Page 1 L Q - 2 5 5 0 TECHNICAL MANUAL EPSON...
Page 2 THE POWER SUPPLY CABLE MUST BE CONNECTED, USE EXTREME CAUTION IN WORKING ON POWER SUPPLY AND OTHER ELECTRONIC COMPONENTS. WARNING REPAIRS ON EPSON PRODUCT SHOULD BE PERFORMED ONLY BY AN EPSON CERTIFIED REPAIR TECHNICIAN. MAKE CERTAIN THAT THE SOURCE VOLTAGE IS THE SAME AS THE RATED VOLTAGE, LISTED ON THE SERIAL NUMBER/RATING PLATE.
Page 3 Chapter 4 - Includes a step-by-step guide for product disassembly, assembly, and adjustment. Chapter 5 - Provides Epson-approved techniques for troubleshooting. Chapter 6 - Describes preventive maintenance techniques and lists lubricants and adhesives required to service the equipment. “ The contents of this manual are subject to change without notice.
Page 4 REV.-A REVISION TABLE f’! . REVISION DATE ISSUED CHANGE DOCUMENT March 31, 1988 1st issue t ,:, .% : . , . : , ~ D Š ˆ , . , .,...
Page 5: Table Of Contents
REV.-A TABLE OF CONTENTS CHAPTER 1. GENERAL DESCRIPTION CHAPTER 2. OPERATING PRINCIPLES OPTIONAL EQUIPMENTS CHAPTER 3. DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT CHAPTER 4. CHAPTER 5. TROUBLESHOOTING MAINTENANCE CHAPTER 6. APPENDIX – vi -...
Page 6: Rev.-A
REV.-A CHAPTER 1 GENERAL DESCRIPTION FEATURES ....................1-1 SPECIFICATIONS .
Page 7 REV.-A LIST OF FIGURES Exterior Views of the LQ-2550 ........1-1 Figure 1-1.
Page 8 REV.-A Table 1-11. Character Matrix and Character Size ......1-13 Table 1-12. 8-bit Parallel l/F Connector Pin Assignments .
Page 9: Features
Push and (optional) pull tractor feeding , Printing of fanfold paper without removal of the cut sheet feeder (option) Optional interface for the EPSON 8100 series Optional low-priced, double-bin cut sheet feeder with envelope feeding capability Figure 1-1 shows exterior views of the printer, Table 1-1 lists optional units that are available, and Table 1-2 lists the optional interface boards (refer to Chapter 3 for more detailed information) for the LQ-2550.
Page 10: Table 1-1. Optional Units
Table 1-1. Optional Units Name #73 14 Pull tractor unit # 7 3 4 3 Double bin cut sheet feeder # 7 3 9 4 Scanner option kit # 7 7 6 2 Ribbon cartridge (black) # 7 7 6 3 Ribbon cattridge (color) # 7 7 6 4 Ribbon cartridge (film-black)
Page 11: Specifications
REV.-A 1.2 SPECIFICATIONS The LQ-2550 communicates with a wide variety of host computers, with the aid of the optional Identity Modules. However, this section describes the specifications for the printer without the Identity Module. Specifications not affected by firmware (hardware specifications) are the same whether or not the Identity Module is installed.
Page 12: Line Feed Speeds
REV.-A Friction feed Feeding Method Tractor feed (push: standard, push-pull: optional) NOTES: 1. When using friction feed: Select friction feed on the control panel. Do not use continuous (fanfold) paper. Do not use a single sheet paper shorter than 92mm or longer than 364mm Do not perform any reverse paper feed operations within the top 8.5 mm and bottom 22 mm of the paper.
Page 13: Table 14. Cut Sheet Paper Specified Conditions
REV.-A \ Paper Specifications Refer to Table 1-4 and Figure 1-3. Cut sheet paper Specified Conditions Table 1-4. Cut Sheet Paper 182 -364 (7.2 - 14.3”) [mm] Width 364 (14.3”) max. Length [mm] I 0.065-0.10 (0.0025 - 0.004”) Thickness [mm] Weight [ l b ] I 14-22 ( 5 2 - 8 2 g/m2) I Plain paper...
Page 14: Figure 1-4. Fanfold Paper Printable Area
REV.-A .“3 Refer to Table 1-5 and Figure 1-4. Fanfold paper f ~ ,,..Table 1-5. Fanfold Paper Specified Conditions 101 -406 (4.0 - 16.0”) [ m m ] Width 6 (1 original + 5 ) over the entire temperature range [sheets] Copies Plain paper...
Page 15: Figure 1-5. Label Printable Area
REV.-A Envelopes No. 6 165 x 92 mm (6.5 x 3.63”) Size No. 10241 x 105mm (9.5 x 4. 13“) Bond paper, xerographic copier paper, airmail paper Quality Thickness 0.16-0.52 mm (0.0063 -0.01 97”) NOTE: Differences in thickness within printing area must be less than 0.25 mm (0.0098”). 1 2 - 24 lb (45 - 9 1 g/m2) Weight printing is only available at normal temperature.
Page 16: Table 1-6. Ribbon Cartridge Specification
REV.-A See Table 1-6. Ribbon Cartridge Table 1-6. Ribbon Cartridge Specification # 7 7 6 4 # 7 7 6 3 # 7 7 6 2 Ribbon Model No. Film Multi-color Normal Type Black, Cyan, Color Black Magenta, and yellow Black: Cyan: [million/characters]*’...
Page 17: Table 1-9. Environmental Conditions
REV.-A Refer to Table 1-9. Environmental Conditions Table 1-9. Environmental Conditions Storage Operating 5 - 3 5 – 3 0 - 6 5 * Temperature [“C] 5 - 8 5 1 0 - 8 0 Humidity [% RH] Resistance to shock [G] 1 (within 1 ms) Resistance to Vibration [G] 0.25...
Page 18: Firmware Specifications
REV.-A f’ - , : 1.2.2 Firmware Specifications ESC/P-83 Expanded Control Code Bidirectional logic seeking Printing Direction 8K-bytes Input Data Buffer 8 bits Character Code 96 ASCII and 13 international character sets Character Set No. O Roman: Family SansSerif: No. 1 No.
Page 19: Table 1-10. Printing Mode
REV.-A Table 1-10. Printing Mode Printing Speed Double Printable Print Character [CPS] Condensed Emphasized Width Pitch ICPI] Columns Pitch Draft 17.1 Ignored ‘proportional — Max. 116 Min. 272 Max. 58 Min. 136 17.1 Max. 233 Min. 544 — Max. 116 Min.
Page 20: Figure 1-6. Character Matrix
REV.-A . . . See Figure 1-6. character Matrix (Superscript Character) Pin Nos. 17 to 24 are not used for superscript printing. (Normal Character) Ascender Area — Ascender Area (15pi!Ch) . . . (a 2 — Descender Area (Subscript Character) Face Wid!h(al) Pin Nos.
Page 21: Table 1-11. Character Matrix And Character Size
REV.-A See Table 1-11. Character Size Table 1-11. Character Matrix and Character Size Character Size Unit Matrix Face Printing Mode H. x V. [mm] DRAFT, 10 pitch DRAFT, 12 pitch DRAFT, 15 pitch . . . DRAFT, 10 pitch, condensed ‘...
Page 22: Interface Overview
REV.-A 1.3 INTERFACE OVERVIEW The LQ-2550 has both an 8-bit Parallel interface and an RS-232C serial interface as standard. The interface can be selected from the control Panel (For details of the control Panel settings, refer to Section 1.8.6.2.). 1.3.1 8-bit Parallel Interface Specifications Data Transmission Mode 8-bit parallel...
Page 23: Table 1-12. 8-Bit Parallel L/F Connector
Table 1-12. 8-bit Parallel l/F Connector Pin Assignments Description Return I 1/0 I Signal Pin No.1 Strobe pulse to read the input data. Pulse width must be STROBE more than 0.5 KS. Input data is latched after falling edge of this signal.
Page 24: Table 1-13. Select/Deselect Control
REV.-A > (’. Table 1-13. Select/Deselect Control ON-LINE ACKNLG DATA ENTRY ERROR BUSY SLCT-IN Dcl/Dc3 Disable DC l/DC3 HIGH pulse HIGH/LOW OFF-LINE Pulse output after Enable LOW/HIGH (During HIGH ON-LINE HIGH DC 1 (Normal Process) entry) data entry) Pulse output after Enable (Waits DC 1.
Page 25: Rs-232C Serial Interface Specifications
REV.-A 1.3.2 RS-232C Serial Interface Specifications Data Transmission RS-232C serial Mode Asynchronous Synchronization By DTR (REV) signal or X-ON/OFF protocol Handshaking Refer to Table 1-14 and Figure 1-9. Table 1-14. Serial Interface Handshaking Description X-ON/OFF protocol DTR Signal When the number of bytes remaining in the input X-OFF (DC3\l 3H) MARK buffer reaches 256 or less, the signal level goes to...
Page 26: Figure 1-10. Serial Data Transmission Timing
REV.-A . . . ~ 1-10. See Figure Data Transmission Timing “ ,’ ------ --------------------- -- -- -- -- -- -- -- -- ( -v) ( +V) —-:s!Mik16k [ -v) stop Data Bit s;t&* Pcr:;y Handshake ( +V) – “ ‘IIM!l!m ,,—...
Page 27: Table 1-15. Rs-232C Serial Interface Connector
Table 1-15. RS-232C Serial Interface Connector Pin Assignments Description Pin No. Signal Transmit data. Indicates when printer is ready to receive data. “MARK” level indicates printer is not ready to receive data. REV(=2nd RTS) Same as DTR. Receive data. SIGNAL GND —...
Page 28: Self-Test Operation
REV.-A -’% SELF-TEST OPERATION The LQ-2550 has the following self-test functions. The current and default settings at the control ‘“ printer panel are printed when the self-test is executed. When the C-SF mode is enabIed, the current sheet length printed out at the end of the first page. Table 1-16 lists the self-test operating instructions and Figure 1-12 shows the self-test printing.
Page 29: Hexadecimal Dump Function
REV.-A ., 1.5 HEXADECIMAL DUMP FUNCTION In hexadecimal dump mode, the printer prints out the data it receives in hexadecimal format. The printer prints a column of 16 hexadecimal values, followed by a column containing the 16 corresponding ASCII characters. If there is no corresponding printable character for a value (e.g., a control code, such as a carriage return or line feed), a period (.) is printed in the ASCII column in the position of the code.
Page 30: Printer Initialization
REV.-A 1.6 PRINTER INITIALIZATION initialization and software initialization. There are two initialization methods: hardware 1.6.1 Hardware Initialization This type of initialization occurs when printer power is turned on or when the printer receives the I NIT host via the 8-bjt Parallel interface. When the winter is initialized in this wwt it Performs signal from the the following actions: Initializes the printer mechanism...
Page 31: Error Conditions And Buzzer Operation
REV.-A ‘ 1.7 ERROR CONDITIONS AND BUZZER OPERATION This section describes the error conditions and buzzer operation of the printer. 1.7.1 Error Conditions If any of the following errors occur, the printer automatically enters the OFF LINE mode and outputs the appropriate interface signal.
Page 32: Main Components
REV.-A 1.8 MAIN COMPONENTS The LQ-2550 printer includes the following major subassemblies: Model-5560 printer mechanism ROMA board (main board) ROPS/ROPSE board (power supply board, 100- 120V and 220- 240V versions) Fan Unit Housing ROPNL-W board (control panel) Figure 1-14 shows the LQ-2550 component locations.
Page 33: Printer Mechanism
REV.-A 1.8.1 Printer Mechanism This section describes over view of the printer mechanism, and paper handling and operations. 1.8.1.1 Overview To improve paper handling, the following functions are newly incorporated in this 24-pin printer in addition to the conventional ones. Automatic release mechanism Automatic paper thickness detection nechanism Automatic platen gap adjustment mechanism...
Page 34: Paper Handling And Operations
REV.-A f “:; 1.8.1.2 Paper Handling and Operations Paper Loading and Ejection Since the paper release lever is controlled automatically, the pApER SELECT and LOAD/EJECT switches on the control panel provide highly improved paper handling. That is, change over between fanfold (continuous) and single sheet paper and loading/ejecting paper are performed automatically.
Page 35: Roma Board (Main Board)
REV.-A 1.8.2 ROMA Board (Main Board) ‘1 Figure 1-16 shows the ROMA board, which contains an HD64 180R1 P6 (main) CPU andaPPD7810HG (sub) CPU to control the operation of the printer. Driver circuits for the motors, solenoids, printhead, and sensors are also included on this board. The main ICS on the ROMA board are: 8-bit one-chip CPU (main control) HD64180R1 P6 (1 3A) .
Page 36: Rops/Ropse Board
REV.-A . . . 1.8.3 ROPS\ROPSE Board (Power Supply Circuit Board) f ~ ~ • The power supply circuit board is one of two boards, the ROPS for 100- 120 V operation or the “-” ROPSE for 220- 240 V operation. The basic construction of the two boards are the same: each board contains a fuse, line filter, and switching regulator circuit.
Page 37: Fan Unit
REV.-A U n i t ) 1.8.4 Fan A fan unit is used to lower the internal temperature of the printer. It removes heat within the printer housing that is generated by the electric circuits. Figure 1-18. Fan Unit 1.8.5 Housing The housing consists of the upper and lower cases and accommodates the control panel, printer mechanism, control circuit board, power circuit, and fan unit.
Page 38: Control Panel
REV.-A 1.8.6 Control Panel This section describes the control panel functions. 1.8.6.1 Hardware Specification On the control Panel, there are twelve non-locking switches, sixteen LEDs, and a 20-column LCD (Liquid Crystal Display) as shown in Figure 1-20. The functions of the switches and indicators are given immediately below the illustration.
Page 39 REV.-A FONT Switch Pressing this switch selects a font, and holding the switch for more than 1.0 second cycles through the fonts sequentially. The LCD displays the currently selected font. PITCH Switch Pressing this switch selects the character pitch, and holding the switch for more than 1.0 second cycles through the character pitches sequentially.
Page 40: Seiectype Function
REV.-A Other LEDs POWER LED (Green) Lights when power is ON. when the printer can receive data. READY LED (Green) Lights PAPER OUT LED (Red) Lights when the paper is at the end. micro adjustment, and platen gap D a A V LED (Yellow) Lights the setting for the SelecType, tear-off, adjustment functions.
Page 41: Operating Principles
REV.-A CHAPTER 2 OPERATING PRINCIPLES 2.1 General ....................2-1 2.1.1 Connector Descriptions .
Page 42 REV.-A ‘-’, 2.3.3.2 Switch Status Read Section ......2-57 2.3.3.3 LCD Control/Drive Section ....... 2-58 2.3.4 State Detection and Sensor Signal Input Circuits .
Page 43 REV.-A Printing Mechanism ............. 2-5 Figure 2-3.
Page 44 REV.-A INIT Reset Timing ............. . . 2 -45 Figure 2-39.
Page 45 REV.-A Motor Control/Drive Circuit ........2-80 Figure 2-75. HF Figure 2-76.
Page 46 REV.-A PG Motor Specifications ........... 2-10 Table 2-7.
Page 47 REV.-A Table 2-43. PG Gear Flag an PA1 Voltage ........2-69 HP Sensor Flag and PAO Voltage .
Page 48 REV.-A 2.1 GENERAL This chapter will describe features and operations of the Model-5560 printer mechanism, ROPS/ROPSE power circuit board, ROMA control circuit board and control panel. In this chapter, the following abbreviations are used: Carriage CS: Color select PE: Paper end PF: Paper feed PG: Platen gap PT: Paper thickness...
Page 49 REV.-A !.,. % 2.1.1 Connector Descriptions Figure 2-1 shows the connection between the ROMA board and other units. Table 2-1 gives general ““”” descriptions of the connectors. #8C0 ‘ F ANuNITk CARRIAGE HOME POSITION ..SENSOR PAPER THICKNESS SOLENOID.
Page 50 Table 2-1. Connector Descriptions Pin number Descriptions Boards Connectors Connection CN 1 l/F (8-bit parallel) ROMA Host computer #8 IXX l/F board l/F (option) — Host computer l/F (RS-232C serial) Identity/font module SLOT A Font module SLOT B Not used l–...
Page 51 REV.-A 2.1.2 Printer Mechanism Operations The Model-5560 is a serial printer mechanism equipped with a 24-pin impact dot printhead. This “““ mechanism has various new features to reduce manual paper handling. A block diagram is shown in Figure 2-2. + 3 5 Printing Mechanism @Printhead Driver Circuit...
Page 52 REV.-A 2.1.2.1 Printing Mechanism The printing mechanism consists of two parts: The printing mechanism composed of the printhead, ink ribbon and platen, and the printhead cooling mechanism composed of the printhead fan. Printing Mechanism Figure 2-3 shows the printing mechanism. lines (12 wires for each line).
Page 53 Table 2-2. Printhead Specifications Description Remarks Item Refer to Figure 1-2. Impact dot Type 0.2 mm Pin Diameter 12 line X 2 col. Pin Configuration 1/1 80” Dot Pitch Drive Voltage 35 VDC 8.6 ohms * 10% 25”C, for one coil Coil Resistance Drive Frequency 2.00 KHz (Max.)
Page 54 REV.-A Printhead Cooling Mechanism Figure 2-4 shows the printhead cooling mechanism. The printhead has a built-in thermistor to protect the dot wire drive coils from the high printhead temperatures (which can occur after many hours of continuous printing) which may burn or degrade them.
Page 55 REV.-A ~--:h 2.1.2.2 Platen Gap Adjustment Mechanism 1--, : This mechanism sets the platen-printhead gap according to the paper thickness. Figure 2-5 shows the platen gap adjustment sequence. NOTE: Also, the gap can be ajusted by control panel operation (Refer to section 1.8.6. 1.). Printhead Drive Platen Gap Paper Thickness...
Page 56 REV.-A Figure 2-7 shows the operation of the paper thichness detection mechanism. When paper is not loaded, point A of the PT sensor lever pushes the platen using shaft B as a fulcrum. At this time, point C of the PT sensor lever places pressure on the TCR (Touch Control Sensor) in the PT sensor to indicate the thickness.
Page 57 REV.-A Platen Gap Adjustment Mechanism ‘% f“ Figure 2-8 shows the platen gap adjustment mectlanism and Table 2-6 lists its specifications. The . “ rotation of the PG motor is transmitted to the pG gear via the PG reduction gear. The position of the PG gear is detected by the PG HP sensor (Refer to Figure 2-8(a).).
Page 58 REV.-A 2.1.2.3 Carriage Mechanism This mechanism consists of the carriage movement mechanism, ribbon feed mechanism and color select mechanism. Carriage Movement Mechanism Figure 2-9 shows the carriage movement mechanism and Table 2-9 lists its specifications. The printhead is mounted on the carriage, and the entire unit is supported by the two carriage guide shafts. The carriage is fixed to the timing belt on one side and is moved when the CR motor drives the timing belt.
Page 59 Table 2-9. Carriage Movement Mechanism Specifications Carriage Per Driving Method Sensor Motor Step Movement Timing belt 1/1 20’’/step CR HP sensor PW sensor CR motor; (MIN.) Refer to Table 2-10. Refer to Refer to Table 2-11. Table 2-12. Table 2-10. CR Motor Specifications Description Item Remarks...
Page 60 REV.-A Ribbon Feed Mechanism The ribbon feed mechanism consists of the ribbon feed mechanism and ribbon cartridge. Figure 2-11 shows the ribbon feed mechanism. —.. Ribbon Ureakmg : Spring I n k e d R i b b o n - Ribbon Ribbon Drive Gear...
Page 61 REV.-A / :;,, Color Select Mechanism Specifications i . . . operates to allow If the color ribbon cartridge is mounted on the carriage, the color select mechanism seven-color printing. Table 2-14 shows the specifications of the color select mechanism. Table 2-14.
Page 62 REV.-A 1. Outline selected The color-inked ribbon is divided into four strips as shown in Figure 2-12. One strip can be by vertically moving the color ribbon cartridge using point A of the carriage as a fulcrum. Color Ribbon Cartridge [Selected Color] 6.075 .
Page 63: Optional Equipments
c . , . , , \ , - REV.-A 2.1.2.4 Paper Feed Mechanism ,*’ This mechanism consists of the pF motor, paper feed mechanism, paper release mechanism and paper loading lever open/close mechanism. Paper feed mechanism The PF motor drives the platen or tractor via the PF transmission gear, and feeds the paper. If the paper runs out, the PE sensor detects it (Refer to Figures 2-14 and 2-1 5.).
Page 64 REV.-A 1. Push Tractor Feeding Paper is fed by driving the PF motor with the paper release lever set forward to load fan-fold paper into the push tractor unit. Paper Releae Lever r (close) Gear View (i) Side (ii) Top View (a) Gear Arrangement Push Tractor Paper Tension Roller...
Page 65 REV.-A 2. Friction Feeding The paper is loaded from the upper paper entrance with the paper release lever set backward. The paper is held against the platen by the paper feed roller and is fed due to friction by the platen and paper feed roller.
Page 66 REV.-A Paper Release Mechanism automatically switched The paper release mechanism operates so that the paper feeding method is between friction feeding and push tractor feeding. Table 2-21 lists the specifications of the paper release mechanism. Table 2-21. Paper Release Mechanism Specifications Driving Method Trigger Sensor...
Page 67 REV.-A .,~, Figure 2-16 shows the basic operations of the paper release mechanism, and Table 2-24 lists the switch f ~ ~ Š ˆ . .- timina for the paper feeding method. Switching is described below. Table 2-24. Paper Feeding Method Switch Timing (d) Friction + Tractor +a) Paper Release (c) Friction...
Page 68 REV.-A paDer Release Lever planetary Gear B RL Sensor (close) gear) transmission with tractor -1,+, *-+-J “~:, (a) Tractor (b) Tractor + Friction (d) Friction + Tractor ~ C.w. * C.c.w. (c) Friction 2-16. Paper Release Mechanism Operations Figure 2-21...
Page 69 REV.-A Paper Loading Lever Open/Close Mechanism This mechanism advances the paper through the paper holding roller during loading or unloading. Table 2-25 lists the specifications of the paper loading lever open/close mechanism. Table 2-25. Paper Loading Lever Open/Close Mechanism Specifications Trigger Motor Driving Method...
Page 70 REV.-A Switching operations are described below. Table 2-28. Paper Loading Lever Open/Close Timing Paper Loading (c) Open (d) Open + Close (b) Close+ Open (a) Close Lever State Solenoid C.w. Hold Motor C.c. w. Close Sensor Open Switching from Close to Open When the LD solenoid is energized, the LD trigger is pulled and the clockwise rotation of the paper feed motor is transmitted as follows: PF motor + PF transmission gear + Platen gear + LD planetary gear -+ LD gear A + Paper loading...
Page 71 REV.-A Paper Loading Lever LD Sen (open) Top View .— Shaft (ii) Side View Spring (a) Close (d) Open ~ Close (b) Close + Open ‘“ = LD Sensor (close) C.w. Ilml C.c.w. (c) Open Figure 2-17. Paper Loading Lever Open/Close Mechanism Operation 2-24...
Page 72 REV.-A 2.2 POWER SUPPLY CIRCUIT OPERATION (ROPS/ROPsE Board) The DC power supplies required by the control circuits and mechanisms in this printer are included on the power supply board. Table 2-29 shows the input ratings for this board. Table 2-29. ROPS/ROPSE Board Ratings Fuse F1 Rating Input Voltage [VAC] Name...
Page 73 REV.-A ““3 Figure 2-18 shows a block diagram of the power supply circuit. External noise on the AC input line is first attenuated by the input filter circuit. Then the input AC is -““ rectified by the full-wave rectifier circuit and smoothed by the smoothing circuit. Surge current that flows when the printer power is first turned on is suppressed by the surge- suppression circuit.
Page 74 REV.-A 2.2.2 Input Filter Circuit Figure 2-19 shows the input filter circuit. The input filter circuit attenuates external harmonics (noise) on the AC input line, and inhibits noise generated by the circuits in the printer from going out over the AC line.
Page 75 REV.-A SURGE CURRENT$ INPUT VOLTAGE Figure 2-21. Surge Current After the power is turned on, as the voltage across C 12 rises, the current is stabilized. Therefore, after the power switch is turned on, resistor R9 is inserted in series between smoothing capacitor C 12 and the input line to limit the surge current until the voltage across C 12 is stabilized.
Page 76 REV.-A The starting sequence is described below. When the printer power is turned on, DC input voltage V is input to this circuit. Drive current Is flows to the base of switching transistor Q1 via starting resistor R4, and Q1 turns At the same time as step 2, V 1 applied to coil T1 at the primary side of pulse transformer...
Page 77 REV.-A .:>, The waveforms at various points are shown below, Voltage Vm across T 110-8 ‘ T T1 7-6 Voltage across - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - —...
Page 78 REV.-A 2.2.5 +5 V and +12 V Supply Circuit Figure 2-24 shows the +5 V and + 12 V supply circuit. ~: “ ‘ +12V -1 2V 4- — – – – — 11 >’*: — — — — — J Figure 2-24.
Page 79 REV.-A ‘k V Current Limiting and Voltage Regulator Circuits 2.2.5.1 +5 The + 5 V current limiting and voltage regulation is performed by controlling the ON/OFF time of -. switching transistor Q 1. Current Limiting Figure 2-25 shows the + 5 V current limiting circuit. a comparator (IC 1 ).
Page 80 REV.-A Voltage Regulation Figure 2-26 shows the + 5 V voltage regulator circuit. The voltage is regulated by shunt regulatorL5431 (Q4). r-----J > —— w-w’ ( Pc 1 2-26. +5 V Voltage Regulator Circuit Figure Q4 keeps the cathode at + 5 V using the 2.5 V reference voltage from the gate terminal, which is set by voltage dividing resistors R 13 and R 15.
Page 81 REV.-A . ;,&, 2.2.6 Main Switching Circuit 2 (+35 V Supply Circuit) Figure 2-27 shows main switching circuit 2. the + 5 V line is turned on. The +35 V supPly circuit is controlled Main switching circuit turns on after mainly by regulator IC TL594 (IC2) at the secondary side.
Page 82 REV.-A Figure 2-28 shows the +35 V supply circuit. Current flowing in the direction shown by@ is applied to choke coil L4 and smoothing capacitors C31, C32, and C33, via D 10-1, and then output. If the output voltage from the secondary side reaches the limit of the current limiting or voltage regulator circuits in the latter stage of this circuit, transistors TR 1 and TR2 of IC2”...
Page 83 REV.-A 2 . 2 . 7 + 3 5 V C u r r e n t L i m i t i n g a n d V o l t a g e R e g u l a t o r C i r c u i t s { “...
Page 84 REV.-A waveform output from the oscillator, outputs, sawtooth relationships between the error amplifier in Figure 2-31. the dead-time control voltage are shown Sawtooth w a v e f o r m EAI and EA2 outputs High [+ > -) Deed time control voltage TR1andTR2baei i m (+<...
Page 85 REV.-A When the output voltage of the +35 V line rises and the relationship between VREF and V35E becomes ,,,, as shown below, the output of EA1 is changed from LOW H I G H . VREF s V35E (at this time, V035 z 35.3 [V]) When the output of EA 1 is HIGH, TR 1 and TR2 turn off, and Q3 in main switching circuit 2 turns off.
Page 86 REV.-A 2.2.8 Over V o l t a g e P r o t e c t i o n C i r c u i t As described in Section 2.2.7, the voltage from the +35 V line is monitored by the voltage regulator circuit, and fed back to main switching circuit 2 to keep the voltage constant.
Page 87 REV.-A (.., ‘3 2.3 CONTROL CIRCUIT BOARD (ROMA Board) Figure 2-33 shows a block diagram of the ROMA board. The ROMA board mainly consists of two 8-bit CPUS; one is the HD64 180R 1 P6 (1 3A) for the main control and the other is the pPD78 10HG (7B) for the sub control.
Page 88 REV.-A The main functions of the main CPU and its peripheral components are as follows: Interfacing with the host computer Processing and expanding the commands and data input from the computer via the interface Printhead control The main CPU controls the memory using a gate array (MMU: 14A). Figure 2-34 shows the IC address map for the main CPU.
Page 89 REV.-A R e s e t C i r c u i t 2.3.1 Figure 2-36 shows the reset circuit. After being input to the E05A 10AA gate array (NIMU: 14A), the reset signal resets the gate array, then is sent out to the other devices. Reset operation (hardware reset) is performed when: 1.
Page 90 REV.-A 2.3.1.1 (Drive System Pull-up) Voltage Supply Circuit Figure 2-37 shows the Vx voltage supply circuit. The Vx voltage is used to pull up the bus for the control signals transmitted to the power on reset on reset circuit, and drive circuits. It is also used to pull up the output of the buzzer drive IC (66). PT SOLENOID DRIVE CIRCUIT 4 .
Page 91 REV.-A Power ON/OFF 2.3.1.2 .,!, , Figure 2-36 shows the reset circuit and Figure 2-38 shows the waveform of this operation. When the power is switched on and Vx rises, voltage is applied to the integration circuit (composed C66, of R 120, D 14).
Page 92 REV.-A 2 . 3 . 1 . 3 INIT Signal Input from CN1 or CN2 Figures 2-36 shows the reset circuit and Figure 2-39 show the timing of the signals during this operation. When the INIT signal is input from outside (it should be low for 50 PS or more), it reduces the voltage at the CPU terminal via the integration circuit (R 115, C67, and D 13), the M546 10P (1 1 B), and IC (6 B).
Page 93 REV.-A 2.3.1.4 Font/lndentity Module Installation and Removal .- ,”’ Figure 2-36 shows the reset circuit and Figure 2-40 shows the module installed/removed reset timing. The font and indentity modules should not be installed or removed while the power is on. If this is done, the ROUT signal must be set low to prevent a ROMA board circuit malfunction.
Page 94 REV.-A 2.3.1.5 ST-RAM (1 OA) Battery Backup Circuit The ST-RAM (1 OA) employes a lithium battery (3.00 to 3.35 VDC) for backup, and is used to maintain the initial data for the printer mechanism and settings for the control panel when the printer power is turned off.
Page 95 REV.-A I n t e r f a c e 2.3.2 This printer has both an 8-bit parallel interface and an RS-232C serial interface. 2.3.2.1 8-Bit Parallel Interface Operating Principles Figure 2-42 shows the 8-bit parallel interface data transmission timing. Data is transferred between a host computer and the printer using the following sequence: fl(a) BUSY...
Page 96 REV.-A 8-bit Parallel Inteface Circuit Figure 2-43 shows the 8-bit parallel interface circuit. This circuit is controlled by the main CPU. Address mapping for the M546 10P ( 11 B) is performed by the main CPU via the MMU (14A). General purpose 8-bit parallel interface IC M546 10P ( 11 B) is employed to simplify the control required from the main CPU.
Page 97 ON-LINE Hardware reset is occured. DC 1 is sent. 8-bit data is input. Set default values. . PORTO = H “ . . . f i x e d — STROBE pulse is sent. PORT 1 = “ H . . . f i x e d S e t i n i t i a l vaiues.
Page 98 READ DATA INITIAL IZE “ From t’ 4 HOST DIN 1-8 VALID DATA “b Figure 2-45. 8-Bit Parallel Interface Timing Table 2-33. 8-Bit Parallel l/F Signals HOST IEADY/ERROR BUSY PRINTER Acknowledge: READY Disable Goes high, when ON-LINE STROBE pulse is sent from host.
Page 99 REV.-A 2.3.2.2 RS-232C Serial Interface Operating Principles The two handshaking methods are as follows: 1. Status flag . . . DTR (REV) signal The DTR signal is set to SPACE (+V) when the printer can accept data and is set to MARK (–V) when the printr is in an error state or when the empty area in the input buffer reaches 256 bytes or less.
Page 100 REV.-A Circuit Description Figure 2-48 shows the RS-232C serial interface circuit. Data transmitted from the host computer is converted from EIA (+3 to +27 V, –3 to –27 V) to ITL O V, + 5 V voltage levels by the RS-232C line driver 75189 (3A).
Page 101 REV.-A s e t Inltlal v a l u e s . EBUSY--L- (DTR-SPACE) Send X-ON (llH). n e data twrrer v a c a n t 8rea reach EBUSY= ( DTR-MARK ) . Send X-OFF ( 13H ). recoin I ze and Host stoD the data send.
Page 102 REV.-A 2.3.3 Control Panel Interface Circuit ‘, Figure 2-51 shows the control panel interface circuit. This circuit is mainly divided into the following three blocks: LED drive section Switch status read section LCD control/drive section Descriptions of the above sections will now be given. Refer to Figure A-55 for the detailed circuits on the ROPNL board.
Page 103 REV.-A 2.3.3.1 LED Drive Section Each LED is controlled and driven by port expander driver IC MSM59371, which includes a 16-bit shift register and LED drivers. Figure 2-52 shows the data transfer timing for the MSM59371, and Figure 2-53 shows a block diagram of the MSM5937 1.
Page 104 REV.-A 2.3.3.2 Switch Status Read Section The state of each switch is read periodically by the sub CPU through analog ports AN5 to AN7. When the state of a switch is found to be different from the previous value, the new value is transferred to the LED drive and LCD control/drive sections as data to rewrite the switch status.
Page 105 REV.-A Figure 2-55 shows the command/data write timing for the SED 1200. The sub CPU selects which type of information will be written, command or data, using address line AO (command: AO = O, data: AO = 1), then outputs 4-bit data on the data bus (DO to D3). The sub CPU enables the outputs of tri-state LS375 (96) by changing port PB4 from high to low, and writes the command/data into the SED 1200.
Page 106 c , : % REV.-A .-”, ID. to D,) of Chafacle< Code [HexadeOmdl Low,, 4 b,t 6 I 7 I I B I I ‘=’~.i I 1- I cr> AREA I Figure 2-56. SED1 200 Character Code Map r“ , . . , - . . , 2-60...
Page 107 REV.-A State Detection and Sensor Signal Input Circuits , 2.3.4 This section describes the state detection circuits on the ROMA board and sensor signal input circuit. Table 2-37 lists the state detection circuits onthe ROMA board. Table 2-38 lists the sensors connected to the ROMA board.
Page 108 REV.-A Sensors List Table 2-38. Sub CPU Signal Reference Type Description N a m e Position Reading Port Section Thermistor Detects the AN 1 2.3.4.4 Printhead ther- Printhead printhead mal sensor temperature 2.3.4.5 Photo Detects the PW sensor Printer mechanism reflector paper width Detects the pa-...
Page 109 REV.-A 2.3.4.1 Reference Voltage Supply Circuit Figure 2-57 shows the circuit that supplies reference voltage VDC) to VAREF (4.746 the A/D converter in the sub CPU. In this circuit, programmable shunt regulatorTL431 (9C) is used to output the reference voltage. \ R71 CPU(7B) VAREF...
Page 110 REV.-A ,,,,, 2.3.4.2 35 V Line Voltage Detection Circuit ,.. .,, the voltage on the line. The As shown in Figure 2-58, this circuit detects 35 V detected voltage is divided “ by R79 and R80, and the voltage at point @ is input to ANO terminal of the sub CPU.
Page 111 REV.-A Table 2-39. 35 V Line Voltage and ANO Voltage ANO Terminal Voltage [V] I 35 V Line Voltage [V] 3 . 8 9 3 . 3 9 30.53 xl: Lower limit 2.3.4.3 VR1/VR2 Reading Circuit Figure 2-60 shows the VR1/VR2 reading circuit. The values (voltages) set by VR1 and VR2 are used to control the corrections for bidirectional printing in the LQ and draft modes.
Page 112 REV.-A &!h 2.3.4.4 Printhead Temperature Detection Circuit Figure 2-61 shows the printhead temperature detection circuit. This circuit detects the temperature using a thermistor in the printhead. AREF R59 & PRINTHEAD AN1 4 ‘1’ (7 B) Figure 2-61. Printhead Temperature Detection Circuit /.
Page 113 REV.-A AN1 Voltage ~ T a b l e 2 - 4 1 . Printhead Temperature Upper/lower Limits and Temperature [“C] AN1 Terminal Voltage [V] 2.71 Upper limit 2 . 8 0 Lower limit 2.3.4.5 PW Sensor Circuit Figure 2-63 shows the PW sensor circuit. This sensor becomes active when the paper thickness exceeds 0.18 [mm] (a postcard or envelop).
Page 114 REV.-A -.t, 2.3.4.6. PT Sensor Circuit t ~ ~ • Figure 2-64 shows the PT sensor circuit. The TCS (Touch Control Sensor) in this circuit detects the paper “‘-”’ thickness according to the change in pressure applied by the PT solenoid, and the pressure is changed the voltage value.This circuit can detect paper thickness between O and 0.8 [mm].
Page 115 REV.-A 2.3.4.7 PG HP Sensor Circuit Figure 2-66 shows the PG HP sensor circuit. This circuit determines the platen gap home position of the PG motor. PG GEAR FLAG CN 16 –r– n _ _ , SU8 CPU 1 *; RI 8 (7 B) ‘...
Page 116 REV.-A 2.3.4.8 CR HP Sensor Circuit Figure 2-67 shows position of the the CR Hf’ sensor circuit. This circuit determines the home carriage. “’”” CARRIAGE FLAG CN13 - - - - - - - – - ~ - _ _ - - , SUB CPU (7 B) CM 1-5...
Page 117 REV.-A 2.3.4.9 PE Sensor Circuit Figure 2-68 shows the PE sensor circuit. This circuit determines whether paper exists in the printer or not. ~B7 SUB CPU (7 B) ‘f Figure 2-68. PE Sensor Circuit Table 2-45 shows the relationship between the paper state and the voltage at the PB7 terminal of the sub CPU.
Page 118 REV.-A ::.34 2.3.4.10 RL/LD Sensor Circuit Figure 2-69 shows the RIJLD sensor circuit. This circuit uses the AN6 and AN7 terminals of the sub -- CPU as signal inputs. A R E F RL Sensor CN20 0> RI 02 SUB CPU ( 7 B ) AN7 R106 (6B)
Page 119 REV.-A 2.3.4.11 Case Open Sensor Circuit Figure 2-70 shows the case open sensor circuit. This circuit employs an IC including a hall-effect element that can detect a magnetic field. i z %z Upper Case Magnet 5 CN21 Magnetic Field R104 H a l l - E f f e c t AN 1 CM2-5 ( 5 B )
Page 120 REV.-A 2.3.5 Printhead Control/Drive Circuit Figure 2-71 shows the printhead control/drive circuit block diagram. The main CPU (1 3A) transmits print data for one line in three steps (8-bit data x 3 24 dots) and stores the data in control gate array E05A02LA (2A).
Page 121 REV.-A 2.3.5.1 E05A02LA Gate Array (2A) Refer to Appendix A.1 .1.18 for the details of the E05A02 LA. The E05A02LA gate array is a 24-pin printhead data control IC, and includes the interface circuits used between the CPU and printhead driver. Because the gate array is mapped so that it corresponds to CPU memory addresses, the functions of the gate array can be accessed as memory-mapped 1/0.
Page 122 REV.-A [::: 2.3.5.2 Printhead Drive Circuit The printhead drive circuit converts the print signals output from the E05A02LA into printhead coil drive voltages. The major drive circuits are incorporated in hybrid IC STK66082E ( 1 A). Figure 2-72 shows the equivalent circuit. Refer to Appendix A.1.l.l 4 for the details of the STK66082E.
Page 123 REV.-A 5[V] - - - (7 B:pin 23) Approx. y;;ylj ‘v],---- 5[V] PNPON (7B: pin 24) rllln III u 35[V] - - - - - ( 1 ~ n ~ (1A) Approx. 250 [~ s] at 35 V, 25 ‘C, * 1 : in the Draft self test mode, when the paper thickness is normal...
Page 124: Table
REV.-A .- . . , , . , , . 2.3.5.3 Relationship Between Paper Thickness and Print Mode “ ,’ The sub [mm] using the PT sensor. Based on t, the sub CPU selects one CPU detects paper thickness t of three printhead drive pulses so that the correct print energy will be applied to the printhead coils.
Page 125 REV.-A 2.3.5.4 Relationship Between the First Printhead Drive Pulse Width and +35 V Line Voltage As described in Section 2.3.5.3, this printer has three kinds of pulse widths for the first drive pulse depending on the paper thickness. Figure 2-74 shows the relationship between the first printhead drive pulse width and +35 V line voltage.
Page 126 REV.-A .: . , . , HF Motor Control/Drive Circuit 2.3.6 Figure 2-75 shows the HF motor control/drive circuit, and Figure 2-76 shows the HF motor control/drive ‘ circuit signal timing. +35 CN9 161 HF MOTC 2 148(2c) COIL DRIVER ---------, ;’...
Page 127 REV.-A Control Circuit The control circuit consists of hybrid IC li8D2 148 (2 C). This IC is divided into four blocks. 1. HF Motor ON/OFF Circuit This circuit controls the ON/OFF switching of the HF motor using two inputs (ENB signal and HF motor thermistor resistance).
Page 128 REV.-A 2.3.7 CR and PF Motors Control/Drive Circuit Figure 2-77 shows the CR and PF motors controVdrive circuit block diagram. The CR and PF motors are controlled by the sub CPU (7 B). The stepper motor control gate array IC (M CU:4B) is memory-mapped into the address space of the sub CPU, allowing the stepper motor to be controlled by address selection (MMIO1 ).
Page 129 REV.-A 2.3.7.1 E05A09BA Gate Array (MCU: 4B) The MCU has two 4-phase stepper motor phase switching pulse generation circuits that can be controlled separately. Phase switching timing, motor forward rotation, reverse rotation, and holding, and the phase switching system are all controlled by the sub CPU. In addition to the above, the MCU can control three ports.
Page 130 REV.-A 2.3.7.2 CR Motor Control/Drive Circuit The circuits included in the CR motor control/drive circuit are as follows. TM1 Clock Generation Circuit Figure 2-78 shows the TM 1 clock generation circuit and Figure 2-79 shows the timing for the sub CPU output signal and TM 1 signal.
Page 131 REV.-A Reference Voltage Generation Circuit Figure 2-80 shows the reference voltage generation circuit and Table 2-53 shows the relationship between each POT terminal state of the MCU and carriage speed. This circuit changes the voltage applied to the RS terminal of the CR motor driver IC S17304 (7C) using the combination of R55, R56, R57, and R 123 so that the current limiting value for the current flowing to a coil of the CR motor varies.
Page 132 c- , . : > REV.-A CR Motor Drive Circuit Figure 2-81 shows the CR motor drive circuit. Figure 2-82 shows the CR motor drive circuit signal timing. This circuit employs unipolar stepper motor driver IC S17304 (7 C), and drives the CR motor using constant current chopper type control.
Page 133 REV.-A [ v ] (7C: pin AOUT (7C: pin (7C: ‘$n 0.5ms/Dl V In the Draft self test mode: Figure 2-82. CR Motor Drive Circuit Signal Timing 2-87...
Page 134 REV.-A The blocks are as follows. 1. Phase Drivers (A to D) These drivers are turned on and off upon receiving the drive pulses AO 1 to DO 1 from the MCU (4 B). When the input signal is HIGH, the corresponding phase driver turns on. 2.
Page 135 REV.-A CR Motor Phase Switching System The CR motor is a 4-phase stepper motor, and each phase is controlled by the corresponding terminal (AO1 to DO1) of the MCU (4 B). Two phase switching systems are used; 2-2 phase switching and 1-2 phase switching.
Page 136 Table 2-54. CR Motor Speed and Phase Switching System Driving Mode Holding Speed Phase Switching System Carriage Speed 2667 2 0 0 0 1333 4000 [PPS] — 5 0 0 7 5 0 1450 Cycle [jdstep] 120 (60) DPI [dot./inch] 3 6 0 (1 20,1 80) —...
Page 137 REV.-A Carriage Motion Area and Speed Control The carriage motion area is shown in Figure 2-84. This is mainly divided into three areas: 1 ) acceleration area, 2) printable area, and 3) deceleration area. The printer has five carriage speeds modes. Deceleration area Printable area 13.6- Acceleration area...
Page 138 . . . Speed Speed Speed Speed Speed High Speed Ski Printoble High Speed Skip COns!Onl Acceleration SCH. Speed Area Acea H i g h S p e e d S k i p C o n t r o l Range min.9CH. min.10CH.
Page 139 REV.-A 2.3.7.3 PF Motor Control/Drive Circuit The PF motor is driven only by the 2-2 phase switching system, and the minimum paper feeding amount s 1/360 inch. Table 2-55 shows the various PF motor control relationships. Table 2-55. Various PF Motor Control Relationships Acceleration/ Paper Feeding PF Motor Coil...
Page 140 REV.-A PF Motor Drive Circuit Figure 2-86 shows the PF motor drive circuit and Figure 2-87 shows the PF motor drive circuit signal -“ timing. This circuit employs unipolar stepper motor driver IC STK698 1 H (7D) and drives the PF motor using constant current chopper type control.
Page 141 REV.-A (7D’ pin 5) o A O U T (7D: pin 4) o (7D: ‘p?n 8 ) o NOTE: During form feeding. Figure 2-87. PF Motor Drive Circuit Signal Timing 2-95...
Page 142 REV.-A #’![..\ Each block in the PF motor drive circuit is described below. $,. : : 1. Phase Drivers (A to D) These drivers are turned on and off upon receiving the drive pulses A02 to D02 from the MCU (4 B). When the input signal is HIGH, the corresponding phase driver turns on.
Page 143 REV.-A PF Motor Phase Switching Timing The PF motor is a 4-phase stepper motor, and each phase is controlled by the corresponding terminal (A02 to D02) of the MCU (4 B). The 2-2 phase switching system is employed. Figure 2-88 shows the PF motor phase switching timing.
Page 144 REV.-A 2.3.8 PG and CS Motors Control/Drive Circuits Figure 2-89 shows a block diagram of the PG motor and CS motor drive circuits.The MCU (3B) is mapped into the sub CPU address space, and the PG and CS motors are controlled from the sub CPU by sending commands to the MCU (3 B).The reference clock required to generate phase switching pulses for the stepper motor drive is generated by the timer within the sub CPU, which generates the phase switching pulses for the PG and CS motor drive circuits by sending commands to the MCU.
Page 145 REV.-A 2.3.8.1 E05A09BA Gate Array (MCU: 3B) The E05A09BA gate array has the same functions as the MCU (4B) described in Section 2.3.7.1. This MCU (3B) is accessed when address MMI02 is selected by the sub CPU. Table 2-56 lists the address assignments for the MCU (3 B).
Page 146 REV.-A ~i;, 2.3.8.2 PG Motor Drive Circuit Figure 2-90 shows the PG motor drive circuit and Figure 2-90 shows the signal timing. The PG motor is driven using only 2-2 phase switching and regulated +35 VDC. Table 2-57 lists the relationships between various CS motor control factors.
Page 147 REV.-A PG Motor Phase Switching Timing The PG motor is a 4-phase stepper motor, and the phases are controlled by MCU(3B) terminals AO1 to DO 1. 2-2 phase switching is used for this motor. Figure 2-92 shows the PG motor phase switching timing.
Page 148 REV.-A 2.3.8.3 CS Motor Drive Circuit CS Motor Drive Circuit Figure 2-94 shows the CS motor drive circuit and Table 2-58 lists the related factors for CS motor control. The CS motor is driven using and regulated +35 VDC. only phase switching In this printer, the color ribbon can be switched at every 40 steps (Refer to Figure 2-1 3.) from the color home position, and the CS motor has an adjustable speed control.
Page 149 REV.-A CS Motor Phase Switching Timing The CS motor is a 4-phase stepper motor, and the phases are controlled by MCU(3B) terminals A02 to D02. 2-2 phase switching is used for controlling this motor. Figure 2-95 shows the CS motor phase switching timing.
Page 150 REV.-A #-’’:b, 2.3.9 PT/RL/LD Solenoid Drive Circuit g, ;, Figure 2-96 shows the PT/RL/LD solenoid drive circuit, Table 2-59 lists the related factors for PT/RL/LD solenoid control, and Figure 2-96 shows the PTsolenoid drive circuit pulse timing. CPU (7 B). Each solenoid drive circuit is turned on and off directly by the sub RL SOLENOID d SUB CPU...
Page 151 REV.-A 2.3.10 Buzzer Drive Circuit This printer uses a piezo-buzzer to confirm control panel switch input and indicate errors. Figure 2-98 shows the buzzer drive circuit and Figure 2-99 shows the its pulse timing. 3.3K F3zl 11 8 SUB CPU (7 B) Figure 2-98.
Page 152 REV.-A 2.3.11 Initialization Sequence Figure 2-100 shows the initial sequence from power-on to printing operation. POWER ON PG HP SEEK TRACTOR FRICTION WITH PAPER PAPER PWS (Platen V)=VS Platen surface voltage *)PW reference voltage set measurement ] (using the PW sensor). PAPER THICKNESS EIF I Paper end voltage -civolta,e...
Page 153 REV.-A WITH PAPER PAPER OUT PAPER THICKNESS PAPER THICKNESS EtF= E end voltage Paper voltage set *) Paper end measurement detected by the PT sensor) ::~:;W:OUS PAPER =’ s ’ ’ : ’ ’ n ’ e nsor) ai ; s ’ ’ : ’ ’ n ’ e nsor ) [ PAPER THICKNESS EZFI CR CENTERING 40COI.
Page 154 REV.-A CHAPTER 3 OPTIONAL EQUIPMENTS 3.1 GENERAL ..................... 3-1 3.2 OPTIONAL INTERFACES .
Page 155: Optional Interfaces
REV.-A 3.1 GENERAL for the LQ-2550. This chapter describes the options available 3.2 OPTIONAL INTERFACES The LQ-2550 uses the 8100 series optional interfaces. The main optional interfaces are listed in Table 3-1. Table 3-1. Optional Interfaces Description Cat. No. Buffer Size Function Standard #8 172...
Page 156 REV.-A ~-, ., 3.2.1 8143 Interface Board When the RS-232C and 20 mA neutral current IOOP are in use, the printer will also SUPPOrt the 8143 ‘-”’ new serial interface. Specifications Asynchronous Synchronization B P S 75 to 19,200 Bit rate Word length 1 bit Start bit...
Page 157 REV.-A DIP Switch Settings Table 3-3 shows the 8143 DIP switch settings, and Table 3-4 lists the bit rates selected by the DIP switch settings. When a standard 8-bit parallel interface is used instead of the 8143 VF board , DIP switch 1-8 should be turned off.
Page 158: Disassembly, Assembly, And Adjustment
REV.-A CHAPTER 4 DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT 4.1 GENERAL REPAIR INFORMATION ..........4 -1 4.2 DISASSEMBLY AND ASSEMBLY .
Page 159 REV.-A 4.2.5.15 Paper Release Solenoid Assembly Removal ..............4-28 4.2.5.16 Paper Loading Trigger Assembly Removal.
Page 160 REV.-A Figure 4-14. ROMA Board Removal ............4-10 Figure 4-15.
Page 161 REV.-A Figure 4-47. Paper Release Solenoid Assembly Removal ....4-28 Figure 4-48. Path of Sensor Lead Wires ..........4 -29 Figure 4-49.
Page 162 REV.-A Figure 4-77. Head Adjustment Lever Mounting Position Adjustment ................4-43 Figure 4-78.
Page 163: General Repair Information
REV.-A 4.1 GENERAL REPAIR INFORMATION This chapter describes the disassembly, assembly, and adjustment procedures for replacing any of the main components of the LQ-2550. Figure 4-1 shows the external view of the LQ-2550. Sheet Guide Guide idge Cover Knob Printer Cover Push Tractor Paper Supprot /Printhead...
Page 164 REV.-A DANGER . Prior to beginning the disassembly, assembly, and adjustment procedures, be sure to disconnect the AC power cord and the interface cable. Wear aloves to Protect your hands from being CUt. W A R N I N G B When disassembling and checking the printer, remove the protective materials inside of the printer.
Page 165 Dial gauge base #E 671 B7651 11801 Extension cable #E 649 B765 109801 Availability Class O: Commercially available tool A: Mandatory @: EPSON exclusive tool B: Recommended Table 4-2. Measuring Instruments Designation Specification Class Oscilloscope 20 MHz or more Multi meter...
Page 166 REV.-A [“ ‘+$ Small parts are described using the following abbreviations. Table 4-4. Abbreviations for Small Parts Part Name Abbreviation Cup Screw Cross-Bind-head screw Cross-Bind-head with Outside-toothed washer Cross-Bind-head B-tight Cross-Bind-head S-tight Cross-Bind-head S-tight with Outside-toothed washer CBS (0) Cross-Pan-head with Spring washer Cross-Pan-head S-tight with Outside-toothed washer CPS (o) Cross-Pan-head S-tight with Plain washer...
Page 167: Disassembly And Assembly
REV.-A 4.2 DISASSEMBLY AND ASSEMBLY This section describes the procedures for disassembling the main components of the LQ-2550 printer, with illustrations. The disassembled components are reassembled by simply performing the disassem- bly operation in reverse sequence. Assembly procedures, therefore, have been omitted. However, special notes for assembly are labeled “ASSEMBLY POINT.”...
Page 168: Printhead Removal
REV.-A ,., . -., . 4.2.1 Printhead R e m o v a l Step 1: Remove the two printer covers. Step 2: Remove the two screws CS(M3X 6) securing the printhead. Step 3: Disconnect the printhead connector by lifting the printhead, and remove the printhead. - p r i n t e r ~over Figure 4-5.
Page 169: Upper Case Removal
REV.-A 4.2.2 Upper Case Removal Pull out the paper feed knob. Step 1: Remove the two printer covers. (Refer to arrows @ through @.) Step 2: Remove the cartridge cover. Step 3: Remove the platen paper guide by turning it toward you. Step 4: Remove the three screws CBB(M4 X 12) securing the upper and lower cases.
Page 170: Push Tractor Unit Removal
REV.-A 4.2.3 Push Tractor Unit Removal The push tractor unit should be removed before removing the circuit boards and the printer mecha- nism from the lower case. Push Tractor Unit Removal 4.2.3.1 Remove the upper case. (Refer to Section 4.2.2.) Step 1: Remove the two screws CBS(M3 X 6) securing the push tractor unit to the printer mechanism.
Page 171: Push Tractor Unit Disassembly
REV.-A 4.2.3.2 Push Tractor Unit Disassembly This section describes the removal of the left tractor assembly. Remove the left shaft holder inward from the left tractor frame. Step 1: Remove the nut HNO(M4) and the screw CPS(M3 X 6) from the left side of tractor frame, then Step 2: remove the frame.
Page 172: Circuit Board Removal
REV.-A ,.,, 4.2.4 Circuit Board Removal .-, , The circuit boards control the printer mechanism, and consist of the ROMA control board and the ROPS/ROPSE power supply board. Removal of the control panel, the case open sensor, the battery, and the cooling fan are also described in this section.
Page 173 REV.-A ADJUSTMENT REQUIRED When the ROMA board is replaced, perform the following adjustment: Section 4.3.6 Bi-directional Printing Alignment (Page 4-47) When the connector CN7 for the battery is disconnected, perform the following adjustment: Section 4.3.5 Platen Gap Initial Value Write Operation (Page 4-46). 4.2.4.2 ROPS/ROPSE Power Supply Board Removal —.
Page 174: Control Panel Removal
REV.-A 4.2.4.3 Control Panel Removal “.- Step 1: Remove the upper case. (Refer to Section 4.2.2.) Step 2: Remove the two screws CBB(M4X 12) securing the control panel. Step 3: Disconnect the cable from the connector at the back of the control panel, which connects the control panel to the ROMA board.
Page 175: Battery Removal
REV.-A Battery Removal 4.2.4.5 Remove the upper case. (Refer to Section 4.2.2.) Step 1: Disconnect connector CN7 on the ROMA board. Step 2: Step 3: Insert a slotted screwdriver into the groove of the lower case, then unlock the tab of the battery case.
Page 176: Cooling Fan Removal
REV.-A - : , ; . , > , 4.2.4.6 Cooling Fan Removal Remove the upper case. (Refer to Section 4.2.2.) Step 1: Remove the push tractor unit. (Refer to Section 4.2.3. 1.) Step 2: Remove the ROMA board. (Refer to Section 4.2.4.1.) Step 3: Ramove the ROPS/ROPSE board.
Page 177: Printer Mechanism Disassembly
REV.-A 4.2.5 Printer Mechanism Disassembly the main components of the printer This section describes the procedures for disassembling during assembly. mechanism. Refer to Figures A-56 and A-57 in the appendix 4.2.5.1 Printer Mechanism Removal Step 1: Remove the upper case. (Refer to Section 4.2.2.) Step 2: Remove the push tractor unit.
Page 178: Color Select Unit Removal
REV.-A Color Select Unit Removal 4.2.5.2 Remove the front side of the printer cover. Step 1: 90 degrees to unlock the color Turn the lever on the color select unit counterclockwise Step 2: select unit. Remove the color select unit by lifting it straight up. Step 3: Lever Color...
Page 179: Cartridge Base Removal
REV.-A 4.2.5.3 Cartridge Base Removal Removal of the cartridge base is useful when removing the head cables, the head fan motor, and the paper width sensor. W A R N I N G When removing the cartridge base, be careful not to snap the tabs. Step 1: Remove the printer mechanism.
Page 180: Cable Removal
REV.-A 4.2.5.4 Cable Removal (Front Head Cable, Rear Head Cable, Color Select Cable) W A R N I N G When removing the cables from the two tabs of the carriage, be careful not to disconnect the cables.The three cables should be put together as shown in Figure 4-28 for assembly. .
Page 181: Paper Tension Assembly Removal
REV.-A 4.2.5.5 Paper Tension Assembly Removal W A R N I N G Confirm that the paper release lever is in the friction position (backward setting). When removing the two screws securing the paper tension assembly to the right and left frames, take care not to drop the plain washers PW(3-O.54.8) inserted between the paper tension assembly and both frames.
Page 182: Carriage Motor Removal
REV.-A 4.2.5.6 Carriage Motor Removal Step 1: Remove the printer mechanism. (Refer to Section 4.2.5.1.) Step 2: Remove the screw CBS(0)(4X12) securing the belt driven pulley mounting plate, then release the timing belt from the belt drive pulley at the rear of the carriage motor. Step 3: Remove the two screws CPS(M3X8) securing the carriage motor to the base frame.
Page 183: Paper Feed Motor Removal
REV.-A 4.2.5.7 Paper Feed Motor Removal W A R N I N G When removing the paper feed motor, the tractor transmission gear spring may fly out. Be careful not to lose it. Step 1: Remove the printer mechanism. (Refer to Section 4.2.5.1.) Step 2: Remove the two screws CPS(M3X8) securing the paper feed motor, and remove the motor.
Page 184: Platen Gap Motor Removal
REV.-A Platen Gap Motor Removal 4.2.5.8 Remove the printer mechanism. (Refer to Section 4.2.5. 1.) Step 1: Remove the two screws CPS(M3 X 8) securing the platen gap motor. Step 2: screw from being If the platen gap home position flag prevents the motor securing removed, manually rotate the platen gap reduction gear so that the screw can be removed.
Page 185: Head Fan Motor Removal
REV.-A 4.2.5.9 Head Fan Motor Removal W A R N I N G When shifting the ribbon drive assembly, be careful not to cause unnecessary stress at the point where the lead wires come out from the head fan motor. Step 1: Remove the printer mechanism.
Page 186: Platen Removal
REV.-A 4.2.5.10 Platen Removal 1 ..., Step 1: Remove the printer mechanism. (Refer to Section 4.2.5.1.) W A R N I N G Confirm that the paper release lever is in the friction position (backward setting). Step 2: Remove the paper tension assembly. (Refer to Section 4.2.5.5.) Step 3: Remove the paper feed motor.
Page 187: Carriage Home Position Sensor Removal
REV.-A 4.2.5.11 Carriage Home Position Sensor Removal Step 1: Remove the printer mechanism. (Refer to Section 4.2.5.1.) Separate the cable from the carriage home position sensor by disconnecting the connector. Step 2: NOTE: The carriage home position sensor and the home position sensor cable are supplied as separate after service parts.
Page 188: Platen Gap Home Position Sensor
REV.-A 4.2.5.13 Platen Gap Home Position Sensor Assembly Removal from the platen gap motor. ‘“ The platen gap home position sensor assembly includes the lead wires Step 1: Remove the printer mechanism. (Refer to Section 4.2.5. 1.) of the base frame. Disconnect the connector for the platen gap motor at the back Step 2: position sensor, then remove...
Page 189: Paper Width Sensor Removal
REV.-A 4.2.5.14 Paper Width Sensor Removal Step 1: Remove the printer mechanism. (Refer to Section 4.2.5. 1.) Step 2: Remove the printhead. (Refer to Section 4.2.1.) Step 3: Remove the cartridge base. (Refer to Section 4.2.5.3.) Step 4: Place the carriage over the cutout in the base frame, then disconnect the connector for the paper width sensor from the back of the base frame.
Page 190: Removal
REV.-A . :. ,, 4.2.5.15 Paper Release Solenoid Assembly Removal , , ..: .., -,. W A R N I N G When mounting the sensor, the stud should be fixed in the frame hole. Otherwise paper release mechanism will not function correctly. Step 1: Remove the printer mechanism.
Page 191 REV.-A ADJUSTMENT REQUIRED When the paper release solenoid assembly is removed, perform the following adjustment: Section 4.3.2 Paper Feed Motor Backlash Adjustment (Page 4-4 1) ASSEMBLY POINTS: The lead wires from the sensor should be drawn along the frame to the rear of the printer and hooked by the tabs on the loading frame.
Page 192: Paper Loading Trigger Assembly Removal
REV.-A ,.@:” ‘\ 4.2.5.16 Paper Loading Trigger Assembly Removal +:. .; The loading planetary gear is not included in the paper loading trigger assembly. W A R N I N G When mounting the sensor, the stud of the sensor should be fixed in the frame hole. Otherwise, the paper loading mechanism will not function correctly.
Page 193 REV.-A When setting the paper loading lever, observe the following sequence. @ Align the two marks on the loading gear A and the loading gear assembly. @ Set the paper loading lever so that the marks on the lever is in alignment with the mark on the loading gear A.
Page 194: Paper Thickness Sensor Assembly
REV.-A 4.2.5.17 Paper Thickness Sensor Assembly Removal =, :, Remove the printer mechanism. (Refer to Section 4.2.5. 1.) Step 1: Release the lead wires (except the carriage home position sensor wire) from the wire clamp Step 2: at the back of the base frame. Remove the three screws CPS(M3 X 8) securing the paper thickness sensor unit to the base Step 3: frame at the back of the base frame.
Page 195: Paper Guide Plate Removal
REV.-A 4.2.5.18 Paper Guide Plate Removal DANGER Because the paper guide plate is a thin metallic part, handle it carefully. Remove the printer mechanism. (Refer to Section 4.2.5.1.) Step 1: Place the printhead at the left (or right) end. Step 2: Step 3: Remove the three paper guide plate springs from the back of the base frame.
Page 196: Paper Holding Roller Assembly Removal
REV.-A {’b, 4.2.5.19 Paper Holding Roller Assembly Removal t ~ ~ • Remove the two paper holding lever springs from the right and left frames. Step 1: Remove the two E-rings RE(3) fixing the right and left paper holding levers to both frames. Step 2: Remove the left paper holding lever from the shaft.
Page 197: Left Frame Removal
REV.-A 4.2.5.20 Left Frame Removal This section describes the removal of the left frame from the printer mechanism. This is useful when removing the paper feed roller shaft and the paper thickness sensor assembly. Remove the paper holding roller assembly. (Refer to Section 4.2.5.1 9.) Step 1: Remove the Step 2:...
Page 198 REV.-A ADJUSTMENT REQUIRED {... When the left frame is removed, perform the following adjustments: Section 4.3.1 Timing Belt Tension Adjustment (Page 4-40) Section 4.3.2 Paper Feed Motor Backlash Adjustment (Page 4-41) Section 4.3.3 Parallelism Adjustment Between Carriage Guide Shaft B and Platen (Page 4-42) Section 4.3.6 Bi-directional Printing Alignment (Page 4-47) ASSEMBLY POINTS: Prior to installing the platen gap gear assembly, verify that the leaf spring is mounted as shown below.
Page 199: Paper Feed Roller Assembly Removal
REV.-A 4.2.5.21 Paper Feed Roller Assembly Removal Step 1: Remove the printer mechanism. (Refer to Section 4.2.5.1.) Step 2: Remove the four paper feed springs at the back of the base frame. Step 3: Remove the three screws CPS(M3X8) securing the paper thickness sensor assembly at the back of the printer.
Page 200: Timing Belt Removal
REV.-A ,s ‘:., 4.2.5.22 Timing Belt Removal & : “ Step 1: Remov~ the printer mechanism. (Refer to Section 4.2.5. 1.) Place the carriage over the cutout in the base frame. Step 2: Remove the screw CPS(M3 X 8) securing the timing belt fixing plate at the back of the base Step 3: frame, then remove the belt fixing plate.
Page 201: Adjustment
REV.-A 4.3. ADJUSTMENT This section describes the adjustment procedures required when reassembling the LQ-2550 printer. When disassembly or replacement is performed during maintenance or repairs of the parts described in this section, the following adjustments should be performed to ensure proper operation. The adjustment sequence is shown in Figure 4-71.
Page 202: Timing Belt Tension Adjustment
c , , . , . REV.-A 4.3.1 Timing Belt Tension Adjustment This adjustment is required when the timing belt is removed or loosened. Step 1: Remove the printer mechanism. (Refer to Section 4.2.5.1.) Step 2: Verify that the timing belt is correctly inserted into the bottom of the carriage. Step 3: Loosen the screw CBS(0)(M4X 12) on the belt driven pulley mounting plate.
Page 203: Paper Feed Motor Backlash Adjustment
REV.-A Feed Motor Backlash Adjustment 4.3.2. Paper This adjustment is required when either the paper feed motor is replaced or when its mounting position is shifted. Remove the printer mechanism. (Refer to Section 4.2.5.1.) Step 1: Loosen the two screws CPS(M3 X 8) securing the paper feed motor. Step 2: Manually rotate the paper feed motor, and adjust the backlash between the pinion and the Step 3:...
Page 204: Parallelism Adjustment Between Carriage Guide
REV.-A ‘c’ .. . , , 4.3.3 Parallelism Adjustment Between Carriage Guide Shaft B and Platen This adjustment is required when: Left frame is removed. Remove the printer mechanism. (Refer to Section 4.2.5.1.) Step 1: Remove the printhead. (Refer to Section 4.2. 1.) Step 2: Remove the CB screw (M2.5 X 5), then remove the paper width sensor from the ribbon mask.
Page 205 REV.-A Paper Width Sensor Printhead Ribbon Mask CB (M2 x 5) Figure 4-74. Paper Width Sensor and Ribbon Mask Holder Removal Platen Gap Home Position Sensor ~ TO farthest position. Platen Gap Reduction Gear .<: Platen Gap Gear Carriage Guide Shaft B Platen Motor Pinion.
Page 206: Platen Gap Home Position Sensor Mounting
REV.-A c: , ? + ..Gap Home Position Sensor Mounting Position Adjustment 4.3.4 Platen This adjustment is required when: . The platen gap home position sensor mounting position is shifted. The platen gap gear is replaced. The platen is replaced.
Page 207 REV.-A Platen Gap Home Position Sensor O TO farthest position. Platen Gap Reduction Gear platen Gap Gear Carriage Guide Shaft B Platen Gap Motor Pinion (a) Platen Gap Motor Gears Series Thickness Gauge 1 ,, ~ 1.2 [mm] rinthead Platan p: Wide ~ Gap: Narrow Carriage Guide ~haft B...
Page 208: Platen Gap Initial Value Write Operation
REV.-A 4.3.5 Platen Gap Initial Value Write Operation The platen gap initial value write operation is required when: Connector CN7 for the battery unit is disconnected. (The LCD displays “RAM CLEAR” with the power on.) The printer mechanism is removed or replaced. The platen is replaced.
Page 209: Bi-Directional Printing Alignment
REV.-A 4.3.6 Bi-directional Printing Alignment This alignment is required when: . The even-numbered lines and the odd-numbered lines are misaligned in the bi-directional printing mode. The printer mechanism is replaced. The ROMA board is replaced. The timing belt is loosened. The alignment procedure is as follows (see Figure 4-83.): Step 1: Remove the cartridge cover, and insert the adjustment cartridge in slot A (see Figure 4-82).
Page 210 REV.-A Adjust VR 1 using either a philips or standard screw driver, with a thin tip, so that VR 1 is set “; Step 12: to the target (Tar.) value. When VR 1 is turned clockwise, the alignment value increments, and ‘ when it is turned counterclockwise, the value decrements.
Page 211: Troubleshooting
REV.-A CHAPTER 5 TROUBLESHOOTING 5.1 GENERAL ....................5-1 5.1.1 Diagnostic Tools .
Page 212 REV.-A LIST OF TABLES Troubleshooting Tools ............5-2 Table 5-1.
Page 213 REV.-A 5.1 GENERAL can occur, troubleshooting is not easy to perform. Here is a simple Because various types of problems procedure provided to perform troubleshooting. START Fault checking with Unit Replacement the diagnostic tool. I {Fault is corrected> Figure 5-1. Troubleshooting Procedure Table 5-1 lists the troubleshooting tools contained in the printer.
Page 214 REV.-A Table 5-1. Troubleshooting Tools Description Part No. Item Tool No. B7651 10101 Use with EPSON PC, APEX, EQUITY series Diagnostic E653 Tool B7651 10201 Use with EPSON QX-16 E654 . Write mechanism initial value, and perform print Y 4 9 9 0 3 5 0 2 0...
Page 215 REV.-A R O M A B O A R D EEEl P R I N T E R MECHAN;SM Figure 5-2. Extension Cable Connections...
Page 216 Provides anyone with a way to troubleshoot, regardless of technical or electronic expertise. A choice of programs offers various methods for repair, analysis, and testing of the printer. Defective units can be identified easily. (EPSON QXI 6, PC (EQUITY), etc.) using an RS-232C Connect this system to an MS-DOS-based computer cable.
Page 217 REV.-A Table 5-2. Printer Diagnostic System EPSON QX-16 EPSON PC (EQUITY) Computer #E653 #E654 Diagnostic Tool Floppy disk (2DSX 1) . Floppy disk (2DDX 1) Diagnostic cartridge Operational manual D-SUB 25 pin l/F cable” Cable AMPHENOL 36 pin l/F cable”z xl: The RS-232C l/F cable circuit is shown in Figure 5-4.
Page 218: Unit Replacement
REV.-A . , , , . [“’ . . . 5.2 UNIT REPLACEMENT The unit replacement is based on system analysis. According to the particular symptom found by the multimeter, the units listed in Table 5-3 need to be replaced, and Table 5-4 shows sympton and reference pages.
Page 219 REV.-A Table 5-4. Svm~toms and Reference Pages Reference Page Problem Indicators Symptom Printer does not operate at POWER LED on the control panel is not lit. all with power switch on. HF motor does not rotate. if the printer cover is not shut correctly, the LCD displays “CASE OPEN.”...
Page 220 REV.-A {“ 1. Printer does not operate at all with power switch on. Table 5-5. ROPS/ROPSE Board Output Voltages Power Output Terminal Output Voltage IVl (Connector CN2) – S i d e + Side 10-11-12 35V * 7.8-9 Approx. – 1 IV Approx.
Page 221 REV.-A carriage mechanism are not initialized. 2. Platen gap adjustment mechanism and rlnter power is turned on, e the mechanisms initialize Replace the CD display ‘ERROR 10*? printer mechanism. Use progrom ROMS* I with the same version CD display “ERROR 2“? number for the main and sub CPUS.
Page 222 REV.-A 3. Abnormal paper release mechanism operation R e p l a c e the panel unit. ontinuous poper ot t h e p r i n t i n g s t a r t Select ‘FRICTION” usin the PAP R SELECT switch.
Page 223 REV.-A 4. Incorrect printing with normal carriage operation a) In the self test or normal printing mode: Using a black ribbon. p e r f o r m p o p e r s e l e c t i o n , o f f .
Page 224 REV.-A b) In the self test: Using a color ribbon tnstall t h e C S u n i t n d colar r i b b o n cortridge. Replace power is turned on, rinter the CS unit. Replace the printer mechanism.
Page 225 REV.-A 5. Abnormal paper feed S T A R T Turn the printer power on and select the usin feed be selected paper feeding metho corresponding paper feeding system using <;;-;* )he PAPER SWCTSW itc& line feeding var mount of Replace the printer mechanism.
Page 226 REV.-A f’ ..6. Abnormal control panel operation ;-:, R e m o v e t h e p a p e r a n d t u r n t h e p r i n t e r power on.
Page 227 REV.-A 7. Incorrect printing in ON LINE mode Perform the self test. Refer to other troubleshooting items. Check the settings of the interface between the printer and host computer. Check the interfoce cable between the printer and host Change the settings. computer as follows: Are the signal connections correct? *1...
Page 228 REV.-A — WARN ING WAR NUN13 ATTENTION Hel B Choud 5 I 1321 9 17 C 128 ; 16 ~ 4 I C2C3C4Z420 <. (a) Back of the printhead % -..* 3 II 192 1 5 2 2 2 3 1 8 1 0 C 5 C 6 7 c7 Printhead connectors closeup Figure 5-5.
Page 229 REV.-A 5.3 UNIT REPAIR Unit repair is divided into three parts: ( 1 ) The ROPS/ROPSE board; (2) The ROMA board; (3) The Printer mechanism. This section will describe (l), the ROPS/ROPSE board unit repair. If (2) ROMA board or (3) Printer mechanism should need repair, use the diagnostic tool introduced in Section 5.1.1.
Page 230 REV.-A ROPS/ROPSE Board Unit ReDair Table 5-7. ——. - — —. — — — Solution Checkpoint Cause Symptom Observe the output Transistor Cll does not ~o DC voltage is Observe the voltage wave-form voltage waveform of between the base of Q 1 and pin xesent at the + 5 V, turn on.
Page 231 REV.-A Table 5-7. ROPS/ROPSE Board Unit ReDair Solution Checkpoint Cause Symptom . ObseNe the voltage between pins Replace IC2. The FET (Q3 (Q4)) does The +35 V line is not turn on. 12 and 7 of IC2. (Approx. 10.6 V) dead.
Page 232 REV.-A Table 5-8. ROPS/ROPSE Board Voltage Waveforms Voltage Waveform Condition S/DIV. – Side V/D IV. + Side ‘s”:’”9 osltlon Storage Emitter Base 2(Q3) A T=l I 7op 5 Base of 6pln o f 2 1 -T1 — — — Figure 5-9. Q2 Output/Ql Input Voltage Waveforms Storage Base...
Page 233 REV.-A Table 5-8. ROPS/ROPSE Board Voltage Waveforms flesuring + side Voltage Waveform S/DIV. Condition – Side V/D IV. position 2/.L Storage )3 (Q4) Gate Source )3 (Q4) Drain Source — — — - — — Figure 5-12. Q3 Input/Output Voltege Waveforms Storage 5pin ”...
Page 234 REV.-A ,6 ‘ Table 5-9. ROPS Board Main Parts List f. :: Description Classification Name Location 2.2 - 2.6V 50mA 250mW Zenor Diode HZ2CLL-TD ZD 1 500V 3A 40W Transistor 2SC3446 50V 2A 900mW 2SC2655-TPE6 50V 150mA 400mW 2SA 10 15-TPE2 ! 2SK556 450V 12A I FET...
Page 235 REV.-A 5.3.2 ROMA Board The ROMA board can be repaired using the diagnostic tool. Table 5-11 lists the main parts of the ROMA board. Table 5-11. ROMA Board Main Parts List Classification Name Description Location Refer to Table A-1. 74LSO0 74LS05 5B,6B 74LS 123...
Page 236: Figure 1-15. Model-5560 Printer Mechanism
REV.-A 5.3.3 Model-5560 Printer Mechanism Use the diagnostic tool to detect malfunctions among the motors, solenoids, and sensors. for these component. For other components, use the printing test, Table 5-12 lists the reference Tables and also inspect visually. Table 5-12. Electric Device List Reference Table Name Classification...
Page 237: Maintenance
REV.-A CHAPTER 6 MAINTENANCE 6.1 PREVENTIVE MAINTENANCE ............6-1 6.2 LUBRICATION AND ADHESIVE APPLICATION .
Page 238: Preventive Maintenance
EPSON recommends that the points illustrated in Figures 6-2, 6-3, and 6-4 be lubricated, according to the schedule listed in Table 6-2, with EPSON O-2, G-2 and G-27, which have been extensively tested and found to comply with needs of this priter. (Refer to Table 6-1 for details of O-2, G-2 and G-27.) Be sure that the parts to be lubricated are clean before applying lubricant, and avoid excessive application, which may damage related parts.
Page 239 REV.-A <-,., Table 6-2. Lubrication Points (Cent’d) ‘ i - . -, (Refer to Figures 6-2, 6-3, and 6-4.) Lubrication Points Lubricant Ref. No. G-27 (11) lever (right and left) Contact portion of frame and paper holding G-27 (1 2)X Contact portion of carriage guide shaft and frame (right and left) G-27...
Page 240 REV.-A -r- :? Figure 6-3. LQ-2550 Lubrication and Adhesive Application Points Diagram 2...
Page 241 REV.-A /7’ Figure 6-4. LQ-2550 Lubrication and Adhesive Application Points Diagram 3...
Page 242 REV.-A APPENDIX A.1 PRINCIPLE IC SPECIFICATIONS ..........A -1 A.1.l R O M A B o a r d .
Page 243 REV.-A Figure A-3. OP Code Fetch Timing ............A -5 Figure A-4.
Page 244 REV.-A Figure A-42. TL431 Pin Diagram ............. A-34 Figure A-43.
Page 245 REV.-A Connector Summary ............A-39 Table A-1 8.
Page 246: Principle Ic Specifications
REV.-A A.1 PRINCIPLE IC SPECIFICATIONS used in this printer. This chapter describes the principal ICS A.1.l ROMA Board Table A-1 shows the primary ICS used on the board. ROMA Table A-1. Primary ICS on the ROMA Board Reference Type Description Name of IC Location Section...
Page 247 REV.-A ,6 :, A . 1 . l . l HD64180 i,,’ The HD64 180 is an 8-bit one-chip CPU, and is software compatible with model 2-80 and higher models. The chip includes a DMA controller (DMAC), asynchronous serial communication interface (ASCI) (2 channels), serial 1/0 and timers (one with internal and one with external output), in addition to port,...
Page 248 REV.-A Timing — &— Generator E!E!E!= — DREQI — TENDI > DMACS AIs/TOUT - Txs - RXSICTSI - Asynchronous RXAO CKS - (channel O) RTSO < Asynchronous CKAI/TENDo > (channel 1) — RXI% > < Address Data ‘;: DO-D7 AO-A17 Figure A-2.
Page 249 Table A-2. HD64180 Terminal Functions Notes Description Pin No. Terminal +5 VDC — 1, 33 XTAL External oscillator (1 2.2 MHz) EXTAL Pulled up Reset IC (1 4A: ROUT, pin 21) RESET signal Address bus (1 9-bit, 5 12K-byte) 1 3 - 3 1 AO-A 18 Data bus (8-bit) 3 4 - 4 1...
Page 250 REV.-A CPU Timing Two oscillator cycles define one state. One machine cycle, such as OP (operational) code fetch or memory read/write, requires three states. a) OP code fetch timing During the first half of state T1, the contents of the program counter (PC) are output on address bus lines AO to Al 8.
Page 251 REV.-A ~,,, A.1.1.2 PPD781OHG ~< / The wPD78 10HG is a one-chip 8-bit CPU and includes two 8-bit timers, an 8-bit A/D converter, 256-byte RAM, and a serial interface. The main features of this chip are as follows: 256-byte RAM Direct addressing of up to 64K bytes 8-bit A/D converter .
Page 252 REV.-A Figure A-6. PPD781OHG Block Diagram...
Page 253 REV.-A Table A-3. ~PD781 OHG Terminal Functions Signal Notes Description Terminal Name External 8-bit parallel l\F Parallel l/F AUTO FEED XT AFXT signal External 8-bit parallel l/F Parallel l/F SLIN signal SLIN Printer mechanism CRHM CR home position sensor sig- nal HOME/OUT Printer mechanism PA 1...
Page 254 REV.-A Table A-3. PPD781OHG Terminal Functions Signal Notes Description Terminal Name +35 V line voltage detection Printhead, upper case Printhead temperature and AN 1 printer cover OPEN/CLOSE detection Optional image scanner Image scanner signal Printer mechanism PW sensor signal Printer mechanism PT sensor signal Control panel CONDENSED, PAPER SE-...
Page 255 REV.-A #-., Timing Three oscillator cycles define one state. One read/write machine cycle requires three states, and one OP code fetch machine cycle requires 4 states. Wait states cannot be inserted. OP Code Fetch Timing The OP code fetch timing consists of four states, T1 to T4. During T1 to T3, program memory is read, and instructions are processed (decoded) during T4.
Page 256 REV.-A Memory Write Timing The memory write timing consists of three states, T1 to T3. Timings for address output and the ALE signal are the same as those for the memory read machine cycle, however, AD7 to O (PD7 to O) are not disabled after the memory address is output, and write data is output on AD7 to O from the beginning of T2 to the end of T3.
Page 257 REV.-A A.1.1.3 27512 which is an ultra-violet erasable and electrically programmable The 27512 is an EPROM, ROM. ‘; Features: 28 Va 65536 words X 8 bits A!r 2 TTL compatible input/output Al 3 20 Ala 2 5 Aa +5V single power AS 5 24 At Acccess time: 200 ns (max.)
Page 258 REV.-A A.1.1.4 27256 EPROM, which is a ultra-violet erasable and electrically programmable ROM. The 27256 is an Features: X 8 bits 32768 words :::m::: TTL compatible input/output Al 3 25 A a V single power supply 24 A 9 Access time: 250 nS (max.) 23 Aft 28 pins (DIP) 21 A,IJ...
Page 259 REV.-A f“’” A.1.1.5 HM65256Bsp-15 low power consumption and TTL The HM65256BSp-15 is a CMOS pseudo static RAM, and features compatible input/output. Features: 32768 words X 8 bits TTL compatible input/output +5 V single power supply ~ access time: 150 nS (max.) 28 pins (DIP) Terminal Functions: AO to Al 4: Address input...
Page 260: Wpd43257C-15L
REV.-A A.1.1.6 wPD43257C-15L The wPD43257C-15L is a CMOS static RAM, features low power consumption, and has standby mode so that the memory can be backed up with a battery. Features: 32768 words X 8 bits TTL compatible input/output +5 V single power supply .
Page 261: Eo5A1Oaa
REV.-A A.1.1.7 EO5A1OAA The E05A 10AA is a gate array, and includes a memory management unit, reset circuit, and memory - refresh circuit. ~ “ — Pi%E 63 “ — CSBCO 62 — — 61 — — 60 ~ — 59 —...
Page 262 REV.-A Table A-8. EO5A1OAA Terminal Functions Notes Description Name IC (1 2A: Al 7, pin 30), Bank select O BANKO IC (12B: Al 7, pin 30) IC (1 2A: Al 8, pin 31) BANK 1 Bank select 1 Not used Bank select 2 BANK2 Not used...
Page 263 REV.-A Table A-8. EO5A1OAA Terminal Functions Notes Description Name IC (1 3A: REF, pin 57) Refresh cycle Read strobe Write strobe IC (9A: ~, RANI select pin 20) RANI IC (1 1A: ~, pin 20) or CN6 ROM (PROG.) select PRO I (PROG pin 42) CN4 (SLOT-A: PROG, pin 26)
Page 264: E05A02La
REV.-A A.1.1.8 E05A02LA when processing print data. The E05A02LA is a gate array IC used to lighten the load on the CPU D O - D 7 Data Latch DO*2 > Block 1 Commands/REDY/ e. W Control Data Latch Block 2 * —...
Page 265: E05A09Ba
REV.-A A.1.1.9 E05A09BA The E05A09BA is a gate array used to separately control two 4-phase stepper motors. V(JD POT 2 Do I FE3Y c o I POT O S C K Bo I AO 1 RC K AD O PO T AD I D 0 2 AD 2...
Page 266 REV.-A Table A-10. E05A09BA Terminal Functions Description (3B) Description (4B) Terminal Address bus O Address bus 1 AD 1 Address bus 2 Address bus 3 Pulled up TM 1 CR motor synchronous pulse Pulled up PF motor synchronous pulse Read pulse Write pulse Pulled up POTO...
Page 267 REV.-A #-:.:, A.1.1.1O M54610p %. “ The M546 10P is an IC used to simplify data processing between the host computer and CPU. ‘1 — 4 2 — V c c 41 —Ei15 imz— 2 4 0 — — 3 3 9 —...
Page 268 REV.-A Table A-1 1. M5461OP Terminal Functions Description Signal Direction Name — DIN8 I/F data (8 to 1) +- HOST 8-bit parallel DIN 1 DOU 1 8-bit parallel l/F data (1 to 8) + CPU ’ DOU8 ~ HOST STROBE pulse ~ HOST BUSY BUSY signal...
Page 269: Stk6981 H
REV.-A ~,..,, A.1.l.l 1 STK6981 H The STK6981 H is a unipolar constant current chopper type driver IC, and includes a control/drive circuit for a 4-phase stepper motor. ---- - - -- 1 2 3 4 Figure A-26. STK6981 H Pin Diagram LiJl Figure A-27.
Page 270 REV.-A Table A-1 2. STK6722H Terminal Functions Description Terminal + 3 5 V D C — PF motor coil A/C drive voltage ACcOM PF motor coil B/D drive voltage PF motor coil A drive pulse PF motor coil B drive pulse PF motor coil C drive pulse PF motor coil D drive pulse AOUT...
Page 271 REV.-A ::7,, A.1.1.12 S1-7304 The S1-7304 is a unipolar constant current chopper type driver IC, and includes a control/drive circuit . for a 4-phase stepper motor. & - - - - - - - - - - - - - - - - - - - - 1 2 - - - - - - - - - - - - - - - - - - - 1 9 2 0 Figure A-28.
Page 272 Table A-1 3. S1-7304 Terminal Functions Description Terminal + 3 5 — CR motor coil A/C drive voltage C O M CR motor coil B/D drive voltage BDCOM CR motor coil A drive pulse CR motor coil B drive pulse CR motor coil C drive pulse CR motor coil D drive pulse AOUT...
Page 273 REV.-A ~. k A.1.1.13 H8D2148 ~.,,, IC with The H8D2 148 is an temperature detection and feedback circuits, and is used to control the 2-phase stepper motor. D2148 1 2 3 ..13 Figure A-30.
Page 274: Stk66082E
REV.-A A.1.1.14 STK66082E The STK66082E is a unipolar constant current chopper type driver IC, and includes a drive circuit for the solenoids of the printhead. White Line . 0’ STK66082E “o o“ 11111111111111111111111111 11111111111111 1 5 1 7 1 9 2 1 2 3 2 5 2 7 2 9 3 1 3 3 3 5 3 7 3 9 4 1 3 5 7 9 11 2 4 8 8 10 12 14 1 6 1 8 2 0 2 2 2 4 2 6 2 8 3 0 3 2 3 4 3 6 3 8 4 0 (a) Front View...
Page 275 0,$, “,> 0,0,3, ,.2, 4, ,7,,38 0 ,>, ,30 0 (i.) 1731 + 3 1441 4 t? #s*, ,70, as ,’s114 412 1s31 ,64,2> -.0 a, ,Ut 4 Jalsll 4 * 1ss1 6’7, M ,’,,28 4 * ,s78 ,6,,2, + m 1s08 + a 8+s, 1911 10 1901 *...
Page 276 REV.-A Table A-1 5. STK66082E Terminal Functions Input Side Output Side Description Pin No. Terminal Terminal Pin No. Printhead solenoid #1 drive i i i Common line for printhead solenoids #1, #9, and #17 Printhead solenoid #5 drive Common line for printhead solenoids #5, #13, and #21 Printhead solenoid #12 drive Common line for printhead solenoids # 12, #20, and #24...
Page 277 REV.-A . , + , <’ Table A-1 5. STK66082E Terminal Functions Input Output Side Side Description Pin No. Terminal Pin No. Terminal +35 VDC input ON/OFF PNP 1 PNP2 PNP3 PNP4 NU 1 Printhead drive Tr. (X 24) base pulled up (by Vx) Pu 1 +35 VDC switching Tr.
Page 278 REV.-A A.1.1.16 7405 A.1.1.15 7400 ‘CC VCC 4B 10 IY Gt4D Figure A-35. 7405 Pin Diagram Figure A-34. 7400 Pin Diagram A.1 .1 .18 74175 A.1 .1.1 7 74123 4< cl-m L---J Cima Figure A-36. 74123 Pin Diagram Figure A-37. 74175 Pin Diagram A.1.1.20 7 4 3 7 3 A.1.1.19 74365 EM&LE...
Page 279: Tl431
REV.-A A.1.1.23 TL431 The TL431 is a high-accuracy temperature compensated shunt regulator. The output voltage can be changed between 2.5 and 35 V using two external resistors. The TL43 1 has high stability and outputs a large current so that it can replace various Zener diodes. Features: Temperature compensated feedback voltage: 50 PPM/”C TYP Low Zener current: 400 WA TYP.
Page 280 REV.-A A.1.2 ROPWROPSE B o a r d Table A-1 6 shows the primary ICS on the ROPS/ROPSE board. Table A-1 6. Primary ICS on the ROPS/ROPSE Board Name of IC Type Description Reference Section Location A. 1.1.23 L5431 -AA power type TL431 TL594CN Switching Regulator...
Page 281: Tl594
REV.-A & ‘1 A.1.2.1 TL594 ‘~ and consists of two error amplifiers, a comparator, reference The TL594 is a switching regulator IC, generator, dead-time control circuit, and power transistors. voltage generator, sawtooth waveform REF O U T P U T INPUT CONTROL VCC C 2 E 2 El...
Page 282: Njm2903
REV.-A A.1.2.2 NJM2903 The NJ M2903 includes two comparators. The main features are as follows: Single power supply . Open collector output Voltage range: +2 to +36 V OuTp”TAm’3P’v+ INVERTING 4 I I OUTPUT B I N P u T A –...
Page 283: Connector Pin Assignments
REV.-A CONNECTOR PIN ASSIGNMENTS summary A-18 Figure A-46 shows interconnections of the primary connectors and cables. Table gives of each connector. NOTE: The signal directions for the connectors are as viewed from the ROMA board. CARRIAGE HOME POSITION SENSOR PAPER THICKNESS SOLENOID.
Page 284 REV.-A Table A-1 8. Connector Summary Reference :;;;:’ Destination Description Cable loard connector Table Prepared 1-12 Host computer l/F (8-bit parallel) lOMA CN 1 on the us- loard er side l/F (option) A-1 9 #8 IXX VF Board Prepared 1-15 Host computer l/F (RS-232C serial) on the us-...
Page 285 REV.-A Table A-1 9. CN2 Pin Assignments Description Signal Pin No. Error ERROR Paper end Data bit 6 D6 (B4) BUSY (READY) BUSY Data bit 5 D5 (B3) ACKNLG Acknowledge Data bit 4 (Parity disable) D4 (Par-dis) INIT Initialize D3 (0/E) Data bit 3 (Odd/Even parity select) STROBE Strobe pulse...
Page 286 Table A-20. CN4 Pin Assignments Description Pin NO. Signal Data bus 5 Data bus 4 Data bus 7 Bank 1 AB 1 Address bus 5 Address bus 6 A lO Address bus 10 Reset signal — Address bus 9 Address bus 8 Data bus 2 Data bus 1 Read strobe...
Page 287 Table A-21. CN5 Pin Assignments Description Signal Pin No. Data bus 5 Data bus 4 Data bus 7 Ae 1 Bank 1 Address bus 5 Address bus 6 Address bus 10 8 \ R I I Reset signal — . . . , . . Address bus 9 lAddressbus8 I,’...
Page 288 REV.-A Table A-22. CN6 Pin Assignments Description Signal n No. Address bus 12 Address bus 7 Address but 6 Address bus 5 Address bus 4 Address bus 10 A lO Address bus 1 Address bus O Data bus O Data bus 1 Data bus 2 + 5V DC I GND I...
Page 289 REV.-A Table A-22. CN6 Pin Assignments Description Signal Pin No. Not connected A l a — Bank 1 Al 5 ROM OE Signal KANJI Kanji C.G Not connected — CG3 select Not used PROG Write pulse used Table A-23. CN7 Pin Assignments Description Pin No.
Page 290 REV.-A Table A-25. CN9 Pin Assignments Description Signal Pin No. Scan data IMSN Analog ground — + 5 VDC Paper width signal PWSN Ground — CS unit enable CSEN Ground (for drive circuits) — + 3 5 VDC + 3 5 CS motor coil A CS motor coil B...
Page 291 Table A-27. CN1 1 Pin Assignments Description Signal Pin No. Printhead solenoid # 1 Printhead solenoid #9 Printhead solenoid #17 Common (+35 VDC) line Printhead solenoid #5 Printhead solenoid #13 Printhead solenoid #21 Common line (+35 VDC) ,, 5 Printhead solenoid #12 Printhead solenoid #20 Printhead solenoid #24 Common line (+35 VDC)
Page 292 REV.-A Table A-31. CN15 Pin Assignments Description Signal Pin No. Paper end signal PESN Ground Table A-32. CN16 Pin Assignments Description Pin No. Signal PGAC Common line for PG motor coils A and C (+35 VDC) PGBD Common line for PG motor coils B and C (+35 VDC) PG motor coil A PG motor coil C PG motor coil B...
Page 293 REV.-A #-!:.. Table A-36. CN20 Pin Assignments Description Pin No. Signal RL sensor signal R L S W RL sensor enable signal + 3 5 VDC + 3 5 RL solenoid ON/OFF RLPL Table A-37. CN21 Pin Assignments Pin No. Signal + 5 VDC Printer cover OPEN/CLOSE signal...
Page 294: D R A W I N G S
REV.-A I A . 3 D r a w i n g s UNIT Y4S620200000 6.3A~2SV -’e ‘0- - - - - ‘“- - l-.~: Component Layout A - 4 9...
Page 295 REV.-A <’:’” )(J7 gv~gilNN’lEo “ PROTECTION AGAINST RISK OF FIRE, REPLACE O WITH SAME TYPE ANO RATINGS I v– f’::, ..:’ It u — ‘k — — n 9 ’ . . !?40 — 6— “u 111+ n u ye:” Figure A-48.
Page 296 REV.-A Q-Lo I I I =--- n — — — — > < ‘5 “’/:..—.. 1 — =6xm Figure A-49. ROPS Board Circuit Diagram A-5 1...
Page 297 REV.-A “ .< Figure A-50. ROPSE Board Circuit Diagram A-52...
Page 298 REV.-A :,-]:,@g:c ‘ 4 5620’ 0 0000 ‘N” rru, 6600>1 :.. . — —. ‘z .——-...C!U > — !E:-7; ‘=”” —.-—-–.——.-—~ : Figure A-51. ROMA Board Component Layout A-53...
Page 299 REV.-A Figure A-53. ROPNL Board Component Layout Table A-41. ROPNL Board LED Layout Table A-40. ROPNL Board Switch Layout Name Switch Name Switch LED 1 POWER Svvl ON LINE LED2 READY FORM FEED LED3 ON LINE SVV3 LINE FEED LED4 TRACTOR LOAD/EJECT LED5...
Page 300 REV.-A — J’ - — J-++’ t -!-!- Q’” SED1200FOA +& < L3Kx3 MSM5937 IRS Figure A.54. ROPNL Board Circuit Diagram A-56...
Page 301 REV.-A Figure A-57. Model-5560 Exploded Diagram 2 Figure A-58. Model-5560 Push Tractor Unit Exploded Diagram A-59...

Epson LQ-2550 Technical Manual

Table of Contents

Chapter 1 General Description

Chapter 2 Operating Principles

Disassembly, Assembly, and Adjustment

Chapter 3

Chapter 4

Chapter 5

Chapter 6 Maintenance

Appendix

Quick Links

Chapters

Related Manuals for Epson LQ-2550

Summary of Contents for Epson LQ-2550

Table of Contents