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1. 3 3 3 2 DISASSEMBLY AND ASSEMBLY 3 4 3 2 1 Removing the 3 5 3 2 2 Removing the HOUSING 5 3 6 3 2 2 1 Removing the ROLLER 5 3 6 3 2 3 Removing the BOARD ASSY MAIN and PSB PSE 3 7 3 2 3 1 Removing the BOARD ASSY MAIN 3 8 3 2 3 2 Removing the BOARD ASSY PSB PSE 3 8 3 2 4 Removing the Printer 3 9 3 2 4 1 Removing the MOTOR 5 3 10 3 2 4 2 Removing the MOTOR 55 3 11 3 2 4 3 Removing the 3 12 3 2 4 4 Removing the 3 13 3 2 4 5 Removing the DETECTOR 3 14 3 2 4 6 Removing the Release Lever Position Sensor 3 14 3 2 4 7 Removing the CARRIAGE 55 3 15 3 2 4 8 Removing the Ribbon Drive Gear Assembly 3 16 3 2 4 9 Removing the PF Gear Assembly 1 2111 3 16 3 2 5 Removing the BOARD 55 3 17 3 2 6 Removing the ROLLER 8 3 18 3 2 7 Disassembling and Assembling the Optional Color Upgrade Kit 3 19 3 2 7 1 Removing the MOTOR 8 5
2. 1 1 Pin Gonfig ratioh s At aban ats 1 2 Environmental 1 Figure 1 3 Printable Area forCut Sheets Using Manual Insertion 1 5 Figure 1 4 Printable Area for Cut Sheets with the CSF 1 6 Figure 1 5 Printable Area forContinuous 1 6 Figure 1 6 Printable Area for 1 7 Figure 1 7 Data Transmission 0 1 11 Figure 1 8 Panel 1 14 Figure 1 9 C130 MAIN Board Component Layout 1 21 Figure 1 10 C130 PSB PSE Board Component Layout 1 21 List of Tables Xable I1 Opliorial Units dace eio Eee Tre wu tuer teow iade aeu 1 1 Table 1 2 Feeding 5 1 3 Table l 3 Adjust 06 1 3 Table 1 4 Specifications for Cut Sheet Paper Manual Insertion 1 4 Table 1 5 Specifications for Cut Sheet Paper CSF 1 4 Table l 6 Envelope Specifications 1 4 Table 1 7 Specifications for Continuous Paper Single Sheet and Multi Part 1 4 Table 1 8 Specifications for Continuous Paper with a Label 1 5 Table l 9 Roil Paper Specifications
3. 2 8 Table 2 5 Coloring 2 8 Table 2 6 Power Supply 2 10 Table 2 7 Power Supply Output Voltages and Applications 2 10 Table 2 8 Functions of the Main 2 12 Table 2 9 Carriage Motor Drive 0 2 15 LX 3 XI Service Manual Operating Principle 2 1 PRINTER MECHANISM OPERATION This section describes the M 3G10 printer mechanism and explains how it works 2 1 1 Printing Mechanism The printer mechanism is composed of the printhead ink ribbon and ribbon mask The printhead is a 9 pin head for impact dot printing Each wire has own drive coil which causes the wire to move in and out of the printhead to print each dot The four steps below describe how these driving wires work 1 drive signal transmitted from the control circuit to the printhead drive circuit is converted to the proper printhead driving voltage which energizes a corresponding coil The energized coil then causes the iron core to become magnetized 2 The magnetic force draws the actuating plate toward the core and the dot wire which is connected to the core rushes toward the platen 3 When the dot wire impacts the platen pressing against the ribbon and paper it prints a dot 4 When the driving voltage stops energizing the coil the magnetic force from t
4. 2 13 2 3 4 Paper End Sensor 2 14 2 3 5 Release Lever Position Sensor 2 14 2 3 6 Carriage Motor Drive 2 15 2 3 7 Paper Feed Motor Drive 2 16 2 3 8 Printhead Drive 2 16 2 3 9 Interface CIFCHILo 25 05 82e big ER ERG REN DEED EG rem 2 17 2 3 10 EEPROM Control Circuit s ate RN eet Rb d es EC ens 2 18 2 3 11 CS Motor Assembly 2 18 2 3 12 Color Ribbon 2 19 List of Figures Figure 2 1 Printhead 2 1 Figure 2 2 Carriage Movement 2 2 Figure 2 3 IFriction Advance 2 3 Figure 2 4 Push Tractor paper Advance Mechanism 2 4 Figure 2 5 Pull Tractor paper Advance 2 5 Figure 2 6 IPush Pull Tractor PaperAdvance Mechanism 2 6 Figure ar Paper gelo enit be ORT ORA Fazi 2 6 Figure 2 8 Ribbon Advance Gear 2 7 Figure 2 9 ColorShift 2 9 Figure 2 10 Plat
5. 3 19 3 2 7 2 Removing the GEAR 5 3 19 3 2 7 3 Removing the Color Ribbon 3 19 List of Figures Figure 3 1 Procedure for Disassembling the 3 4 Figure 3 2 Removing the 3 5 Figure 3 3 Removing the HOUSING ASSY UPPER 3 6 Figure 3 4 Removing the ROLLER 55 3 6 Figure 3 5 Removing the SHIELD 3 7 Figure 3 6 Removing the BOARD ASSY MAIN and PSB PSE 3 8 Figure 3 7 Bendingthe LED Lead 3 8 Figure 3 8 Removing the Printer 3 9 Figure 3 9 Removing the MOTOR 3 10 Figure 3 10 Removing the MOTOR 5 3 11 Figure 3 11 Removing the 3 12 Figure 3 12 Removing the 3 13 Figure 3 13 Wiring of the PE 5 3 13 Figure 3 14 Removing the 3 14 Figure 3 15 Removing the Release Lever Position Sensor 3 14 Figure 3 16 Removing the CARRIAGE 56 3 15 Figure 3 17 Removing the Ribbon Drive Gear Assembly
6. tl 150 2 072 022 93 161 3 1 KOSZ HYSZ I 1 13 MS 0 X01S 12 780 652 22023 93432 40001 d000 73 2 nt 0 M S 0 7 400 MS 0 X00 doozz Bly eza ee EDER Li d 18 091 ar 9 2 n E 7 i 1490001 00 n95 Devesza 222 25 1 1 ircuit Diagram Figure A 4 C130 PSE Board Assembly C 8 Appendix LX 300 Service Manual A 3 CIRCUIT BOARD COMPONENT LAYOUT ee 5 pa m x t 2 SCSI 4 EOIAOSBA 8i pron EEM E td 1 CI30 MAIN CNS 1 ks 74 52 u SAHO3 VI aS 12 B CRT Bao RAGE i zn m lt 5 P RMA 4L th 1 Pag 2 c5 c3 Bo 14 tj LIE 046 51956 JE 42 Bre 3 amp LE LA7022H 5025 m __ CNS 2 Se den 4 ELA AW Is I 1 A 5 B AS AG w DEC A 02 5 Ecz 25 CNI iron S 1 L Xu F z Figure A 5 C130 MAIN Board Assembly Component Layout 300 81601057 ASSY 212 A s 161 of Jef Se W d 2 RO if af 24 Da 3 2 4 rais a tg gt ANISLYJH N0110Y9 21812313 40 XSTU 1935394 a 5 8 2 m an z m 9 m u e 5 z z e 4 6 u ig 162 QU P2x at g I 5130 PSB EIE zl 3 R
7. 1 5 8 8 9 Table 1 12 Table 1 13 Table 1 14 Table 1 15 Table 1 16 Table 1 17 Table 1 18 Table 1 19 Table 1 20 Table 1 21 Table 1 22 Table 1 23 Table 1 24 Table 1 25 Table 1 26 Table 1 27 Table 1 28 Table 1 29 Table 1 30 Table 1 31 Table 1 32 Character 1 Printing Speedo seist orkai Gia dees Pee aL Eee Sede Re 1 10 ss sa Se dece ny ha Sur WAGA 1 10 Signal and Connector Pin Assignments for the Parallel Interface 1 12 Signal and Connector Pin Assignments for the Serial Interface 1 13 Font Selection cs rb festus do sos ate sun aeta aa ct o se ata AA Font Lights and Language 1 17 Default 1 17 Character 1 18 Shap of Zero Ain Eu 1 18 Skip Over 1 18 Character Tables 245 Sse d ca Pe 1 18 Auto Line 1 19 Page Lengi rr 1 19 Tear a d vore rapa o aaa E ion AREK 1 19 Ale ie e POETA Pe RC eed B ed Meine a dud desea 1 19 Ateriat APER SRM O ETT 1 19 BIURIBIG v Aa de at s dea GOA Rod e et eod WGA taped 1 19 Partys Bit 2565246 prc nee ends Ge S a edid esi r
8. 1 9 1 3 INTERFACE SPECIFICATIONS 1 11 1 3 1 Parallel Interface 1 11 1 3 2 Serial InterfaceSpecifications 1 13 1 4 OPERATING INSTRUCTIONS 1 14 1 4 1 Control Panel 1 14 1 4 2 Self test Function oc cca sito be aane 1 15 1 4 3 Hexadecimal Dump 1 15 1 4 4 PrinterStatus 1 15 1 4 5 Selected i cer reote EE em eds dad 1 15 1 4 6 Paper Position 1 15 1 4 7 Printer Initialization sio a tt Oe Cor le Rete Male 1 16 1 4 7 1 Hardware Initialization OM a ene oe eel ed 1 16 1 4 7 2 Software 1 16 1 4 8 Printer Settings rene eX Fu E ids T ERROR EE 1 16 1 4 8 1 Selectable Printer 1 16 1 4 8 2 Changing the Default 5 1 17 1 5 MAIN COMPONENTS 1 21 1 5 1 C130 MAIN 1 21 1 5 2 C130 PSB PSE 1 21 Figure 1 1 Figure 1 2 Table 1 10 Electrical 1 Table 1 11 List of Figures Exterior View of the 300
9. 5 3 Table 5 7 Symptoms and Problems 5 4 Table 5 8 Repairing Problems in the Main Board Assembly 5 11 Table 5 9 Repairing the Printer Mechanism 5 13 LX 300 Service Manual Troubleshooting 5 1 OVERVIEW Follow the procedure in the flowchart below to identify printer problems so w Unit Level Troubleshooting Repairing the Printer Mechanism Repairing the MAIN Board Assembl The Fault is corrected Figure 5 1 Troubleshooting Procedure Note If the power supply board assembly is faulty it must be replaced as a whole unit No field repair should be performed on it except for the replacement of fuse F1 The following tables provide troubleshooting information Table 5 1 Printhead Coil Resistance Part Specification Printhead Coil resistance 33 3 3 3 at 25 C 77 F Rev A 5 1 Printhead lt A Head Pin No 68492 cc C3517 View A C COMMON Figure 5 2 Printhead Connector Pin Alignment Table 5 2 Printhead Driver Test Points Test Method Set Meter to Diodes Check with Power Off Q1 Q2 Q3 Q4 Check from base to collector Not open and not shorted Q5 Q6 Q7 Q8 Check from base to emitter from base to collector base Transistor Numbers Meter Reading Reverse leads and test again to emitter Table 5 3 Motor Driver Test Points Transistor Test Method Numbers Set Meter to
10. 9 VDC line over voltage Protection Circuit Figure 2 11 Power Supply Circuit Block Diagram Rev A 2 11 Operating Principles LX 300 Service Manual 23 CONTROL CIRCUIT The control circuit consists of the C130 MAIN board assembly This section describes the major components and explains how the board works 2 3 1 Control Circuit Operation Overview The printer s system IC contains a CPU uPD78C10A type that runs at 14 74 MHz a gate array E05A79 type and a main RAM 8KB SRAM It oversees control of all the components in the printer The printer uses the E05A90 gate array to control address decoding parallel communications PF motor drive signals etc Table 2 5 shows functions of main IC and circuits Figure 2 18 shows the control circuits in block diagram form Table 2 8 Functions of the Main IC Location Function CPU Block Receives data from the host computer and sends it to the input buffer in RAM under interrupt processing control Extends the input data held in the buffer to create image data Loads this image data to the image buffer in RAM Transfers the image data to the printhead drive circuit Also controls various parts of the printer mechanism such as PF motor control and color select motor control SYSTEM IC Gate Array Block Controls the functions below Address decoding Parallel communications eImpact head drive control CR motor control Main RAM Block Holds the CPU working
11. 3 2 4 1 3 10 3 2 4 2 13 11 Removing the MOTOR AS SY PF Removing the MOTOR ASSY CR 1 3 2 4 3 3 12 3 2 4 4 3 13 Removing the PLATEN Removing the DETECTOR ASSY 3 2 4 5 3 14 Removing the DETECTOR ASSY HP Saree 3217 ieee Removing the CARRIAGE ASSY 3 2 4 9 3 16 Removing the F Gear Assv 3 2 4 6 3 15 Removing the Release Lever Position Sensor Removing the Ribbon Drive Gear Assy 3 2 5 3 17 Removingthe BOARD ASS Y INTE RFACE Figure 3 1 Procedure for Disassembling the Printer 3 4 Rev A LX 300 Service Manual Disassembly and Assembly 3 2 1 Removing the Printhead 1 Remove the COVER ASSY PRINTER EDGE GUIDE ASSY ribbon cartridge TRACTOR ASSY PLATEN KNOB and optional color upgrade kit 2 Remove the CPB M3 x 14 screw attaching the printhead 3 Remove the printhead 4 Remove the flexible flat cable FFC from the printhead CPB M3x14 Printhead CARRIAGE ASSY Figure 3 2 Removing the Printhead Rev A 3 5 3 2 2 Removing the HOUSING ASSY UPPER 1 Remove the COVER ASSY PRINTER EDGE GUIDE ASSY ribbon cartridge TRACTOR ASSY PLATEN KNOB and optional color upgrade kit 2 Remove the 4 CPB M4 x 14 screws attaching the HOUSING ASSY UPPER to the HOUSING LOWER 3 Liftoff the HOUSING ASSY UPPER CPB M4X14 HOUSING ASSY UPPER HOUSING LOWER Figure 3 3 Removing the HOUSING ASSY UPPER 3 2 2 1 Removing the ROLLER
12. 0 48 mm 0 0063 in 0 019 in Weight 45 90 g m 12 1 24 Ib Quality Bond paper not curled folded or crumpled plain paper airmail paper Notes Printing of envelopes is guaranteed only when the temperature is room temperature and humidity is normal 15 25 C 59 77 F 20 60 RH e Variations in envelope thickness must be less than 0 25 mm 0 0098 in e When inserting envelopes keep the longer side horizontal Table 1 7 Specifications for Continuous Paper Single Sheet and Multi Part 101 6 mm 254 mm 4 0 in 10 0 in Total thickness 0 065 mm 0 25 mm 0 0025 in 0 0098 in 52 3 82 g m 4 22 Ib not multi part Weights a 2 15 Ib multi part 40 58 2 g m copies 3 sheets 1 original 2 copies Quality Plain paper recycled paper carbonless multi part paper 1 4 Rev A rea LX 300 Service Manual Product Description Table 1 8 Specifications for Continuous Paper with a Label Label size W x L 63 5 mm min x 23 8 mm min 2 5 in min x 15 16 in min Width of base paper 101 6 mm 254 mm 4 0 in x 10 0 in Thickness of base 0 07 mm 0 09 mm 0 0028 in 0 0035 in paper Total thickness 0 16 mm 0 19 mm 0 0063 in 0 0075 in Weight 64g m2 17 Ib Quality Plain paper Notes eUse only continuous type labels and use them only with the tractor e Example of labels Avery Continuous Form Labels Avery Mini Line Labels e Printing of en
13. 6 lead on pin 2 Toggle the sensor by inserting and removing a sheet of paper Meter should toggle between open and short Open active Release Lever Place one lead on pin 1 and the other Meter should toggle between Position Sensor lead on pin 2 Change the paper release open and short Open CN3 lever position continuous paper Color Ribbon Sensor CS Board Assembly Place one lead on pin 1 and the other Meter should toggle between lead on pin 2 Toggle sensor position open and short Open active Table 5 6 Error State Indication Error Indication Error Status The printer beeps eee and the PAUSE light blinks Paper out error Paper is not installed The release lever is set to the TRACTOR position before the cut sheet is ejected and the PAUSE light The release lever is set to the FRICTION stays on position before the continuous papar is ejected Fatal error Power supply voltage is abnormal Votes e The printer beeps for 1 10 of a second with a 1 10 second pause The printer beeps for 1 2 of a second with a 1 10 second pause The printer beeps Operating error Rev A 5 3 Troubleshooting LX 300 Service Manual 5 2 UNIT LEVEL TROUBLESHOOTING You may be able to identify the defective unit just from the symptom displayed The table below provides the symptoms for a number of failures so that you Can easily identify the problem Once
14. The C130 PSB PSE power supply board consists of a transformer switching FETs regulate IC diode bridge etc This board has two ratings for input AC voltages Switching FET Diodde Bridge Power Switch Transformer Fuse Regulater IC Figure 1 10 C130 PSB PSE Board Component Layout Rev A 1 21 CHAPTER 2 Operating Principles Table of Contents 2 1 PRINTER MECHANISM OPERATION 2 1 23 1 Printing 2 1 2 1 2 Carriage Movement 2 2 2 1 3 Paper Handling 2 3 2 1 3 1 Paper Feed 2 3 2 1 3 2 Paper Advance 2 3 2 1 4 Ribbon Advance 2 7 2 1 5 Ribbon Shift 2 8 2 1 6 Platen GapAdjustment 2 9 2 2 POWER SUPPLY OPERATION 2 10 2 2 1 Power 2 10 2 2 2 Power Supply Circuit 2 11 2 3 CONTROL CIRCUIT 2 12 2 3 1 Control Circuit Operation 2 12 2 3 2 Power On Reset 2 13 2 3 3 Home Position Sensor
15. Nippers B740500100 Tweezers B741000100 Soldering iron B740200100 E ring holder 2 5 740800400 Phillips screwdriver No 2 B743800200 Normal screwdriver B743000100 Thickness gauge E Note X All tools are commercially available Table 3 2 Equipment Required for Maintei ance Description Specification Multimeter Oscilloscope 50 MHz Note oscilloscope is required only for servicers who repair to the component level Rev A 3 1 Disassembly and Assembly LX 300 Service Manual 3 1 3 Service Checks After Repair Before returning the printer after service usethe checklistin Table 3 3 which provides a record to make servicing and shipping more efficient Table 3 3 Inspection Checklist for Repaired Printer Category Item to Check Is Check Required Are any wires broken Chsck U Not necessary Printhead L checked Not necessary Does the carriage move smoothly L Movement noisy L Mechanism dirty C Checked Not necessary Mechanism oily mechanism ue CRE Pn s the CR motor assembly at the correct temperature not overheating C Checked Not necessary Is paper advancing smoothly Movement noisy L Mechanism dirty Checked L Not necessary Carriage Paper Mechanism oily advance mechanism Is the Paper advance motor running at the correct temperature not L Checked Not necessary Printer overheating units Is the type of paper in the printer feeding smoot
16. Pin l o Signal Name Function 0 CRA CR motor assembly Phase A 0 CR motor assembly Phase B Et d CRCOM CR motor assembly Common CRCOM J CR motor assembly Common 0 CR A CR motor assembly Phase 6 0 CR B CR motor assembly Phase Table A 3 Connector Pin Assignments CN3 Function 0 PB PF motor assembly Phase B Em PFCOM PF motor assembly Common 0 PFA PF motor assembly Phase PF motor assembly Phase Table A 4 Connector Pin Assignments CN4 Pin Signal Name Function avoc 1 S435 VC GND Signal ground Signal ground l fvt DC voltage for logic VL DC voltage for logic 4 02 5 2 A ndix LX 300 Service Manual Table A 5 Connector Pin Assignments CN5 Pin l o Signal Name Function l 1 o 7 Headdata7 2 o Headdata1 3 o HD5 ____ Headdata5 4 o HD3 Head dna 6 HDCOM Common 7 HDCOM 7 Common VP 8 0 HD2 Headdata2 9 o HD9 Headdata9 10 HD4 Headdata4 1 o Headdata8 12 0 HD6 Head data 6 Signal Name Function PE PE sensor Jeano Signal Table A 7 Connector Pin Assignments CN7 Pin l o Signal Name Function GND Signal ground Table A 8 Connector Pin Assignments CN8 en ro owane RELSW Release Lever Position Sensor GND Signal Ground Table A 9 Connector Pi
17. the problem has been identified refer to the flowchart listed in the right hand column of the table below to determine the cause of the problem Table 5 7 Symptoms and Problems Printer fails to operate Carriage does not move 5 5 Control panel indicator LEDs do not light when the power is on moves away from home position at power on The carriage returns to home position correctly but the 5 6 printer then fails to enter the READY mode Abnormal carnage operation Printing is faulty during self test but printing at all 5 7 carriage operation is Faulty printing some of the dot are not printing normal Abnormal paper feed The printer prints but paper feeds incorrectly 5 8 Abnormal control panel operation When the LF FF button is pressed no paper is fed 5 9 Data sent by the host Carriage operates normally at power up and self test computer is printed is executed correctly but data is not printed 5 10 incorrectly Data from the computer is printed incorrectly The repair procedure flowcharts use the following symbols STRAT Start O gt Branching Return to the Ld Processing V Start of the item Forwarding to w END another item lt gt Decision Figure 5 3 Flowchart Symbols 5 4 Rev A EN LX 300 Service Manual Troubleshooting 1 Printer fails to operate when the power is on START Is the AC input volt
18. Draft condensed Bac NE N 220 165 Draft emphasized 59 _ Draft double width Sepi 40 _ 110088 NLQ dop 44 33 NLQ 53 40 NLQ double width i 22 16 Data in parentheses indicates the speed on a line containing at least one of the following A line containing a userdefined character A line containing one of the 50 characters corresponding to hex codes BO to DF and F4 i and F5 A line that is printing when printhead driving voltage drops from over duty printing When voltage drops below the lower limit the printer stops printing in the middle of the line and then prints the rest of the line at a slower speed Table 1 14 Resolution Printing Mode Horizontal Density Vertical Density Adjacent Dot Print 60 dpi 72 Tei 72 dpi 80 dpi 72 Hm BRA Bit image 90 dpi 72 22 a 120 dpi 72 Po 120 dpi m 1 240 dpi 72 dpi No 1 10 Rev A LX 3 30 Service Manual Product Description 1 3 INTERFACE SPECIFICATIONS LX 300 has parallel interface and serial interface one of which can be selected in default setting mode Auto selection is also available 1 3 1 Parallel Interface Specifications The LX 300 is equipped with an 8 bit parallel interface standard Data format 8 bit parallel Synchronization By STROBE pulse synchronization Handshaking By BUSY and ACKNLG signals Signal level TTL compatible level Adaptable connector pm 57 30360 Amphenol o
19. TUE NTI Otherwise operate at all operate AEE ULU replace the is abnormal main board assembly Check the oscillator signal at either pin 158 or 159 of the CPU If a signal is detected replace CR1 Otherwise replace the main board assembly The CPU is defective Rev A 5 11 Troubleshooting LX 300 Service Manual Table 5 8 Repair of Problem in the main board assembly Continued Check the CR motor assembly phase signal at pin 5 and output signal at pin 1 of IC 1 Problem Solution The carriage pegs i iz iz The carnage does not IC A1 is Otherwise operates operate defective TI LU ET replace the abnormally main board assembly apal FIL IT T i LL Bd Check the signal at the collector and base of 011 012 Q13 or Replace any Q14 of these One or more transistors of the that are The paper The paper following defective feeds does not feed transistors is Q11 Q12 abnormally atall defective Q13 or Q14 Q11 Q12 Otherwise Q13 Q14 replace the main board assembly Check the input signal at the collector and base of Q1 Q9 any The self test transistors is not that Self test executed or a transistor defective
20. area and various buffers ROM Contains the program that runs the CPU and holds the character design also called the character generator RESET IC 2 Hardware reset function EEPROM An electrically writable and erasable ROM used to hold such information as the TOF position and bidirectional adjustment value Serial I F IC 2 Driver receiver HEAD DRIVER TRANSISTERS 01 09 CR MOTOA DRIVER 1 CONTROL BUTTONS PF MOTOR DAIVEA TRANSISTERS 011 014 POWER OFF SENSING IC A6 RESET IC AZ SYSTEMIC RELEASE LEVER SENSOR REGULATOR 5V DC VL p Figure 2 12 Control Circuit Block Diagram 2 12 Rev A LX 300 Service Manual Operating Principle 2 3 2 Power On Reset Circuit When the power supply is turned on the VL goes up to 9 but reset IC output IC A2 Pin 6 is delayed for approximately 80 1 ma before going up to 9 VDC The system IC receives this Lowlevel signal from the reset IC and resets itself 5V Figure 2 13 Power On Reset Circuit Diagram 2 3 3 Home Position Sensor Circuit This printer has a connector switch to sense the carriage home position The system IC receives a signal HIGH or LOW from the HP sensor and recognizes the carriage home position when the printer is turned on The connector switch is closed LOW when the carriage is in the home position and is open HIGH
21. printer by pressing the LF FF button 4 Load the GWBASIC program onto the PC 5 Insert a diskette containing the LX 300 Adjustment Program into the PC s diskette drive 6 Load the LX 300 Adjustment Program 7 When you run the program the following message appears on the display ro LX 3 MI Adjustment Program 1 Bi D Adjustment 2 Defaults amp Machine Information Settings 3 END If ready press 1 3 and the Enter key s i FRRSGREUREKKEKKAA gt ooo Figure 4 2 The Bidirectional Pattern Print Rev A LX 300 Service Manual Adjustments 8 11 12 13 Type 1 to select Bi D Adjustment then press Enter After 10 line feeds the printer prints 5 rows of H characters in both draft and LQ modes When the printer begins bidirectional printin amp the message Bi D TEST PRINTING appears on the display After printing is complete the following message appears on the display Bi D INPUT Draft From the 5 rows of draft patterns find the row in which the vertical lines in the H are best aligned then enter the value assigned to that row The following figure is an example of the Bi D printout After you enter the value for draft the following message appears on the display LO From the 5 rows of LQ patterns find the row in which the vertical lines in the H are best aligned then enter the value assigned to that row The prin
22. printing is from Q1 Q9 abnormal particular dot are defective 01 09 is not being Otherwise printed replace the main board assembly Data from the Data Replace IC2 host corruption computer is occurs when 2 printed the interface assembly incorrectly is used 5 12 Rev A LX 300 Service Manual Troubleshooting 5 4 REPAIRING THE PRINTER MECHANISM For detailed procedures for replacing or adjusting parts refer to Chapter 3 Disassembly and Assembly and Chapter 4 Adjustments If a problem or symptom recurs following an attempted repair refer to Table 5 10 to try find other potential causes Table 5 9 Repairing the Printer Mechanism Problem Symptom Cause Check Point Solution Foreign substances are lodged Manually move the timing belt Remove the the gears or to see if the motor can rotate foreign The CR motor freely substances The CR motor assembly fails the assembly fails to operate the mechanism 10 operate timing belt Measure the motor coil after power on j Replace the poner onil The CR motor 898108 motore CR motor assembly is assembly and shorted also check the CR gt defective drivers if motor assembly drivers on the necessary main board y ue iss Check for broken or worn Replace the The CR motor defective pulleys belt pulleys e Check that the timing belt is Reinsert
23. provides detailed information about the LX 300 1 2 1 Hardware Specifications Printing method Serial impact dot matrix Pin configuration 9 wires Pin diameter 0 29 mm Figure 1 2 Pin Configuration Printing direction Bidirectional with logic seeking for draft text with monochrome printing Unidirectional printing for graphics NLQ text bit image and color printing 1 2 Rev A LX 300 Service Manual Product Description 1 2 1 1 Paper Handling Specifications Feeding system Friction feed or tractor push and pull feed Feeding method Cut sheets Manual insertion top entry and feeding with the optional cut sheet feeder CSF Continuous paper Push and pull tractor feeding Feeding pitch 1 inch 1 inch or programmable feeding in increments of 16 inch minimum Paper paths Cut sheet path Top entry manual insertion or the optional CSF Continuous paper paths Rear entry push tractor feed Rear entry pull tractor feed Continuous paper parking Possible using push tractor CSF Single bin manual insertion using optional CSF top entry Paper feeding speed See Table 1 2 Table 1 2 Feeding Speed I G inch Line Feed Continuous Feed 79 ms line 2 78 inches second Tractor single Tractor double 96 redline 2 08 inches second Friction feed Set the release lever to the friction position When a sheet is inserted into the top slot place its left edge at the marked position Do not perform reverse fee
24. the optional color upgrade kit The CS motor assembly is a permanent magnet PM stepping motor driven with 2 2 phase excitation in proportion to the desired rotational speed This motor can be rotated in either direction and stopped at any position Four phase signals are directly output from the system IC and pass through a transistor array The drive voltage is constant i e 35 VDC from the VP line Source Voltage 35 VDC 10 Current Consumption 245 mA peak SYSTEM IC MOTOR ASSY CS PA7 PA6 PAS PA4 PB6 Printer Color Upgrade Kit Figure 2 23 CS Motor Assembly Circuit Diagram 2 18 Rev A em rne LX 300 Service Manual operating Principle 2 3 12 Color Ribbon Sensor Circuit The printer s color ribbon circuitry in shown in the figure below The CPU receives signals HIGH or LOW from the mechanical switch The signal is HIGH when a color ribbon is installed and is LOW otherwise 5V SYSTEM Color Ribbon Sensor R66 64 R44 AN4 Printer Color Upgrade Kit Figure 2 24 Color Ribbon Sensor Circuit Diagram Rev A 2 19 CHAPTER 3 Disassembly and Assembly Table of Contents 3 1 OVERVIEW 3 1 3 1 1 Disassembly 5 3 1 33 2 TOONS a wa 5 a EO yim a a ated e dois hb eo 0 3 1 3 1 3 Service 3 2 3 1 4 Specifications for
25. to the other print normally troubleshooting items Check the default setting 5 Is the interface cable connected correctly Replace the interface cable from the host conmputer Replace the BOARD ASSY MAIN 15 the printed result clear Increase the the setting position of the paper thickness lever n 15 the printed result clear Adjust the platen gap Sect 4 1 1 LX 300 Service Manual Troubleshooting 5 3 REPAIRING THE MAIN BOARD ASSEMBLY This section provides instructions for repairing a defective main board assembly It describes various symptoms likely causes and checkpoints Checkpoints refer to proper waveforms resistance values and other values to be checked when evaluating the operation of any potentially faulty component Check these values and take the appropriate action Note This section is required only for servicers who repair to the component level Table 5 8 Repairing Problems in the Main Board Assembly Check the voltage waveforms for the 5 VDC line IC1 1 and for the reset signal IC1 pin 13 when the power is on Problem The reset circuit is not operational Otherwise replace the main board assembly Check that pin 105 of IC 1 change from HIGH to LOW Replace The printer The CPU nmt ICE f 3 does i does not Selection
26. when the carnage is out of home position 5V SYSTEM IC ICI HP Sensor Figure 2 14 Home Position Sensor Circuit Diagram Rev A 2 13 Operating Principles 2 3 4 Paper End Sensor Circuit This printer has a connector switch for sensing the paper end The system IC receives a signal HIGH or LOW from the connector switch and recognizes a paper end The connector switch is closed LOW when there is no paper on the platen and is open HIGH when paper is present 5V t SYSTEM IC_ PE Sensor Figure 2 15 Paper End Sensor Circuit Diagram 2 3 5 Release Lever Position Sensor Circuit This printer has a connector switch to detect the type of paper handling The system IC receives a HIGH or LOW signal from the connector switch to indicate whether the paper is fed using friction feed or push tractor feed Thecomector switch is closed LOW when friction feed is selected and is open HIGH when push tractor feed is selected 5V SYSTEM IC ICI R53 Release Sensor Figure 2 16 Release Lever Position Sensor Circuit Diagram LX 300 Service Manual Rev A LX 300 Service Manual Operating Principle 2 3 6 Carriage Motor Driver Circuit Figure 2 17 shows the carriage motor driver circuit The carriage motor driver uses an open loop constant current drive arrangement The motor is driven with 2 2 phase excitation and 1 2 phase excitation The carriage motor driver IC Al detects the amount of cu
27. with a pair of tweezers DETECTOR HP 1 4 f AG om 5 FRAME BASE A C Clip Figure 3 14 Removing the DETECTOR HP 3 2 4 6 Removing the Release Lever Position Sensor 1 Remove the MOTOR ASSY PF see Section 3 2 4 1 2 Release the 2 clips that attach the release lever position sensor to the frame of the MOTOR ASSY PF 3 Remove the release lever position sensor from the frame of the MOTOR ASSY PF Frame of the Release Lever MOTOR ASSY PF position Sensor Clip Figure 3 15 Removing the Release Lever Position Sensor 3 14 Rev A LX 300 Service Manual Disassembly and Assembly 3 2 4 7 Removing the CARRIAGE ASSY 1 Remove the printer mechanism see Section 3 2 4 2 Remove the BELT TENSION SPRING from the hook on the MOTOR ASSY CR see Section 3 2 4 2 and remove the TIMING BELT of the CARRIAGE ASSY from the PULLEY DRIVE 3 Release the hook that attaches the SHEET CABLE HEAD to the FRAME BASE Slide the cable to the left and remove it 4 Remove the printhead FFC from the FRAME BASE 5 Remove the GROUNDING PLATE SHAFT CR from the left side of the printer mechanism 6 Rotate both sides of the BUSH PARALLEL ADJUST and remove them from the FRAME LEFT and RIGHT 7 Remove the SHAFT ASSY CR GUIDE and the CARRIAGE ASSY LEVER G ADJUST SHAFT ASSY CR GUIDE 277 GROUNDING CARRIAGE PLATE SHAFT CR ASSY BUSH PARALLEL ADJUST FRAME LEFT BRE SHEET CABLE HEAD X FR
28. 3 16 Figure 3 18 Removing the BOARD ASSY INTERFACE 3 17 Figure 3 19 Removing the ROLLER ASSY DRIVEN 3 18 Figure 3 20 Disassembling the Optional Color Upgrade Kit 3 19 List of Tables Table 3 1 Recommended 3 1 Table 3 2 Equipment Required for 3 1 Table 3 3 Inspection Checklist for Repaired 3 2 Table 3 4 Screw Abbreviations 3 3 gue LX 300 Service Manual Disassembly and Assembly 3 1 OVERVIEW This section describes various points to note when disassembling and assembling the printer 3 1 1 Disassembly Precautions Follow the precautions below when disassembling the printer WARNING Before disassembling assembling or adjusting the printer disconnect the power supply cable from the AC power socket Failure to do can cause personal injury CAUTIO To maintain efficient printer operation e Use only the recommended tools for maintenance work e Use only the recommended lubricants and adhesives see Chapter 6 e Adjust the printer only in the manner described in this manual 3 1 2 Tools Tables 3 1 and 3 2 list the tools recommended for disassembling assembling or adjusting the printer Use only tools that meet these specifications Table 3 1 Recommended Tools Part No Round nose pliers B740400100
29. 60 561 562 563 LX 300 Service Manual Table A 10 Part No Reference Table Continued Description LEVER G ADJUST BUSHING PARALLEL ADJUST SHAFT FRICTION GEAR 34 SPURGEAR 25 C P B SCREW M3 x8 COMPRESSION SPRING 800 COMPRESSION SPRING 500 DAMPER DAMPER BASE SHEET PE DETECTOR FRAME TR LEFT FRAME TR RIGHT El 564 565 566 567 568 569 570 571 572 573 574 575 Description P ROM TCNOO TRACTOR LEFT TRACTOR RIGHT SHAFT TR SHAFT GUIDE TR PAPER SUPPORT SPURGEAR 17 RETAINING RING TYPE E 5 RETAINING RING TYPE E 6 ROLLER SUB ASSY EJ ROLLER EJ TRANSMISSION ROLLER EJ SUPPORT HOLDER EJ ROLLER Rev A A 13 LX 300 Service Manual Appendix A 5 CASE OUTLINE DRAWING 132mm Figure A 9 LX 300 Case Outline Drawing A 14 Rev A
30. AME BASE FRAME RIGHT CABLE HEAD Figure 3 16 Removing the CARRIAGE ASSY Rev A 3 15 Disassembly and Assembly LX 300 Service Manual 3 2 4 8 Removing the Ribbon Drive Gear Assembly 1 Remove the printer mechanism see Section 3 2 4 2 Release the3 hooks attaching the COVER RD to the FRAME LEFT 3 Remove the COVER RD 4 Remove the BELT TENSION SPRING between the hook on the MOTOR ASSY CR and the hook on the FRAME BASE see Section 3 2 4 2 5 Remove the TIMING BELT from the PULLEY DRIVEN RATCHET RD COVER RD N ring 2 3 TIMING BELT C PULLEY WASHER 1 PULLEY FLANGE RIBBON PLANETARY GEAR S EBD 5 1 gd 2 PLANE WASHER SPRING WAStiER GEAR 14 4 UG Q 5 Nur FRAME LEFT 7 PULLEY DRIVEN SHAFT PULLEY DRIVEN ps GEAR 13 2 GEAR 5 1 16 2 Figure 3 17 Removing the Ribbon Drive Gear Assembly Assembly Note Make sure not to put the TIMING BELT between the COVER RD and the FRAME LEFT 3 2 4 9 Removing the PF Gear Assembly 1 Remove the MOTOR ASSY PF see Section 3 2 4 1 2 Remove the PF gear train and the release lever 3 16 Rev A LX 300 Service Manual Disassembly and Assembly 3 2 5 Removing the BOARD ASSY INTERFACE 1 Remove the printer mechanism see Section 3 2 4 2 Remove the GROUNDING PLATE connecting the SHIELD PLATE INTERFACE and the SHIELD PLATE 3 Remove the CBB M3 x8 screw and the CBT M3 x 10 screw attaching the COVER BOTTOM to t
31. ASSY EJECT 1 Remove the HOUSING ASSY UPPER see Section 3 2 2 1 2 Lift the ROLLER ASSY EJECT up and atananglefrom the HOUSING ASSY UPPER Note When removing the ROLLER ASSY EJECT the SPRING 500 may pop out HOUSING ASSY UPPER ROLLER ASSY EJECT SPRING 500 Figure 3 4 Removing the ROLLER ASSY EJECT 3 6 Rev A eh LX 300 Service Manual DisassembiyandAssembly 3 2 3 Removing the BOARD ASSY MAIN and PSB PSE 1 Remove the COVER ASSY PRINTER EDGE GUIDE ASSY ribbon cartridge TRACTOR ASSY PLATEN KNOB and optional color upgrade kit 2 Remove the HOUSING ASSY UPPER see Section 3 2 2 3 Discomect the 3 flexible flat cables FFCs and 6 connectors from the BOARD ASSY MAIN and PSB PSE 4 Remove the 4 CBB M3 x 8 screws attaching the shield plate to the main board assembly and PSB PSE the CBB M3 x 8 screw attaching the CS BOARD and the CBC M4 x 8 screw attaching the ground wire of the POWER CABLE 5 Disengage the SHIELD PLATE and BOARD ASSY MAIN and PSB PSE from the GROUNDING PLATE BOARD ASSY MAIN CN7 BOARD ASSY POWER SUPPLY SHIELD PLATE CBC M4x8 Ground Wire ied POWER CABLE Pe GROUNDING PLATE CBB M3x8 Figure 3 5 Removing the SHIELD PLATE Rev A 3 7 Disassembly and Assembly BOO Service Manual 3 2 3 1 Removing the BOARD ASSY MAIN 1 Remove the FFC of the BOARD ASSY PSB PSE from connector CN2 of the BOARD ASSY MAIN NE 2 R
32. Advance Mechanism This section describes how the friction and tractor advance mechanisms feed paper through the printer The paper advance mechanism consists of the PF motor assembly platen driven roller assembly driven roller cover tractor assembly knob PF gear train etc The PF motor assembly can drive the platen both forward and in reverse Friction Advance Method Paper is held by the platen the PF driven roller and the eject roller assembly Turning in the direction of the black arrows the PF motor assembly pinion gear drives the paper advance reduction gear The paper advance reduction gear turns the platen gear PF driven roller and the platen The platen drives the driven roller cover then the driven roller cover drives to eject the paper The paper advances in the direction of white arrows Figure 2 3 shows the friction advance method when the paper is fed through the top paper entrance COVER ROLLER DRIVEN PAPER ADVANCE REDUCTION GEAR MOTOR ASSY PF ROLLER PF DRIVEN KNOB PLATEN GEAR Pinion Gear AA Figure 2 3 Friction Advance Mechanism Rev A 2 3 Operating Principles LX 300 Service Manual Table 2 2 PF Motor Assembly Specifications Category Requirement 4 phase 48 pole PM type stepping motor Drive Voltage 31 5 38 5 VDC Coil Resistance 56 ohms 5 per phase at 25 C 77 F Drive Pulse Frequency 800 900 1000 1200 1300 pps Excitation Method Constant voltage 1 2 phase excitation
33. Diodes Check with Power Off Meter Reading Check from base to collector and from base to PF Motor Driver emitter Neither open nor shorted Q11 Q12 Q13 Reverse leads and test again from base to collector or Q14 Emitter and base are marked on the main board base to emitter assembly 5 2 Rev A PRACA LX 300 Service Manual Troubleshooting Table 5 4 Motor Coil Resistance Test Points Test Method Set Meter to Ohms Disconnect Number Motor from Main Board and Check it with Printer Power Off Motor Common Sonnector Pin Test Pin Number Number Meter Reading CR Motor Place one lead on pin 3 or 4 and the o Assembly 3 4 other lead on each of the 4 test pins to ac 2 check the two motor phases F PF Motor Place one lead on pin 4 and the other o Assembly 3 4 lead on each of the two test pins to CN3 check the two motor phases CS Motor Place one lead on pin 5 brown and Assembly 5 s the other lead on each of the 4 teat pins 1500 5 at CS Board ES to check the 4 motor phases Pin 3 is a 25 C 77 F Assembly common pin Table 5 5 Sensor Test Points x C Test Method SEN nap Set Meter to Ohms Check Printer with Method Reading u Power Off Place one lead on pin 1 and the other Meter should toggle between DE Sense lead on pin 2 Toggle the sensor position open and short Closed active Place one lead on pin 1 and the other PE sensor
34. EPSON TERMINAL PRINTER LX 300 SERVICE MANUAL EPSON 4003276 PRECAUTIONS Precautionary notations throughout the text are categorized relative to 1 personal injury and 2 damage to equipment DANGER Signals a precaution which if ignored could result in serious or fatal personal injury Great caution should be exercised in performing procedures preceded by DANGER Headings WARNING Signals a precaution which if ignored could result in damage to equipment The precautiomry measures itemized below should always be observed when performing repair maintenance procedures DANGER 1 ALWAYS DISCONNECT THE PRODUCT FROM BOTH THE POWER SOURCE AND PERIPHERAL DEVICES PERFORMING ANY MAINTENANCE OR REPAIR PROCE DURE 2 NO WORK SHOULD BE PERFORMED ON THE UNIT BY PERSONS UNFAMILIAR WITH BASIC SAFETY MEASURES AS DICTATED FOR ALL ELECTRONICS TECHNICIANS IN THEIR LINE OF WORK 3 WHEN PERFORMING TESTING AS DICTATED WITHIN THIS MANUAL DO NOT CONNECT THE UNIT TO A POWER SOURCE UNTIL INSTRUCTED TO DO SO WHEN THE POWER SUPPLY CABLE MUST BE CONNECTED USE EXTREME CAUTION IN WORKING ON POWER SUPPLY AND OTHER ELECTRONIC COMPONENTS WARNING 1 REPAIRS ON EPSON PRODUCT SHOULD BE PERFORMED ONLY BY AN EPSON CERTIFIED REPAIR TECHNICIAN 2 MAKE CERTAIN THAT THE SOURCE VOLTAGE IS THE SAME AS THE RATED VOLT AGE LISTED ON THE SERIAL NUMBER RATING PLATE IF THE EPSON PRODUCT HAS A PRIMARY AC RATING DIFFERENT FROM AVAILABLE POWER SOURCE DO
35. FT HOUSING LOWER C B O SCREW M4x 8 C B B SCREW M3x 8 C B B SCREW M3x 10 C B B SCREW M4x 12 C B USCA C M3x 8 JACK SOCKET JACK SOCKET C B USCA C M3x 10 GUIDE STACKER STACKER COVER HEAT SINK BOARD ASSY MAIN BOARD ASSY VF BOARD ASSY PSB PSE WIRE HARNESS POWER CABLE ASSY POWER CABLE ASSY POWER CABLE ASSY PRINTER MECHANISM M 3G10 FRAME LEFT FRAME RIGHT MOTOR PF 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 Description DETECTOR LEAF B1 HARNESS TR LEVER DISENGAGE COMPRESSION SPRING 200 TRACTOR REDUCTION GEAR PAPER FEED REDUCTION GEAR C B B SCREW M3x 8 PLAIN WASHER 5 2 x0 3X 10 LEVER ASSY PLANETARY PAPER GUIDE UPPER ROLLER PF DRIVEN PAPER GUIDE LOWER PAPER GUIDE SUPPORT FRAME BASE SPURGEAR 13 2 COMBINATION GEAR 5 1 16 2 RACHET RD COVER RD TIMING BELT BELT TENSION SPRING PULLEY ASSY DRIVEN MOTOR CR PULLEY DRIVE BELT PULLEY FLANGE PLAIN WASHER RETAINING RING TYPE E 2 3 CARRIAGE ASSY GROUNDING PLATE HEAD SHAFT ASSY CR GUIDE GROUNDING PLATE SHAFT CR OIL PAD DETECTOR PE PLATEN BUSHING 11 PLAIN WASHER RETAINING RING TYPE E 8 U TYPE 1 1 2X 0 13X 16S NA GROUNDING WIRE PLATEN CABLE HEAD SHEET CABLE HEAD RIBBON MASK HARNESS HP HARNESS PE PAD FRAME BASE SHEET FRAME BASE Rev A Appendix 551 552 553 554 555 556 557 558 559 5
36. G lt a MODEL Tus 2 EPS 23 D 00 0060100 ASSY 212 ma SPAT TN UM u av Bzo 6 5 REEC 4 Sas 2 digo eio logi SE Fa I 2597 uz apt 9 1 zt m 23 z Ap 9T visas Z so sal 53 a 18 s u gt 5 zs N on ee zai 4 19 5 mA 2 162 CMK P2X ot gid zsaz 3 esaz C130 PSE 35 coe sam 72 MODEL 5 23E8 180 o w Figure A 6 C130 PSB PSE Board Assembly Component Layout Rev A LX 300 Service Manual A 4 EXPLODED DIAGRAM Figure A 7 LX 300 Exploded Diagram 1 Appendix LX 300 Service Manual Figure A 8 LX 300 Exploded Diagram 2 Rev A A n LX 300 Service Manual Description Ref No 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 131 132 133 135 200 250 300 410 411 412 500 501 502 503 12 Table 10 Part No Reference Table HOUSING ASSY LOWER INSULATOR INSULATOR SHIELD PLATE COVER ASSY PRINTER ROLLER DRIVEN HOLDER ROLLER DRIVEN COMPRESSION SPRING 73 COVER ROLLER DRIVEN EDGE GUIDE ASSY HOUSING UPPER SHEET PANEL LOGO PLATE KNOB COVER BOTTOM COVER CONNECTOR CS SHIELD PLATE UF GROUNDING PLATE LABEL POSITION HEXAGON NUT C B C LAMITITE M3x 8 SHAFT HOUSING LOWER SHA
37. MOTOR ASSY CS 4 Release the clip that attaches the HOLER CARTRIDGE COLOR to the color ribbon sensor 5 Remove the color ribbon sensor connector from the BOARD ASSY CS COVER CS BOARD ASSY CS CBB M3x8 Color Ribbon Sensor E ring 4 MOTOR ASSY CS GEAR CAM CS LEVER CS CBS M3x5 HOLDER CARTRIDGE COLOR Figure 3 20 Disassembling the Optional Color Upgrade Kit Rev A 3 19 CHAPTER 4 Adjustments Table of Contents 4 1 ADJUSTING THE PRINTER MECHANISM 4 1 4 1 1 Platen Gap 4 1 4 2 DEFAULTS MACHINE INFORMATION SETTINGS AND BIDIRECTIONAL ADJUSTMENT 4 2 4 2 1 Default Settings wa EX eee Z 4 2 4 2 2 Bidirectional 4 4 List of Figures Figure 4 1 The Flowchart of the Platen Gap Adjustment 4 1 Figure 4 2 The Bidirectional Pattern 4 4 LX 300 Service Manual Adjustments 4 1 ADJUSTING THE PRINTER MECHANISM This section describes the adjustments you may need to make to the printer mechanism 4 1 1 Platen Gap Adjustment If you have rotated or reassembled the CR guide shaft assembly or the parallelism adjustment bushing or if printing is abnormal you must adjust the platen and the printhead 1 NQF BON Set the release lever to the friction position Remove the upper housing assembly see Section 3 2 1 Set the ga
38. NOT CONNECT IT TO THE POWER SOURCE 3 ALWAYS VERIFY THAT THE EPSON PRODUCT HAS BEEN DISCONNECTED FROM THE POWER SOURCE BEFORE REMOVING OR REPLACING PRINTED CIRCUIT BOARDS AND OR INDIVIDUAL CHIPS 4 ORDER TO PROTECT SENSITIVE MICROPROCESSORS AND CIRCUITRY USE STATIC DISCHARGE EQUIPMENT SUCH AS ANTI STATIC WRIST STRAPS WHEN ACCESSING INTERNAL COMPONENTS 5 REPLACE MALFUNCTIONING COMPONENTS ONLY WITH THOSE COMPONENTS BY THE MANUFACTURE INTRODUCTION OF SECOND SOURCE ICs OR OTHER NONAPPROVED COMPONENTS MAY DAMAGE THE PRODUCT AND VOID ANY APPLICABLE EPSON WARRANTY PREFACE This manual describes functions theory of electrical and mechanical operations maintenance and repair of LX 300 The instructions and procedures included herein are intended for the experience repair technician and attention should be given to the precautions on the preceding page The chapters are organized as follows CHAPTER 1 PRODUCT DESCRIPTION Provides a general product overview lists specifications and illustrates the main components of the printer CHAPTER 2 OPERATING PRINCIPLES Describes the theory of printer operation CHAPTER 3 DISASSEMBLY AND ASSEMBLY Includes a step by step guide for product disassembly and assembly CHAPTER 4 ADJUSTMENTS Includes a step by step guide for adjustment CHAPTER 5 TROUBLESHOOTING Provides Epson approved techniques for adjustment CHAPTER 6 MAINTENANCE Describes preventive maintenance technique
39. OBE signal The system IC outputs a BUSY signal automatically to stop the host computer from sending further data The CPU block reads the data latched in the gate array block periodically without generating an interrupt STSTEM IC PARALLEL F yllllylll Figure 2 20 Parallel Interface Block Diagram Figure 2 21 shows the serial interface circuit block diagram The serial interface conforms to EIA 232D RXD is data received by the serial 1 0 of the CPU block from the host computer via driver receiver IC2 Data is transmitted to an input buffer in the svstem IC from the CPU block Printing starts when a CR code is received or when the input buffer is filled Driver Reciver IC2 SYSTEM IC ICI TXD 6 L 36 pco DTR 4 amp S pps RXD Pcl CTS PB4 Figure 2 21 Serial Interface Block Diagram Rev A 2 17 2 3 10 EEPROM Control Circuit Figure 2 22 shows the EEPROM control circuit block diagram The EEPROM 5 contains such information as the top of form position The EEPROM is non volatile memory so information is not lost if the printer is powered off Since the EEPROM is a serial I O type device the CPU converts 8 bit data into serial data 5V SYSTEM IC ICI EEPROM 5 Pg 9 1 cs pps 2 cK PBO DI pai Figure 2 22 EEPROM Control Circuit Diagram 2 3 11 CS Motor Assembly Circuit Figure 2 23 shows a block diagram of the CS motor assembly circuit in
40. ONT button to change the language and press the LF FFbutton to select 4 Press the FONT button again after selecting a language The printer prints help text to guide you in setting defaults The printed instructions include submenu tables listing all the settings you can change and showing you how the control panel lights appear for each selection 5 To change the settings press the FONT button to move down and press the LF FF button to 10 move up in the menu of options shown below The printer beeps once each time you press the FONT button while you are in this menu Table 1 19 Default Options FONT Light 1 FONT Light 2 PAUSE Light __ Setting Submenu Blinks OFF OFF Character spacing _ Table 1 20 Bins ON OFF j Shapeofzro Table 1 21 OFF Blinks OFF __ Skipoverperforation Table 1 22 ON Bins OFF Charactertable Table 1 23 Blinks OFF Autolinefeed Table 1 24 Blinks ON Page length Table 1 25 Blinks ON ____ Table 1 26 ON Tractor Table 1 27 interface Table 128 ON Bitre Table 1 29 Blinks Parity Table 1 30 Blinks Datalengh Table1 31 When you reach the setting you want to change press the PAUSE button once The printer automatically enters the submenu for that setting Blinks Blinks OFF Press the FONT button to move the through the settings in the submenu The printer beeps twice each tim
41. P Cross recessed bind head tapping screw with fiat washer CF Cross recessed countersunk screw Rev A 3 3 Disassembly and Assembly LX 300 Service Manual 3 2 DISASSEMBLY AND ASSEMBLY This section describes the procedures for disassembling and assembling the main components of the printer When the procedure for installing a component is simply the reverse of the procedure for removing the component no description of the installation is given Arty points of special concern follow the description of the procedure CAUTIO e Before disassembling any part of the printer note the warnings in Section 3 1 e Before disassembling any part of the printer remove the paper and the ink ribbon Disassembly includes the following seven procedures Removing the printhead Removing the HOUSING ASSY UPPER Removing the BOARD ASSY MAIN and PSB PSE Removing the Printer Mechanism Removing the BOARD ASSY INTERFACE Disassembling the ROLLER ASSY DRIVEN Disassembling the Optional Color Upgrade Kit NOTE WON Refer to the diagrams in the appendix to see how components fit together Section Page Description Unplug the power cable and the interface cable from the printer 21 3 5 i326 2 9 18 Removing the ROLLER ASSY DRIVEN 3221 73 6 a222 ad O Removing the HO USING ASSY UPPER Removing the ROLLER ASSY EJ ECT Removing the BOARD ASSY MAIN and PSB PSE 3 2 4 3 9 Removing the rinter Mechanism
42. Push Tractor Method When the push tractor method is used with the rear entrance the torque generated by the PF motor assembly is transmitted to the push tractor gear through the PF motor assembly pinion gear the paper advance reduction gear and the tractor transmission gear When the PF motor assembly pinion gear turns in the direction of the black arrows the tractor gear rotates in the direction of the black arrow and thus feeds the paper into the printer The paper is advanced by the platen which is also driven by the PF motor assembly through the gear train Continuous Paper Push Tractor TRACTOR DEI ECrOR PE TRANSMISSION GEAR TRACTOR GEAR PLATEN 0 PAPER ADVANCE COVER ROLLER REDUCTION GEAR DRIVEN PLATEN GEAR Pinion Gear MOTOR ASSY PF Figure 2 4 Push Tractor Paper Advance Mechanism 2 4 Rev A LX 300 Service Manual Operating Principle Pull Tractor Method The pull tractor advances paper in basically the same way as the push tractor When the push tractor is installed at the paper exit instead of paper entrance the tractor functions as a pull tractor instead of a push tractor pulling the paper out of the printer mechanism Figure 2 5 shows the pull tractor advance mechanism Continuous Paper COVER ROLLER DRI y Tractor PULL TRACTOR TRANSMISSION GEAR PAPER ADVANCE PLATEN REDUCTION GEAR MOTOR ASSY PF Pinion Gear Figure 2 5 Pull Tractor Paper Advance Mecha
43. Q LOWER 1018296 Printer Mechanism HOUSING LOWER Figure 3 8 Removing the Printer Mechanism Rev A 3 9 Disassembly and Assembl LX 300 Service Manual 3 2 4 1 Removing the MOTOR ASSY PF 1 Remove the printer mechanism see Section 3 2 4 2 Remove the GROUNDING SPRING PLATEN that secures the platen shaft see Section 3 2 43 3 Remove the CBB M3 x8 screw attaching the MOTOR ASSY PF to the FRAME LIGHT 4 Release the clip holding the MOTOR ASSY PF from the FRAME RIGHT 5 Remove the MOTOR ASSY PF from the FRAME RIGHT du SPRING 200 PLANE WASHER LEVER DISENGAGE PAPER ADVANCE TRACTOR FRAME RIGHT TRANSMISSION GEAR CBB M3x8 MOTOR ASSY PF Figure 3 9 Removing the MOTOR ASSY PF 3 10 Rev A LX 300 Service Manual Disassembly and Assembly 3 2 4 2 Removing the MOTOR ASSY CR 1 Remove the Printer Mechanism see Section 3 2 4 2 Remove the BELT TENSION SPRING from the hook on the MOTOR ASSY CR and the hook on the FRAME BASE 3 Remove the TIMING BELT from the PULLEY DRIVE 4 Remove the E ring PULLEY WASHER BELT PULLEY FLANGE and PULLEY DRIVE from the MOTOR ASSY CR 5 Rotate the MOTOR ASSY CR counterclockwise and remove it TIMING BELT E ring 1 i PULLEY WASHER 2 BELT PULLEY FLANGE PULLEY DRIVE BELT TENSION SPRING FRAME RIGHT Figure 3 10 Removing the MOTOR ASSY CR Rev A 3 11 Disassembly and Assembly LX 300 Service Manual 3 2 4 3 Remo
44. age normal 120V version is 103 5 132V 230V version is 198 264V YES V Are the fuses YES F1 on BOARD ASSY NO NO NO Use correct AC input voltage No fluctuation from AC voltage range is permitted Replace the fuse PSB PSE blow NO Measure the VP 35VDC at pin 1 and 2 of CN2 on BOARD ASSY PSB PSE Is output voltage normal Y E Replace the BOARD ASSY PSB PSE Measure the VL 9VDC at pin 4 and 5 of CN 2 on the BOARD ASSY PSB PSE Is output Replace the BOARD oltage normal ASSY MAIN S YES Verify each motor s coil resistance in Table 54 the resistances Replace necessary unit Replace the BOARD ASSY MAIN RA Rev A 5 5 Troubleshooting 2 Abnormal carriage operation Are connectors CN2 CN8 connecting the BOARD ASSY MAIN and the Printer Mechanism YES Dose the carriage move to the home position Replace the BOARD ASSY MAIN 5 6 LX 300 Service Manual Reinsert connectors correctly NO Is the fault corrected See the troubleshooting item for the PRINTER MECHANISM Section5 4 Rev A N IN eg V LX 300 Service Manual Troubleshootina 3 Printing is faulty during self test but carriage operation is normal NO Uss correct AC input voltage No fluctuation from AC voltage range is permitted AC input voltage normal 120V version is 103 5 132V 230V version
45. annot accept more data HIGH indicates paper out This signal is effective ic only when the ERROR signal is LOW Always HIGH output Pulled up to 5V through 3 3 resistor If the signal is LOW when the printer is initialized a line feed is automatically performed upon receipt of the CR code auto LF 7 Not used Signal ground t Chassis ground In the printer chassis ground and signal ground E Description i are short circuited A HIGH level means that printer power is on Signal ground Input for printer initialization Pulse width 50 ps minimum active LOW i i wt LOW indicates that some error has occurred in the printer i i Signal ground Pulled up to 5V through 1 resistor i Ignored AE s signal as viewed from the printer Rev A 42 LX 3 IO Service Manual Product Description 1 3 2 Serial Interface Specifications The LX 300 is equipped with an 8 bit serial interface standard Data format EIA 232D serial Synchronization Asynchronous Handshaking By DTR signal and X ON X OFF protocol DTR and X ON X OFF Protocol State Buffer Space Dm X ON X OFF Less than 256 bytes of X OFF More than 512 bytes On X ON ETX ACK Protocol Buffer Space Response Code Less than 256 bytes 256 bytes or more Word length Start bits 1 bit Data bits 7 or 8 bit selectable Parity bit O or 1 b
46. ape of zero Not slashed These are the factory defaults programmed into this printer 12 Press Y then Enter to confirm these settings and return to the initial menu 13 Exit the program by pressing3 then Enter 14 The following message appears on the display Any setting value specified within this program is not stored in the EEPROM until you turn the printer OFF Turn the printer OFF now 15 Turn the printer off to store the defaults shown above into the EEPROM on the main board assembly Note If you have replaced the main board assembly you must also perform the bidirectional adjustment procedure after completing this procedure Rev A 43 Adjustments LX 300 Service Manual 4 2 2 Bidirectional Adjustment This section describes the adjustment procedure necessary when the LX 300 printer is reassembled rm or when parts are reinstalled or replaced This procedure is also necessary if the main board ae assembly has been replaced Notes When the main board is replaced perform the Defaults amp Machine Information Settings procedure first then perform the Bi D Adjustment procedure e The printer cover must be installed when you perform the Bi D adjustment Do not perform the Bi D Adjustment procedure if the input voltage is fluctuating heavily The optional color upgrade kit must be removed when you perform the Bi D adjustment 1 Connect the printer to a PC 2 Turn the printer on 3 Load paper into the
47. ard Italic USA France Germany UK Denmark l Sweden Italy Spain 1 PC437 850 860 861 863 865 BRASCII Abicomp Character table NLSP Italic USA France Germany UK Denmark 1 Sweden Italy Spain 1 PC437 850 852 853 855 857 869 07 Greek ISO Latin IT 150 8859 7 Code MJK Mazowia Bulgaria Page length 11 12 8 5 70 6 inches Auto tear off On Off Tractor Single Double interface Auto selection 30 sec wait Parallel Serial Bit rate serial I F 300 600 12 MI 2400 4800 9600 19200 bps Parity bit serial I F None Odd Even Data length serial I F Z bits 8 bits ETX ACK serial I F Disabled Enabled Note Underlines show factory setting 1 16 Rev pe Tina LX 300 Service Manual Product Description 1 4 8 2 Changing the Default Settings You can change some parameters that the printer refers to at printer initialization 1 To enter the default setting mode turn on the printer while holding down the FONT button The printer prints out the firmware version If paper is not loaded insert a sheet of paper 2 The printer automatically loads the paper and prints a table of languages to choose from English French German Italian and Spanish The Footlights indicate the currently selected language as shown in the table below Table 1 18 Font Lights and Language Selection FONT Light 1 FONT Light 2 Language English French Blinks Spanish 3 Press the F
48. aten Gap Adjustment Mechanism Rev A 2 9 2 2 POWER SUPPLY OPERATION The printer can be powered by either of two power supply boards the C130 PSB 120V board assembly or the C130 PSE 230V power supply The function of these two boards is the same except for a difference in primary circuitry e power supply board outputs the DC current necessary to drive the printer control circuits and drive mechanism Table 2 6 shows the input voltages and fuse ratings for these boards Table 2 6 Power Supply Board C130 PSB C130 PSE Input Voltage Fuse F1 Rating 2 5A 125V 250V 198 284 VAC 1 25A 1250V 2 2 1 Power Supply Overview The power supply board has two power outputs for use in the various control circuits and drive mechanisms Table 2 7 lists the circuitry and the units that are driven by the two DC output supply voltages 2 10 35 v VP Table 2 7 Power Supply Output Voltages and Applications Voltage Applications CR motor drivers PF motor drivers Printhead drivers CS rnotordrivers I Main board assembly logic circuitry Various sensors Control panel LED PF motor CS motor hold Rev A c Ia LX 300 Service Manual Operating Principle 2 2 2 Power Supply Circuit Operation Figure 2 11 shows a block diagram of the power supply circuitry When AC power is supplied to the printer from an external power source a filter circuit removes the noise The AC voltage then undergoes full w
49. ave rectification and is smoothed to produce the direct current supply voltage This voltage is fed through a switching circuit and secondary smoothing circuit to produce the stepped down 35 VDC supply A 35V line voltage detector ZD51 and PCI circuit is connected to the switching circuit This feedback control arrangement ensures that the 35 VDC supply is kept stabilized A 9 VDC supply is created by putting the 35 VDC line through the 9 VDC power supply circuit This circuit further steps down the 35 VDC voltage and outputs a stabilized supply The 9 VDC output is stabilized to 5 VDC using the regulator on the C130 MAIN board assembly There are several circuits to protect the supply circuits and avoid danger The 9 VDC line contains a voltage overload protection circuit The 9V voltage overload protection circuit 2053 Q82 and PC1 cuts the supply if the voltage reaches or exceeds 11 VDC It stops switching circuit operation which stops the output from the 35 VDC line The 35 VDC line has a voltage overload protection circuit The 35 VDC voltage overload protection circuit ZD52 Q82 and 1 cuts the supply if the voltage reaches or exceeds 36 VDC It stops switching circuit operation which stops the output from the 35 VDC line Switching Smoothing Circuit Circuit 9VDC Stabilization circuit 35 VDC VP Full Wave Smoothin Rectification Circuit 9 Filter Circuit voc line AC Line
50. d the gear trains The ribbon driving gear rotates counterclockwise no matter what direction the carriage moves because a planetary gear is used in the gear linkage Table 2 3 Ribbon Advance Gear Linkage Direction of Carriage Movement Gear Linkage Left to right Belt driven pulley gt Gear 1 Gear 2 indicated by the black arrow Ribbon driving gear Right to light Belt driven pulley Gear 1 Gear 3 indicated by the white arrow Gear 4 gt Ribbon driving gear The ribbon brake spring attached to the exit of the cartridge case prevents slack in the ribbon and keeps the ribbon tension at an appropriate level The ribbon mask prevents the ribbon from brushing against the paper Ribbon Advance Roller y Ink Ribbon Ribbon Pressure Roller RIBBON MASK B cont PERRA Figure 2 8 Ribbon Advance Gear Linkage Rev A 2 7 2 1 5 Ribbon Shift Mechanism This printer can be equipped with a color upgrade kit to print in color The printer performs color printing unidirectionally The option is composed of the color ribbon shift mechanism The color ribbon feed mechanism is shared in common with black ribbon feed mechanism and the shift mechanism shifts the ribbon cartridge up and down Table 2 2 shows the CS motor assembly specifications The motor control system is open loop so that when the color is being changed the positioning is controlled by stepping pulse Table 2 4 CS Motor Assembly Specifications Ca
51. ds greater than 0 27 inch 6 8 mm Push tractor feed Set the release lever to the tractor position Donot perform reverse feeds greater than O 27 inch 6 8 mm During printing ofiabels never perforrnreverse feeding After printing labels do not eject them from the rear Pull tractor feed 0 Remove the tractor unit from the push position and mount it in the pull position Do not perform reverse feeding The adjust lever must be set to proper position for the paper thickness as shown below Table 1 3 Adjust Lever Settings Lever Position Paper Thickness 0 065 mm 0 16 mm 0 0026 in 0 0063 in 0 16 mm 0 25 mm 0 0063 in 0 0098 in 0 25 mm 0 48 mm 0 0098 in 0 0189 in Rev A 1 3 1 2 1 2 Paper Specifications Table 1 4 Specifications for Cut Sheet Paper Manual Insertion Width 182 mm 257 mm 7 2 in 10 1 in 182 mm 364 mm 7 2 in 14 3 in 0 065 mm 0 14 mm 0 0025 in 0 0055 in Weight 52 3 90 g m 14 24 Ib Quality Plain paper recycled paper Table 1 5 Specifications for Cut Sheet Paper CSF A4 W x L 210 mm 8 3 in x 297 mm 11 7 in Letter W x L 216 mm 8 5 in x 279 mm 11 0 m 0 065 mm 0 14 mm 0 0025 in 0 0055 in Weight 64 90 g m 17 24 Ib QuaMy Plain paper recycled paper Table 1 6 Envelope Specifications NO 6 Width 166 mm x Length 92 mm 6 5 in x 3 6 in No 10 Width 240 mm x Length 104 mm 9 5 in x 4 1 in Thickness 0 16 mm
52. e you press the FONT button while in a submenu When the lights match your desired setting press the PAUSE button to make your selection The printer saves the new setting and returns to the menu shown above Repeat steps 5 through 8 for each additional setting you want to change or skip to step 10 to exit the printer s default setting mode When you are finished turn the printer off Any settings you have made remain in effect until you change them again Rev A 1 17 Product Description LX 300 Service Manual Table 1 20 Character Spacing FONT Light 1 FONT Light 2 PAUSE Light Character Spacing or or or ON ON 12 cpi Table 1 21 Shape of Zero FONT Light 1 FONT Light 2 PAUSE Light Space of Zero 0 Table 1 22 Skip Over Perforation FONT Light 1 FONT Light 2 PAUSE Light Skip Over Perforation Table 1 23 Character Table Italic US talic France Germany Italic UK ON ON OFF Italic Denmark 1 Italic Denmark 1 Blinks ON OFF Italic Sweden Italic Sweden OFF Blinks OFF Italic Italy Italic Italy Blinks Blinks OFF Italic Spain 1 Italic Spain 1 OFF OFF ON Pc 437 PC 437 ON OFF ON PC 850 PC 850 Blinks OFF ON PC 860 PC 852 OFF ON ON Pc 861 PC 853 ON ON ON PC 863 Pc 855 Blinks ON ON PC 865 PC 857 OFF Blinks ON BRASCII PC 866 ON Blinks ON Abicomp Blinks Blinks ON OFF OFF Blinks ON OFF Blinks Blinks OFF Blinks OFF ON Bli
53. emove the CBC M3 x8 screw and the3 CB USCAC M3 x 8 3 Remove the BOARD ASSY MAIN 3 2 3 2 Removing the BOARD ASSY PSB PSE 1 Remove the FFC for the BOARD ASSY PSB PSE from connector CN2 on the BOARD ASSY MAIN 2 Remove the CB USCA C M3 x 10 screw and 2 CB USCA C M3 x 8 ssrews 3 Remove the BOARD ASSY PSB PSE e When replacing the BOARD ASSY MAIN bend the LED lead wires parallel to the BOARD ASSY MAIN see Figure 3 7 The SHIELD PLATE is easily bent be careful when tightening the screws that attach it to the BOARD ASS Y MAIN and PSBIPSE CB USCA C M3x8 CB USCA C M3x8 CBC M3x8 CB USCA C M3X10 FFC SHIED PLATE CBB M3x8 BOARD ASSY MAIN Figure 3 6 Removing the BOARD ASSY MAIN and PSB PSE BOARD ASSY MAIN BOARD DOW LED Figure 3 7 Bending the LED Lead Wires 3 8 Rev A LX 300 Service Manual Disassembly and Assembly 3 2 4 Removing the Printer Mechanism 1 Remove the COVER ASSY PRINTER EDGE GUIDE ASSY ribbon cartridge TRACTOR ASSY PLATEN KNOB and optional color upgrade kit 2 Remove the HOUSING ASSY UPPER see Section 3 2 2 3 Remove the connectors and FFCs from the BOARD ASSY MAIN 4 Remove the3 SHAFT HOUSING LOWER 1018296 5 Remove the SHAFT HOUSING LOWER 1015457 Note that this shaft is different from the three described in the previous step 6 Remove the printer mechanism SHAFT HOUSING 9 7 SHAFT HOUSING LOWER 10154
54. en GapAdjustment 2 9 Figure 2 11 Power Supply Circuit Block 2 11 Figure 2 12 Control Circuit Block 2 12 Figure 2 13 Power On Reset Circuit Diagram 2 13 Figure 2 14 HomePositionSensorCircuit Diagram Figure 2 15 PaperEndSensor Circuit 2 14 Figure 2 16 Release Lever Position Sensor Circuit Diagram 2 14 Figure 2 17 Carriage Motor Driver Circuit 2 15 Figure 2 18 Paper Feed Motor Driver Circuit Diagram 2 16 Figure 2 19 Printhead Driver Circuit 2 16 Figure 2 20 Parallel Interface Block 2 17 Figure 2 21 Serial interface Block 2 17 Figure 2 22 EEPROM Control Circuit 2 18 Figure 2 23 CSMotorAssemblyCircuit 2 18 Figure 2 24 Color Ribbon SensorCircuit 2 19 List of Tables Table 2 1 CR Motor Assembly 2 2 Table 2 2 PF Motor Assembly Specifications 2 4 Table 2 3 Ribbon Advance Gear 2 7 Table 2 4 CS Motor Assembly
55. en paper width of 254 mm 10 is used Figure 1 5 Printable Area for Continuous Paper 14 Rev A LX 300 Service Manual Product Description Roll paper 213 mm 219 mm 8 38 8 627 203 2 mm 87 maximum i 2 55 Printable Area BE 2 E io e 2 m 9 8 mm 0 39 or more when a paper widthof216 3 mm is used Figure 1 6 Printable Area for Roll Paper 1 2 1 4 Ribbon Specifications Ribbon cartridge mono 39750 8758 sub cartridge Ribbon cartridge color 5015073 Ribbon color Black magenta cyan yellow Black ribbon life 3 million characters 14 dots character Color ribbon life Black 1 million characters 14 dots character Magenta 0 7 million characters 14 dots character Cyan 0 7 million characters 14 dots character Yellow 0 5 million characters 14 dots character Rev A Product Description LX 300 Service Manual 1 2 1 5 Electrical Specifications Table 1 10 Electrical Specifications Description 120 V Version 220 240 V Version Rated voltage 220 240 VAC 103 5 132 VAC 198 264 VAC 49 5 60 5 Hz Rated current Power mnsumption 30 W self test in 10 cpi draft Insulati ist 1 500 VDC bet appl ina SODY ee nsulation resistance applying etween ssisjeen line and chassis AG ine ssis 1000 VAC ma for 1 minute or 1500 VAC rms for 1 minute Dielectric strength and chassis between AC l
56. h PC855 Cyrillic PC857 Turkish PC866 Russian PC869 Greek PC437 Greek ISO Latin IT Turkish 150 8859 7 Greek Code MJK Czecho Slovakia MAZOWIA Polland Bulgaria Bulgaria 0 Supported EsC r 4KB 13 international character sets See the table below Table 1 12 Character Tables 0 0 PC437 US Standard Europe oF 0 0 x pee x _ 0 x 8 4 x _ 4 x NEZ aa o C 1 poe o o o o o Nem o NE WEEK o NEN NE o X o x Not supported NSLP National Language Support Bitmap fonts Character size Character matrix Print mode Draft mode NLQ mode Printing speed Printable columns Rev A EPSON NLQ Roman EPSON NLQ Saris Serif EPSON DRAFT 10 5 points Draft 10 cpi 11 horizontal dots 9 vertical dots NLO 10 cpi 23 horizontal dots 18 vertical dots Double width Condensed Emphasized Double strike Underlined Italics Super subscript Double width Emphasized Underlined Italics Super subscript See Table 1 13 See Table 1 13 1 9 Product Description LX 300 Service Manual Notes Draft Tdi Rei Draft condensed Draft emphasized 120dii 72dp Table 1 13 Printing Speed Printing Mode Ch rsctar Printable Print Speed cps 5 Pitch Columns Monochrome Draft cri 80 2200165 165 1 65 Draft Lue e 264 198 198 198 Draft condensed i 188 141
57. he HOUSING LOWER 4 Remove the 2 CBB M3 x 8 screws attaching the BOARD ASSY NTERFACE to the HOUSING LOWER 5 Remove the COVER BOTTOM and the BOARD ASSY INTERFACE COVER BOTTOM CBT M3x10 CBB M3x8 CBB M3x8 d HOUSING LOWER Figure 3 18 Removing the BOARD ASSY INTERFACE Rev A 3 17 Disassembly and Assembly LX 300 Service Manual 3 2 6 Removing the ROLLER ASSY DRIVEN 1 Remove the COVER PRINTER 2 Remove the CF M2 6 x 8 screw attaching the ROLLER ASSY DRIVEN 3 Remove the ROLLER ASSY DRIVEN CF M2 6X8 ROLLER DRIVEN SPRING 73 R SS HOLDER ROLLER DRIVEN COVER ROLLER DRIVEN COVER PRINTER R Figure 3 19 Removing the ROLLER ASSY DRIVEN seg ao LX 300 Service Manual Disassembly and Assembly 3 2 7 Disassembling and Assembling the Optional Color Upgrade Kit 3 2 7 1 Removing the MOTOR ASSY CS 1 Remove the CBB M3 x 8 screw attaching the MOTOR ASSY CS to the COVER CS 2 Release the 2 clips attached to the COVER CS 3 Remove the MOTOR ASSY CS with the BOARD ASSY CS from the COVERS 3 2 7 2 Remove the GEAR CAM CS 1 Remove the MOTOR ASSY CS see Section 3 2 7 1 2 Remove the E ring 3 from the color cam shaft 3 Remove the GEAR CAM CS 3 2 7 3 Removing the Color Ribbon Sensor 1 Remove the MOTOR ASSY CS and the BOARD ASSY CS see Section 3 2 7 1 2 Remove the E ring 4 from the cartridge holder shaft 3 Remove the HOLDER CARTRIDGE COLOR from the
58. he iron core vanishes The actuating plate returns to its original position the position before coil was energized with spring action The dot wire also returns to its original position This is the sequence used to print a single dot The mechanism is equipped with a built in thermistor for head temperature detection The temperature detected by the thermistor is converted to an electric signal and fed back to the control circuit Wire Hesetting Sprin Ribbon Ribbon Mask Paper Platen Stopper Dot Wire Actuating Plate C Iron Core Head Driving Coil Actuating Spring Figure 2 1 Printhead Operation Principles Rev A 2 1 2 1 2 Carriage Movement Mechanism The carriage movement mechanism consists of the carriage assembly CR motor assembly timing belt driven pulley HP sensor etc The CR motor assembly drives the timing belt The carriage assembly is connected to the timing belt which is moved by the CR motor assembly Figure 2 2 shows the carriage movement mechanism The printer detects the carriage home position with the HP sensor This sensor is the basis for determining the carriage home position The HP sensor informs the CPU of the carnage home position The sensor is ON when the carriage is pushed to the right or left The striker on the carriage actives the sensor to indicate the carriage home position which toggles the sensor to OFF Table 2 1 CR Motor Assembly Specifications Ca
59. he printer off 1 14 Rev A me LX 300 Service Manual Product Description 1 4 3 Hexadecimal Dump Function The hexadecimal dump is a useful tool for troubleshooting data control problems This section describes how to run a hex dump 1 Turn on the printer while holding down the LF FF and FONT buttons 2 If paper is not loaded the printer attempts it either single sheet or continuous paper 3 If the printer cannot load the paper it indicates a paper out error In this case insert paper again and press the PAUSE button 4 The printer waits for data after printing the message Hex dump 5 Received data is printed as both hexadecimal codes and ASCII characters If a corresponding printable character does not exist the printer outputs a period 6 Quit hexadecimal dump printing by pressing the PAUSE button and tumingtheprinter off Note hex dump mode the character table depends on the default setting and 10 cpi draft is selected automatically 1 4 4 Printer Status Indication It describes how this printer indicates status and error conditions using LEDs and the beeper The symbols below describe the frequency of beeper sounds 6 The beeper sounds for 100 rns with an interval of 100 ms between beeps The beeper sounds for 500 ms with an interval of 100 ms between beeps While initialize signal is active PAUSE light is on During initialization PAUSE light blinks and beeper sounds Ready to print
60. hly Is the tractor feeding the paper Paper path _correctly Is the paper path clear of all obstructions Is the platen free of damage L Chackad Not necessary ka 3 ts the ribbon mask free of distortion Checked Not necessary dh Was the self print successful L Checked D Not necessary On line test Was the on line test successful Checked Not necessary Is the platen gap adjusted correctly C Checked Not necessary Checked Not necessary L Checked Not necessary L Chackedn Not necessary Printhead printing Is the bidirectional print position adjusted correctly Have user changeable settings been reset to the default value U Checked 1 Not DD ROM gt Has the ribbon been removed L Checked Not necessary Shipment Have all relevant parts been included in the shipment L Checked LJ Not necessary System upgrade L Chalked L Not necessary 3 2 Rev A LX 300 Service Manual Disassembly and Assembly 3 1 4 Specifications for Screws Table 3 4 lists the abbreviations used in the following sections for small parts such as screws and washers Table 3 4 Screw Abbreviations Abbreviation Part Name CPB Cross recessed pan head B tight screw CBB CBS Cross recessed bind head S tight screw CBC Cross recessed bind head C Lamitite screw CTB Cross recessed bind head tapping screw CB O Cross recessed bind head with outside toothed lock washer CTB
61. ii ES 1 20 PTT 1 20 zitat ndo ok Gottes doa eet or dan bane dtodd 1 20 LX 300 Service Manual Product Deseription 1 1 FEATURES The LX 300 is a small light weight 9 pin serial impact dot matrix color printer suitable for personal use The major features of this printer areas follows Q Fast printing of 10 cpi draft characters at 220 cps Q Compact design saves precious workspace Q Easy to operate panel Q Quiet printing Standard 8 bit parallel interface and EIA 232D serial interface Q Printing of up to 66 lines on A4 size or 62 lines on letter size paper Q Optional color printing usinga color ribbon black magenta cyan yellow Q Detachable push and pull tractor Figure 1 1 shows an exterior view of the LX 300 and Table 1 1 lists the optional units available for the LX 300 Paper supports PZ A nL me LY Paper guide Edge guides Paper release lever Paper feed knob Power switch Paper thickness lever Paper support Tractor Figure 1 1 Exterior View of the LX 300 Table 1 1 Optional Units Model Description Ribbon cartridge monochrome Ribbon cartridge monochrome sub cartridge 5015073 Ribbon cartridge color C80837 Single bin cut sheet feeder C83208 Color upgrade kit C80030 Pull tractor unit 8310 Roil paper holder Rev A 1 1 Product Description LX 300 Service Manual 1 2 SPECIFICATIONS This section
62. ine and chassis 1 2 1 6 Environmental Conditions Table 1 11 Environmental Conditions Description Operating Storage Sto 35 41 95 F 1 20to 55 c 4 131 P 2 30 to 80 RH 21 3 5 to 85 RH 2 3 Resistance to vibration 0 25 G 55 Hz 1 0 50 G 55 Hz 2 1 Operating conditions must be within this range 2 When the printer is in the shipping container 3 Without condensation 1 2 1 7 Reliability MTBF 4000 power on hours POH Printhead life 200 million strokes wire with monochrome ribbon 100 million strokes wire with color ribbon 1 2 1 8 Safety Approvals Safety standards USS version UL1950 with D3 CSA22 2 950 with D3 European version 60950 TUV IEC950 SEMKO DEMKO NEMKO SETI Radio frequency interference U S version FCC part 15 subpart B class B RFI European version _ Vfg 243 VDE0878 part 3 part 30 EN55022 CISPR PUB 22 class B 1 2 1 9 Physical Specifications Dimensions W x D x H 366 x 275 x 132 mm 14 4 x 10 8 x 5 20 inches without pull tractor Weight 4 kg 8 8 lb without pull tractor 1 8 Rev A M LX 300 Service Manual Product Description 1 2 2 Firmware Specifications Control codes Input data buffer Character sets Character tables Character ITALIC 850 Multilingua PC860 Portuguese PC861 Icelandic PC863 Canadian French PC865 Norwegian BRASCII Abicomp PC852 East Europe PC853 Turkis
63. is 198 264V YES Hold down the LF FF button and turn on the printer to start printing the self test Ara the connectors CN2 Is printing 8 connecting the BOARD NO executed ASSY MAIN and the Printer 15 the vertical Are any NO corrected NO dots missing Is the fault corrected YES RNY YES Verify FFCS are properly inserted and have continuity If they are OK replace the Printhead Is the fault corrected Replace the BOARD ASSY MAIN 5 7 4 Abnormal paper feed START NO gt paper loaded Qrrectly YES Load the pape correctly Is the connector CN6 connected correctly NO gt Reinsert the connector CN6 correctly smoothly when tumed NO manualy with the YES Replace the BOARD See the troubleshooting ASSY MAIN items for the PRINTER MECHANISM Sect 5 4 YES See the troubleshooting items for the Printer Mechanism Sect 5 4 Replace the BOARD ASSY MAIN Rev A 2 3 LX 300 Service Manual Troubleshooting 5 Abnormal control panel operation NO the buttons have Replace the HOUSING ASSY UPPER Is the fault corrected Is the fault corrected NO Refer to the other troubleshooting items Rev A 5 9 6 Data sent by the host compute is printed incorrectly 4 E Print the self test Dose the self test Refer
64. it selectable Stop bits 1 bit transmitting 1 bit or more receiving Bit rate 300 600 1200 2400 4800 9600 19200 bps selectable Logic level MARK logical 1 3 V to 25 V SPACE logical O 3 to 425v Parity check Odd even or no parity bit selectable Connector FIA standard 25 pin D SUB female comector Table 1 16 Signal and Connector Pin Assignments for Serial Interface Pin No RB JRE Name 110 Description FG Chassis ground L3 mem ea Transmit serial data 3 Receive serial data 4 RTS RS This signal is always at the positive EIA level 5 CTSCS Ignored 7 Return path for data and control signals This signal is at the positive EIA level when the printer is ready to accept data entry and at the negative EIA level when the printer is not ready to accept data entry No connection not used Thel O column indicates the direction of the signal as viewed from the printer Rev A 1 13 1 4 OPERATING INSTRUCTIONS This section describes control panel operation functions self test hexadecimal dump demonstration functions and printer initialization methods 1 4 1 Control Panel Operation The printer control panel contains three non lock type push buttons and three LED indicators for easy operation of the various printer functions Buttons Lights LN Light Roman O O Saris Serifo e Drafte Draft Condensed 12 YY W Micro Adjust Figure 1 8 Panel Apperance Pa
65. n Assignments CN9 CN10 CN11 x36 4435 VDC CS HOLD 45V DC CS motor assembly Phase A CS motor assembly Phase A CS motor assembly Phase B Rev A LX 300 Service Manual Appendix 995 180 9 S2H 2502 93 2 7 OZABFL_0 Og ONO LS 99 iV 280 22452 502 5 1 698 99 80 s37 180 537212 0 s ZEO 2 CSZH saz 006 9S8 zivio HOL 258 asevnee 7 952 7050311 550 HI YGLOLIHT 94 el z u O9EZWIN A 621 ssw 90001 85 2 M 77 28 MS 0 3 5 0 SU LI AOS 00 47 152 1619 8W4 150 2 021 001 Oo 1 No 4 XNISIV3H 1 AQSZ 10 ASZ1 VS Z 2 10SZSd 7 MS 0 00 8 MS 6 t zu KL 9 7ASZ 4 29 UOAE Ol 2207 3H u 7027 93 0 40022 40022 9050311 72 2 10 006 lta 942 MS 0 3072 7 za d000t M2 789 0 23 18 sgizy zla N IMS MU T um i a90 e 740066 2 00 0978520 t80 16 14 1 ircuit Diagram Figure A 3 C130 PSB Board Assembly C Rev A Appendix LX 300 Service Manual 33tvw 180 9 SZH 2502 2 195259 wz 571 898 89 2 SZH 016 1502 13 991VW 00 958 53721710 180 63721210 wot 2109Y 8 299 VAR 75H 250 2 21162 77 Nan neo 502 B 6 xt S9u 9050311 noo 550 475 2 Mt 7ULZ 284 AOS 002 52 60 95 9 csu IHI 1619 8W3
66. nism Rev A 2 5 Operating Principles LX 300 Service Manual Push Pull Tractor Method The push pull tractor method is a combination of the push method using the standard tractor and the pull method using an optional tractor The two traders operate simultaneously to push and pull the paper through the printer mechanism Figure 2 6 shows push pull tractor operation when the paper is fed through the rear paper entrance 7 ht j COVER ROLLER DRIVEN 514 Figure 2 6 Push Pull Tractor Paper Advance Mechanism Disengage Lever The disengage lever switches whether or not the printer transmits the torque of the PF motor assembly to the tractor transmission gear See Figures 2 5 and 2 6 The paper path is different from friction feed and tractor feed The PF driven roller is not in the tractor feed paper path so continuous paper is not advanced by this roller Figure 2 7 shows the paper path ET SHEET GUIDE lt Cut Sheet PLATEN Continuous paper TRACTOR DETECTOR ASSY PE ROLLER PF DRIVEN Figure 2 7 Paper Path 26 Rev A LX 300 Service Manual Operating Principle 2 1 4 Ribbon Advance Mechanism The ribbon is held between the ribbon advance roller ribbon driven gear and the ribbon pressure roller When the carriage moves on the CR guide shaft from left to right and vice versa the timing belt turns the belt driven pulley Then the torque is transmitted to the ribbon driving gear ie
67. nks 2 Mazowia ON OFF Blinks Bulgaria 1 Rev LX 3 10 Service Manual Product Description Table 1 24 Auto Line Feed FONT Light 1 FONT Light 2 PAUSE Light Auto Line Feed Tractor Table 1 28 Interface FONT Light 1 FONT Light 2 PAUSE Light Interface Auto selection 10 me wait FONT Light 1 FONT Light 2 PAUSE Light Bit Rate ON OFF OFF 300 bps 600 bps 1200 bps ON OFF ON 4800 bps OFF ON ON 9600 bps ON ON ON 19200 bps Rev A 1 19 Product Description U 300 Service Manual Table 1 30 Parity Bit Odd Table 1 31 Data Length FONT Light 1 FONT Light 2 PAUSE Light Data Length ON ON ON Table 1 32 ETX ACK FONT Light 1 FONT Light 2 PAUSE Light ETX ACK ON ON to fh TS Rev A LX 3 10 Service Manual Product Description 1 5 MAIN COMPONENTS The main components of the LX 300 is designed for easy removal and repair The main components are E C130 MAIN BOARD Control board C130 PSB PSE 120V 220 240V BOARD Power supply board E M 3G1O Printer mechanism M Housing 1 5 4 C130 MAIN Board The C130 MAINboard consists of an E01A09 CPU Program CG ROM a RAM an EEPROM etc PROM E01A09 CPU Program CG 25 5060 PF MOTOR Driver 2SC5060 Printhead Driver UPC78MOSAHF CR MOTOR Regulator IC DRIVER Figure 1 9 C130 MAIN Board Component Layout 1 5 2 C130 PSB PSE Board
68. ond to the idling voltage and the paper handling condition The IC1 controls motor speed At the holding time The PFCOM voltage is changed VPinto VL A4 by the IC1 SYSTEMIC ICI MOTOR ASSY P Figure 2 18 Paper Feed Motor Driver Circuit Diagram 2 3 8 Printhead Driver Circuit Figure 2 19 shows the printhead driver circuit block diagram Print data already expanded into image data is split by the CPU block and transferred to the latchcircuit in the gate array block in the system IC ICI Port AN6 pin 66 of ICI samples the voltage of the 35 WDC line via the A D converter By sampling the 35 VDC line voltage and determining the length of the head drive signal it is possible to maintain the energy supplied to the head at a constant level If the voltage from the 35V line is HIGH ICI shortens the output pulse If the voltage from the 35 VDC line is LOW ICI lengthens the output pulse Printhead SYSTEMIC VP Q Q ee tig Q6 O O e n a os o pos m B 4 00 HD4 fd UUU ics 0 i 0 o m HD7 s zuj oe UUU D In 98 HD9 Kl VP 5 EET i LT i Figure 2 19 Printhead Driver Circuit Diagram 2 16 Rev A B zr LX 300 Service Manual Operating Principle 2 3 9 Interface Circuit Figure 2 20 shows the parallel interface circuit block diagram Data from the host computer is latched within the system IC by a WOOSTR
69. or printing PAUSE light is off Paper out error Beeper sounds ee and PAUSE light blinks light on off ratio 6 1 Tear off PAUSE light blinks light on off ratio 1 6 Operating error fatal error Beeper sounds and PAUSE light is on 1 4 5 Selected Font The combination of two FONT LEDs 1 and 2 is used to indicate the selected font Table 1 17 Font Selection Selected Font FONT 1 Draft condensed OFF OFF OFF 1 4 6 Paper Position Adjustments To enter adjustment mode press the PAUSE button for three seconds until the printer beeps once and the FONT lights blink to indicate that the adjustment operation is available If the printer state is not one of the conditions shown below this operation is ignored TOF position adjustment The position can be adjusted just after the paper is loaded Tear off position adjustment The position can be adjusted when paper is actually located at the tear off position In the adjustment mode press the LF FF button to feed paper forward and the FONT button to feed paper backward You can cancel adjustment mode bypressingthe PAUSE button or inputting a print command The adjusted position is stored in non volatile memory Rev A 1 15 Product Description LX 300 Service Manual 1 4 7 Printer Initialization There are two types of initialization hardware initialization and software initialization 1 4 7 1 Hardware Initialization Hardware initialization is perf
70. ormed by Turning on the printer n Sending the parallel interface the INIT signal If the INIT signal is active when the printer is turned on hardware initialization is started when the INIT signal becomes inactive When hardware initialization is performed The printer mechanism is initialized Print data in the input buffer is cleared Download character definitions are cleared The printer s settings are returned to the defaults The printer is set to the standby condition if no fatal error occurs Continuous paper home seeking is performed In continuous paper home seeking The printer feeds continuous paper to the paper park position e The printer then loads the paper again e If ejection to the paper park position cannot be completed within 16 inches paper is returned to its previous position 1 4 7 2 Software Initialization Software initialization is performed upon receipt of the control code ESC When software initialization is performed Print characters in the buffer are not cleared The printer setting is changed to the default but the download character definition is not cleared 1 4 8 Printer Settings 1 4 8 1 Selectable Printer Settings The following printer settings can be changed by users in default setting mode Character spacing 10 12cpi Shape of zero Slashed Not slashed 1 inch skip over perforation On Off Auto line feed On Off Character table Stand
71. ould be approximately 150 ohms If the motor is shorted also check the drivers on the driver board Check to see if the ribbon mask is defective Measure the CS motor assembly coil resistance It should be approximately 150 ohms If the motor is shorted also check the drivers on the driver board Check whether the ribbon advances when the printer is turned on Replace the ribbon feed mechanism Reinstall the ribbon mask Adjust the gap Refer to Section 4 Platen Gap Adjustment Replace the PE sensor Replace the CS motor assembly and drivers if necessary Replace the ribbon mask Replace the CS motor assembly and drivers if necessary Replace the ribbon feed mechanism Rev A CHAPTER 6 Maintenance Table of Contents 6 1 PREVENTIVE MAINTENANCE 6 2 APPLYING LUBRICATION 6 1 List of Figures Figure 6 1 LX 300 Lubrication 6 2 List of Tables Table 6 1 Eubrication s iuo ba oe a Vee te kee edd 6 1 Table 6 2 Lubrication 6 1 LX 300 Service Manual Maintenance 6 1 PREVENTIVE MAINTENANCE Preventive maintenance includes regular cleaning of the case exterior using denatured alcohol as well as occasional vacuuming of the mechanism s interior to remove dust and paper debris After cleaning the unit check that it is adequately lubricated as described in Sec
72. p adjustment lever to O Remove the printhead Remove the ribbon mask with a pair of tweezers Install the printhead Adjust the platen gap using the flowchart below The correct platen gap is 0 455 mm 0 015 mm When measuring the gap take care to let the gauge fall between the platen and the printhead by gravity only To increase the platen gap turn the parallelism adjustment bushing toward the platen using a screwdriver To reduce the platen gap turn the parallelism adjustment bushing away from the platen START Is the Platen Adjust the Platen Gap on the left Gapcorrect on the left side a side Adjust the Platen Gap on the right side Is the Platen Gapcorrect on the right side Is the Platen Gapcorrect on the left side Figure 4 1 The Flowchart of the Platen Gap Adjustment Rev A 4 1 Adjustments LX 300 Service Manual 4 2 DEFAULTS MACHINE INFORMATION SETTINGS AND BIDIRECTIONAL ADJUSTMENT prm 4 2 1 Defaults and Machine Information Settings Perform the procedure below when the main board assembly is replaced 1 Connectthe printer to a PC 2 Tur the printer on 3 Load paper into the printer by pressing the LF FF button You can use either cutsheet or continuous paper 4 Load the GWBASIC program onto the PC 5 Inserta diskette containing the LX 300 Adjustment Program into the PC s diskette drive 6 Load the LX 300 Adjustment Program named LX300 7 When you
73. per Feeding Load Press the LF FF button Load manual insertion Press the LF FF button or the printer waits 2 seconds after insertion of a cut sheet to load paper automatically Line feed Press the LF FF button once Eject cut sheet Hold down the LF FF button continuously Form feed continuous Hold down the LF FF button continuously Paper park continuous Press the FONT and LF FF buttons at the same time Tear off continuous Only uses auto tear off function Character Selection Font selection Press the FONT button Pitch selection Selectable indefault setting mode 10 cpi or 12 Condensed selection Press the FONT button Only draft condensed is selectable Enter Special Mode Self test mode Hold down the LF FF button and turn on the printer Default setting mode Hold down the FONT button and turn on the printer Hex dump mode Hold down the LF FF and FONT button and turn on the printer Demonstration mode Not available 1 4 2 Self test Function This section explain how to run the self test 1 Hold down the LF FF button and turn on the printer to start the self test 2 If paper is not loaded the printer attempts to load it 3 If the printer cannot load paper it indicates this by turning on the PAUSE light In this case insert paper again and press the LF FF button 4 The printer prints alphanumeric characters continuously 5 Quit self test mode printing by pressing the PAUSE button and turning t
74. r equivalent Data transmission timing See Figure 1 7 BUSY ACKNLG DATA STROBE Typical 5 us Typical 5 us 5 ps minimum ps minimum Hs minimum 0 0 5 0 5 Figure 1 7 Data Transmission Timing Note Transition time rise time and fall time of every input signal must be less than 0 2 s The Busy signal is active HIGH under the following conditions During data reception See Figure 1 7 When the input buffer is full When the INIT input signal is active During initialization When the ERROR signal is active During the self test mode During the default setting mode The ERROR signal is active LOW under the following conditions When a paper out error occurs When a release lever operation error occurs When a fatal error occurs The PE signal is active HIGH under the following conditions When a paper out error occurs Rev A 1 11 i LX 300 Service Manual 1 ts and signal functions for the 8 bit parallel interface Pin Assignments for Parallel Interface The STROBE pulse is used to read the input data The pulse width must be more than 0 5 p s Input data is latched after the falling edge of this signal Parallel input data to the printer HIGH level means data 1 A LOW level means data This pulse indicates data has been received and the printer is ready to accept more data The pulse width is approximately 12 pa HIGH indicates the printer c
75. rrent in the carriage motor coils and regulates the current The amount of current flowing in the coils varies depending on the speed of the carriage motor The amount of the current is set by the system IC IC1 Signals are sent to CRI1and CRD on the system IC The motor driver IC sets the coil current to correspond to the carriage motor speed Ports on the CPU block control the stepping motor via the gate array block in Table 2 9 Carriage Motor Drive Modes Drive Frequency Type Standard Print Character 1080 pps 60 dpi printing draft Driver Mode Excitation Type 3 x speed 2 x speed 1600 pps 80 dpi printing i ere 1xspeed 12 phase 800 pps 120 90 dpi printing 2 3 x speed 1 2 phase 533 pps 180 120 90 dpi printing 7 8 x speed 1 2 phase 830 pps Home position seek 5V 5V CR MOTOR MOTOR SYSTEM IC IC1 R4 R5 DRIVEIC A1 ASSY CR OA o P OB o e Figure 2 17 Carriage Motor Driver Circuit Diagram Rev A 2 15 Operating Principles LX 300 Service Manual 2 3 7 Paper Feed Motor Driver Circuit Figure 2 18 shows the paper feed motor driver circuit open 100P constant voltage drive with 1 2 phase excitation The ports pins 137 140 on the system IC ICI are used to control the stepping motor The pulse signal from the controls four transistors and the stepping motor The motor is driven at speeds 800 900 1000 1200 and 1300 pps to corresp
76. run the program the following message appears on the display LX 300 Adjustment Program 1 Bi D Adjustment 2 Defaults amp Machine Information Settings ao 3 END ES If ready press 1 3 and the Enter 8 Press 2 then Enter to select Defaults amp Machine Information Settings 9 The following message appears on the display Which destination do you want to select EAI 1 EDG 2EIS 3 EFS 4 EHK 5 ESP 6 ESP 7 EUL 8 EIB 9EAL A ETT B Press 1 B and the Enter key 10 The following message appears on the display LX 300 Default amp Machine Information Data Registration Program bn If you press the Y key all data stored in the EEPROM on the main board will be initialized to the factory default settings Before proceeding confirm the following 1 The printer is connected to the computer correctly 2 The printer is on 3 Paper is loaded in the printer If ready press Y and the Enter key 4 2 Rev A LX 300 Service Manual Adjustments 11 Press Y then Enter The default setting table appears on the display No Add Function SW amp Valid 1 Message language English 2 Tractor control Single 3 Character table PC 437 4 Page length 11 inch 5 1 inch skip over perforation OFF 6 Interface selection OFF 7 Bit rate 9600 bps 8 Prii bit NONE 9 Date Length 7 bit 10 ETX ACK protocol DISABLE 11 Auto tear off OFF 12 Character spacing 10 cpi 13 Auto line feed OFF 14 Sh
77. s and lists lubricants and adhesives required to service the equipment APPENDIX Describes connector pin assignments circuit diagrams circuit board component layout and exploded diagram The contents of this manual are subject to change without notice REVISION SHEET Revision Issue Date Revision Page April 6 1994 ist issue m TABLE OF CONTENTS CHAPTER 1 PRODUCT DESCRIPTION CHAPTER 2 OPERATING PRINCIPLES CHAPTER 3 DISASSEMBLY AND ASSEMBLY CHAPTER 4 ADJUSTMENTS CHAPTER 5 TROUBLESHOOTING CHAPTER 6 MAINTENANCE APPENDIX Vi CHAPTER 1 Product Description Table of Contents 1 1 FEATURES 1 1 1 2 SPECIFICATIONS 1 2 1 2 1 Hardware 5 5 1 2 1 2 1 1 Paper Handling 1 3 1 2 1 2 Paper 5 lt 1 4 1 2 1 3 Printable 1 5 1 2 1 4 Ribbon 1 7 1 2 1 5 Electrical 5 lt 1 8 1 2 1 6 Environmental Conditions v ses reb saae 1 8 ds bor Relabilty edt Qo od Geb tales e dodi ive BRS cee e Je 1 8 1 2 1 8 5 1 8 1 2 1 9 Physical Specifications 1 8 1 2 2 Firmware lt
78. s turned for 235 steps black yellow Then the motor returns one step yellow black and the motor is stopped Finally the motor returns 223 steps yellow black and stops This position is home position Table 2 5 gives coloring sequences For halftones as shown in the table a color is created by printing one color on top of another Table 2 5 Coloring Sequences Print Ribbon Print Color _First Printing Second Printing yan Violet Magenta Cyan Note The printer prints the brighter color first to prevent the ribbon from be ng stained 2 8 Rev A tert pm es LX 300 Service Manual Operating Principle Fulcrum Color Ribbon Cartridge LEVER CS HOLDER CARTRIDGE COLOR Pinion of MOTOR ASSY CS Color Shift Cam CAM GEAR CS Color Shift Cam Follower Figure 2 9 Color Shift Mechanism 2 1 6 Platen Gap Adjustment Mechanism The platen gap the gap between the platen and the printhead can be adjusted to allow the printer to use paper of different weights or thicknesses When the gap adjust lever is moved forward or backward the CR guide shaft rotates This rotation moves the carriage either toward or away from the platen and changes the platen gap The correct platen gap is 0 45 0 02 mm with the gap adjust lever set to position O LEVER G ADJUST Motion _LEVER G ADJUST 11 Printhead Stites d M P gt Printhead Motion Platen y SHAFT CR GUIDE Figure 2 10 Pl
79. t point of the right tractor frame and tractor shaft The contact point of the driven pulley shaft and drive pulley The contact point of the driven pulley shaft and drive pulley Note Lubrication must be applied during the reassembly process Figure 6 1 LX 300 Lubrication Points BD Rev A Appendix Table of Contents A 1 CONNECTOR SUMMARY A 1 CIRCUIT DIAGRAM CIRCUIT BOARD COMPONENT LAYOUT EXPLODED DIAGRAM AO A 5 CASE OUTLINE DRAWING Figure A 1 Figure A 2 Figure A 3 Figure 4 Figure A 5 Figure A 6 Figure A 7 Figure A 8 Figure A 9 Table A 1 Table A 2 Table A 3 Table A 4 Table A 5 Table A 6 Table A 7 Table A 8 Table A 9 List of Figures Cable A 1 C130MAIN Board Assembly Circuit Diagram A 5 C130 PSB Board Assembly Circuit Diagram A 7 C130 PSE Board Assembly Circuit Diagram A 8 C130 MAIN Board Assembly Component Layout A 9 C130 PSB PSE Board Assembly Component Layout A 9 LX 300 Exploded Diagram 1 A 10 LX 300 Exploded Diagram 2 A n LX 300CaseOutline 0 A 14 List of Tables Connector 5 2 Connector Pin Assignments 2 A 2 Connector Pin Assignmen
80. tegory Requirement 4 phase 48 pole PM type stepping motor Drive Voltage 35 VDC 10Yo Coil Resistance 150 ohms 5 per phase at 25 C or 77 F Drive Pulse Frequency Color shift 500 pps Excitation Method Constant vottage 2 2 phase excitation The ribbon shift mechanism consists of the color ribbon and color upgrade kit The color upgrade kit is composed of the CS motor assembly ribbon shift gear cam motor driver IC and color ribbon sensor The l inch wide color ribbon is separated into four equal width bands of different colors The ribbon shift mechanism shifts the ribbon cartridge up and down When the color ribbon cartridge is loaded it is possible to print in up to seven colors One of the four colors on the ribbon is selected by the color ribbon cartridge motion which inserts a portion of the plastic posts into the slots in the printer mechanism as a fulcrum Figure 2 9 illustrates the color shift mechanism The mechanism shifts the ribbon cartridge by converting the gear rotation to liner motion up and down of the color ribbon cartridge using color shift cam gear Any color band can be selected by rotation of the CS motor assembly using the color home position the position of the black color band as a starting point and reference position Home position is recognized by the CS motor assembly stepping pulse When printer is power on the CS motor assembly is excited at any phase position at first Next the CS motor assembly i
81. tegory Requirement Type 4 phase 48 pole PM type stepping motor Drive Voltage 31 5 38 5 VDC Coil Resistance 180 ohms 7 per phase at 25 C 77 F Normal Draft 1320 pps Drive Pulse Frequency Color Mode Draft 1980 pps Excitation Method Constant voltage 2 2 phase excitation 1 2 phase excitation PULLEY DRIVEN CARRIAGE ASSY DETECTOR HP FRAME BASE Striker Figure 2 2 Carriage Movement Mechanism 2 2 Rev A LX 300 Service Manual Operating Principle 2 1 3 Paper Handling Mechanism During normal operation the paper is fed to the printer advanced to the specified position and ejected from the printer These paper handling operations are performed by various paper handling mechanisms such as the tractors rollers and gears This section describes the paper handling mechanism for this printer 2 1 3 1 Paper Feed Mechanisms Cut sheets are fed by friction Continuous paper is fed by a tractor There are three ways to feed with tractors the push tractor method the pull tractor method and the push pull tractor method During normal operation the printer is set up with only one tractor which functions as either a push or a pull tractor depending on where it is attached on the printer To use the push pull tractor feed method an optional tractor must be attached There are two ways to insert paper into the printer Cut sheets use the top entrance and continuous paper use rear insertion 2 1 3 2 Paper
82. ter lets you check your print pattern selection for confirmation following steps 9 and 10 by printing one row of the pattern you selected After the printer prints check patterns for confirmation the following message appears on the display If Bi D is correct press Y and the Enter key and if Bi D is incorrect press N and Enter If your printed pattern is aligned vertically press Y and Enter to complete the Bi D adjustment Otherwise press N to return to step 9 to specify another adjustment value Rev A 4 5 Chapter 5 Troubleshooting Table of Contents 5 1 OVERVIEW 5 1 5 2 UNIT LEVEL TROUBLESHOOTING 5 4 5 3 REPAIRING THE MAIN BOARD ASSEMBLY 5 11 5 4 REPAIRING THE PRINTER MECHANISM 5 13 List of Figures Figure 5 1 Troubleshooting 5 1 Figure 5 2 Printhead Connector Pin 5 2 Figure 5 3 Flowchart 5 5 4 List of Tables Table 5 1 Printhead Coil 5 1 Table 5 2 Printhead Driver Test 5 2 Table 5 3 Motor Driver Test Points GW Se ad we akan es 5 2 Table 5 4 Motor Coil Resistance Test 5 3 Table 5 6 Sensor Test 5 3 Table 5 6 Error State
83. the ihe ri inserted correctly into the timing docs hof 9 timing bottom of the carriage belt elt is The carriage move defective Replace the does not Check for a broken timing belt timing operate when belt turned on Clean and after the camlage has The carriage SR dla been m vesto th The carriage Check whether the carriage shaft manually left slightly movement is moves smoothly when moved assembly then stops not smooth manually Replace the CR motor assembly The carriage mon Use multimeter to check the Replace the end th a defective HP sensor HP sensor stops The printhead FFC common Check the common wires for Replace the wires are the printhead FFC FFC Self test The carriage _disconnected rinting is not moves but i i Seed does not print stek ponnera Gol Replace the p resistance It should be The printhead imately 33 3 oh If printhead and is bad Aga drivers if the printhead is shorted also check the drivers y Rev A 5 13 Troubleshooting Table 5 9 Repairing the Printer Mechanism Continued Problem Symptom Check Point Solution Measure the printhead coil resistance It should be Replace the printhead approximately 33 3 ohms If drivers if A particular The printhead the printhead is shorted also A dm dot is missing is defective check the drivers ecessary Check to see if
84. the dot wires Replace the zrinting is 2 abnormal The printhead Check whether the tips of the Replace the The printing is iS defective wires are worn printhead Ra A or The platen Set the gap adjustment lever to Adjust the e prin i the first position and check the gap Refer to density is not 15 dl platen gap Section 4 1 1 uniform Ried The appropriate value is 0 45 Platen Gap Adjustment Foreign substances Perform a visual cheek of the ka i nan are lodged in paper path s bstan s the paper path Remove foreign substances Printing is PF motor Check that no foreign Paner teed I formed but the assembly is substance is lodged between assembl SER paper is not not driving the the gears and that the gears reducti od fed or is not gear correctly jare not broken or worn ears fed uniformly d e the paper pickup gears Measure the coil resistance for Replace the The PF motor the PF motor assembly The PF motor assembly is approximate value should be assembly defective 56 ohms If the motor is and drivers if shorted also check the drivers necessary A Remove the ribbon cartridge Ma AE rotate its knob manually and En the defective s i ribbon feeds cartridge The ribbon The ribbon is not turnin M abnormal gt R Check whether the RD ratchet Hea A rotates when the carriage is are caught in mo
85. tion 6 2 below Before returning the printer to the customer inspect the springs paper feed rollers and basic operation Disconnect the printer from the external AC power source before performing maintenance Do not use thinner trichloroethylene or ketone based solvents on the plastic components of the printer 6 2 APPLYING LUBRICATION EPSON recommends that the printer be lubricated at the points illustrated in Figure 6 1 Table 6 2 lists each point along with its recommended lubricant The recommended lubricants are EPSON G 20 G26 and O 2 all of which have been tested extensively and found to comply with the needs of this printer Table 6 1 provides details about these lubricants Before applying a lubricant be sure that the surface to be lubricated is clean Do not apply too much lubricant as this may darnage nearby parts Table 6 1 Lubrication Name Quantity G 26 Grease G 20 The hooks that attach the CR motor assembly to the base frame 3 places The shafts for the gear train on the left frame The shafts for the gear train on the right frame The contact surface of the release lever and tractor transmission gear The oil pad in the carriage assembly The teeth of gear 34 The point at which the platen ground spring contacts the platen shaft The portions of the carriage assembly that contacts the CR guide frame The contact portion of the left tractor frame and tractor shaft The contac
86. ts A 2 Connector Pin Assignments 4 A 2 Connector Pin Assignments 5 A 3 Connector Pin Assignments A 3 Connector Pin Assignments 7 A 3 Connector Pin Assignments 8 A 3 Connector Pin Assignments 9 10 11 A 3 Table A 10 Part No Reference A 13 Appendix LX 300 Service Manual A 1 CONNECTOR SUMMARY Figure A 1 illustrates how the primary components are connected Table A 1 sumrnarizes the functions and sizes of the connectors I printer Mechanism AC IN MOTOR ASSY PF BOARD ASSY PSB I PSE Release Lever Position Sensor DETECTOR HP MOTOR ASSY CR DETECTo E Printhead PARALLEL VF SERIAL VF HOST COMPUTER CS BOARD ee er ay Color Upgrade Kit MOTOR 55 5 Color Ribbon Sensor Figure A 1 Cable Connections Rev A A 1 LX 300 Service Manual Appendix Table A 1 Connector Summary PE Board Connector Function Pins Parallel serial interface z CR motor assembl 6 PF motor assembl 6 PSB PSE board assembl 5 Printhead 12 PE sensor 2 Main Board HP sensor 2 Assembly Color ribbon sensor optional Color ribbon sensor optional Color ribbon sensor optional Table A 2 Connector Pin Assignments CN2 C
87. ved Replace the the gears ribbon feed mechanism 5 14 LX 300 Service Manual Rev A gs LX 300 Service Manual Troubleshooting Table 5 9 Repairing the Printer Mechanism Continued Cause Cheek Point Solution Problem The ribbon feed is abnormal Paper becomes stained with ink Printing continues after the paper ends or when no paper is loaded Color printing is abnormal Symptom The ribbon feeds properly only when the carriage moves aS irection i e it fails to feed when the carnage moves in the other direction Ink stains appear on areas where there is print Printing continues past the end of the page The color does not change The color ribbon is not advanced The planetary gear is defective The ribbon mask is positioned incorrectly The platen gap is not adjusted correctly The PE sensor is detective The CS motor assembly is defective The ribbon is caught in the ribbon mask The CS motor assembly is defective The color ribbon feed gears are defective Move the carriage manually check whether the planetary gear turns in reverse and engages the gear Make sure the ribbon mask is in the correct position Set the gap adjustment lever to the first position and check the platen gap The appropriate value is 0 47 mm Check the PE sensor Measure the coil resistance for the CS motor assembly It sh
88. velopes is guaranteed only when the temperature is room temperature and humidity is normal 15 25 59 77 F 20 60965 Table 1 9 Roll Paper Specifications 213 mm 219 mm 8 38 in 8 62 in Diameter 127 mm 5 0 in Thickness 0 070 mm 0 090 mm 0 0028 in 0 0035 in Weiaht 52 64 g m 14 17 Ib 1 2 1 3 Printable Area Cut sheets using manual insertion OND Mir of minimum 182 mm 250 em 7 2 z MY Printable Area 209 2 mm 87 maximum 5 3 mm 02 minimum 182 mm 364 mm 7 2 14 3 Printable Area 9 mm 0 35 minimum Figure 1 3 Printable Area for Cut Sheets Using Manual Insertion ev A 1 5 Product Description LX 300 Service Manual Cut Sheets Using the CSF 3m M 3 105 minimum Letter 9 7 mm 0 38 minimum 4 210 3 Letter 216 mm 8 5 Printable Area 203 2 mm 8 j maximum 5 3 mm 0 2 minimum 4 297 mm kie Letter 280 mm 11 Printable Area 9 mm 0 35 minimum Figure 1 4 Printable Area for Cut Sheets Using the CSF Continuous paper 101 6 mm 254 mm 4 10 maximum 13 mm 0 517 3 203 mm max 5 3 mm 0 27 minimum coooooooooooooooooooooQ 9mm 0 35 min 3 s a vov vov vov G09 COOCQOCOCSCOO 76 mm 37 minimum Dooo 13 mm 0 51 or more when paper width of 101 6 mm 4 to 241 3 mm 9 5 is used 30 mm 1 W of mora wh
89. ving the PLATEN P 1 Remove the printer mechanism see Section 3 2 4 z 2 Remove the GROUNDING SPRING PLATEN that secures the platen shaft 3 Remove the GEAR 25 from the FRAME RIGHT 4 Disengage the teeth of the 2 BUSHING 11s and rotate them 5 Rotate the PLATEN and remove it A BUSHING 11 BL PLATEN PLATEN GEAR GROUNDING SPRING PLATEN 0 SS b GEAR 25 FRAME RIGHT Figure 3 11 Removing the PLATEN 3 12 Rev A LX 300 Service Manual Disassembly and Assembly 3 2 4 4 Removing the DETECTOR PE 1 Remove the printer mechanism see Section 3 2 4 2 Remove the PLATEN see Section 3 2 4 3 3 Release the SHAFT FRICTION of the PAPER GUIDE UPPER from the clips on the FRAME RIGHT and LEFT 4 Remove the PAPER GUIDE UPPER from the FRAME RIGHT and LEFT ROLLER PF DRIVEN PAPER GUIDE UPPER cOMPRESSION sPRING 800 Sed SHAFT FRICTION FRAME LEFT COMPRESSION SPRING 800 FRAME RIGHT Figure 3 12 Removing the DETECTOR PE 5 Release the 2 clips securing the DETECTOR PE and remove it DETECTOR PE Lead Wire of DETECTOR PE PAPER GUI DE UPPER Figure 3 13 Wiring of the PE Sensor Rev A 3 13 3 2 4 5 Removing the DETECTOR HP Ag 55 1 Remove the printer mechanism see Section 3 2 4 2 Release the 2 clips attaching the DETECTOR HP and remove it The clips be accessed f through 2 holes in the FRAME BASE to release the clips push each

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