Epson LX-86TM- User Manual

REV.-A TABLE OF CONTENTS CHAPTER GENERAL DESCRIPTION CHAPTER 2. OPERATING PRINCIPLES CHAPTER 3. O P T I O N A L E Q U I P M E N T CHAPTER 4. DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT CHAPTER 5. T R O U B L E S H O O T I N G CHAPTER 6. M A I N T E N A N C E A P P E N D I X vi -

1.2 1.3 1.4 1.5 CHAPTER 1 GENERAL DESCRIPTION FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 INTERFACE . . . . . . . . . . . . . . . . . . ....

Fig. 1-12. Filter Unit Version) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19 Fig. 1-13. Filter Unit Versions) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20 Fig. 1-14. ROCX Board Unit . . . . . . . . . . . . . . . . . . . . . . ...

REV.-B F E A T U R E S The LX-800 is a multifunctional and high speed serial dot impact printer with a compact body and the low price. Features include: ● ● ● ● ● ● ● ● ● ● 180 maximum speed (draft-elite), 150 (draft-pica) Upward compatibility with the LX-86 Built in two fonts (Roman and Saris-serif...

REV.-B 1.4 OPERATING CONTROLS This section describes the operating controls of LX-800 printer. D I P S w i t c h a n d J u m p e r S e t t i n g s The DIP switches that users can set are SW1 and SW2. These switches are positioned at the rear center of the printer and have the functions shown in Tabl...

REV.-B 1 . 5 M A I N C O M P O N E N T S The LX-800 consists of the following components: ● Printer Mechanism (include the Tractor Unit) ● ROC Filter Unit ● ROCX Board Unit ● Board Unit ● Housing 1 . 5 . 1 P r i n t e r M e c h a n i s m The printer mechanism was developed expressly for use with LX-...

REV.-A 1 . 5 . 2 F i l t e r U n i t The filter unit contains a power cord ( 120 V version) or AC inlet (220/240 V version), power switch, fuse, filter circuit, and power transformer. Fig. 1-12. Filter Unit (120V version) Fig. 1-13. Filter Unit (220 versions) 1-19

2.1 2.2 2.3 2 . 4 CHAPTER 2 OPERATING PRINCIPLES GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 CABLE CON . . . . . . . . . . . . . . . . ....

REV.-A 2 . 5 Fig. Fig. Fig. Fig. 2.4.8 Print Timing Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 - 3 4 2.4.8.1 Print Timing Control for the Carriage and Printhead . . . . . . . . . . . . . . . . . . . . ....

REV.-A Fig. 2-24. Paper End Detection Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-28 Fig. 2-25. Phase Switching Basic Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29 Fig. 2-...

REV.-B 2.2 CABLE CONNECTIONS Figure 2-1 shows the interconnection of the primary components, with the main board at the center. I M O D E L - 3 A 1 O P R I N T E R M E C H A N I S M I O N J CR PRINT PAPER H O M E HEAD END P o s h I I c z L 1 BOARD c z ( M A I N B O A R D ) ROCK FILTER UNIT z AC120V ...

2.3 POWER SUPPLY CIRCUIT This section describes the operation of the filter unit circuit on the board. Figure 2-2 shows the block diagram of the power supply circuit. Table 2-1 shows output voltages and their applications. - -— - _ - _ . - - - - - - - - - - — - - - - - - - - - I Power F i l t e r Ci...

2.3.2.1 Operation Principles of Chopper Type Switching Regulator The operating principle of the switching regulator is illustrated in Figures 2-6 and 2-7. “ S t Fig. 2-6 Chopper Switching Regulator Circuit V/I 1 L V i - 1P + 1 c = to = L Fig. 2-7 Voltage Waveforms When switching transistor St is on,...

REV.-A When the printer power is turned on, ZD1 on the +20 line turns on, turns on, and Vcc is applied to 494. Then the oscillator starts generating an approximately 20 kHz sawtooth waveform, which is regulated by R40 and C20, and the reference voltage generator outputs the +5 10% reference voltage....

REV.-A PESENSOR PAPER MOTOR CARRIAGE MOTOR HOME PRINT HEAD I I E 0 5 A 0 3 B A I l l I l l . Fig. 2-11. Control Circuit H O S T C O M P U T E R ( O P T I O N A L Fig. 2-11. Control Circuit Block 2-1o BOARD) Diagram 1 Block Diagram

2 . 4 . 2 G a t e A r r a y F u n c t i o n s This section describes the functions. Figure 2-12 shows the block diagram. STROBE I D B O - 7 ALE RESET A M 4 REGISTER LATCH I I I 1 A 1 - I I I I I l-l I II L PRINTHEAD DRIVER CARRIAGE MOTOR DRIVER BUSY RESO Fig. 2-12. Block Diagram 2-14

REV.-A 2.4.3.1 Initialization When the reset signal is input, the printer is initialized as follows: CPU GATE .— ———————— . . 1 i I Clears the ports using hardware resetting. I Clears all port outputs. Executes the program from ● Sets the print head data to High-Z(the high address OH. I 1 impedance ...

REV.-A 2.4.3.2 Print Data Processing After the initialization, the CPU enters the data waiting state. When data is input from the interface, the CPU starts reading the data. Besides this process (main routine), the actual printing process is performed by an interrupt routine. The print data is proce...

REV.-A 2.4.4 Reset Circuit A reset operation is performed when the signal is input from the interface and when the printer power is turned on. (Refer to Sections 1.4.6, 2.4.1, 2.4.2, and 2.4.3.1 for the reset operation.) Figure 2-17 shows the reset circuit. (3B) 4 7 0 p II ~ - - - - AND II II + 5 + ...

REV.-A 2.4.5.3 Home Position Seek Figure 2-21 shows the home position seek operation (actual carriage movement) Held for 20 to 30 ms according to the phase data combination. I N 1 Moves from right to left for four steps, then stops. Moves from left to right for four steps, then stops. Moves from rig...

REV.-A 2.4.6.2 Paper Feed Motor Control The paper feed motor is controlled by an open-loop system just like the carriage motor. The basic phase switching speed is 480 PPS (2-2 phase drive), and the phase switching is performed according to the phase pattern stored in the firmware. Figure 2-25 shows ...

REV.-B Figure 2-26 shows the basic sequence for the paper feed motor. ● When the printer power is turned on, the paper feed motor is rushed for 30 to 60 ms in any phase. It takes 25 ms for the paper feed motor to restart from the stop mode. And after that, the paper feed motor rotates both back and ...

REV.-A 2.5 P R I N T E R M E C H A N I S M O P E R A T I O N The printer mechanism includes sensors, the carriage, the paper and the ribbon feed mechanism. Figure 2-36 shows an external view of the printer mechanism. Fig. 2-36. Printer Mechanism External View 2.5.1 Sensor Mechanism This subsection d...

REV.-B 2 . 5 . 2 C a r r i a g e M e c h a n i s m The carriage mechanism includes the the carriage, the timing belt, the carriage motor, and the platen. Fig. 2-37 shows the carriage mechanism. The timing belt is connected into the bottom of the carriage. This belt is driven by the carriage motor an...

REV.-B 2 . 5 . 3 P a p e r F e e d M e c h a n i s m The paper feed mechanism operates by friction feed method for cut sheets, and roll paper, and by the sprocket feed method for fanfold paper. 2.5.3.1 Friction Feed Operation The paper is held against the platen by two paper feed rollers and by the ...

REV.-B 2 . 5 . 4 F e e d M e c h a n i s m The ribbon feed mechanism consists of the ribbon cartridge and the ribbon feed driving turns counterclockwise, via the shown in Table 2-6, direction of the timing belt. Table 2-6 Ribbon Feed Gear Train section. A ribbon irrespective of the Direction of Move...

REV.-A 3.1 GENERAL This chapter describes the options available for the LX-800. 3.2 OPTIONAL INTERFACES The LX-800 use the 8100 series optional interfaces. The optional interfaces are listed in Table 3-1. Table 3-1. Optional Interfaces Cat No. Description RS-232C Buffer Size Flag Control X-ON/OFF Ma...

LIST OF FIGURES Fig. 4-1 Fig. 4-2. Fig. 4-3. Fig. 44. Fig. 4-5. Fig. 4-6. Fig. 4-7. Fig. 4-8. Fig. 4-9. Fig. 4-10. Fig. 4-11. Fig. 4-12. Fig. 4-13. Fig. 4-14. Fig. 4-15. Fig. 4-16. Fig. 4-17. Fig. 4-18. Fig. 4-20. Fig. 4-21. Fig. 4-23. Fig. 4-24. Fig. 4-25. Fig. 4-26. Fig. 4-27. Fig. 4-28. Fig. 4-29...

REV.-B 4.1 GENERAL REPAIR INFORMATION This chapter describes the disassembly, assembly, and adjustment procedures for replacing any of the main components of the LX-800. DANGER ● Prior to beginning the disassembly, assembly, and adjustment procedures, be sure to disconnect the AC power cord. ● When ...

4 . 2 D I S A S S E M B L Y A N D A S S E M B L Y This chapter describes disassembly of the LX-800. Assembly can be performed by simply reversing the order of disassembly, with special notes for assembly mentioned as “ASSEMBLY POINTS.” For assembly and disassembly procedures which require adjustment...

REV.-A 4.2.2 Removal of Cases This section describes the upper case and control panel removal. 4.2.2.1 Upper Case Removal (Figures 4-2 through 4-3) 2. 3. Remove the sheet guide unit, printer cover, tractor unit, and paper guide. Insert a standard screwdriver into the two holes at the front of the lo...

REV.-A 3. Remove the five screws securing the filter unit to the base plate. The screws are as follows: 1 X X 8) 1 X C. T. B.S.(O) X 8) 2 X 1 X C. T. P.S.(O) 6) 4. Remove the filter unit (including the AC cable (120 V), AC inlet (220/240 V), and power switch). 4.2.4 Removal of Printer Mechanism This...

REV.-A 4. Push the paper feed roller shaft down, slide it approximately 2 cm to the left, and lift it to remove it. Frame Fig. 4-13. Removal of Paper Feed Roller Shaft 5. Loosen the four tabs securing the paper guide plate and the paper guide plate spacer to the frame, using a screwdriver, and lift ...

ASSEMBLING POINTS: 1. When reassembling the paper guide plate and the paper guide spacer, refer to Figure 4-15 for the mounting direction. I . \ \ G u i d e P l a t e F o r w a r d + - The side containing the cutout is the right side. (Viewed from front of Printer Mechanism) Fig. 4-15. Paper Guide P...

REV.-A 4.2.5.2 Removal of Paper Feed Motor (Figure 4-17) 1. Remove the printer mechanism. (Refer to Section 4.2.4) 2. Disconnect the motor cable from the paper feed motor. 3. Loosen the tab of the frame, which secures the paper feed motor to the frame, by pushing it using a screwdriver, and remove t...

4.2.5.4 Disassembly of Platen Unit (Figure 4-19) 1. Remove the platen unit. (Refer to Section 4.2.4.1) 2. Remove the left shaft holder and the paper feed knob from the platen unit. 3. Pull out the platen gear at the right side of the platen unit. 4. Remove the five E-rings from the platen, and pull ...

7. —. 8. Push the notch of the frame, which secures carriage quide plate to the left to remove it. REV.-A the carriage guide plate to the frame, and slide the Plate Fig. 4-23. Removal of Carriage Guide Plate Lift the carriage unit, carriage guide shaft, and head adjust lever to remove them. ASSEMBLI...

REV.-A 4.2.5.9 Disassembly of Tractor Unit (Figures 4-29 through 4-32) 2. 3. 4. Loosen the three tabs of the sprocket mounting plate using a screwdriver and remove the side cover. (Both the left and right side covers can be removed at the same time.) Push Sprocket Mounting Plate (R) Side Cover (R) T...

5. REV.-B Pull out the sprocket assembly and the paper guide roller from the sprocket shaft and the sprocket guide shaft. When pulling out the paper guide roller, move it along the sprocket shaft toward the side with the T-shaped notch. (When assembling the paper guide roller, insert the sprocket sh...

4 . 3 A D J U S T M E N T This section describes the adjustment procedures required for reassembling the LX-800 printer. When disassembly or replacement is performed during maintenance or repairs of the parts described in this section, the following 4 . 3 . 1 P l a t e n G a p The gap between the ad...

REV.-A 0.47 0.02 mm ~ - t l - Printhead Platen Fig. 4-34. Platen Gap t Lever Frame (Left side) Carriage Guide Shaft Lever (Left) Fig. 4-35. Carriage Guide Shaft Lever Movement Carriage guide shaft (left): Turned clockwise - The platen gap widens. Turned counterclockwise - The platen gap narrows. Car...

REV.-A 5.1 5 . 2 5 . 3 Fig. Fig. Fig. CHAPTER 5 TROUBLESHOOTING GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 U N I T U N I T 5.3.1 5 . ...

5.2 U N I T R E P L A C E M E N T The unit replacement procedure is based on symptom analysis. According to the particular symptom found by the the units listed in Table 5-2 need to be replaced. Table 5-2. List of Units Unit Name Description Unit Code No. Fuse (Fl) 125V/1 .25A (for 120V) X50206 1050...

(6) The printing is incorrect in the ON-LINE mode. NOTE: It is assumed that the host computer operates normally. START Perform test printing. N Refer to other troubleshoot- ing items. . — Y interface board Replace the optionalinterface board. Standard Parallel N I ● END Replace the connection cable ...

REV.-A (Terminal assignment ) # 2 # 3 # 4 # 7 # 8 # 9 ( Wire assignment) Coil Resistance: 1 9 . 2 1.9 at (Between each dot wire and common.) Fig. 5-3. Resistance 5-1o

REV.-A Table 5-5. Board Unit Repair Problem The printer does not operate at all. (The power lampon the control panel does notlight.) ● The l/F cable is disconnected. Cause Checkpoint Solution Symptom The DC Check fuse (Fl) on the Filter unit. Replace F1. filter unit is defective. line is dead. Measu...

REV.-A Table 5-5. ROCX Board Unit Repair (Cent’d) Problem Symptom Cause Checkpoint Solution The printer does Buzzer 5 Home position Check the level of Replace Gate not operate. (The times. sensor is Pin 23. ray (3 B). power lamp on the defective. Carriage at the home control panel position: LOW ligh...

REV.-B 6.1 PREVENTIVE MAINTENANCE Proper maintenance is essential to maintain optimal printer performance for the longest possible period and to minimize malfunction frequency. Preventive maintenance includes regular cleaning of the case exterior, using alcohol, and occasional vacuuming of the mecha...

APPENDIX PRINCIPAL S P E C I F I C A T I O N S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-1 wPD781OHG (CPU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

REV.-A LIST OF TABLES Table A-1. Primary on the ROCX Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-1 T a b l e A - 2 . P P D 7 8 1 O M o d e S e t t i n g . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

A.1 PRINCIPAL S P E C I F I C A T I O N S This chapter describes the principal used in LX-800. The are shown in Table A-1. Table A-1. Primary on the ROCX Board Location No. Part Code No. 2B p P D 7 8 1 0 H G X400078 101 3B E05A03 Y 4 4 8 8 0 0 0 0 1 4C X4001 43644 3A X 4 4 0 0 6 4 9 4 0 1 c, 2C 7 4 ...

REV.-A Table A-2. PPD781O Mode Setting Mode Mode O External memory o 0 4K Byte Addresses O to OFFFH o 1 (Note) 16K Byte Addresses O to 3FFFH 1 (Note) 1 (Note) Byte Addresses O to OFEFFH NOTE: Pull-up is made. Table A-3. KPD7811 PF Operation Port Port Port Port Port Port Port Port Port 1 Port Port AB...

. 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 lines 15 - 8 are output from to Address bus lines 7 - 0 - O) are used in the multiplex mode; the ad...

A.1.2 Gate Array The gate array intergrates many CPU peripheral functions, so that fewer chips are required to construct a complete system. Figure A-6 shows the pin diagram, and Figure A-7 shows the block diagram. The details of the are given in section 2.4.2. 2 6 3 1 3 4 5 6 7 9 10 11 12 13 14 15 1...

Lower Address CPU I III I ALE I I I AD 13 15 A d d r e s s L a t c h Decode Signal Address/Data Bus I I Decoder I I II I I P a r a l l e l l / F D a t a L a t c h CR Motor PF MotorDriver PrintheadDriver LampDriver Fig. A-7. E05A03BA Block Diagram

REV.-A C M O S The is a 8K-byte CMOS static RAM. The has low power consumption, and its input/output level is compatible with the ICS. Figure A-8 shows the pin diagram, and Figure A-9 shows a block diagram for the static RAM. ● Features ● Capacity of 8192 words X 8 bits . ● Power supply + 5V DC ● 28...

REV.-A A.1.4 494 Regulator The 494 regulator is described in Figures A-10 and A-1 1 and Table A-7. ) , CONTROL , c ! E l 0 I V ME ➤ 6 - - - - (1 NON I I I II F E E D O E A O C T Cl INPUT BACK TIME INPuT - CONTROL Fig. ‘A”-10. 494 Pin and Block Diagrams Table A-7. 494 Port Functions pin No. Signal De...

REV.-A A . 1 . 5 7 4 0 7 The 7407 has hex open-collector buffers as shown in Figure A-12. 6A 6Y 5A 4A 4Y Fig. A-1 2. 7407 Pin Diagram 2

A . 2 S C H E M A T I C S A N D D I A G R A M S c l Fig. A-1 3. LCPNL Circuit Diagram A-1 3

● 4} ’ 3 4 0s ’ 3 5 R34 cm ’ 3 7 Z03 Fig, A-15, Board Component Layout A-1 7

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