LX-HOOTECHNICAL MANUAL—.—EPSON

REV.-A(Printer Cover A)Fig. 1-2. Exterior View of(Printer Cover B)LX-800 with Tractor UnitTable 1-1. LX-800 OptionsI Option No. IDescription#83 10#81

REV.-A0.47 * 0.02 mm~-tl-.—PrintheadT\–PlatenFig. 4-34. Platen Gapt LeverFrame (Left side)Carriage GuideShaft Lever (Left)Fig. 4-35. Carriage Guide S

REV.-A5.15.25.3Fig.Fig.Fig.CHAPTER 5TROUBLESHOOTINGGENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

REV.-B5.1 GENERALThe difficulty in troubleshooting is that error symptoms vary, depending on the defective component.However, troubleshooting may be a

REV.-BFor troubleshooting, repair tools are listed in Tables 4-1 and 4-2. In addition, EPSON has prepared thefollowing specified tools to increase the

REV.-A5.2 UNIT REPLACEMENTThe unit replacement procedure is based on symptom analysis. According to the particular symptomfound by the multimeter, the

REV.-A(1) Printer does not operate when power switch is on.1 on the ROC FilteYMeasure the output voltagefrom ROC Filter unit.Refer to Table 2-2.Replac

(2) The carriage does not operate correctly.connectors CN4, CN5,CN6 and CN7, connecting theROCX board and the printermechanism, inserted securelIIsecu

REV.-B(3) The carriage operates normally, but the self-test printing is incorrect.ISet the gap-adjustment leverat the side nearest the platenMeasure t

(4) The self-test printing is normal, but the paper is not fedYSTART—Set the paper correctly.YReplace the printerturned manually withmechanism.\Y$’+Re

REV.-A(5) The control panel does not operates correctly.TSTARTCN3 between the controReinsert connector CN3panel and the ROCX boardYN*YYReplace the co

REV.-A1.2 INTERFACEThe LX-800 has a 8-bit parallel interface as a standard. The specifications for the 8-bit parallel interfaceare as follows:Data For

(6) The printing is incorrect in the ON-LINE mode.NOTE: It is assumed that the host computer operates normally.YSTART1Perform test printing.*NRefer to

REV.-APrinthead(Terminal assignment )o #l() #2o #3o #4o i#5O X6o #7O #8o #9( Wire assignment)Coil Resistance:19.2 & 1.9 Q at 25°C(Between each do

REV.-A5.3 UNIT REPAIRThis section indicates possible causes and checkpoints for different symptoms. The checkpoints includewaveforms and resistance va

REV.-ATable 5-5. ROCX Board Unit RepairProblemThe printer doesnot operate at all.(The power lampon the controlpanel does notlight.)● The l/F cable i

REV.-ATable 5-5. ROCX Board Unit Repair (Cent’d)Problem SymptomCauseCheckpointSolutionThe printer does Buzzer rigns 5Home positionCheck the level of I

REV.-A5.3.2 Printer MechanismIf trouble occurs with the printer mechanism, troubleshoot it as described in Table 5-7.Refer to sections 4.2 Disassembly

REV.-ATable 5-7. Printer Mechanism Unit RepairProblemSymptomCauseCheckpointSolutionCarriage motorThe carriageForeign substancesMove the timing beltRem

REV.-ATable 5-7. Printer Mechanism Unit Repair (cent’d)CheckpointSolutionReset the ribboncartridge.Replace theprinthead.Replace the headcable.SymptomC

REV.-ATable 5-7. Printer Mechanism Unit Repair (cent’d)ProblemSymptomCauseCheckpointSolutionPaper does not● Sheet load-The paper endVerify that the sw

REV.-ATable 5-7. Printer Mechanism Unit Repair (cent’d)ProblemSymptomCsuseCheckpointSolutionRibbon feed isThe ribbon feedThe ribbon slipsVerify that t

REV.-ATable 1-2 shows the connector pin assignments and signal functions of the 8-bit parallel interface.Table 1-2. Connector Pin Assignments and Sign

REV.-ACHAPTER 6MAINTENANCE6.1 PREVENTIVE MAINTENANCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

REV.-B6.1 PREVENTIVE MAINTENANCEProper maintenance is essential to maintain optimal printer performance for the longest possible periodand to minimize

REV.-ATable 6-2. Lubrication Points (Refer to Figure 6-2)INOTE: Lubrication is necessary in the process of assembly.Ref. No.Lubrication PointsLubrice

REV.-AFig. 6-2. LX-800 Lubrication Points6-3

REV.-AAPPENDIXA.1 PRINCIPAL IC SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

REV.-ALIST OF TABLESTable A-1.Primary ICS on the ROCX Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-1Table A-2.

REV.-AA.1 PRINCIPAL IC SPECIFICATIONSThis chapter describes the principal ICS used in LX-800. The ICS are shown in Table A-1.Table A-1. Primary ICS o

REV.-BA.1.l PPD781OHG (CPU)The 7810 (78 11 ) HG has the following differences from the conventional G type.(a) Driving oscillation frequency is guaran

[PORTFHPORTDIIPORTCI11’oflommm0PORTB11PORTAIIn2<‘zn<zaw1-Z——In11—IDx’uQ.vaFig. A-2. wPD7810/7811 BlockDiagramA-3

REV.-ATable A-2. PPD781O Mode SettingMode 1Mode OExternal memoryo04K Byte Addresses O to OFFFHo1 (Note)16K Byte Addresses O to 3FFFH1 (Note)1 (Note)64

REV.-BNOTES 1. “Return” denotes a twisted pair return line connected to signal ground. When interfacingthe printer to the host, use twisted pairs for

\REV.-ATable A-5. APD7810/7811 Port FunctionsPinSignalDirectionDescription1-8PAO -7In/OutPoti A. Eight-bit 1/0 with output latch. 1/0 possible by mode

REV.-A. CPU Timing (Figures A-3 through A-5)Three oscillations define one state. The OP code fetch requires four states: during T1 to T3, programmemor

REV.-AA.1.2 E05A03BA (E05A03CA) Gate ArrayThe E05A03BA gate array intergrates many CPU peripheral functions, so that fewer chips are requiredto const

LowerAddressCPUIIIIIALE ~IIIAD 13115AddressLatchTDecodeSignalAddress/Data BusIh#IIDecoder\tI/IIIIIIParallel l/FDataLatchmWRCR MotorDrivekPF MotorDriv

REV.-AA.1.3 2064C CMOS SRAMThe 2064C is a 8K-byte CMOS static RAM. The 2064C has low power consumption, and its input/outputlevel is compatible with t

REV.-AA.1.4 494 Regulator ICThe 494 regulator IC is described in Figures A-10 and A-1 1 and Table A-7.( TL&9SONLV )~<iEziqOUTPU1, CONTROL ,c0N

VCC=15VVccTESTcOEAOTIME ClINPUTSElt12K13- FEEDsACKOOUTPUT2I}O(OpEN) ,L495O(OpEN) oNLv50KClGNDVOLTAGEAT ClVOLTAGEA TC2VOLTAGEATCTDEAD-TIME Tt:REsHoLO

REV.-AA.1.5 7407The 7407 has hex open-collector buffers as shown in Figure A-12.Vcc6A6Y5A5Y4A4YFig. A-1 2. 7407 Pin Diagram/4-1 2

A.2 SCHEMATICS AND DIAGRAMS—cl<*<fFig. A-1 3. LCPNL Circuit DiagramA-1 3

‘5 W‘SWR70 W‘7 wii’● 4}’34%20s’35R34cm’37Z03C17xISW21SwlB3SCNI.-*Fig, A-15, ROCX Board Component LayoutA-1 7

REV.-A1.3 SPECIFICATIONSThis chapter describes the specifications of the LX-800 printer.●General SpecificationsPrinting method:Pin configuration:Pin d

REV.-BTable A-16. Part No. Referenca TableRef. No.DescriptionRef. No.Description100LOWER CASE ASSEMBLY424 RETAINING RING TYPE-E (2.3)101BASE PLATE425

iEPSONSEIKO EPSON CORPORATIONBUSINESS & INDUSTRIAL INSTRUMENT DIVISIONEPSON OVERSEAS MARKETING LOCATIONSEPSON AMERICA, INC.EPSON DEUTSCHLAND GmbH2

Printad in Japan87.07 -.6

REV.-ATable 1-4. Printing Speed, Character Size, and Column WidthType StyleCharecter Size (mm)Column WidthPitch (meximumFontNormalDoubleEmpha-Con-Prin

REV.-BTable 1-5. Type of PaperCut sheetFan-fold paperRoll paperSize(Width)(Width)(Width)182 mm to 216 mm101 mm to 254 mm216 & 3 mm7. 15“ to 8.5”4“

Printable area:REV.-ASee Figures 1-6 through 1-8—0.1 2“, 3 gor moreT0.87”, :or n171 2“”,305 mmL1 .2’.or mormFrintabtearea,3(7.1 5“ - 8.50/182 mm - 216

REV.-A4“ -10 ”/101 mm - 254 mmLPrintable areaR7Printablearea/0.35 ”/9 mmor more40.35 ”/9 mmor moreiPrintabhareao0000001-0 ABCo0000001XYZ :o0000-------

REV.-A● Environmental SpecificationsTemperature:–30”C to 60 ”C/–22°F to 149°F (Storage)5°C to 35”C/4 1“F to 95°F (Operating)Humidity:5% to 85%RH, no c

EPSON is a registered trademark of SEIKO EPSON CORPORATION.IBM is a registered trademark of International Business Machines Corporation.NOTICE‘ All ri

REV.-B1.4 OPERATING CONTROLSThis section describes the operating controls of LX-800 printer.1.4.1 DIP Switch and Jumper SettingsThe DIP switches that

REV.-BTable 1-7. International Character Set?-CountrySW 1-6 Sw 1-7SW 1-8U.S.A.ONONONFRANCE ONONOFFGERMANYONOFFONU.K.ONOFFOFFDENMARKOFFONONSWEDENIOFFIO

REV.-B1.4.2 Control Panel (and Auto Sheet Load Function)Figure 1-9 shows the control panel of LX-800 printer.abcdef9Fig. 1-9. Control PanelThe functio

REV.-Bg. DRAFT/LINE FEED and AUTO LOAD Switch (non-locking push switch)●●●When this switch is pressed once in the OFF-LINE mode, the paper is advanced

REV.-B1.4.4 SelecType FunctionSelecType is a feature of the LX-800 which permits type style programming via the control panelswitches without software

REV.-B1.4.5 Buzzer and Error FunctionsThe buzzer rings under the following circumstances:●●●●●●●● ✍When a BEL code is sent to the printer, the buzzerr

REV.-B1.5 MAIN COMPONENTSThe LX-800 consists of the following components:● Printer Mechanism Model-3A10 (include the Tractor Unit)● ROC Filter Unit●

REV.-A1.5.2 ROC Filter UnitThe ROC filter unit contains a power cord ( 120 V version) or AC inlet (220/240 V version), power switch,fuse, filter circu

REV.-A1.5.3 ROCX Board UnitThe ROCX board contains the main control circuit, driver circuit, and voltage regulator circuit. The mainICS on the ROCX bo

REV.-A1.5.5 HousingThe housing is comprised of the upper and lower cases, and paper feed knob, which accommodatethe printer mechanism, ROCX board unit

REV.-APRECAUTIONSPrecautionary notations throughout the text are categorized relative to: 1 ) personal injury, and 2) damageto equipment.DANGERSignals

REV.-A2.12.22.32.4CHAPTER 2OPERATING PRINCIPLESGENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

REV.-A2.5Fig.Fig.Fig.Fig.2.4.8 Print Timing Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

REV.-AFig. 2-24. Paper End Detection Area. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

REV.-A2.1 GENERALThis chapter describes the component connections, specifications and operation of the power supplycircuit section, the software for t

REV.-B2.2 CABLE CONNECTIONSFigure 2-1 shows the interconnection of the primary components, with the main board at the center.ET=IMODEL-3A1O PRINTER ME

REV.-A2.3 POWER SUPPLY CIRCUITThis section describes the operation of the ROC filter unit and regulator circuit on the ROCX board.Figure 2-2 shows the

REV.-A2.3.1.1 Fuse and Filter CircuitThe AC input from the power line first flows across the power switch and fuse F1. After being filteredby C 1 and

REV.-ATable 2-2. Power Transformer Output VoltagesRated VoltageTypePin No.No-load AC Voltage [V]AC [V] DC [V]220V0-029.327.132.3240V@[email protected]+9.0/–

REV.-A2.3.2.1 Operation Principles of Chopper Type Switching RegulatorThe operating principle of the switching regulator is illustrated in Figures 2-

REV.-A2.3.2.2 +24 V Supply CircuitThe +24 V supply circuit is a chopper type switching regulator circuit. Figure 2-8 shows the blockdiagram of the +24

REV.-APREFACEThis manual describes functions, theory of electrical and mechanical opera-tions, maintenance, and repair of the LX-800.The instructions

REV.-AWhen the printer power is turned on, ZD1 on the +20 VDC line turns on, Q22 turns on, and Vcc isapplied to IC 494. Then the oscillator (OSC) sta

REV.-A2.4 CONTROL CIRCUITThis section describes the software operation, specifications, and circuit operation of the control circuit(ROCX board). This

REV.-APESENSORPAPER FEECMOTORCARRIAGEMOTORHOMEPRINTHEAD/IIIA G.A. E05A03BAIllIIll)mhoho. -–r m-mGm-mmmoo u4<<<‘f”)‘u’Fig. 2-11. Control Circu

REV.-B2.4.1 Functions of the CPUThe core of the control circuit is the 78 10H CPU (IC2B). Table 2-3 shows the function of each pin andthe related circ

REV.-ATable 2-3. CPU Port Assignment (cent’d)PinPort,,0Signal LineNumber AssignmentNameDescription25NMII—Non-maskable interrupt input. The interrupt r

REV.-BPinNumber4546471545516263.—64Port~ssignmentWRALEPFO1PF7PDO!PD7V DDVccTable 2-3. CPU Port Assignment (cent’d)1/0o001/0IISignal LineNameWRALEA8[A

REV.-A2.4.2 E05A03 Gate Array FunctionsThis section describes the E05A03 functions. Figure 2-12 shows the E05A03 block diagram.(3STROBEI NO-7DBO-7ALED

REV.-AFunctions of the E05A03 gate array (IC3B) are as follows:1. Address latchThe gate array latches data on address data lines DBO -DB7 at the lea

REV.-ATable 2-4 shows the E05A03 functions and Table 2-5 shows the E05A03 pin functions.Table 2-4. E05A03 FunctionsLower AddressR/WPin NameFunctionRIN

Table 2-5. E05A03 Port AssignmentsPin No.SignalDirectionDescription1VccInPower (+ 5V DC)2NLQ LPoutNLQ lamp (~/off) “See NOTES 13PE LPoutPaper end lamp

IREVISION SHEETREVISION I DATE ISSUEDCHANGE DOCUMENT1st issue1-1, 5, 8, 12 through 182-2,11, 13,28,30,38 through424-1, 13, 17, 195-1, 2, 66-1A-2, 17,

REV.-A2.4.3 Data FlowThis section describesthe firmware start-up operation when the printer is initialized, data flow(especially printing data flow),

REV.-A2.4.3.1 InitializationWhen the reset signal is input, the printer is initialized as follows:CPU4GATE ARRAY————— .— ———————— — — . — — . ——1iI; C

REV.-A2.4.3.2 Print Data ProcessingAfter the initialization, the CPU enters the data waiting state. When data is input from the interface,the CPU star

REV.-A@ The CPU detects the STRB signal from the gate array (Reads MMIO and XXOI H). When the gatearray detects the trailing edge of the STRB signal,

REV.-A2.4.4 Reset CircuitA reset operation is performed when the INIT signal is input from the interface and when the printerpower is turned on. (Ref

REV.-A2.4.5 Carriage MotorThis section describes the sensor circuit, an outline of the firmware, and the drive circuit, which areused to control the c

REV.-A2.4.5.2 Carriage Motor ControlThe carriage motor control system is an open-loop system. There are two basic phase switching speeds:450 PPS (l-1

REV.-AFigure 2-20 shows the basic sequence for the carriage operation.● C. H.P.S. (Refer to Section 2.4.5.3)When the printer is initialized, a carriag

REV.-A2.4.5.3 Home Position SeekFigure 2-21 shows the home position seek operation (actual carriage movement)IHeld for 20 to 30 msaccording to the pha

REV.-A2.4.5.3 Carriage Motor Drive CircuitFigure 2-22 shows the carriage motor drive circuit.E05A03IR296CRBR30CRC5R31CRD47b_D1843x4+24 +5J3.3Kx4 ‘(3B)

REV.-ATABLE OF CONTENTSCHAPTER 1.GENERAL DESCRIPTIONCHAPTER 2. OPERATING PRINCIPLESCHAPTER 3. OPTIONAL EQUIPMENTCHAPTER 4.DISASSEMBLY, ASSEMBLY, AND A

REV.-B2.4.6.1 Paper End SensorThe paper end sensor detects whether paper is present or not. Figure 2-23 shows the paper end sensorcircuit.+51R45.6KCN6

REV.-A2.4.6.2 Paper Feed Motor ControlThe paper feed motor is controlled by an open-loop system just like the carriage motor. The basic phaseswitching

REV.-BFigure 2-26 shows the basic sequence for the paper feed motor.● RtlWhen the printer power is turned on, the paper feed motor is rushed for 30 to

REV.-AThe auto loading function is valid under the following conditions:● When the printer is OFF LINE.● Just after the signal from the paper end sens

REV.-A2.4.7 PrintheadThis section gives an outline of the software that controls the printhead, the drive pulse width control,and the drive circuit. T

REV.-A2.4.7.2 Printhead Drive Pulse Width Control CircuitIn order to keep the value of the printhead drive pulse width constant, the CpU monitors th

REV.-A2.4.7.3 Printhead Drive CircuitFigures 2-32 and 2-33 show the printhead drive circuit and the waveform of the drive voltage.CN4+24VSolenoidCoi

REV.-A.—FIRE11HD1,,;,,HD2,1;H~~ ~—HD8HD9HD1 -8 (H) 41 22 14 08 14 22 41 0000...HD9(H) 80 80 80 80 80 80 80 8000 . . . . .Fig. 2-34. The Relationship B

REV.-A1.2.3.4.DEPSONf \@ @) --N;;:LINE1&@@l@:T E R M INA L@LINE2@b@IICarriage Operation(Constant Speed)Carriage Operation(Acceleration/Decelerat i

REV.-A2.5 PRINTER MECHANISM OPERATIONThe printer mechanism includes sensors, the carriage, the paper feed, and the ribbon feed mechanism.Figure 2-36 s

REV.-A—. —1.11.21.31.41.5CHAPTER 1GENERAL DESCRIPTIONFEATURES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

REV.-B2.5.2 Carriage MechanismThe carriage mechanism includes the printhead, the carriage, the timing belt, the carriage motor, andthe platen. Fig. 2-

REV.-BPrintheadThe dot wire operation during printing is as follows: when the head driving coil for a dot wire isenergized, the actuating plate engage

REV.-B2.5.3 Paper Feed MechanismThe paper feed mechanism operates by friction feed method for cut sheets, and roll paper, and by thesprocket feed meth

REV.-B2.5.3.2 Sprocket Feed OperationWhen the printer is using the sprocket feed method, the holes in the paper are set over the sprocketpins along th

REV.-B2.5.4 Ribbon Feed MechanismThe ribbon feed mechanism consists of the ribbon cartridge and the ribbon feedI driving gearalways turns counterclo

REV.-ACHAPTER 3OPTIONAL EQUIPMENT3.1 GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

REV.-A3.1 GENERALThis chapter describes the options available for the LX-800.3.2 OPTIONAL INTERFACESThe LX-800 use the 8100 series optional interfaces

REV.-AD4.14.24.3 aCHAPTER 4ISASSEMBLY, ASSEMBLY, ANDADJUSTMENTGENERAL REPAIR INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

—LIST OF FIGURESFig. 4-1Fig. 4-2.Fig. 4-3.Fig. 44.Fig. 4-5.Fig. 4-6.Fig. 4-7.Fig. 4-8.Fig. 4-9.Fig. 4-10.Fig. 4-11.Fig. 4-12.Fig. 4-13.Fig. 4-14.Fig.

REV.-ALIST OF TABLESTable 4-1. Repair Tools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

REV.-AFig. 1-12. ROC Filter Unit (120V Version). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-19Fig. 1-

REV.-B4.1 GENERAL REPAIR INFORMATIONThis chapter describes the disassembly, assembly, and adjustment procedures for replacing any of themain component

REV.-AAll small parts are described by abbreviations.Table 4-3. Abbreviations List of Small PartsAbbreviationPart NameCsCup ScrewCPCross-recessed head

REV.-A4.2 DISASSEMBLY AND ASSEMBLYThis chapter describes disassembly of the LX-800. Assembly can be performed by simply reversingthe order of disass

REV.-A4.2.2 Removal of CasesThis section describes the upper case and control panel (LCPNL) removal.4.2.2.1 Upper Case Removal (Figures 4-2 through 4-

REV.-A4.2.2.2 Control Panel (LCPNL Board) Removal (Figure 4-4)1. Remove the upper case. (Refer to Section 4.2.2.1)2. Turn the upper case over, push t

REV.-AFig. 4-5. ROCX Board Removal3. Remove the C.T.C. screws (M3 x 6) securing the ROCX board to the base plate.4. Loosen the six bent tabs of the l

REV.-A3. Remove the five screws securing the ROC filter unit to the base plate.The screws are as follows:1 X C.B.O. (M4 X 8)1 X C. T. B.S.(O) (M4 X 8)

REV.-A3. Disconnect the cable from connector CN6 on the ROCX board.4. Unlock the two notches of the paper guide by pushing them frontward from the ba

REV.-Aa. Loosen tabs @) and @, and lift the left side of the frame 1 cm from the lower case.b. Loosen tab @ and lift the left side of the frame 5 mor

REV.-A4. Push the paper feed roller shaft down, slide it approximately 2 cm to the left, and lift it to removeit.Frame/Fig. 4-13. Removal of Paper Fee

REV.-B1.1 FEATURESThe LX-800 is a multifunctional and high speed serial dot impact printer with a compact body and thelow price.Features include:●●●●

REV.-AASSEMBLING POINTS:1. When reassembling the paper guide plate and the paper guide spacer, refer to Figure 4-15 for themounting direction.-.—$:1 I

REV.-A4.2.5.2 Removal of Paper Feed Motor (Figure 4-17)1. Remove the printer mechanism. (Refer to Section 4.2.4)2. Disconnect the motor cable from the

REV.-B4.2.5.4 Disassembly of Platen Unit (Figure 4-19)1. Remove the platen unit. (Refer to Section 4.2.4.1)2. Remove the left shaft holder and the pap

REV.-A4. Detach the timing belt from the carriage unit using round nose pliers.Be careful not to damage it.5. Lift portion A of the carriage guide sha

7.—.8.Push the notch of the frame, which securescarriage quide plate to the left to remove it.REV.-Athe carriage guide plate to the frame, and slide t

REV.-A4.2.5.6 Removal of Carriage Motor (Figures 4-25 through 4-26)1. Perform steps 1 to 5 of Section 4.2.5.5.2. Disconnect the motor cable from the c

REV.-BASSEMBLY POINT:Attach the E-rings as follows:● When attaching a ring to the left pulley shaft, set it so that its opening faces to the left.. Wh

REV.-A4.2.5.9 Disassembly of Tractor Unit (Figures 4-29 through 4-32)1.2.3.4.Loosen the three tabs of the sprocket mounting plate using a screwdriver

5.REV.-BPull out the sprocket assembly and the paper guide roller from the sprocket shaft and the sprocketguide shaft. When pulling out the paper guid

REV.-A4.3 ADJUSTMENTThis section describes the adjustment procedures required for reassembling the LX-800 printer. Whendisassembly or replacement is p