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 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 REVISION TABLE REVISION DATE ISSUED CHANGE DOCUMENT Aug. 31, 1987 1st issue...
Page 5 REV.-A TABLE OF CONTENTS GENERAL DESCRIPTION CHAPTER 1. OPERATING PRINCIPLES CHAPTER 2. CHAPTER 3. OPTIONAL EQUIPMENTS DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT CHAPTER 4. TROUBLESHOOTING CHAPTER 5. MAINTENANCE CHAPTER 6. APPENDIX vi -...
Page 6: Table Of Contents
CHAPTER 1 PTION GENERAL FEATURES ....................SPECIFICATIONS .
Page 7 LIST OF FIGURES 050 ........1- 1 Fig.
Page 8 REV.-A LIST OF TABLES Table 1-1. Optional 1-2. Optional Interface Boards ........... 1- 2 Line Feed Speeds .
Page 9 Auto ejecting of cut sheet paper and of fanfold paper Printing of fanfold paper without removal of the cut sheet feeder (option) Optional interface for the EPSON 8100 series Optional low-priced, cut sheet feeder which single-bin...
Page 10 Table 1-1. Optional Units Name Tractor unit #73 11 Tractor unit #731 2 Cut sheet feeder (single-bin) # 7 3 3 9 # 7 3 4 0 Cut sheet feeder (single-bin) # 7 7 5 3 Ribbon cartridge # 7 7 5 4 Ribbon cartridge # 7 4 0 0 Courier font-module...
Page 11: Specifications
REV.-A 1.2 SPECIFICATIONS 1050 communicates with a wide variety of host computers, with aid of the optional Identity Module. However, this section describes the specifications for the printer without the Identity Module option. Specifications not affected by firmware (hardware specifications) are the same whether or not the Identity Module is installed.
Page 12: Table 1-4. Cut Sheet Paper Specified Conditions
REV.-A Do not more than 1/6 inches. perform reverse feeding for Because accuracy of paper feed cannot be assured, do not perform reverse feeding after the paper end has been detected. b) When using pull tractor feed: Remove the paper tension unit and mount the pull tractor unit. Use the paper path when a single sheet is inserted.
Page 13: Fig. 1-3. Cut Sheet Paper Printable Area
Table 1-5. Fanfold Paper Specified Conditions 1 0 . O ” ) 101 - 254 (4.0 - [ m m ] Width Copies [sheet] 4 (1 original + 3 ) at normal temperature 3 (1 original + 2 ) at all temperature range Plain paper Quality 0 .
Page 14: Fig. 1-4. Fanfold Paper Printable Area
REV.-A Fanfold paper See Figure 1-4. 4 - 1O*1(1 6)”, 101 - 254 (406) mm P r i n t a b l e a r e a Printable area 0.35”, 9 mm 0 - - m o r e - - - - - - - - - - - - - - - - - - —...
Page 15 NOTES: 1. Printing of labels is only available at normal temperature. 2. Labels must be fanfold. 3. Labels with pressure-sensitive paper must be jointed by pasting along the dots or lines, and the total thickness must be less than equal to 0.3 mm (O. 8“) to be printed out under conditions that must be between 5 to 35 “C and 20 to 4.
Page 16: Table 1-10. Environmental Conditions
REV.-A Dimensions See Table 1-8 (Details are shown in Figures A-45 and 46.) W e i g h t See Table 1-8. Table 1-8. Dimensions and Weight Weight [Kg] Width [mm] [mm] Depth [mm] Height 4 3 0 3 6 0 6 0 5 1 4 2 3 6 0...
Page 17: Firmware Specifications
REV.-A Safety Approvals (U.S.A. version) Safety standards CSA22.2#l 54 (Europe an version) Radio Frequency FCC class B (U.S.A. version) VDE871 (self-certification) (Europe version) Interference 1.2.2 Firmware Specifications Control Code Printing Direction Text Bidirectional with logic seeking Unidirectional Bit-image 8 bits Character Code 96 ASCII and 13 international character sets Character Set...
Page 18 Table 1-11. Mode Printable Double Printing Speed Print Columns Width sized ter Pitch Pitch [cPI] Draft 17.1 2 6 4 @ 7 < Ignored — Max. Max. 1 1 6 Min. 160 Min. — Max. 34 Max. — Min. 80 Min. ‘proportional —...
Page 19: Fig. 1-6. Character Matrix
REV.-A See Figure 1-6 and Table 1-12. C h a r a c t e r M a t r i x (Superscript Character) 24 are not used when superscript (Normal Character) Pin Nos. 17 to printing. Ascender Area Ascender Area (15P itch - 8 P (a 2 —...
Page 20: Table 1-12. Character Matrix And Character Size
REV.-A Character Size See Table 1-12. Table 1-12. Character Matrix and Character Size Character Size Unit Printing Mode Face Matrix V. (mm) 1.9 X 3.2 9 X 23 DRAFT, 10 pitch 1.9 X 3.2 DRAFT, 12 pitch 9 X 23 9 X 16 DRAFT, 15 pitch .
Page 21: Interface Overflew
1.3 INTERFACE OVERVIEW 050 has both 8-bit parallel interface and RS-232C serial interface as standard. They can be selected by DIP switches 2-3 and 2-4 respectively. (This detail of DIP switch settings, refer to Table 1-1 7.) 1.3.1 8-bit Parallel Interface Specifications 8-bit Data Transmission Mode By STROBE pulse...
Page 22: Serial Interface
REV.-A 1.3.2 Serial Interface Specifications serial Data Transmission Mode Asynchronous Synchronization (REV) signal or protocol Handshaking Refer to Table 1-13 and Figure 1-9. Table 1-13. Serial Interface Handshaking Signal X-ON/OFF protocol Description X-OFF (13H) MARK When the number of bytes remaining in the input buffer reaches 256 or less, the signal level goes to MARK, or a X-OFF code is sent out to the host computer.
Page 23: Fig. 1-10. Serial Data Transmission Timing
- - - - - - ( -v) - - - - - - - - - - - - - - - - - - - - - [ -v] Stop Bit Data Bit Start Handshake Data Bit Stop Bit ( -v) -T’...
Page 24: Dip Switch And Jumper Settings
DIP Switch and Jumper Settings The DIP switches that users can set are SW1 and SW2. These switches are positioned at the rear of the printer, and have the functions as shown in Tables 1-14 through 1-18, (note that the status of the DIP switches are read only when the printer power on or an INIT signal is input.) Table 1-14.
Page 25: Table 1-16. Dip Switch 2 Settings
Table 1-16. DIP Switch 2 Settings DIP SW. Function 12“ “ Page length I 1“ Valid Invalid skip-over perforation See Table 1-17. Interface selection Baud rate selection See Table 1-18. Valid Tear off mode Invalid Valid- Invalid Auto LF Table 1-17. Interface Function Parallel Serial, Even parity...
Page 26: Table 1-19. Jumper Setting
REV.-A 1-12 shows the factory settings for DIP switches SW-1 and SW-2. Country U. S. A., Southeast Asia, Middle and Near East Germany, Northern Europe U. K., Australia F r a n c e , Spain White areas indicate the setting. 1 and 2 Factory Settings Fig.
Page 27: Self-Test Operation
REV.-A 1.5 SELF-TEST OPERATION 050 printer has the following self-test operation. The control ROM version No. and the DIP switch settings also printout when the self-test is performed. Table 1-20 lists the self-test operating instructions and Figure 1-13 shows the self-test printing. Table 1-20.
Page 28: Hexadecimal Dump Function
1.6 HEXADECIMAL DUMP FUNCTION In hexadecimal dump mode, the printer prints out the data it in hexadecimal format. The printer prints a column of 16 hexadecimal values, folIowed 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 (.
Page 29: Printer Initialization
1.7 PRINTER INITIALIZATION There are two initialization methods: hardware initialization and software initialization. 1.7.1 Hardware Initialization This type of initialization occurs when printer power is turned on or when the printer receives the INIT signal from the host via the 8-bit parallel interface. When printer is initialized in this way, it performs the following actions: Initializes printer mechanism Clears downloaded character set...
Page 30: Buzzer Operation And Error Conditions
REV.-A 1.8 BUZZER OPERATION AND ERROR CONDITIONS This section describes the buzzer operation and error conditions of the printer. 1.8.1 Buzzer Operation The buzzer ring as follows: . When a BEL code is sent to the printer, the buzzer sounds for 0.5 seconds .
Page 31: Main Components
REV.-A 1.9 MAIN COMPONENTS 1050 printer includes the following major subassemblies: Model-53 10/5360 printer mechanism MONMA board (main board) MONPL board (control panel) (power supply board, 120V and versions) board Figure 1-15 shows the 050 component locations. NOTE: the paper tension unit and push tractor unit are excluded. Fig.
Page 32: Paper Leading And Paper Ejection
REV.-A 1.9.1.1 Paper Loading and Paper Ejection The paper release lever has a disengage capability for the optional pull tractor unit’s drive mechanism. Therefore, these printers provide some improved paper handling functions that can be performed by using a combination of the paper release lever and LOAD/EJECT switch on the control panel. Single Sheet Loading and Ejection load a sheet of paper, position the paper release lever back, place the page along the paper guide, and press the LOAD/EJECT switch.
Page 33 1.9.2 Board (Main Board) Figure 1-17 shows the board, which contains a 10HG CPU to control the operation of the printer. Driver circuits for the motors, sensors, and are also included on this board. Other main on the board are: Universal M546 10P (5A) .
Page 34: (Power Supply Circuit Board)
1.9.3 Board (Power Supply Circuit Board) The power supply circuit board is located on one of two boards, the for 120 V AC operation and the for 220/240 V operation. The basic construction of the two boards is the same: each board contains a power switch, fuses, line filter circuit, and switching regulator circuit.
Page 35 Control Panel In the control panel, there are four square switches, three rectangular switches, and fifteen LEDs, as shown in Figure 1-19. The functions of the switches and immediately below the illustration. — , — P O W E R P O W E R R E A D Y PAPER OUT - , —...
Page 36 REV.-A LOAD/EJECT Switch Pressing this switch loads or ejects the paper (If a page is inserted into the cut sheet feeder, it is loaded; if a page is already loaded, it is ejected). Details of the paper loading and ejection process are described in Section 1.9.1.1.
Page 37: Housing
1.9.5 Housing lower cases and accommodates the printer mechanism, control The housing consists of the upper and circuit board, and power circuit. The optional cartridges (i.e., font and identity modules) can be mounted easily without removing the upper case. Figure 1-20 shows the 1050 housings.
Page 39 CHAPTER 2 OPERATING PRINCIPLES OVERVIEW ....................2- 1 2.1.1 Connector Summary .
Page 40 2.3.2.2 Serial interface..........2-32 2.3.3 Control Panel Interface Circuit .
Page 41 REV.-A Frioction Feeding Method ............2 - 9 Fig.
Page 42 REV.-A Fig. 2-44. DC Line Voltage Monitoring Circuit ......2-43 Fig. 2-45. DC Line Voltage Compensation Sequence ... 2-43 Fig.
Page 43: Overview
2.1 OVERVIEW This chapter describes the signals at the various connectors that connect the primary components of 050, including the model-53 10/5360 printer mechanism, MONPS/MONPSE power This chapter also describes the operation supply board, control board, and the control panel. of the printer’s electric circuitry and printer mechanism.
Page 44 REV.-A Table 2-1. Boards Connector Summary Reference Connector Pins To or From Table l/F (parallel) A-1 2 CN 1 Host computer MONMA A-1 3 Option l/F board A - 1 4 Host A-1 5 Not used Japan only A-1 6 Font module Slot B Font module...
Page 45: Printer Mechanism Operation
REV.-A Printer Mechanism Operation 2.1.2 The Model-53 is a serial printer mechanism equipped with a 24-pin impact dot printhead. Two new features have been added for more efficient paper handling: automatic paper loading/ejecting, and top margin fine adjustment (tear-off mode). The printer mechanism is divided into three parts: 1 ) the printing mechanism;...
Page 46: Printing Mechanism
2.1.2.1 Printing Mechanism The printing mechanism includes the inked ribbon, and platen. Figure 2-3 shows the printing mechanism and Table 2-2 lists the specifications. The has 24 dot wires which are arrayed in two 12 wire lines. Each dot wire is connected to its own drive coil. The basic printing operations are as follows: The drive signals, transferred from the control circuit to the drive circuit, are converted...
Page 47: Carriage Mechanism
2.1.2.2 Carriage Mechanism Carriage mechanism Figure 2-4 shows the carriage mechanism. The printhead is mounted on the carriage, and the entire unit is supported by the two carriage The carriage is fixed to the timing belt on one side guide shafts. and is moved when the carriage motor drives the timing belt.
Page 48 REV.-A Ribbon Feed Mechanism The ribbon feed mechanism consists of the ribbon feed mechanism and ribbon carriage. Figure 2-5 shows the ribbon feed mechanism. Ribbon Feed Rolk R i b b o n Roller Breaking Belt Driven Pulley Planet Gear Ribbon Driving Gear Fig.
Page 49: Paper Feed Mechanism
2.1.2.3 Paper Feed Mechanism The paper feed mechanism feeds the paper after the printing mechanism and the carriage mechanism finish printing one line. The paper feed motor is driven to rotate the platen tractor via the paper feed gears. The paper feed mechanism includes two sensor mechanisms: A paper end sensor to detect the presence/absence of the paper, and a friction/tractor sensor to detect the paper feeding mode (push tractor feed or friction feed).
Page 50 Push Tractor Feeding Method (Figure 2-6) Paper feeding is performed by driving the paper feed motor with the paper release lever set forward to load fan-fold paper into the tractor unit. A paper tension unit is installed at the exit of the case to prevent irregular paper feeding and slackening.
Page 51 Friction Feeding Method (Figure 2-7) 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 with the platen and paper unit is used to prevent paper feed feed roller.
Page 52: Power Supply Circuit Operation
REV.-A 2.2 POWER SUPPLY CIRCUIT OPERATION board) The DC voltages required to operate the mechanisms and control circuits are supplied from the supply board in this unit. There are two kinds of power supply boards, the board for 100 V or 120 V operation and the board for 220 V or 240 V operation.
Page 53 REV.-A of the power supply circuit. External noise on the AC line is Figure 2-8 shows a block diagram first attenuated by the input filter circuit. Then the AC voltage is converted to DC by the full-wave rectifier, and is smoothed by the smoothing circuit. surge current that flows when the power is turned on.
Page 54: Input Filter Circuit
REV.-A 2.2.2 Input Filter Circuit Figure 2-9 shows Input filter circuit. The filter circuit attenuates external noise and inhibits noise generated in the printer from going out over the AC line. The coils-and capacitors employed in this filter are able to handle fluctuations of the AC input line. Frame ground (F. G.) is connected between C5, which handle leakage current from the frame to the AC line.
Page 55: Main Switching Circuit
SURGE ‘ INPUT VOLTAGE POWER ON Fig. 2-11. Surge Current The voltage across C6 increases after the power is applied, and the current is accordingly stabilized. Until the voltage across becomes stable, the surge current is limited by a resistor in series with capacitor C6.
Page 56 REV.-A y - - - - - w Fig. 2-12. Main Switching Circuit 2-14...
Page 57: Surge Absorber
REV.-A I (A) ( A ) of Q 1 0 3 5 1 0 - AVERAGE Fig. 2-14. RCC System Switching Operation Fig. 2-13. Waveforms at Primary and Secondary Sides of 2.2.4.2 Surge Absorber When switching transistor is turned off, a large opposite-polarity surge voltage is amplify the collector voltage of Q 1.
Page 58: Line Output Voltage Limiting
REV.-A 2.2.4.3 +35 V Line Output Voltage Limiting The back electromotive described in 2.2.4.1 causes diode D20 on the secondary side of transformer T1 to conduct, which supplies power. Consequently, the amount of energy stored by the transformer during a of time becomes equal to the power output.
Page 59: Over Voltage Protection Circuit
REV.-A 2.2.4.4 Over Voltage Protection Circuit As described in 2.2.4.3, the power supply circuit of this unit not only uses the output voltage stabilizing circuit to stabilize the output voltage and provide feedback to the switching circuit, but it also contains an over voltage protection circuit to protect against malfunctions of the constant voltage generation circuit.
Page 60: Switching Regulator Circuit
REV.-A 2.2.5 +5 Switching Regulator Circuit Figure 2-17 shows the +5 switching regulator. This circuit employs a hybrid type switching regulator STR20005 which consists of a voltage circuit along with coil capacitor at the external output section. S T R 2 0 0 0 5 (xc 20) +5 v...
Page 61: Soft Start
REV.-A Fig. 2-18. Input and Output Voltage Comparison 2.2.5.3 Soft Start When power is supplied capacitor C 1, connected between the side and GND, increases negative output at time constant R3 X so that the on-time of gradually becomes longer (Refer 2-1 9.).
Page 62: Half-Wave Rectifier-Smoothing Circuit
REV.-A 2.2.6 VDC Half-Wave Rectifier-Smoothing Circuit The power from this circuit is mainly supplied to the RS-232C Interface on the optional interface board. Both the + 12 V and – 12 V lines have their own half-wave rectifier circuits. The smoothing circuits consist of capacitors C23 and C24, and include dummy resistors which control the rise of voltage when the...
Page 63 REV.-A 2.3 CONTROL CIRCUIT BOARD OPERATION MHz as the This printer employs an 8-bit one-chip CPU 10HG) with a clock frequency of 14.75 employs an E05A01 LA gate array ( containing a memory main control device. It also management circuit so as to extend the memory and areas and simplify the support circuitry.
Page 64: Reset Circuit
REV.-A 2.3.1 Reset Circuit Figure 2-22 shows the reset circuit. After being input to gate array EO5A1OAA 10C), the RESET signal resets the gate array and is then sent out to the other devices. Hardware reset is performed when: 1. The printer power is turned on or off. 2.
Page 65: Power On/Off
REV.-A 2.3.1.2 Power ON/OFF When the power is switched on and Vx rises, voltage is applied to the integration circuit (composed of R88, D48). The voltage at increases according to Vx ( 1 – e ~) and when reaches Vp the output is switched from low to high (Schmitt trigger), and the reset circuit in the sets the ROUT signal high 1 ).
Page 66 REV.-A 2.3.1.3 Signal Input from When the I NIT signal is input from outside (it should be low for 50 or more), it reduces the voltage at the CPU and terminals via the integration circuit C26, and the M546 10P (5A), and R89.
Page 67: Font/Identity Cartridge Installation
REV.-A 2.3.1.4 Font/Identity Cartridge Installation and Removal The font and identity cartridges 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 main board circuit malfunction. After reset, the CPU starts execution from address and sends a RD signal to the external memory devices.
Page 68: Static Ram (8A) Battery Backup Circuit
REV.-A 2.3.1 .5” Static RAM (8A) Battery Backup Circuit The memory static RAM (8A) employs a lithium battery (3.00 to 3.35 VDC) for backup, to maintain parameters and data when the power is turned off. Figure 2-26 shows the static RAM (8A) battery backup circuit.
Page 69: Interface
REV.-A 2.3.2 Interface This printer has both 8-bit parallel interface and RS-232C serial interface. 2.3.2.1 8-Bit Parallel Interface Operating Principle Figure 2-27 shows the 8-bit parallel interface data transmission timing. Data is transferred between a host computer and the printer using the following sequence: BUSY DATA STROBE...
Page 70 Table 2-11. M5461OP Terminal Function Function Direction Pin No. Name BUSY signal BUSY Host DIN8 8-bit parallel data + Host DIN 1 + Host STROBE pulse Output timing of the BUSY signal P s w O: Positive edge of STROBE 1: Negative edge of STROBE —...
Page 71 REV.-A is shown The 8-bit parallel interface circuit in Figure 2-28. signal and a data exchange is External data on DIN 1-8 is input at the falling edge of the STROBE the external device. sending the CPU and cause the to output either Control signals WR, RD, and ACKI are input from the...
Page 72 PA6--H:. . . PC4--H . . . 8 - b i t s e t v a l u e s . PBCl--H- PB2-”1+- PB3--ti- S T R O B E Is sent. d a t a I s l a t c h e d a n d B U S Y INT1 C P U...
Page 73 READ DATA I N I T I A L I Z E From To CPU HOST BUSY HOST VALID DATA Fig. 2-30. Interface Signal Timing Table 2-12. Relationship 8-Bit Parallel l/F Signals HOST READY/ERROR BUSY PRINTER acknowledge: Disable STROBE ON-LINE READY pulse is sent from host, then goes...
Page 74: Serial Interface
REV.-A 2.3.2.2 Serial Interface Operating Principle The two handshaking methods are as follows: status . . . (REV) signal signal is set to SPACE when the printer can accept data and is set to MARK (–V) when the printer is in an error state or when the vacant area of the input buffer reaches 256 byte or less. In this way, handshaking with the host is accomplished by setting the status to either SPACE or MARK using the...
Page 75 Circuit Description Figure 2-33 shows the serial interface circuit. Data transmitted from the host computer is converted from voltage levels by the line driver 75189 (9 B). The converted data is sent to CPU via buffer (6 B). On the contrary, data transmitted from the CPU is sent to 75188 (9A), converted from voltage levels, and is transmitted to the host computer.
Page 76 values. EBUSY--L send X-ON d a t a a r e S e n t data vacant area EBUSY--H- send X - O F F I ne a r e a Fig. 2-34. Serial Interface Circuit Operation INITIAL IZE OPERATION From EBUSY SPACE...
Page 77: Control Panel Interface Circuit
REV.-A 2.3.3 Control Panel Interface Circuit Figure 2-36 shows the main board control panel circuit. The seven switches, 15 and one buzzer The firmware periodically reads the state of the switches. The are installed on the control panel. conditions at which the switch states are read are listed in Table 2-13. If the firmware detects a value different from the previous one, the value is reloaded.
Page 78 REV.-A - - - “. — Fig. 2-36. Relationship Between MONMA Board and MONPL Board 2-36...
Page 79: Cpu Address Mapping
DATA IN LOAD INDICATES A NEW INDICATES AN OLD VALUE STAT E VALUE Fig. 2-37. Data Transfer Timing - - - DATA IN — D 10 — — J RESET 12- BIT L A T C H E S W I T H R E S E T LOAD Fig.
Page 80 Fig. 2-39. Arrays”Memories Block 2-38...
Page 82: Status Monitoring Circuits
REV.-A 2.3.5 Status Monitoring Circuits The state of each sensor and switch associated with the printer mechanism is detected by the A/D converter (ports of the CPU. The detected value (analog data) input to each port is converted to 8-bit digital data and is compared with a reference value by the firmware. The detected signals are shown in Table 2-14.
Page 83: Reference Voltage Generation Circuit
2.3.5.1 Reference Voltage Generation Circuit Figure 2-41 shows the generation circuit for reference voltage VDC) used in the A/D converter (4.75 in the CPU. This circuit employs a programmable shunt regulator 1 (CY 1 ) for the reference voltage supply. Fig.
Page 84: Temperature Monitoring Circuit
REV.-A 2.3.5.2 Temperature Monitoring Circuit Figure 2-42 is the temperature monitoring circuit. This circuit detects the temperature using a thermistor included the R 8 0 AR EF AN O Fig. 2-42. Temperature Monitoring Circuit The temperature of the rises as the high duty cycle printing continues. To prevent damage the printer operates as shown in Figure 2-43.
Page 85: Dc Line Voltage Monitoring Circuit
Table 2-15 shows the relationship between head temperature at limit values and voltages at the CPU. Table 2-15. Relationship Limit Value and Voltage Voltage at Temperature [“C] 0.82 Upper Limit 1.01 Lower Limit 2.3.5.3 DC Line Voltage Monitoring Circuit As shown in Figure 2-44, this circuit detects voltage fluctuation in the DC power supply line.
Page 86 REV.-A Table 2-16. Relationship Between Line and Line [V] Normal Lower limit 31.7 2.3.5.4 DIP Switch Read Circuit DIP switch settings are read using analog ports through 7 after the power is applied or the INIT input initializes the CPU. Figure 2-46 shows the circuit diagram. 4.75V ANKO A NK2...
Page 87 DIP switches SW 1-1 through 1-8 and SW 2-1 through 2-8 are read by selecting them using the three bank signals BANK 0,1, and 2 of the E05A1 OAA gate array ( 10C). Table 2-17 lists the BANK signals and analog ports. Table 2-17.
Page 88: Circuit
REV.-A 2.3.6 Carriage and Paper Feed Motors Control Circuit This printer employs an E05A09BA gate array 2A) to control the two stepper motors (the carriage motor and paper feed motor). This gate array can independently control the stepper motors so that the CPU load is reduced.
Page 89 REV.-A 2.3.6.1 Gate Array (2A) This gate array contains two phase switching pulse generation circuits for 4-phase stepping motors, so that two motors can be controlled separately. The timing of the phase switching, for normal rotation, reverse rotation, or stop, and the phase switching method are controlled by control signals from the CPU.
Page 90: Home Position Seek Operation
2.3.7 Carriage Motor Control Circuit The carriage motor control system in this printer employs an open-loop control system. 2.3.7.1 Home Position Seek Operation The function which moves the carriage to the home position after CPU inputs RESET signal is called home position seek.
Page 91 REV.-A HP Signal CR Motor Phase C Phase D Detects HP Signal Reads and sets the phase change point in the CPU. Fig. 2-50. Home Position Seek Phase States 2-50...
Page 92: Logic Seeking
. 11-12 Printing of the 3’rd line Fig. 2-51. logic Seeking Operation a) Upon receive in print data “EPSON” for a line from the host computer, the printing is performed in an action of with the carriage and printhead moving to position b) The CPU, receiving the next data from the host computer, analyzes it and determines the acceleration start position of the carriage.
Page 93 REV.-A 2.3.7.3 Carriage Motor Excitation System The carriage motor is controlled by the carriage motor constant current drive circuit. The phases of the carriage motor are controlled by AO l-DO 1 of the E05A09BA (2A). Two drive systems, 2-2 phase and 1-2 phase excitation, are used.
Page 94: Carriage Movement Area And Speed Control
2.3.7.4 Carriage Movement Area and Speed Control The carriage movement area is shown in Figure 2-53. The area is roughly divided into three parts: 1) speeds for the acceleration area, 2) printing area, and 3) deceleration area. There are six constant carriage movement, as shown in Table 2-20.
Page 95 REV.-A High Speed Skip Area , Constant Constant Speed Printing Character Space ) or more Fig. 2-54. High Speed Skip Control Deceleration Speed or 2, the carriage motor is decelerated for 24 pulses in the case of the 2-2 phase When the speed is 1 excitation system.
Page 96 2.3.7.5 Carriage Motor Drive Circuit This printer has STK6722H (1A) which is a stepper motor driver used to drive the carriage motor, using a constant current chopping method. Reference Voltage Generation Circuit Figure 2-55 shows the reference voltage generation circuit, and Table 2-21 shows the relationship between ports of E05A09BA (2A) and the reference voltage.
Page 97 REV.-A General Operation Figure 2-56 shows the carriage motor drive circuit block diagram. The carriage motor has four coils A, B, C, and D, and each coil is driven by the corresponding phase driver A to D. These phase drivers are switched directory by the output pulses from ports AO 1 to DO 1 of the MCU (2A).
Page 98 Detailed Operation (Figure 2-57.) When the + 5V supply voltage is applied to the STK6722H A), the triangular waveform circuit in the starts oscillation and outputs the reference signal 24 KHz) for chopper control. (point is high (input at the side input at the minus Because...
Page 99: Paper Feed Motor Control Circuit
REV.-A 2.3.7.6 Home Position Sensor The home position (HP) sensor is used for detecting the carriage home position. The details are described in below. Photo-electric conversion Detection System: Open-collector Output System: See Table 2-22. Signal Status: Table 2-22. HP Sensor Signal Status PAO (1 pin) of CPU Carriage position High...
Page 100 T r a c t o r C P U C U T S H E E T E J E C T I N G i s c o n t i n u o u s c o n t i n u o u s mode.
Page 101 REV.-A CONTINUOUS PAPER LOADING CUT SHEET LOADING M o v e t h e l - o c o l u m n s . t h e 1 5 0 and ho R o t a t e t h e r e e d m o t o r c l o c k w i s e...
Page 102 REV.-A CONTINUOUS PAPER BACK-OUT M o v e c o l u m n s . t h e motor R o t a t e r e e d motor count e r c oc kw 1 0 0 Fig.
Page 103 PAPER HOLDING LEVER CLOSE P r i n t M o v e t h e c o l u m n s . Rotate motor t h e D o w e r o D e r a t e t h e D O S t t h e n m o v e...
Page 104: Paper Feed Motor Speed Control
2.3.8.2 Paper Feed Motor Speed Control When the amount of paper to be fed is 14 steps or less (amount of paper feed step is 1/180 inch), the paper feed motor is controlled to rotate at constant speed. When the amount of paper to be fed exceeds 14 steps, the paper feed motor is accelerated and decelerated.
Page 105: Paper Feed Motor Drive Circuit
REV.-A 2.3.8.3 Paper Feed Motor Drive Circuit Figure 2-66 shows an open-loop circuit for constant voltage drive and the 2-2 phase excitation system driven by +35 V DC. through of the (2A) control the coil excitation system, and between the hold/run modes. switches P o T R 26...
Page 106: Sensor Circuits
2.3.8.4 Sensor Circuits This control circuit employs two sensor circuit. One is the paper end sensor circuit which detects the paper stays or not in printer mechanism. The other is the release/friction sensor circuit which detects the paper release lever position. Paper End (PE) Sensor Detection System: Mechanical switch...
Page 107 Release/Friction (R/F) Sensor Detection System: Mechanical switch See Table 2-26. Signal Status: Table 2-26. R/F Sensor Signal Status Paper Release Lever Position PB6 (15 pin) of CPU Forward (release) Backward (friction) High Circuit: See Figure 2-69. Fig. 2-69. F/T Sensor Circuit 2-66...
Page 108: Plunger Drive Circuit
2.3.9 Plunger Drive Circuit The CPU to open and close the paper holding controls this circuit to drive the plunger lever for paper shows the drive mechanism, Figure 2-71 shows the plunger drive auto loading/ejection. Figure 2-70 circuit and Figure 2-72 and Table 2-27 show the on/off timing of the transistors during the plunger drive and paper holding.
Page 109 3 5 - 3 5 - Plunger Plunger Distance motion from Stopping Point Paper holding lever close state plunger drive state Paper holding lever open state Plunger hold state drive state Fig. 2-72. Relationship Between Transistors and Plunger Table 2-27. Relationship Between CPU ports and Plunger Voltage Supplied power [V] (Plunger) 2-68...
Page 110: Control Circuit
REV.-A 2.3.10 Control Circuit control circuit. In this circuit, the print data is stored Figure 2-73 shows a block diagram of the in the head data control gate array E05A02LA (3A) by the CPU. The sends three sets of 8-bit data (for 24 dots), and then sends a drive pulse to drive pulse width...
Page 111 REV.-A 2.3.10.1 Gate Array Gate Array includes circuits to interface the CPU and This general purpose gate array has special commands that lighten the load on the CPU when outputting data. of data Figure 2-74 is a block diagram of the gate array.
Page 112 REV.-A Because the terminal of this gate array is activated by accessing address X H, the command output address and data output address are determined as shown in Table 2-28. Table 2-28. Gate Array Functions Function 1/0 Address Outputs a command: Bit 7: Data latch writing sequence setup O: Ascending order 1: Dscending order...
Page 113 (ED 20H ) DATA DATA DATA I H ) O 0 H (F D 2 Pr in 1 i I n i t i a l i z e # 9- Fig. 2-75. E05A02LA Initialize Sequence 2.3.10.2 Trigger Pulse Generation Circuit Figure 2-76 shows the trigger pulse generation circuit.
Page 114 COPY NORMAL MODE Pc 5 — 5 5 5 — — according to the voltage of the +35 V line. NOTES: 1. This cycle varies 2. This drive pulse width depends on the value of Fig. 2-77. Trigger Pulse Generation Circuit Waveforms Table 2-29.
Page 115 REV.-A Mode (Heed Lever Position: I-3 ) Mode ( 4 - 8 ) — 38.5 [v 1 Power Supply Limits 35 v “/0 Vo I toge DC Line C o i l D r i v e Fig. 2-78. Relationship Between Coil Drive Pulse Width and Drive Voltage 2.3.10.3...
Page 116 REV.-A 2.3.10.4 Platen Gap Sensor Circuit The platen gap (pg) sensor is used for detecting the Head adjustment lever position. The details are described in below. Mechanical Switch Detection System: See Table 2-30. Signal Status: Table 2-30. Platen Gap Sensor Signal Status PB7 (16 pin) of CPU (76) Head Adjustment Lever Position 1st to 3rd...
Page 117 REV.-A CHAPTER 3 OPTIONAL EQUIPMENTS 3.1 GENERAL ..................... 3-1 INTERFACES .
Page 118 3.1 GENERAL This chapter describes the options available for the 050. 3.2 OPTIONAL INTERFACES 050 uses the 8100 series optional interfaces. The main optional interfaces are listed in Table 3-1. Table 3-1. Optional Interfaces Description Cat. No. Function Buffer Size Standard Parallel #8 172...
Page 119 REV.-A 3 . 2 . 1 8 1 4 3 I n t e r f a c e B o a r d When the and 20 neutral current loop are in use, the printer will also support the 8143 new serial interface.
Page 120 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 switch settings. When a standard 8-bit parallel interface is used instead of the 8143 l/F board , DIP switch 1-8 should be turned off.
Page 121 REV.-A CHAPTER 4 DISASSEMBLY, ASSEMBLY, A N D ADJUSTMENT REPAIR INFORMATION ..........4- 1 D I S A S S E M B L Y A N D A S S E M B L Y .
Page 122 4.2.4.19 Paper Holding Roller Set and Paper Holding Levers L and R Removal ......4-36 4.2.4.20 Push Tractor Unit Disassembly .
Page 123 REV.-A Fig. 4-26. Transmission Gears Removal ..........4-22 Fig.
Page 124 REV.-A LIST OF TABLES Table 4-1. Repair Tools ................. 4- 1 Table 4-2.
Page 125 Electric soldering iron B740200 100 Brush No. 1 1400200 Brush No. 2 1400100 Cleaning brush 1600100 O: Commercially available product E: EPSON exclusive tool Table 4-2. Measuring Instruments Description Specification Necessary Convenient Multimeter Oscilloscope 20 MHz or more Logic analizer Table 4-3.
Page 126 Figure 4-1 shows some of the parts found on the Sheet Guide Printer Cover Release Lever Control Panel Push Tractor Roller Shaft Interface p o w e r Connector Power Cord Fig. 4-1. Parts of the...
Page 127 W A R N I N G ‘here are several precautions you should take after troubleshooting and when packing for transport: printer Slide the to the middle of the printer. While holding the paper holding roller shaft open, reattach the locking tabs to left and right of the printer mechanism. Then slide the all the way to the right, and insert the protector between the...
Page 128 REV.-A 4. Repack the printer using the original box and packing materials. 5. Also, before disassemble or checking the printer, remove the protective materials described above for packing procedures. by reversing the sequence used After printer disassembly, assembly, and adjustment, be sure to perform lubrication, adhesive application, cleaning, and maintenance as indicated in Chapter 6 to maintain optimal printer performance.
Page 129: Disassembly And Assembly
4.2 DISASSEMBLY AND ASSEMBLY by performing the disassembly operation Components of the 050 may be assembled simply been omitted. in reverse sequence. Assembly procedures, therefore, have into three parts: ( 1 ) removal of the upper The sequence of this disassembly in this section is grouped sequence (2) removal of the circuit boards, and (3) disassembly of the printer mechanism.
Page 130 REV.-A Screws, washers, nuts, etc. are abbreviated using the conventions below. Table 4-4. Abbreviations List of Small Parts Part Name Abbreviation Cross-Bind-head B-tight Cross-Bind-head S-tight Cross-Bind-head S-tight with Outside-toothed washer CBS (0) (0)) Cross-Bind-Notch-head S-tight CBNS (N)) Cross-Pan-head S-tight with Outside-toothed washer (0)) (P)) Cross-Pan-head S-tight with Plain washer...
Page 131: Upper Case Removal
4.2.1 Upper Case Removal To check the interior of this printer, first remove the upper case using the steps listed in the paragraphs below. DANGER Prior to beginning the following procedures, be sure to disconnect the power cord and interface cable, and remove the paper installed in the printer.
Page 132: Push Tractor Unit Removal
REV.-A 4 . 2 . 2 P u s h T r a c t o r U n i t R e m o v a l Remove the push tractor unit before removing the circuit boards and the printer mechanism from the lower case.
Page 133: Circuit Board Removal
4.2.3 Circuit Board Removal This printer includes two circuit boards: the controller circuit board and power supply circuit board. 4.2.3.1 Board Removal Remove the upper case (Refer to Section 4.2. 1.). Remove the push tractor unit (Refer to Section 4.2.2.). Disconnect connectors CN 17 and 18, which connect the board.
Page 134 REV.-A 7. Remove the two CBS (3 X 10) and two (3 X 10) screws securing the board. 8. Release three tabs securing the board. 9. Remove the CPB (3X 12) screw and spacer securing the board. 10. Remove the board and disconnect connector CN7 from the control panel.
Page 135 4.2.3.2 Board Removal 1. Remove the upper case (Refer to Section 4.2. 1.). 2. Remove the push tractor unit (Refer to Section 4.2.2.). 3. Disconnect connector CN 1 which connect the MONMA board and which connect the fan unit. 4. Remove the two CBS (3 X 10) and two (3 X 10)screws securing to lower case.
Page 136: F A N U N I T R E M O V A
REV.-A 4.2.3.3 Fan Unit Removal Remove the upper case (Refer to Section 4.2. 1.). Remove the push tractor unit (Refer to Section 4.2.2.). Remove the board (Refer to Section 4.2.3.2.). Remove the two (4 X 12) screws securing to lower case. Remove the fan unit.
Page 137: Printer Mechanism Disassembly
REV.-A 4.2.4 Printer Mechanism Disassembly This section describes the procedures for disassembling the main components of the printer mechanism. Figure 4-14 shows the relationship of the printer mechanism’s majour components for reference during assembly. Refer to Figures A-37 through A-44 in the Appendix during assembly.
Page 139: Printer Mechanism Removal
REV.-A 4.2.4.1 Printer Mechanism Removal 1. Remove the upper case (Refer to Section 4.2. 1.). 2. Remove the platen knob. 3. Remove the push tractor unit (Refer to Section 4.2.2.). 4. Disconnect connectors CN 12, 16, CN8, CN 14, CN 13, and CN 11 from the MONMA board (Refer to Figure 4-8.) 5.
Page 140 7. Remove the printer mechanism. 8. Remove three for the LQ-850 or four screws for the LQ-105O, (3 X 6), securing the ground plates to the base frame of the printer mechanism. Ground Plate Fig. 4-16. Ground Removal 4.2.4.2 Removal 1.
Page 141 5. Disconnect the two flexible printed cables from the connectors at the Fig. 4-18. Disconnecting ASSEMBLY POINT to the connector as shwon in Figure 4-18. — 4.2.4.3 (Flexible Printed Cable) Removal Remove the printer mechanism (Refer to Section 4.2.4. 1.). Remove the (Refer to Section 4.2.4.2.).
Page 142: Carriage Motor Removal
REV.-A 4.2.4.4 Carriage Motor Removal 1. Remove the printer mechanism (Refer to Section 4.2.4.1.). 2. Remove the carriage motor wires from the wire holder. 3. Remove the timing-belt tension spring. 4. Remove the two (0)(3 X 10) screws securing the carriage motor mounting plate to base frame via carriage motor mounting bush.
Page 143 ASSEMBLY POINT 1. Set the timing belt correctly at the drive pulley of the carriage motor. 2. Mount the carriage motor with carriage motor mounting plate and carriage motor mounting bushes on base frame by lightly tightening two CPS (0) (3 10) screws.
Page 144: Timing Belt. Belt-Driven Pulley Removal
REV.-A R e m o v a l 4.2.4.5 Timing Belt* Belt-Driven Pulley Remove the printer mechanism (Refer to Section 4.2.4.1 .). Remove the timing-belt tension spring. Loosen the two X 10) screws which fixing carriage motor mounting plate to the base frame. Pull the belt out from carriage motor pulley.
Page 145: Home Position Sensor Removal
4.2.4.6 Home Position Sensor Removal 1. Remove the printer mechanism (Refer to Section 4.2.4.1.). 2. Press the two tabs of the home position sensor on the bottom of the base frame. 3. Remove the home position sensor. 4. Disconnect the connector from the home position sensor. Home Position Connector (b) Top View...
Page 146 4.2.4.7 Paper Feed Motor* Transmission Gears Removal 1. Remove the printer mechanism (Refer to Section 4.2.4.1 .). 2. Remove the two (3 X 6) screws. 3. Remove the paper feed motor. Motor Feed Fig. 4-25. Paper Feed Motor Removal 4. Remove the tractor transmission gear spring. 5.
Page 147: Platen Gap Sensor Removal
4.2.4.8 Platen Gap Sensor Removal Remove the printer mechanism (Refer to Section 4.2.4.1.). 2. Position the head adjustment lever at a setting between the 4th and 8th positions. 3. Remove the (3 X 10) screw securing the platen gap sensor to the side frame L, remove then the sensor.
Page 148: Friction/Tractor Sensor Removal
REV.-A 4.2.4.9 Friction/Tractor Sensor Removal Remove the printer mechanism (Refer to Section 4.2.4. 1.). at the its Position the paper release lever back setting. Remove the paper feed motor (Refer to Section 4.2.4.7). sensor to the side frame R, then Remove the (3 X 10) screw securing the friction/tractor remove the sensor.
Page 149: Plunger Removal
REV.-A 4.2.4.10 Plunger Removal 1. Remove the RE (3), and disconnect loading lever of the plunger from the paper holding lever L. 2. Remove two (0) (3 X 6) screws, which secure the plunger to the side frame L, then remove the plunger.
Page 150: Platen Unit Removal
REV.-A 4.2.4.11 Platen Unit Removal 1. Remove the upper case (Refer to Section 4.2. l.). 2. Remove the two (3 X 6) screws securing the platen cover to side frames L and R, then remove the platen cover. Shaft Holder Paper Holding Roller Shaft (3 X 6 ) Fig.
Page 151: Paper Release Lever Removal
4.2.4.12 Paper Release Lever Removal Remove the printer mechanism (Refer to Section 4.2.4.1.). 2. Remove the paper feed motor and transmission gears (Refer to Section 4.2.4.7.). 3. Remove the platen unit (Refer to Section 4.2.4.1 1.). 4. Press the paper release lever tab at the inside of the side frame R, then remove the lever. Paper Release Lever Fig.
Page 152: Printer Mechanism Disassembly
REV.-A 4.2.4.13 Printer Mechanism Disassembly 1. Remove the printer mechanism (Refer to Section 4.2.4.1.). 2. Remove the printhead (Refer to Section 4.2.4.2.). 3. Remove the carriage motor (Refer to Section 4.2.4.4.). 4. Remove the belt-driven pulley (Refer to Section 4.2.4.5.). 5.
Page 153 REV.-A 9. Remove two (0) (3 10) screws securing both R to the base frame. side frames Frame L Frame — Fig. 4-36. Screws Removal 10. Detach the hooks on the main unit from the base frame, and pull the main unit up. Fig.
Page 154 REV.-A Fig. 4-38. Main Frame Unit Ribbon Driver Unit Fig. 4-39. Base Frame Unit ASSEMBLY POINT When fitting the main frame to the base frame, hook the eight tabs into the holes in the base frame, and pull it forward. ADJUSTMENTS REQUIRED The following adjustments are required to reassemble the printer mechanism: 4.3.2 Paper Feed Motor Backlash Adjustment...
Page 155 4.2.4.14 Ribbon Unit Removal Remove the printer mechanism (Refer to Section 4.2.4. l.). 2. Separate the main and base units (Refer to Section 4.2.4.1 3.). 3. Press the six tabs for the ribbon driver unit at the bottom of the base frame, and remove it. Fig.
Page 156: Carriage Removal
REV.-A 4.2.4.15 Carriage Removal 1. Remove the printer mechanism (Refer to Section 4.2.4.1.). 2. Separate the main and the base units (Refer to Section 4.3.4. 12.). 3. Remove the RE (3) securing the loading lever of the plunger to paper holding lever L. 4.
Page 157 REV.-A Side Frame R Side Carriage’ Guide Shaft A Guide Shaft B Fig. 4-42. Carriage Guide Shafts A-and B Removal 7. Pull the carriage out from the carriage guide shafts A and B. ASSEMBLY POINTS While passing the carriage guide shaft B through the carriage, fit the felt to the bottom of the carriage.
Page 158: Paper Guide Plate Removal
REV.-A 4.2.4.16 Paper Guide Plate Removal 1. Remove the printer mechanism (Refer to Section 4.2.3. 1.). 2. Separate the main and base units (Refer to Section 4.2.4.1 2.). 3. For the remove the two paper guide plate springs or for the LQ-1 050 remove three paper guide plate springs with the mechanism status.
Page 159: Paper Feed Roller Unit Removal
4.2.4.17 Paper Feed Roller Unit Removal Remove the printer mechanism (Refer to Section 4.2.3.1 .). 2. Separate the main and base units (Refer to Section 4.2.4.1 2.). 3. Remove three paper feed springs for the or four for 050 from the hook on the base frame.
Page 160 REV.-A 4.2.4.19 Paper Holding Roller Set and Paper Holding Levers L and R Removal Remove RE (3) at the outside of the paper holding lever R on the paper holding roller set. 2. Remove the right and left sides of the paper holding roller shaft from the paper holding levers. 3.
Page 161 REV.-A 4.2.4.20 Push Tractor Unit Disassembly This section describes the removal of the tractor assembly (left). Since disassembled parts can be reassembled by using the removal procedures in reverse assembly procedures have been omitted. shaft holder from the tractor mounting plate L. Remove the (0) (3 X 6) screw securing tractor mounting plate L to the tractor base frame.
Page 162 REV.-A 4.2.4.21 Paper Tension Unit Disassembly This section describes the removal of the paper tension roller assembly. Since disassembled parts can be reassembled by using these procedures in reverse order, the assembly procedures have been omitted. 1. Remove the RE (4) on the paper tension roller shaft at the inside of the paper tension frame R. 2.
Page 163 REV.-A 4.3 ADJUSTMENT This section describes the adjustment procedures required when reassembling this printer. When disassembly or replacement is performed during maintenance or repaires “of the parts described in this section, the following adjustments should be performed to ensure proper operation. 4.3.1 Platen Gap Adjustment Adjust the gap between the platen and the when carriage guide shaft B is rotated or removed.
Page 164 REV.-A Gauge Countersink Small Carriage Shaft B Fig. 4-55. Platen Gap Adjustment — Set the head adjustment lever at the 2nd position. Push the paper release lever all the way back. Gap value: 0.45 0.05 mm Adjust the platen gap using a thickness gauge while rotating carriage guide shaft B in the direction of the arrow in Figure 4-56.
Page 165 REV.-A 14. Hold carriage guide shaft B in place and tighten the HNO (4) nut. 15. Move the carriage to the left end, and measure the gap value again to confirm that it is correct. 16. Move the carriage to the right end, and measure the gap value again to confirm that it is correct. 17.
Page 166 4.3.2 Paper Feed Motor Gear Backlash Adjustment This adjustment is required either when the paper feed motor is replaced or when its mounting position is shifted. 1. Remove the printer mechanism (Refer to Section 4.2.4.1 .). 2. Loosen the two (3 X 6) screws on the paper feed motor.
Page 167 REV.-A 4.3.3 Electric Board Adjustment This section describes the board adjustment. If replace the board or printer mechanism, perform the adjustment in below. 4.3.3.1 Bidirectional Value Adjustment If printing is misaligned in during bidirectional printing, align the printer by adjusting board, according to the alignment sequence flowchart shown Figures 4-59 and 4-60 (Refer to Figure 4-61 for the positions of the switches and...
Page 168 Remove c o v e r cover. Loaa the T u r n t h e CONDENSED VR2 or VR3? FORM-FEED. nt i t on. i n t c h a r a c t e r a t e a c h A I I I nt I t I on.
Page 169 FORM-FEED. s e l e c t adjustment or enter mode (ON-LINE)? ON-L I NE. Inter. P r i n t c h a r a c t e r t h r e e nt character . three nes” at mode-3, mode-5.
Page 170 REV.-A Printing Position Alignment Check Figure 4-62 shows three lines of test printing with characters “l”. Using this printout, check the following: Odd Line ... . Reference Even Line ... Move mode=O Fig.
Page 171 CHAPTER 5 TROUBLESHOOTING GENERAL ....................5- 1 5.1.1 Diagnostic Tools .
Page 172 REV.-A LIST OF TABLES Table 5-1. Troubleshooting Tools ............5- 2 Printer Diagnostic System .
Page 173: General
5.1 GENERAL can occur, troubleshooting is not easy to perform. Here, a simple Because various types of trouble troubleshooting, as shown in Figure 5-1. procedure is provided to perform 5. I 5 - 3 Fault check using the Unit Replacement tool 5.3.
Page 174 REV.-A Table 5-1. Troubleshooting Tools Part No. Item Description Tool No. 108801 Use together with EPSON PC (EQUITY) series Diagnostic Tool 108901 Use together with EPSON QX-16 105401 Between board and paper end E594 Cable sensor Between board 10) and platen gap...
Page 175: Diagnostic Tools
5.1.1 Diagnostic Tools The diagnostic tools enable anyone to troubleshoot the electric components, regardless of their experience. 5.1.1.1 System Outline (EPSON QX16 or PC (EQUITY), etc.) This system is connected to an MS-DOS-based computer using an RS-232C cable. First, install the diagnostic cartridge in the printer and run the diagnostic program with the computer.
Page 176: Unit Replacement
REV.-A 5.2 UNIT REPLACEMENT The unit replacement is based on system analysis. According to the particular symptom found by the multi meter, the units listed in Table 5-3 need to be replaced. Table 5-3. Unit Replacement Numbers Unit No. Description Unit Name X50206 1060 120V 3.
Page 177 1. Printer does not operate with power switch ON (power does not bright.) correct voltage. In put Replace the ON again. is the new fuse also Measure the output voltage f r o m b o a r d . Replace the board.
Page 178 REV.-A 2. The carriage does not operate correctly. CN9. CN 13. CN 14, connecting board and printer mechanism, inserted Secure connectors. Replace the printer mechanism. Replace the board.
Page 179 normally, but the self-test printing 3. The carriage operate perform self-test. bard p r i n t e r dot “missing? them Refer tire-. coil bored.
Page 180 4. The self-test printing is normal, but the paper is not fed properly. paper correctly. Set the platen knob rotate smoothly when turned Replace the MONMA board. Replace battery. Replace the printer...
Page 181 5. The control panel does not operate correctly. control pane etween the board Reinsert connector CN7 correctly. Replace the board. Replace the control panel. Replace the board.
Page 182 6. The printing is incorrect in the ON-LINE mode. NOTE: It is assumed that the host computer operates normally. Perform test printing. to other troubleshooting Confirm the transmission conditions of the printer and the host computer. Replace the MONMA board. 5-1o...
Page 183 5-5. MONPS Board Environmental Condition (Reference Value) Output Voltage [V] Power Supply Line 35.4 35.5 35.5 + 3 5 - G + 1 2 - – 9 . 9 – 10.0 – 10.0 – 1 2 - + 5 - NOTES: 1.
Page 184: Unit Repair
REV.-A 5.3 UNIT REPAIR Unit repair is divided into three parts: (1) The board; (2) The board; (3) The Printer mechanism. This section will describe (1), the board unit repair. If (2) board or (3) Printer mechanism should need repair, use the diagnostic tool introduced in Section 5.1.1. 5.3.1 Board The power supply circuit...
Page 185 Table 5-7. MONPS/MONPSE Board Unit Repair Solution Cause Checkpoint Symptom Replace line is dead. malfunction Refer to the checkpoint list for the +35 V line is dead. +35 V line. +35 V line is Check the input voltage waveform Check whether the Input filter circuit input filter circuit dead.
Page 187 REV.-A Fig. 5-6. MONPS/MONPSE Board Voltage Waveforms 5-14...
Page 188 5-16...
Page 189 5-17...
Page 190 REV.-A Table 5-8. MONPS/MONPSE Board Main Parts List MONPSE Board MONPS Board Location Description Name Description Name ~D20,zD21 HZ 20-3TD 2 0 . 2 - 2 1 . 1 v 2SA 10 15-TPE2 150mA 2SC4313 15A, 130W 2SC4059 2SC3303Y 80V, I Shunt Regulator TLP52 1-1 GB TLP732GB...
Page 191 5.3.2 Board board can be repaired using the diagnostic tool. Table 5-9 lists the main parts of the board. Table 5-9. Board Main Parts List Description Name Location Hex inverters with open-collector output Hex buffer with open-collector output Quad line drivers 188N Quad line receivers 189N...
Page 192: Model-531 0/5360 Printer Mechanism
REV.-A 5 . 3 . 3 M o d e l - 5 3 1 0 / 5 3 6 0 P r i n t e r M e c h a n i s m Use the diagnostic tool to detect malfunctions among the carriage motor, paper feed motor, sensor and plunger.
Page 193 REV.-A CHAPTER 6 MAINTENANCE 6.1 PREVENTIVE MAINTENANCE ............. .6-1 6.2 LUBRICATION AND ADHESIVE APPLICATION .
Page 194 EPSON recommends that the points illustrated in Figure 6-2 be lubricated according to the schedule listed in Table 6-2, with EPSON O-2 and G-27, which have been extensively tested and found to comply with—the need of this printer (Refer to Table 6-1 for details and G-27.).
Page 195 Table 6-3. Adhesive Application Point (Refer to Figure 6-2.) Number of point Adhesive Application Point Ref. No. Engaging parts between timing belt and carriage (11) Fig. 6-1. (LQ-105O) Lubrication Points Diagram...
Page 196 REV.-A Fig. 6-1. (LQ-105O) Lubrication Application Points Diagram (Cont.)
Page 197 REV.-A Carriage Position Neji Lock #2 (b) Bottom View Fig. 6-2. Adhesive Application Point...
Page 198 APPENDIX ................A- PPD781OHG CPU (76) .
Page 199 LIST OF FIGURES OHG Pin Diagram ............A- 1 Fig.
Page 200 REV.-A Fig. A-36. MONMA Board Circuit Diagram ......... . A-47 Exploded Diagram .
Page 201 REV.-A Table A-24. CN13 Pin Assignments ............A-38 Pin Assignments .
Page 202 REV.-A DESCRIPTIONS This section describes the primary used in the 1050, and supplements the data provided in Chapter 2. CPU (7B) 10HG is an 8-bit CPU and includes two 8-bit an 8-bit A/D converter, 256 bytes of RAM, and a serial interface. The main features of this are as follows.
Page 203 Fig. A-2. KPD781OHG Block Diagram...
Page 204 Table A-1 lists the terminal functions of the Table A-1. OHG Terminal Function Status Description Pin No, Signal Dir. HOME/OUT Carriage home position signal STAY/OUT Paper end signal ACT/NON drive PA 2 Buzzer O N / ~ NON/ACT PA 4 drive PA 5 l/F Parallel/Serial signal...
Page 205 Table A-1. I.LPD781OHG Terminal Function (cont.) Status Dir. Description Pin No. Signal — + 35V AN 1 line monitoring O F F / ~ DIP SW 1-5 read AN 2 O F F / ~ DIP SW 1-6 read AN 3 1-3, 1-8, 2-2, 2-6 read O F F / ~ AN 4...
Page 206 CPU Timing (Figures A-3 through A-5) Three oscillations define one state. The OP code fetch requires four states: during T1 to program memory is read; instructions are interpreted during Address bus 15 - 8 are output from Address bus 7 - 0 O) are used mode;...
Page 207 REV.-A ( 1 O C ) Gate Array The gate array is a memory management unit which contains reset circuit, address latch, memory management unit, and so on. CAR2 MMIO DISC THLD PORT2 Fig. A-6. Pin Diagram...
Page 208 A L E 7 - o MAN AGEMENT CONTROL PANEL P O RT 0-.2 M M IO O DATA M M IO 2 M M 1 0 3 EXTER MEMORY 1/32 COUNT P Roe ‘ N” B A N K S * O C A R C A R 2 ROUT...
Page 209 Table A-2. E05A1 OAA Terminal Function Function Name Dir. Pin No. Bank select O Bank select 1 Bank select 2 Bank select 3 Bank select 4 Bank select 5 AD O Address bus O AD 1 Address bus 1 AD 2 Address bus 2 AD 3 Address bus 3...
Page 210 REV.-A Table A-2. EO5A1OAA Terminal Function (cont.) Function Dir. Pin. No. Signal 4A select 6A select (correspond to CSBCO CSBEO 6A and 8A select (correspond to CSBFO Read strobe Write strobe 7A select 9A and select — KANJ BANK ONLSW(CN7) Address latch enable 33,64 + 5V DC power...
Page 211 Gate Array (2A) The gate array is 4 phases stepper motors control which contains two motor’s phase excitation control circuit. POT 2 co I POT O POT I AO I PO T3 AD O D 0 2 C 0 2 AD 2 B 0 2 AD 3...
Page 212 Table A-3. E05A09BA Terminal Function Description Pin No. Name Dir. Address bus O AD 1 Address bus 1 Address bus Address bus 3 Carriage motor clock pulse TM 1 Paper feed motor clock pulse pulse pulse Paper feed motor RUN/HOLD Paper feed motor phase A Paper feed motor phase C Paper feed motor phase B...
Page 213 REV.-A A.1.4 Gate Array (3A) This gate array is used to simplify the interface between the CPU and the printhead. Fig. A-10. Fig. A-1 1. Block Diagram Diagram...
Page 214 REV.-A Table A-4. E05A02LA Terminal Function Function Pin No. Signal Head Data 1 - 8 output — Write enable Address bit O Chip enable Head Data 9 - 16 output — DATA/COMMAND INPUT - 2 9 RESET Head Driving Pulse width READY REDY —...
Page 215 8-Bit Parallel VF (5A) contains 8-bit parallel interface function so that the interface between host computer and CPU is simplify. 4 2 — V c c — — B 0 3 — 3 9 — 3 a — 3 7 — E B SY 3 6 —...
Page 216 “H” “H” ‘RR 34 ‘R ‘RR 33 60 . Fig. A-1 3. M5461OP Internal Circuit A-1 5...
Page 217 Table A-5. M5461OP Terminal Function Function Name Direction Pin No. BUSY signal Host BUSY DIN8 8-parallel data DIN 1 Host STROBE pulse Output timing of the BUSY signal O: Positive edge of STROBE 1: Negative edge of STROBE 6,21,35 8-bit parallel data READ pulse WRITE pulse Chip select signal...
Page 218 A.1.6 4-Phases Stepper Motor Driver (1A) for the four phases stepper motor. is a constant current chopper driver 2 3456 - - - - - - - - 18 — Fig. A-14. Pin Diagram - - - - - - - - - - - - - - - - 1 “...
Page 219 Table A-6. STK6722H Terminal Function Function Pin No. Signal + 35V DC power phases A and B common Surge voltage of CR motor coils CR motor phase A drive CR motor phase A drive pulse CR motor phase B drive pulse CR motor phase B drive Reference voltage for CR motor phases DC (internal circuit power)
Page 220 ( 9 A ) This is a ultra-violet erasable and electrically programmable ROM of 32 K-bytes. Features Capacity of 32768 words X 8 bits compatible with TTL Power supply Access 250 ns time 28 pins (DIP) Terminal Functions AO - Al 4 Input address Chip enable Output enable...
Page 221 REV.-A Table A-7. HM65256 EP-ROM Signal Status outputs Mode D out High Z Output Disable High Z Standby High Performance Program Program Verify D out D out Optional Verify Program Inhibit High Z Identifier Code NOTES: 1. X . . . Don’t care 2.
Page 222 CMOS PSEUDO ST-RAM (7A) which has low power consumption, and its input/output level is This is a 8K-byte CMOS static RAM compatible with the Features Capacity of 32768 words X 8 bits 1/0 with compatible . Power supply access time . . . 120ns 28 pins (DIP) 1/07 Functions...
Page 223 REV.-A H M 6 2 6 4 A L S P - 1 2 C M O S S T - R A M ( 8 A ) This is a 8K-byte CMOS static RAM which has low power consumption, and its input/output level is compatible with the Features Capacity of 8192 words X 8 bits...
Page 224 Table A-9. HM6264ALSP-12 Signal Status Terminal Mode Power down High Z High Z Output disable Read cycle Data out Write cycle (1) Data in Write cycle (2) Data in A-23...
Page 225 REV.-A A.1.1O SN75188N Line Driver (1OA) The 75188 is a quad line driver which is used for exchanging the signal level from with the 75189. INPUT A 2 INPUT OUTPUT A 3 12 INPUT INPUT 11 OUTPUT D INPUT OUTPUT 9 INPUT Fig.
Page 226 REV.-A General Purpose Timer (7C) The 555 is a one circuit general purpose timer, which can be used to construct a timing generator circuit such as a one-shot/multi oscillator using a few external parts. Features . Wide timing range to hours) timing circuits can be constructed .
Page 227 REV.-A Inverter with Open-Collector Output (4B) This has hex open-collector invertors. Fig. A-26. Pin Diagram Dutter with Open-Collector Output (6B) This has hex open-collector buffers. Fig. A-27. Pin Diagram A-26...
Page 228 Shunt Regulator Board, Q5.Q20..MONPS/MONPSE Board) high accuracy temperature compensated shunt regulator. The output voltage can be The TL431 is a changed between 2.5 to by adding two external resistors. The 1 has high stability and outputs a large current so that it can replace various diodes.
Page 229 REV.-A A.1.16 Chopper-Type Switching Regulator is a chopper type switching regulator which obtains a stable output voltage of Fig. A-29. Pin Diagram TR I : R3 — ‘ VOLTAGE ‘c’ Fig. A-30. Equivalent Circuit Table A-1 1. Specification Maximum Rating Electric Characteristic ToP [“C] Ripple Atteneter [dB]...
Page 230 PIN ASSIGNMENTS CONNECTOR connector pin assignments in the electric circuit boards. Thes section describes the MONMA Board To connect the printer to the host computer. Use: Number of Pins: 36 Table A-1 2. Pin Assignments Return Signal Description Dir. Signal Pin No.
Page 231 Table A-12. CN1 Pin Assignments (Cont.) Signal Return Dir. Description Signal Pin No. Pin No. ERROR The level of this signal becomes “LOW” when the printer is in: — 1. PAPER END state 2. OFF-LINE state 3. Error state — Same as with Pin No.
Page 232 A.2.1.2 board. data between Use: Number of pins: 26 Pin Assignments Table A-1 3. Description Dir. Pin No. Signal Error ERROR Paper end Data bit 6 D6 (B4) BUSY (READY) BUSY Data bit 5 D5 (B3) Acknowledge ACKNLG Data bit 4 (Parity disable) Initialize I NIT Data bit 3 (Odd/Even parity select)
Page 233 REV.-A A.2.1.3 To connect the printer to the host computer which has the RS-232C interface. Use: Number of pins: 6 Table A-14. Pin Assignments Pin No. Signal Dir. Description Transmit data for X-ON/X-OFF handshake. DTR (REV) Indicates whether data input is ready or not. When data input is inhibited, Receive data —...
Page 234 A.2.1.4 (Contained only JAPAN) M O N M A board. To exchange data between the EMKG board and the Use: Number of pins: 44 Table A-1 5. Pin Assignments Description Pin No. Signal Dir. Al 2 Address bus 12 bus 7 Address Address Address...
Page 235 Table A-1 5. CN4 Pin Assignments (Cont.) Description Dir. Pin No. Signal + 5V DC power — Bank 4 — Not connected Bank 1 KANJI Address latch enable select select Write pulse Reset signal A-34...
Page 236 Interface with optional cartridge Use: Number of pins: Pin Assignments Table A-16. Description Dir. Pin No. Signal Data bus 5 Data bus 4 Data bus 7 Bank 1 AB 1 Address bus 5 Address bus 6 Address bus 10 A lO Reset signal —...
Page 237 REV.-A Interface with optional cartridge Use: Number of pins: 32 Table A-1 7. Pin Assignments Description Dir. Pin No. Signal Data Data bus 4 Data bus 7 AB 1 Bank 1 Address Address Reset signal — Address bus 9 Address bus 8 Data bus 2 Data Read...
Page 238 REV.-A Control panel interface Use: Number of pins: 12 Pin Assignments Table A-1 8. Description Signal Dir. Pin No. Switches status select O SB 1 Switches status select 1 Read switches status Read switches status Buzzer BUZZER RYLED READY LED PELED PAPER OUT LED ON LINE LED ~/off...
Page 239 REV.-A Detect paper thickness lever position Use: Number of pins: 2 Table A-21. Pin Assignments Description Signal Dir. Pin No. Head adjustment lever position ~/4-8 GAPSW — A.2.1.11 Friction or tractor feed Use: Number of pins: 2 Table A-22. Pin Assignments Description Dir.
Page 240 Carriage motor drive Use: Number of pins: Pin Assignments -Description Signal Dir. Pin No. Phase A drive pulse Phase B drive pulse Phase C drive pulse Phase D drive pulse Common phases A and B COMAB Common phases C and D —...
Page 241 REV.-A Printhead solenoids drive Use: Number of pins: 15 Table A-27. Pin Assignments Function Pin No. Name Dir. Drive pin 6 HD14 Drive pin 14 Drive pin 10 HD 10 Drive pin 23 HD18 Drive pin 18 Drive pin 15 HD 15 Drive pin 22 Drive pin 7...
Page 242 Back power is supplied Use: up battery Number of pins: 2 Table A-30. Pin Assignments Function Pin No. Nama Dir. BATT Battery + side — MONPS/MONPSE Board MONMA board. Use: Send various powers Number of pins: 10 Table A-31. Pin Assignments Function Pin No.
Page 243 A.2.3 EXPLODED DIAGRAMS AND SCHEMATICS Fig. A-31. MONPS Board Component Layout A-42...
Page 244 REV.-A Fig. A-34. MONPS Board Circuit Diagram A-45...
Page 245 L – – – – J Fig. A-35. MONPSE Board Circuit Diagram...
Page 246 REV.-A Fig. A-32. MONPSE Board Component Layout A-43...
Page 247 ‘m’ ’ ’ - 6 6 Fig. A-33. MONMA Board Layout A-44...
Page 248 REV.-A Fig. A-32. MONPSE Board Componant Layout A-43...

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