Epson LX-850- Manuals

REVISION TABLE REVISION DATE C H A N G E D O C U M E N T I A 27, 1989 I 1st issue v

REV.-A TABLE OF CONTENTS CHAPTER 1. GENERAL DESCRIPTION CHAPTER 2. OPERATING PRINCIPLES CHAPTER 3. OPTIONAL EQUIPMENTS CHAPTER 4. DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT CHAPTER 5. TROUBLESHOOTING CHAPTER 6. MAINTENANCE APPENDIX vi

Figure 1-9. Lever Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21 Figure 1-10. LX-810/850 Component Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2...

REV.-A F E A T U R E S The LX-8 10/850 is a small, light-weight, low-cost, advanced paper handling printer comparable to the LX-800. Its main features are: 2. 3. 4. 6. 7. 8. 9. 10. T h e Advanced paper handling: Auto and cut sheet loading E x p a n d e d printing, implemented as a standard feature P...

REV.-A 1.2 S P E C I F I C A T I O N S This section describes LX-8 10/850 Hardware Specifications specifications. Printing Method Serial, impact, dot matrix Pin Configuration 9 wires (diameter #2 #3 #4 #5 #6 #7 #8 #9 ( ) t ( ( ) t 0.35mm (1 ( f /72”) Figure 1-2. Pin Configuration Feeding Method Fric...

REV.-A a. Push Tractor Feed 1. Use the pull-out unit. 2. Do not perform r e v e r s e feeding greater than 1/6 inch. 3. After paper end detection, accuracy of paper feed cannot be assured and reverse feeding cannot be performed. b. Push Pull Feed 1. Remove the pull-out unit and attach the pull tract...

REV.-A Table 1-6. Envelope Specifications NOTES: “ * Size (166 x 92 mm), No. 10 (240 mm x 104 mm) Q u a l i t y Bond paper, Plain paper, Air mail Thickness 0.16 mm to 0.52 mm (0.0063 in. to 0.0197 in.) Difference of thickness within printing area must be less than 0.25 rnm (0.0098 in.). W e i g h t ...

P r i n t i n g A r e a The figures below show the printing area for cut sheets. 1 8 2 - 2 5 7 mm(7. 2-10.1 “ ) *1 ) P r i n t a b l e a r e a *1 ) 0.33 “ or — P r I n t a b 3 6 4 m m m a x . “ max. a r ea — — — r ABC - L ABC - - l — . . ● 1 ) At least 3.0 mm (O. 12 in.) when the paper width is less...

REV.-A I 4.0 “ -10.0 “ ,101 m m - 2 5 4 m m I Printable area I * 2 ) 1 Printable area “ or more “ o r Printable a r e a o 0 0 0 0 0 0 0 ABC 0 0 0 0 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 0 0 0 0 0 t ABC 0000 0 0 0 - - - - - - - - - - - - - - i XYZ ● 1) 13 mm or greater for paper w...

Ink Ribbon Type: Color: Reliability: Reliability Mean Cycles Between Failure Mean Time Between Failure Life of Safety Approval Safety Standards Radio Frequency Interference 5 0 m m i n 6 0 m 2‘1 6mm(8.5 “)* 12 “ ) I I 3 r n m m i n . 2 0 3 . 2 m m 3 m m m i n . ‘ 1 (printable area) I T 1 XYZ Figure ...

1.2.2 Firmware Specifications Control Code E S C / P - 8 1 (EPSON Standard Code for Printers) Printing Direction printing with logic seeking (text) (left to right) printing (Bit-image) Input data buffer 4 K bytes Character Set 96 ASCII characters 96 Italic characters 32 International characters (13 ...

1.3 I N T E R F A C E O V E R V I E W The standard 8-bit parallel interface provided with this printer meets the specifications described below. Data Format 8-bit parallel Synchronization By STROBE pulse Handshaking By BUSY and signal Signal Level A d a p t a b l e C o n n e c t o r 5 7 - 3 0 3 6 0 ...

T a b l e 1 - 1 2 s h o w s P r i n t e r S e l e c t / D e s e l e c t i n c l u d i n g r e l a t i o n s . SELECT-IN DC and interface signals. Table 1-12. Printer Select/Deselect Control ON-LINE SW ERROR BUSY ACKNLG DATA ENTRY OFF-LINE HIGH/LOW DC LOW HIGH No pulse Disable ON-LINE HIGH DC 1 HIGH ...

1 . 4 D I P S W I T C H A N D J U N I P E R S E T T I N G S This section describes DIP switch settings for the LX-8 10/850 printer. 1.4.1 DIP Switch Settings The two DIP switches are located on the side of the printer and function as shown in Tables 1-13 through 1-15. Note that the status of the DIP...

F U N C T I O N allows the user to choose fonts the printing mode easily. T h i s f u n c t i o n p r o v i d e s f o r s e l e c t i o n o f D r a f t , R o m a n , o r S a r i s S e r i f f o n t s a n d s e l e c t i o n o f n o r m a l p r i n t i n g o r c o n d e n s e d p r i n t i n g modes....

REV.-A 1.7 T E A R - O F F The Tear-Off function F U N C T I O N can be enabled making the appropriate DIP switch setting, and will operate when the release-lever is set to the tractor position. In such a case, if the input data buffer is empty and the printer is the paper automatically be fed to th...

REV.-A 1.8 O P E R A T I N G I N S T R U C T I O N S T h i s s e c t i o n d e s c r i b e s t h e s e l f - t e s t , h e x a d e c i m a l d u m p buzzer operation. Self-Test 9: : ; <=> ; functions, error states, printer initialization, and To begin printing the self-test in the Draft mode, ...

REV.-A 1.8.3 Buzzer Operation The buzzer sounds under the following conditions: code: The buzzer sounds for 0.1 second when a code is input. Carriage trouble: Beeps 6 times, pausing briefly after 3rd beep. Paper-out: Beeps 20 times, pausing briefly after every 4 beeps. Abnormal voltage: Beeps 5 time...

1.6 M A I N C O M P O N E N T S The main components of the LX-8 10/850 printer are designed for easy removal and replacement to maintain/repair the printer. The main components are: 1 ) TAMA board: Main control board. The CPU on this board controls all main functions. 2) TAPNL-W control panel: Contr...

REV.-A 1.6.1 Board The use of the 10HG CPU simplifies the main control board circuit design. . PROM (3C) -SRAM Gate Array E05430 (3B) - CPU 10HG Figure 1-II 1. Main Control Board 1.6.2 Control Panel The control panel is the LX-8 10/850 control panel which contains the indicator LEDs and switches. Fi...

TA Filter Unit The TA filter unit contains a power cord ( 120V Version) or AC inlet Version), power switch fuse, filter circuit, and power transformer. ( 1 2 0 V V e r s i o n ) Version) Version) Figure 1-13. TA Filter Unit 1 . 6 . 4 P r i n t e r M e c h a n i s m ( M - 3 D 1 O ) The M-3D 10 printe...

REV.-A CHAPTER 2 PRINCIPLES OF OPERATION 2.1 2 . 2 OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 2.1.1 Connector Summary . . . . . . . . . . . . . ...

REV.-A 2.2.5.5 Drive Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-41 2.2.5.6 Software Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-42 2.2.6 Host Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....

REV.-A Figure 2-36. Figure 2-37. Figure 2-38. Figure 2-39. Figure 2-40. Figure 2-41. Figure 2-42. Figure 2-43. Figure 2-44. Figure 2-45. Figure 2-46. Figure 2-47. Figure 2-48. Figure 2-49. Figure 2-50. Figure 2-51. Table 2-1. Table 2-2. Table 2-3. Table 2-4. Table 2-5. Table 2-6. Table 2-7. Table 2-...

REV.-A 2.1 O V E R V I E W This chapter describes the signals at the connectors linking the primary components of the LX-8 10/850. These components include the printer mechanism and control circuits. The chapter also describes the operation of the printer’s circuitry and m e c h a n i s m . 2.1.1 Co...

REV.-A Model 3D 10 Printer Mechanism B o a r d CR motor P F m o t o r PE HOME C o n t r o l Panel 1 OPin 12Pin I I 36 Pin L J l/F TAMA Board c I T A F i l t e r (OEM) z T r a n s f o r m e r / \ I O p t i o n a l l / F Power Input I I ‘ 1 O p t i o n a l I n t e r f a c e I Board NOTE: CR = carriage...

REV.-A 2 . 1 . 2 O u t l i n e o f 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 Model 3D 10 is a 9-pin serial dot matrix printer. Because the frame and many of the components are of plastic, the mechanism is lightweight. A block diagram of the printer mechanism is shown in Figure 2-2. = 0 ....

2.1.2.1 Sensors The printer mechanism is equipped with the following sensors: Paper-End Sensor Home-Position (HP) Sensor F r i c t i o n / T r a c t o r S e n s o r Paper-End Sensor sensor) Figures 2-3 and 2-4 show the paper-end sensor. This sensor switch is ON when no paper is in place (e.g., when ...

Friction/Tractor Sensor The release sensor senses the position of the release lever in order to detect whether tractor feed or friction feed is in effect. Release Lever Position : Front F:riction Feed OFF HIGH level Release Lever Position : Rear Tractor Feed ON LOW level Front Rear / ease Lever Fric...

2.1.2.2 Motors This printer has the following motors: Carriage motor (step motor) Paper-feed motor (step motor) Carriage Motor The carriage motor is used to move the carriage right and left along the platen. This unit employs a 4-phase, 48-step motor using either 1-2 or 2-2 An Paper-Feed Motor Paper...

REV.-A 2 . 1 . 3 C i r c u i t O v e r v i e w Figure 2-10 shows a block diagram of the board circuitry. PD78 10HG (2 c) EEPROM (1 c) PROM 3 2 K B RAM ADDRESS BUS BYTEI DATA/ADDRESS BUS (LOWER BYTE) I CONTROL PANEL ADDRESS CONTROL PANEL LATCH DECODER LED DRIVE + + 12vDC I I G A E 0 5 A 3 0 ( 3 6 ) t...

2.2 P R I N C I P L E S O F O P E R A T I O N This section describes the operation of each component. 2 . 2 . 1 P o w e r S u p p l y C i r c u i t The electrical power required by this mechanism is developed using the TA Filter Unit (which combines a filter and a power transformer) and the board. T...

2.2.1.1 TA Filter Unit The filter board and the transformer are integrated into a single unit. This unit also power switch and the inlet for the AC cable. i n c o r p o r a t e s t h e The incoming AC power passes first through the over-current protection fuse (F 1 ) and the power switch, and then i...

2.2.1.2 + 12V DC Power Supply Circuit: As Figure 2-13 shows, a half-wave rectifying circuit is used to convert the incoming 12VAC voltage to + 12VDC. The 12V output is used only for the option l/F board (via the CN2 connector on the board). The board itself does not utilize this voltage. ,f\c12 D3 E...

REV.-A 2 . 2 . 1 . 3 D C P o w e r S u p p l y C i r c u i t The incoming AC + is full-wave rectified by diode bridge DB 1, generating a DC voltage of about This voltage is converted by the switching regulator to DC. Figure 2-14 illustrates the circuit design. INPUT .--1 ZD1 , HZS , 2 0 - 2 F2 15A c...

Switching Regulator Circuit When the voltage is supplied from the rectifying circuit, a 27 KHz switching pulse based on the external C3-R 10 circuit is created. At the same the standard voltage regulator outputs 5V, which is supplied, as a comparative voltage, to the negative terminal of error ampli...

Over-Current Protection Circuit Error amplifier in the detects over-current caused either by abnormal operation, or by abnormality in the line at the time of power up. Current-detecting resistor R2 is set at the EA2’s positive terminal (pin 16), and the current, converted to a voltage value, is moni...

Switching Pulse Output The output of the error amplifier in is determined by the difference between the output pulse of the internal oscillating circuit and the feedback voltage from the + 24V output. The feedback voltage changes according to printer operation (i.e., printer load). The output of the...

REV.-A 2.2.1.4 DC Power Supply Circuit The is generated by the switching and step-down action that applies to the 24VDC supplied from the power circuit. Immediately following power up, VI of SR 1 will be LOW, so that be ON. Therefore, + will be via Q6, to the chopper circuit (D2, L2) and the smoothi...

2.2.2 Reset Circuit This circuit generates the signal that initializes the printer, and is made by monitoring the + 5 and + voltages when the power is switched ON and OFF. The reset signal line is connect to the CF’U and gate array 3B. Figure 2-22 shows the reset circuit. A 1 0 1 5 MA 165 R57 10K RE...

REV.-A 2 . 2 . 2 . 2 O p e r a t i o n a t R e s e t The reset signal causes the following operations to occur. 1. The printhead carriage moves to the left-side home position. 2. The printer enters the ON-LINE mode. The print buffer and input buffer are cleared. The line spacing is set to 1/6 inch, ...

REV.-A 2.2.3.3 Carriage Drive Circuit Block Diagram Figure 2-25 shows a block diagram of the carriage motor drive circuit. In this circuit, the phase switching for the carriage motor is directly executed not by the CPU, but by the gate array (3 B), which acts on CPU 10HG ( 2 C ) CPU phase da D a t a...

REV.-A 2.2.3.4 Carriage Motor D r i v e C i r c u i t This unit utilizes an SLA7020M IC for the step motor drive. This IC causes the motor to be driven at the specified current. The IC utilizes a MOSFET power element, so that heat generation is low, and there is no need to use a radiator board. The ...

Phase I r 6 I ● F24V ( 5 8 I I Gp I I I I 2 3 4 — R30 R59 1 . 0 D5 47K C15 470p NOTE: Phase CD is equivalent to the above. Figure 2-27. SLA7020M Circuit Diagram

REV.-A Phase Signal Input Circuit Although most step-motor control IC’S input 4-phase data directly, the requires a special type of phase data. In the case of 2-2 phase excitation: Figure 2-28 shows the excitation signal input circuit. The A-phase-side excitation signal input is via a single line. T...

REV.-A In the case of 1-2 phase excitation: Figure 2-30 shows the excitation signal input circuit. When the Td terminal is LOW, the SLA702M can cut off the output current. By using this function, the unaltered 2-phase excitation signal can cause the 1-2 phase excitation to be on of the time, which i...

REV.-A Reference Voltage Generation Circuit Figure 2-32 shows the reference voltage generation circuit and Table 2-3 shows the reference voltage. The reference voltage generation circuit is shown in Figure 2-32, the reference voltages shown in Table 2-3. The SLA7020M drives the stepping motor based ...

REV.-A Constant Current Drive Circuit The constant current drive circuit is shown in Figure 2-33 (for A-phase only), and the waveforms for each part are shown in Figure 2-34. In Figure 2-33, the reference voltage is indicated by this voltage determines the peak current through resistance Resistance ...

REV.-A - - - - - - - - - 0{ - - - - - - - - - - - - - - ? - - - - - - - - - - - - - - , ------ : ----- . : - . ---- s ----------------------- Q { , 0 - - - - ; - - - - - - - - - - - - - - - - - 0 --- — 0{ ,, 0{ , km o o 0 o L ----------- , , , . ,, , - - - - - - - - - - - - - - - - - - - - - - - - -...

REV.-A 2 . 2 . 3 . 5 C a r r i a g e M o t o r S o f t w a r e C o n t r o l This section describes the carriage motor software control. Excitation System The excitation system is determined by the firmware and is executed in accordance with the carriage speed, as shown in Table 2-4. The motor drive...

REV.-A Because the carriage is driven by a step motor, the printing direction can be changed at any time, and the carriage can be stopped at any position. Carriage motor control is effected by an open-loop system w h i c h s w i t c h e s t h e p h a s e s i n a c c o r d a n c e w i t h t h e s e t...

REV.-A P r i n t i n g A r e a The printing area is defined as starting 26 phase switching times following the home position. I Acceleration Area Printing Area Figure 2-37. Printing Area and Printing Timing Abnormal Carriage Operation This unit does not employ a print timing signal sensor and cannot...

REV.-A 2,2.4 P a p e r F e e d This section describes the paper-feed operation. 2 . 2 . 4 . 1 P a p e r F e e d M e c h a n i s m O p e r a t i o n Friction feeding is used for cut sheets, and push tractor feeding is used for fanfold paper. F r i c t i o n - F e e d O p e r a t i o n The paper is he...

REV.-A Push Tractor Feed Operation When the push tractor unit is used, the paper is set such that its holes mesh with the tractor pins along the tractor belt. The paper feed motor is driven and, via the pinion on the motor shaft, rotates the gears in the direction shown in Figure 2-39, rotating the ...

REV.-A 2.2.4.3 Paper-Feed Motor Drive Circuit The paper-feed motor drive circuit is shown in Figure 2-40. The paper-feed motor is a step motor which can utilize 2-2 phase excitation. When the paper-feed signal is set to HIGH, Q20 and Q 16 are turned on, and +24 V is supplied to the motor. When the v...

REV.-A 2.2.5 This section describes the operation. 2.2.5.1 Printing Operation The dot-wire operation during printing is as follows. When the head-driving coil for a dot wire is energized, the actuating plate, which is engaged to one end of the dot wire, is attracted to the iron core, and drives the ...

REV.-A 2.2.5.3 Drive Circuit B l o c k D i a g r a m Gate array is used as an 8-bit + l-bit data latch. T h e d e t e r m i n e s t h e p u l s e w i d t h f o r t h e h e a d - w i r e d r i v e p u l s e s f r o m g a t e a r r a y by m o n i t o r i n g t h e drive p o w e r ( + 2 4 V l i n e ) ....

2 . 2 . 5 . 5 D r i v e C i r c u i t The drive pulse width is adjusted using CPU port PC6. 8 0 I GA O 6 3 Q7 5 E 0 5 A 3 0 o 6 2 I K (3 9 o 61 1 K Q8 3 0 6 0 1 K 10 0 5 9 1 0 58 K 1 12 0 2 0 2 1 K 4 0 3 1 K I GP Figure 2-44. Drive Circuit I 1 J 20V 0.5 m s CN8 HEAD Figure 2-45. Driving Waveforms 2-...

REV.-A 2 . 2 . 5 . 6 S o f t w a r e C o n t r o l During operation at 900 PPS, one print cycle is performed at each phase switching step, so as to meet the specifications of the (solenoid drive frequency: 900 Hz). The drive pulse width is adjusted by using an A/D converter (Figure 2-47) to detect t...

2.2.6 H o s t I n t e r f a c e The host interface circuit is shown in Figure 2-49. STROBE pulses from the host computer pass through the low-pass filter, consisting of R72 and C 12, and flow into the STROBE terminal. These pulses latch the parallel data and set the BUSY signal HIGH, so that subsequ...

REV.-A 2.2.7 Circuit The stores in its memory the current feed position of continuously fed paper, as well as the current panel settings. This memory retained even after power is shut off. can memorize the current position of continuously fed paper, so that this information can be maintained even if...

2.2.8 R i b b o n - f e e d M e c h a n i s m T h e r i b b o n - f e e d m e c h a n i s m c o n s i s t s o f t h e r i b b o n c a r t r i d g e a n d t h e r i b b o n - f e e d s e c t i o n . T h e ribbon-driving gear is always driven counterclockwise (regardless of the timing belt direction) ...

REV.-A CHAPTER 3 OPTIONAL EQUIPMENT 3.1 INTERFACE OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 3 . 1 . 1 M o d e l 8 1 4 3 S e r i a l I n t e r f a c e . . . . . . . . . . . . . . . . . . . ...

3.1 I N T E R F A C E O P T I O N S The LX-8 10/850 is able to utilize the Model 8100 series optional interfaces. The main interfaces are listed in Table 3-1. Table 3-1. Optional Interfaces Cat. No. Description Buffer Size Flag Control X-O Max. Bit Rates Current Loop Control (bps) 8 1 4 3 None 8 1 4...

REV.-A J u m p e r S e t t i n g s Table 3-2. Jumper Settings Function J1 ON: “TTY TXD” is brought to 12V through 470 ohm register. J2 ON: “TTY RET” is connected to signal ground. J3 ON: “TTY RXD” is brought to + 12V through 470 ohm register. J 4 ON: RXD RET” is connected to signal ground. J 5 ON: a...

3.2.1 Cut Sheet Feeder C80612* Specifications This section details the operating specifications for Cut Sheet Feeder C806 3.2.1.1 Hopper General Specifications Capacity: For paper weight of: 64 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

3.2.1.3 Printing See Figure 3-2. NOTES: Area 2’”) P r i n t a b l e a r e a min. A P r i n t a b l e a r e a approx. ABC / , , ABC Figure 3-2. Printing Area The printable length is approximately (0.87 inches) less than the actual page length. Paper feed accuracy can not be assured within (0.87 inche...

3 . 2 . 2 C u t S h e e t F e e d e r O p e r a t i n g P r i n c i p l e s . T h e c u t s h e e t f e e d e r i s d r i v e n b y f i r m w a r e i n c o r p o r a t e d i n t h e p r i n t e r . T h e f e e d e r n e e d n o t b e electronically connected to the printer. Cut sheet feeder mode can...

3.2.3 Cut Sheet Feeder Disassembly and Reassembly This section describes the procedure for removing the hopper unit of the C806 12’ cut sheet feeder. Unless otherwise specified, reassembly performed by reversing the sequence. The diagrams in Figure A-2 1, which are provided as reference for disassem...

1. Remove side covers L and R. Side cover (L) Side cover (R) Figure 3-5. Side Cover Removal 2. Remove the E-ring (6) on the paper loading roller shaft, and then remove the shaft. E-ring (6) Paper Loading Shaft Figure 3-6. Paper Loading Roller Shaft Removal 3-11

3.3 P U L L T R A C T O R The optional pull tractor provides continuous paper handling. The pull tractor is especially useful with continuous forms and labels. 3 . 3 . 1 P u l l T r a c t o r O p e r a t i o n When using the push-pull feed method, set the paper holes onto the pins along the sprocket...

REV.-A 3.3.2 Pull Tractor Disassembly and Reassembly 1. Remove the catch fastening the sprocket reduction gear to spocket mounting plate R. Then remove the Reduction gear. 2. From the sprocket shaft, remove the E-ring (6), the sprocket gear, the sprocket gear spring, and the w a s h e r . 3. Remove ...

5. 6. R e m o v e t h e E - r i n g ( 6 ) f r o m t h e s p r o c k e t s h a f t , t h e n r e m o v e s p r o c k e t m o u n t i n g p l a t e R . SprocketMounting Plate R Figure 3-15. Removal of Sprocket Mounting Plate. From the sprocket shaft and the sprocket guide shaft, pull and remove sprock...

REV.-A Reassembly 1. Insertion of the paper guide roller onto the sprocket shaft should be in the direction indicated in Figure 3-17. 2. When inserting the sprocket roller into the sprocket shaft, the marked sides of both wheels should face to the left, and the markings should be analogously positio...

REV.-A 4.1 GENERAL REPAIR INFORMATION This chapter describes the procedures for removing, replacing, and adjusting the main components of the LX-8 10/850. C A U T I O N ● Prior to beginning any of these procedures, be certain that the AC power cord is disconnected. ● To help prevent hands from being...

T o e n s u r e o p t i m a l p e r f o r m a n c e o f t h e p r i n t e r , b e s u r e , f o l l o w i n g r e a s s e m b l y a n d a d j u s t m e n t , t o lubricate, apply adhesive, clean, and maintain, according to the procedures described in Chapter 6. In referring to small parts, this manu...

REV.-A 4.2 D I S A S S E M B L Y A N D R E A S S E M B L Y This chapter details the disassembly procedures for the LX-8 a rule, reassembly is performed by simply reversing the procedures; a number of special notes, however, are provided under the heading “Notes for Reassembly.” When a disassembly or...

3. Unlock the two levers securing the to the carriage by pulling them down. Then lift and remove the Figure 4-2. Removal 4. Disconnect the head cable from the connector on the NOTE ● For the European version of the printer, a net is mounted on the Figure 4-3. Net 4 - 4

REV.-A 4 . 2 . 2 R e m o v a l o f C a s i n g This section details the procedure 4.2.2.1 Upper Casing Removal for removing the upper casing and the control panel (TAPNL). 2. Remove the sheet guide unit, printer cover, and paper feed knob. Push in the two notches securing the push tractor to the pri...

REV.-A 4. While lifting the upper casing, disconnect the cable of the control panel (TAPNL) from connector CN3 on the board. Then remove the upper casing. Figure 4-6. Upper Casing Removal -2 NOTE FOR REASSEMBLY: Before reassembling the upper casing, prepare the (Flat Flexible Cable) Panel and Board ...

REV.-A 4.2.2.2 Control Panel (TAPNL) Removal 1. Remove the upper casing (as described in the previous Section). 2. Turn the upper casing over, push in the two notches on the casing that are securing the control panel to it, and remove the control panel. anel Figure 4-8. Control Panel Removal 4-7

REV.-A 4 . 2 . 3 R e m o v a l o f C i r c u i t B o a r d s This section describes the procedure for removing the Board and the TA filter unit. 4 . 2 . 3 . 1 B o a r d R e m o v a l 1. Remove the upper casing (refer to Section 4.2.2. 1). The following connectors the board, which are connecting it t...

REV.-A 4.2.4 Removal of Printer Mechanism This section describes the removal of the platen unit, paper guide shaft, and printer mechanism. The platen unit and paper guide are removed first in order to enable quick and easy removal of the printer m e c h a n i s m . Figure 4-11. Printer Mechanism Rem...

REV.-A 3. Remove the paper tension unit. Figure 4-13. Paper Tension Unit Removal 4. Remove the spring. spring Figure 4-14. Spring Removal 4-11

5. Turn the shaft holders at the left and right sides of the platen unit as shown in Figure 4-15. Lift and remove the platen unit. t e n a. b. 6. 7. Shaft Holder Use a screwdriver to push the shaft holder outward. Turn the shaft holder counterclockwise. F i g u r e 4 - 1 5 . P l a t e n U n i t R e ...

REV.-A 4 . 2 . 4 . 2 R e m o v a l o f P r i n t e r M e c h a n i s m 1. Remove the platen unit and paper guide (refer to Section 4.2.4.1, immediately above). 2. Disconnect the cables from the following connectors on the TAMA board: (red), (white), (white), and (flexible flat cable, or Refer to Fig...

4.2.5 Disassembly of Printer Mechanism This section details the removal of components from the printer mechanism. Figure A-1 9 shows an exploded diagram of the printer mechanism, offering a view of the various components. Table A-1 7 lists the components by name. COMPONENT NAME L I S T . 4.2.5.1 Rem...

REV.-A 3. Loosen the two tabs securing the paper guide plate and spacer to the frame, and lift and remove the plate. Spacer Figure 4-19. Removal of Paper Guide Plate NOTES FOR REASSEMBLY When remounting the paper guide plate and spacer to the frame, refer to Figure 4-20 for the mounting direction. F...

4.2.5.2 Removal of Paper-Feed Motor, Release Lever, and Release /Tractor Sensor 1. Remove the printer mechanism (refer to Section 4.2.4). 2. Disconnect the motor cable from the paper-feed motor. 3. Loosen the two bent tabs on the frame which are securing the paper-feed motor, and remove the paper-fe...

REV.-A 5. From the inside of the frame, push the notch of the release lever outward. Remove the release Iever. Lever Figure 4-23. Removal of The Release Lever 6. Push the two notches securing the release/tractor sensor, and remove the sensor. Frame Push Sensor ‘ / Push Figure 4-24. Removal of Releas...

4 . 2 . 5 . 3 R e m o v a l o f P a p e r - E n d S e n s o r 1. Remove the platen unit and paper guide (refer to Section 4.2.4. 1). 2. Loosen the tab securing the paper guide. Using point A (refer to the Figure below) as a fulcrum, rotate the sensor in the direction indicated by the arrow, and remo...

REV.-A 4 . 2 . 5 . 5 R e m o v a l o f C a r r i a g e U n i t 2. 3. 4. 5. Remove the printer mechanism (refer to Section 4.2.4). Remove the printhead and disconnect the head cable. Turn the printer mechanism upside-down, and manually move the carriage unit until it is at the cut-out section of the ...

6. Turn the printer mechanism over so that it is again face up. Rotate the lever on the left side of the carriage guide shaft counterclockwise, and pull it out through cutout A. Rotate the lever on the right side of the guide shaft clockwise, and remove it in the same way. Frame A o Carriage Shaft L...

REV.-A NOTES FOR REASSEMBLY When reinstalling, position the carriage guide shaft and the head adjust lever as shown in Figure 4 - 3 1 . Guide Shaft Figure 4-31. Carriage Guide Shaft and Head Adjust Lever 2. The lever for the left side of the guide shaft is gray in color; the lever for the right side...

4 . 2 . 5 . 6 R e m o v a l o f C a r r i a g e M o t o r 2. 4! 5 Perform Steps 1 to 5 of Section 4.2.5.4. Disconnect the motor cable from the carriage motor. Disconnect the lead wire of the home-position sensor from the molded clip at the bottom of the frame. to Figure 4-32.) With a screwdriver, lo...

NOTES FOR REASSEMBLY: The following applies to E-ring reattachment: ● When attaching a ring to the left pulley shaft, set it so that its opening faces ● When attaching a ring to the right pulley shaft, set it so that its opening faces right. Use tweezers to check that the attached retaining rings ar...

REV.-A 4 . 2 . 5 . 7 R e m o v a l o f H o m e - P o s i t i o n S e n s o r 1. Remove the carriage motor frame. Follow Steps 1 to 3 of Section 4.2.5.6. 2. Push in the notch securing the home-position sensor, and remove the sensor from the carriage motor frame. C a r r i a g e M o t o r F r a m e Ho...

4 . 2 . 5 . 9 D i s a s s e m b l y o f T h e T r a c t o r U n i t 1. Remove the E-ring on the tractor shaft. 2. Pull and remove the tractor shaft from the tractor frame. 3. Pull and remove the sprocket guide shaft from the tractor frame. Tractor Frame (L) Tractor Shaft Figure 4-36. Removal of Trac...

REV.-A 4.3 A D J U S T M E N T T h i s s e c t i o n d e s c r i b e s t h e a d j u s t m e n t p r o c e d u r e s n e c e s s a r y w h e n t h e L X - 8 1 0 / 8 5 0 p r i n t e r i s reassembled or when parts are reinstalled or replaced. These procedures are necessary to ensure the correct opera...

0.01 m m \ Printhead Platen Figure 4-40. Platen Gap Adjust Lever \ Carriage Guid Shaft Lever (L Frame (Left Side) Figure 4-41. Carriage Guide Shaft Lever Movement Carriage guide shaft (left): Carriage guide shaft (right): Clockwise rotation widens gap. Counterclockwise rotation narrows gap. Clockwis...

5.1 GENERAL Troubleshooting is based on the idea that error symptoms vary according to the defective component. Troubleshooting may involve either unit replacement or unit repair, each of which is treated separately b e l o w . First try to determine the defective unit by referring to section 5.2. T...

(1) Printer Fails to Operate with Power Switch ON START No Use correct AC input voltage. - END Yes F 1 on t h e T A f i l t e r Replace the fuse. Y e s Measure the output voltage from power circuit on boa rd. I No Replace the board or TA filter unit. END Yes m END

REV.-A (3) Faulty Printing during Self-Test, but Carriage Operation is Normal No connector between the printer mechanism and TAMA circuit board correctly connected M e a s u r e t h e r e s i s t a n c e . 1 ) • B R e p l a c e t h e ● Yes Reinsert then correctly No 5-5

(5) Abnormal Control Panel Operation connector between the control No R e i n s e r t c o n n e c t o r c o r r e c t l y No No Replace the circuit board? Y e s Replace the c o n t r o l p a n e l . Replace the control Replace the circuit board? 5-8

5.3 U N I T R E P A I R This section indicates the points to be checked in response to problems, and the measures to be taken based on the result of the check. Utilize the checkpoints to determine and correct defective components. Tables 5-4 and 5-5, below, are divided into the five following column...

REV.-A 5.3.1 Control Board Unit Repair The following chart shows the main components on the board. Table 5-3. Board Parts List Location Parts Name Description Parts No. 2C KPD7810HG CPU X400078 101 3B E05A30 Gate Array Y 4 6 3 8 0 0 0 0 1 3D S R A M 2 0 6 4 C - 1 5 SRAM X 4 0 0 1 2 0 6 4 2 1A S L A ...

REV.-A Table 5-4. TAMA Board Unit Repair (Continued) Problem printer not at all. Symptom The CPU is not Cause reset i s n o t of ROM s abnormal. is Check point Check the Voltage Waveforms at the + 24V and for the RESET signal. Check pin 54 of 2C for a changing s i g n a l H I G H / L O W . Solution ...

REV.-A T a b l e 5 - 4 . T A M A B o a r d U n i t R e p a i r ( C o n t i n u e d ) Problem Symptom Cause Check point Solution is not The paper T h e 3B or At - check the base waveform Replace ‘ed normally. feed pitch is transistor and collector waveform. - a b n o r m a l Q 2 1 , Q 2 2 , or (open-...

5.3.2 P r i n t e r M e c h a n i s m R e p a i r For detailed procedures for replacing Reassembly”) and 4.4 (“Adjustment”). or adjusting parts, refer to Sections 4.3 (“Disassembly and If a problem or system recurs following an attempted repair, refer back to the Tables above to try to find other po...

P r o p e r m a i n t e n a n c e a s s u r e s occurrence of malfunctions. optimal and long-term printer performance and and minimizes the 6.1 PREVENTIVE MAINTENANCE The case exterior should be regularly cleaned with alcohol. Occasionally the mechanism to remove accumulated dirt, dust, and paper pa...

A P P E N D I X INTEGRATED CIRCUITS WITHIN THE LX-810/850 . . . . . . . . . . . . . . A-1 CPU PPD781OHG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

REV.-A This appendix provides detailed information about the integrated circuits, signal functions, capabilities, and other aspects of the LX-8 10/850 printer components. A.1 INTEGRATED CIRCUITS WITHIN THE LX-810/850 Table A-1 shows board Table A-1. Board Location I Name of I Type 3 B 3D 1A 3 A K P ...

CPU The 10/781 1 HG is comprised of an 8-bit timer counter, an 8-bit A/D converter, 256 bytes of RAM, and a serial interface. A system can easily be constructed with this IC. The main features of this are listed below. O 256 bytes of built-in RAM (addresses 0 4 0 9 6 b y t e s m a s k R O M ( a d d ...

REV.-A CPU Timing Refer to Figures A-3 through A-5 for CPU timing diagrams. Three oscillations define one state. The code fetch requires four states. During T 1 to p r o g r a m m e m o r y i s r e a d , a n d i n s t r u c t i o n s a r e interpreted during Address bus lines 15-8 are output from T ...

REV.-A (3B) This gate array was newly developed for this printer. Its functions are as follows: 1. Parallel l/F 2. Address decoder 3. Control panel LED drive 4. Data address multiplexer 5. PF motor control 6. CR motor control 7. Printhead drive Figure A-6 shows the pin diagram. Table A-6 shows pin f...

REV.-A A . 1 . 4 The is a 256-bit nonvolatile CMOS be transferred serially over the data bus. RAM containing 16 words x 16 bits, and the data can The uses a compact and low-priced 8-pin package. Each bit of RAM is paired with a bit in the nonvolatile electrically programmable ROM for backup. Data is...

(3A) The is pulse width modulation control. The b l o c k d i a g r a m i s s h o w n i n F i g u r e A - 1 3 s h o w s Reference Low Voltage I I I I Figure A-1 3. Block Diagram A-1 2

REV.-A A.2 EXPLODED DIAGRAMS AND The exploded and schematic diagrams shown in r e f e r e n c e . Power SW AC S C H E M A T I C S Figures A-1 4 to A-22 are provided as additional 0 r e d I N P U T - L C3 — . — — c l blue Figure A-1 4. TA Filter Unit Circuit Diagram A-13

REV.-A R I o GND 4 O N L I N E S W 3 FF SW 2 o LF SW ‘ w 10 0 ) , GREEN GREEN 8 READY L P 7 , o ONLINE L P 6 o PE LP 9 0 Figure A-1 5. TAPNL-W Board Circuit Diagram . . . . . A-1 4

REV.-A ● a Figure A-1 6. Board Component Layout A-1 5