IC1A is Check the printhead drive signal at IC1A. Replace printing dot is not defective. IC1A. abnormal. being printed. A printhead Check the printhead drive transistor corresponding Replace the drive tran- to the dot.
  • Page 185 REV.-A TROUBLESHOOTING Table 5-7. SAMS Board Unit Repair (Cont.) Problem Checkpoint Solution Symptom Cause Paper is not Paper feed Paper feed Check the paper-feed motor drive signal and paper-feed Replace the fed normally. pitch is paper-feed motor drive motor drive transistor. abnormal motor drive transistor is...
  • Page 186 TROUBLESHOOTING REV.-A 5.3.3 PRINTER MECHANISM REPAIR For detailed procedures for replacing or adjusting parts, refer to Sections 4.3, Disassembly and Reassembly, and 4.4, Adjustment. If a problem or symptom recurs following an attempted repair, refer to the tables to try to find other potential causes. Table 5-8.
  • Page 187 REV.-A TROUBLESHOOTING Table 5-8. Printer Mechanism Repair (Cont.) Solution Checkpoint Problem Symptom Cause Replace the Measure coil resistance of the printhead. The normal Self-test A particular Printhead is printhead. printing is dot fails to defective. value is approx. 19.1 ohms. abnormal.
  • Page 188 REV.-A TROUBLESHOOTING Table 5-8. Printer Mechanism Repair (Cont.) Problem Symptom Checkpoint Solution Cause Dismount the ribbon cartridge, rotate its knob manually, Replace the Ribbon feed Ribbon is Ribbon car- s defective. not fed. tridge is and check whether the ribbon feeds normally. ribbon cartridge.
  • Page 189 REV.-A MAINTENANCE CHAPTER 6 MAINTENANCE PREVENTIVE MAINTENANCE ............6-1 LUBRICATION AND ADHESIVE APPLICATION .

  • Page 190: Preventive Maintenance

    The lubricants - EPSON O-2, EPSON G-20, EPSON G-26, and EPSON G-37 - have all been thoroughly tested and fully meet the needs of this printer. (Table 6-1 lists details of these lubricants.) Before applying any lubricant, make sure that the part to be lubricated is clean.
  • Page 191 MAINTENANCE REV.-A Table 6-2. Lubrication Points (Refer to Figure 6-3) Ref. No. Lubrication Points Lubricant G-26 Shaft that holds paper-feed reduction G-26 Contact portion of sub paper release lever and paper release lever Oil pad Carriage guide shaft (at both left and right sides of carriage) G-26 Carriage guide plate (the portion that contacts the carriage) G-26...
  • Page 192 MAINTENANCE REV .-A L -. - - - - - - - - -----__ .--. Figure 6-3. LQ-510 Lubrication Points LQ-510...
  • Page 193 REV.-A APPENDIX APPENDIX INTEGRATED CIRCUITS WITHIN THE LQ-510 ........A-1 A.1.1 SAMA Board Main Components ........... CPU µPD781OHG (5B) ........... A.1.1.1 A.1.1.2 E01A05 (7A) ............A.1.1.3 E05A02 (1A) ............A.1.1.4 HM65256BLSP (5A)..........A-10 A.1.1.5 SLA7020M (2B) ............ A-11 A.1.1.6 S-2940I (4B) ............A-12 A-14 A.1.1.7...
  • Page 194 APPENDIX REV.-A Figure A-21. 74LS152 Internal Circuit ..........A-15 Figure A-22. TL494 Block Diagram ............A-16 Figure A-23. SANPS Board Component Layout........A-17 Figure A-24. SANPS Board Circuit Diagram.......... A-18 Figure A-25. SANPSE Board Component Layout ........A-19 Figure A-26.

  • Page 195: Integrated Circuits Within The

    REV.-A APPENDIX This appendix provides detailed information about the integrated circuits, signal functions, capabilities, and other aspects of the components of the LQ-510 printer. A.1 INTEGRATED CIRCUITS WITHIN THE LQ-510 This section describes the integrated circuits in the LQ-510. A.1.1 SAMA BOARD MAIN COMPONENTS Table A-l shows SAMA board ICs.
  • Page 196 REV.-A APPENDIX A.1.1.1 CPU µPD7810HG (5B) The µPD7810/7811HG is comprised of an 8-bit timer counter, an 8-bit A/D converter, 256 bytes of RAM, and a serial interface. A system can be constructed easily with this IC, whose main features are listed below. 256 bytes of built-in RAM (addresses FF00-FFFF hex.) 0 4096 bytes mask ROM (addresses 0-0FFF hex.) for the 7811 CPU 0 Direct addressing of up to 64K...
  • Page 197 ’ i2r MAIN PROGRAM MNI 0 MEMORY DATA INTl 0 (4K-BYTE) MEMORY PC7-0 (pPD7811) (256-BYTE1 DATA INTERNAL PB7-0 PA7-0...
  • Page 198 REV.-A APPENDIX Table A-3. µPD7811 PF Operation External Memory 256 bytes (max.) 4K (max.) 16K (max.) 60K (max.) Table A-4. µPD7810 PF Operation LQ-510...
  • Page 199 APPENDIX REV.-A Table A-5. µPD7810/7811 Port Functions Pins Descriptions Signal Direction Port A: 8-bit l/O with output latch. l/O possible with mode A PA0-7 In/Out (MA) register. Output HIGH. 9-16 PB0-7 In/Out Port B: 8-bit I/O with output latch. l/O possible with mode B (MB) register.
  • Page 200 APPENDIX REV.-A CPU Timing Refer to Figures A-3 through A-5 for CPU timing diagrams. Three oscillations define one state. The OP code fetch requires four states. During T1 to T3, program memory is read, and instructions are interpreted during T4. Address bus lines 15-8 are output from T1 to T4. Address bus lines 7-0 (PD7-0) are used in the multiplex mode.

  • Page 201: E01A05 (7A

    APPENDIX REV.-A A.1.1.2 E01A05 (7A) This gate array was newly developed for this printer. Its functions are as follows: 1. Parallel I/F 2. Address decoder 3. Bank register 4. Data address multiplexer 5. Reset 6. CR motor control Figure A-6 shows the E01A05 pin diagram; Table A-6 shows pin functions for the E01A05. Figure A-6.
  • Page 202 APPENDIX REV.-A Table A-6. E01A05 Pin Functions LQ-510...

  • Page 203: E05A02 (1A

    APPENDIX REV.-A A.1.1.3 E05A02 (1A) This gate array was developed for 24-pin dot-matrix printers and is used to simplify the interface between the CPU and the printhead. Figure A-7 shows the E05A02 pin diagram; Table A-7 shows the pin functions. Figure A-7.
  • Page 204 REV.-A APPENDIX A. 1.1.4 HM65256BLSP (5A) The HM65256BLSP is a 32K-word x 8-bit pseudo-static RAM (PSRAM) which features low power consump- tion (because CMOS peripheral circuits are used) and high speed and capacity (because a single transistor memory cell is used). The pin diagram of the HM65256BLSP is provided in Figure A-8, and a block diagram in Figure A-9.

  • Page 205: Sla7020M (2B

    REV.-A APPENDIX A.1 .1.5 SLA7020M (2B) The SLA7020M is a two-circuit, 4-phase stepper motor driver for unipolar, constant current driving. ,n,n,ngn,n,n, 1 2 3 4 5 6 7 6 9 10 11 12 13 14 15 Figure A-10. SLA7020M Case Outline Drawing QVCC - _- Figure A-11.

  • Page 206: S-2940I (4B

    APPENDIX REV.-A A.1.1.6 S-2940I (4B) The S-2940I is a 16 x 8-bit EEPROM. The pin diagram is given in Figure A-12, and the block diagram in Figure A-13; Table A-8 lists and describes the commands. S 2 9 4 0 Figure A-12.
  • Page 207 APPENDIX REV.-A Figure A-14. Timing Chart (Read) Figure A-15. Timing Chart (Write) A-13 LQ-510...

  • Page 208: Tl431Clpb (6B

    REV.-A APPENDIX A.1.1.7 TL431CLPB (6B) The TL431 is a high-accuracy, temperature-compensated shunt regulator. The output voltage can be set anywhere between 2.5 V and 36 V through addition of two external resistors. The TL431 is highly stable and outputs a large current, so that it is capable of replacing various Zener diodes. The TL431 is especially suitable for driving the photodiode in the photocoupler section of the feedback circuit used in the RCC system switching regulator.

  • Page 209: Ttl

    REV.-A APPENDIX A.1.1.8 TTL The internal circuitry of the TTLs is shown below. Figure A-19. 74LS07 Internal Circuit Figure A-18. 74LS06 Internal Circuit DATA INPUTS DATA SELECT Figure A-20. 74LS38 Internal Circuit Figure A-21. 74LS152 Internal Circuit LQ-510 A-15...

  • Page 210: Sanps/Sanpse Board Main Components

    REV.-A APPENDIX A.1.2 SANPS/SANPSE Board Main Components Table A-9 shows SANPS/SANPSE board ICs. Table A-9. SANPS/SANPSE Board ICs Location Name of IC Type Adjustable precision shunt regulator L5431 T L 4 9 4 Pulse-width modulation control I C 2 0 4.1.2.1 TL494 (IC20) The TL494 provides pulse-width modulation control.

  • Page 211: Exploded Diagrams And Schematics

    APPENDIX REV.-A A.2 EXPLODED DIAGRAMS AND SCHEMATICS The exploded and schematic diagrams shown in Figures A-23 to A-38 are provided as additional reference. Figure A-23. SANPS Board Component Layout A-17 LQ-510...
  • Page 212 .’ CN 1...
  • Page 213 REV.-A APPENDIX Figure A-25. SANPSE Board Component Layout LQ-510 A-19...
  • Page 214 APPENDIX REV.-A Figure A-26. SANPSE Board Circuit Diagram A-20 LQ-510...
  • Page 215 REV.-A APPENDIX Figure A-27. SANPNL-W Board Circuit Diagram LQ-510 A-21...
  • Page 216 1/2LSl39 BOARD TOM4 Y 4 5 4 2 0 9 0 0 0 0 0...
  • Page 217 APPENDIX REV.-A LISLL/9SZII Il,ls I (WWM) d69SZS911H Figure A-29. SAMA Board Component Layout A-23 LQ-510...
  • Page 218 APPENDIX REV.-A S A M A B o a r d \‘I/ Y567201000 (ADJUST LEYERXRELEAY LEVER) Y567201100(Japan) Figure A-30. SAMA Board Circuit Diagram LQ-510 A-25...
  • Page 219 Table A-16. CN8 Connector Table A-19. CN11 Connector Table A-11. CN3 Connector (Cont.) Table A-10. CN2 Connector Pin No. Signal I/O Pin No. Signal Function Function Signal In No. Function Address Bit 13 +24 V + 24 VDC Error Signal Address Bit 2 +24 V + 24 VDC...
  • Page 220 ‘i .
  • Page 221 REV.-A APPENDIX Figure 14.32. Model 5710 Printer Mechanism Exploded Diagram A-29...
  • Page 222 REV.A APPENDIX Figure A-33. C80006 Pull Tractor Exploded Diagram LQ-510 A-30...
  • Page 224 APPENDIX REV.- Figure A-35. LQ-510 Printer Cover A Case Outline Drawing A-32 LQ-510...
  • Page 225 REV.-A APPENDIX ‘/ Figure A-36. LQ-510 Printer Cover B Case Outline Drawing A-33 LQ-510...
  • Page 226 APPENDIX REV.-A Table A-22. Part No. Reference Table (Refer to the exploded diagrams in Figures A-31 through A-34.) Ref. No. Description Description Ref. No. Description Ref. No LQ-510 RETAINING RING E (2. 3) SPROCKET LOCK LEVER PLATEN GAP SENSOR SPROCKET ASSEMBLY LOWER CASE ASSEMBLY FRICTION/TRACTOR SENSOR (RIGHT)

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