Digital LA30W Service Manual

Order Number: ER-LA30N-SV-003Service ManualTMLA30N/LA30W Companion Printer

iv5.3.7 Ribbon shift control ...

5-9(3) Paper selectionSince continuous forms and cut sheets are fed differently, the paper feed mechanism is based on the type ofpaper.When the paper

5-10(4) AutoloadingIn autoloading, paper is loaded up to a specified position without turning the platen knob. Once the FF/Loadbutton on the control

5-11(5) Paper end detectiona. Cut sheetThe presence of paper and paper near end position are detected by sensor A, an interrupt photosensor in thesens

5-12b. Continuous forms fed via push tractorThe top of continuous forms is detected by sensor B (detailed in Figure 5.11) and by feeler 1 linked to se

5-13c. Continuous forms fed via pull tractor from the bottom slotPaper end is detected by feeler 3 linked to sensor C (detailed in Figure 5.12).It is

5-145.2.5 Print head gap control (paper thickness adjustment)The print head is mounted on the carriage which is guided by the stay shaft. The stay sh

5-155.2.6 Color ribbon shift motor (option)The stepping motor turns the eccentric cam to move the ribbon shift lever, which lifts the color ribbon car

5-165.2.7 Option detection mechanismThis printer has the mechanism that automatically detects whether the tractor unit is installed as a push tractor

5-175.3 Electrical OperationThis section briefly explains circuits and how they operate.5.3.1 System configurationThe LGHIC (includes Fujitsu MB90706

5-18Sensors: Paper select Paper endPower supply100 V: PW31AA200 V: PW31BAPaper feedmotorControl board (main board)RC95AAAC input100 ~ 200 VAC

vILLUSTRATIONSFigure 1.1 LA30N and LA30W printers ...

5-19The LA30N/LA30W controller (Figure 5.17) consists of an printed circuit board, called the printer control boardor the main board with ROM. The MP

5-20InterfaceInterfaceBuzzerRS-423 boardDriver/receiverDriver/receiver(Centronics)MPULGHICResetPower stopMultisensorControl board (main board)Ther

5-21The MPU (MB90706) has the following main functions:Timing controllerDynamic RAM controllerAddress decoderInterface controllerMotor controllerFigur

5-22The HDLSI(LSI 2: MBCU20050) has the following main functions:Head pin magnet drive controllerOutput port*EXIOCS*IOWRL*IOWRH*IORDAddressdecoder

5-235.3.2 Main controllerThe main controller circuit of the printer –– the MB90706 MPU –– has a bus connected to 4M-bit ROM, two-16M-bit ROMs, 128K wo

5-24Table 5.1 shows the memory address map.Table 5.1 Memory address mapAddress area (hex)000000 ~ 0000BF0000C0 ~ 0000FF000100 ~ 00037F000380 ~ 5FFFF

5-255.3.3 Interface control(1) Centronics parallel interfaceReceived data DATA1 to DATA8 is latched to the internal MPU register just after the fallin

5-26(2) RS-423 serial interfaceThe serial interface control circuit is basically the same as the Centronics circuit, except that it has a serial-paral

5-275.3.4 Carriage motor controlThe 4-phase carriage motor, is driven by a constant current chopper drive circuit and six control signals:SPM0: This s

5-28The MPU receives phase excitation data for the stepping motor and sends data to turn the motor drive HIC on oroff. Data is set to high for a phas

viFigure 5.25 Stepping motor drive circuit ...5-2

5-29The LA30N/LA30W printer has several spacing speeds, and drives the carriage either by 1/2 phase or 2-phaseexcitation, based on speed (Figure 5.27

5-30Figures 5.28 and 5.29 show 1/2-phase and 2-phase excitation.Idle OperatingSPI1, 2SPM0(φA)SPM1(φB)SPM2(φC)SPM3(φD)DrivephaseA A B B

5-315.3.5 Print head controlOperation from reading print data to driving the pin magnet is as follows (Figure 5.30):1. Print data is read from line bu

5-32If +34 volts goes below the prescribed level during printing, the printer splits one line of printing into three-passprinting to limit the number

5-335.3.6 Paper feed controlThe 4-phase paper feed motor is driven by four signals:LFM0: This signal drives phase A of the paper feed motor.LFM1: This

5-34Unlike carriage spacing, paper is fed at only one speed (Figure 5.33), and driving is always done using 2-phaseexcitation (Figure 5.34).Paperfeed

5-355.3.7 Ribbon shift controlThe 4-phase ribbon shift motor is driven by four signals:CLM0: This signal drives phase A of the ribbon shift motor.CLM1

5-36Unlike carriage spacing, ribbon shifting is only at one speed (Figure 5.36), and driving is always done using 1/2-phase excitation (Figure 5.37).

5-375.3.8 Fire check controlFigure 5.38 shows fire check circuits. The fire check protects the carriage motor (SP motor), paper feed motor(LF motor),

5-38d. HDLSIAn internal timer is started by HDLSI after the alarm signal is received and the PWSTOP signal is output tothe power supply after counting

viiTABLESTable 3.1 Errors indicated by the Fault indicator and the buzzer...3-15Table

5-395.3.9 Control panel controlThe control panel has 16 LEDs, 7 push-button switches, a buzzer, and an LSI (MB623829) to control them. Theswitch cont

5-405.3.10 Power SupplyThere are two types of power supplies:100-120 VAC input: 29-33026-01 (PW31AA)220-240 VAC input: 29-33027-01 (PW31BA)The power

5-41Figure 5.41 Power supply block diagramBA B CACinletSWNoisefilterRectifiercircuitSurgecurrentpreven-tioncircuitSmooth-ingcircuitMainswi

5-42(3) Main voltage regulation switching (Figure 5.41 C)Smoothed DC voltage is converted to high-frequency on/off voltage by changing the frequency a

5-43b. Secondary circuit protectionOvercurrent protection (OCP)If a short circuit occurs at the load, overcurrent protection starts for the current ra

5-44(5) External signalThe power supply receives the PWSTOP signal (Power Stop signal, connector pin No. 2) from other printercomponents that enables

5-455.4 Firmware OverviewLA30N/LA30W firmware, stored in ROM, is separated into three independent software groups, –– interpretercontrol, print contro

6-1No Part name Product number Section to be Remarks LA30N/Wreferred to1 Main board with ROM 29-33022-01 4.9.1 (8)ROM board or control boardCommon2 OP

6-2( ) in the "Section to be referred to" column means the section can be used for replacing the part.The "Remarks" column include

1-1CHAPTER 1 PRINTER SPECIFICATIONS,PERFORMANCE, ANDCONFIGURATION1.1 OverviewThis manual is for maintenance engineers, and covers overall maintenance

TMPrinted in Ireland

1-21.2 Equipment Structure1.2.1 OverviewThis section outlines printer structure and features.1.2.2 Model configurationThere are two basic models. The

1-31.2.3 StructureMajor printer components are organized as shown below. Items in boldface are recommended spare parts (seeChapter 6) that can be rep

1-4(1) Upper cover assemblyThe screws (two for the LA30N and three for the LA30W) on the back, fasten the upper cover to the bottomcover. The upper c

1-5f. Cut-sheet standThe cut-sheet stand catches printed pages ejected by the printer. It must be raised while printing cut sheetsand laid down while

1-6(3) Lower cover assemblyFigure 1.4 Printer lower assembly (LA30N)Bottom coverPrinter control boarda. Bottom coverThe bottom cover supports the prin

2-1CHAPTER 2 UNPACKING, PERFORMANCE CHECK,AND CONNECTIONThe contents of this chapter are briefly reproduced from the Setting Up Your Printer in the Us

2-22.3 UnpackingUnpack the printer as follows (Figure 2.1):1. Open the carton and remove accessories — the user guide, Windows driver floppy disk, cut

2-33. Remove tape securing the acoustic cover. Adhesive tape is applied along the front edge of the acousticcover. For LA30W printers, two adhesive

2-42.4 Inspection after Unpacking1. Carefully check the printer and the accessories for visible damage.2. Install the cut-sheet stand (Figure 2.4). T

3-1CHAPTER 3 TROUBLESHOOTINGThis chapter helps pinpoint the causes of problems with the printer.Sections 3.1 to 3.5 are troubleshooting diagrams. The

3-2Figure 3.1 shows printer functional components and connecting cables without showing their names sincelocating the connectors is easy.Printer contr

3-3e. Power supplyThe power supply provides power for operating the printer. Its specifications depend on the input ACvoltage.f. Color kit (user opti

3-43.1 All Indicators Don’t LightThe flowchart below shows what to do if all indicators don’t light.All indicators don’t light.Does the mechanism move

3-5Note:To check DC voltage, use the output connector to the printer control board. Pin assignment of voltagesare as follows:Do voltage check.Unplug

3-63.2 No Print Head MovementThe flowchart below shows what to do if the print head does not move even though certain indicators light.Defective host

LA30N/LA30W Companion PrinterService ManualDigital Equipment CorporationMaynard, Massachusetts

3-7NoYesNoYesYesNoYesNoThe Fault indicator lights and the buzzer sound once.Are continuous forms in the printer?Set continuous forms in the printer a

3-8Connect the interface cable.Replace the interface cable.See page 3-5, DC voltage check.Use the correct protocol.Use the correct baud rate.Use the c

3-93.3 Incorrect Printing due to Defective Nonvolatile RAMIf the printer uses defective nonvolatile RAM or the contents of nonvolatile RAM are written

3-103.4 Printing Quality AbnormalThe flowchart below shows what to do if the printing quality is not good.Set the lever correctly.Remove the print hea

3-11See page 3-12.• Defective printer control board• Defective power supply boardPlug in the connector correctly.Replace the cable.Replace the cabl

3-12RecoveredPlug in the carriage cable correctly.Install the ribbon cartridge correctly.Set the paper thickness levercorrectly.Install the color kit

3-133.5 Forms Feed AbnormallyThe flowchart below shows what to do if forms feed incorrectly.See page 3-14.No abnormalityLoad forms correctly.Connect t

3-14Check the page length setting insetup mode.Forms are fed smoothly but there isstill a problem.Is the length of the forms fed toolong or short?E

3-15Fault indicatorLighting steadilyFlashingFlashingFlashingFlashingBuzzer soundSounds onceSounds onceSounds onceSounds onceSounds continuouslyError c

3-16

The contents of this manual may be revised without prior notice.All Rights Reserved, Copyright © 1996, 1997 Digital Equipment Corporation. Printed in

4-1CHAPTER 4 MAINTENANCEThis chapter explains the maintenance levels 1, 2, and 3 for cleaning, lubrication, inspection, and adjustment ofthe LA30N a

4-24.3 Maintenance ToolsTable 4.1 lists the tools required for maintenance.Table 4.1 Maintenance toolsNo12345678910ToolScrewdriver M3–M5 (+)Screwdri

4-34.6 Parts DrawingsThis section gives basic components and their location.Figure 4.1 Basic componentsCarriageFront stayStay shaftTractor (not visi

4-44.7 Parts That Must Not Be DisassembledThis section gives the locations of parts that must not be disassembled. Table 4.2 lists components not to

4-54.8 Level 1 MaintenanceLevel 1 maintenance includes only cleaning and lubrication. This can be performed without removing coversalthough Figure 4.

4-64.9 Level 2 MaintenanceLevel 2 maintenance includes lubrication, adjustment, and parts replacement. Level 1 maintenance should bedone at the same

4-7Acoustic coverInstallationHold the acoustic cover vertically. Then, push the mounting pins on both side of the acoustic cover into thehook of the

4-8(2) Tractor unit replacementa. Push tractorRemoval1. Raise the cut-sheet stand and the back cover together.2. Pull up both ends of the tractor unit

4-9b. Pull tractorRemovalHold both sides of the tractor unit and lift and release it from the support studs.

4-10InstallationPosition the catches of the tractor unit on the support studs near the platen shaft, push the tractor unit toward thefront of the prin

4-11(3) Cover replacement, including platen knobRemoval1. Remove the acoustic cover (Section 4.9.1(1)).2. Remove the tractor unit (Section 4.9.1(2)).3

4-125. Raise the cut-sheet stand and the back cover together, then remove them in the direction of the arrow (A).

4-136. Remove the ribbon cartridge.7. Remove the screws (two for LA30N; three for LA30W).8. Lift the back part of the upper cover.9. Disconnect the co

4-14InstallationInstall covers in reverse order of removal.Notes:Be sure that the control panel cable is inserted behind the cable holder.Check that t

4-15(4) Control panel replacementRemoval1. Remove the tractor unit (Section 4.9.1 (2)) and covers (Section 4.9.1 (3)).2. Turn the upper cover upside d

4-16(5) Printing mechanism replacementRemoval1. Remove the tractor unit (Section 4.9.1 (2)) and covers (Section 4.9.1 (3)).2. Remove the two screws.3.

4-17(6) Power supply and fuse replacementRemoval1. Remove the fuse from the power supply, if necessary.2. Disconnect AC and CNPW connectors.3. Remove

4-18(7) RS-423 board replacementRemoval1. Remove the two screws using the screwdriver M2-M2.5 (for Phillips screws).2. Unplug the CNRS connector from

4-19(8) Control board (ROM board) replacementFrom the point of the engineers, the control board is referred to by different names: printer control bo

4-20InstallationInstall the control board (ROM board) in reverse order of removal.Notes:For LA30W printers, be sure to install the grounding metal str

PREFACEThis manual is for engineers who operate, install, or maintain the LA30N/LA30W Companion Printer. Thetopics covered are:Chapter 1: Printer spe

4-21(9) Platen roll assembly replacementRemoval1. Remove the tractor unit (Section 4.9.1 (2)) and covers (Section 4.9.1 (3)).2. Move the paper select

4-22(10) Paper feed motor (LF motor) replacementRemoval1. Remove the printing mechanism (Section 4.9.1 (5)).2. Remove the motor cable from the cable c

4-23(11) Space motor (SP motor) assembly replacementRemoval1. Remove the printing mechanism (Section 4.9.1 (5)).2. Remove the two screws to remove the

4-24(12) Sensor T assembly replacementThis sensor detects a cut sheet placed on the cut-sheet stand.Removal1. Remove the tractor unit (Section 4.9.1 (

4-25(13) Carriage unit replacementRemoval1. Remove the printing mechanism (Section 4.9.1 (5)), SP motor (Section 4.9.1(11)), and print head (Section4.

4-26InstallationInstall the carriage unit in reverse order of removal.Note:Check that the gear in the carriage unit engages with the rack on the front

4-27(14) Print head and rebbon feed assembly replacementThe print head and the ribbon feed assembly are mounted on the carriage unit. The print head

4-28(15) Gear assembly replacementThe gear assembly transmits power to the paper feed mechanism. It has a mechanism that determines whetherpower is a

4-29(16) Paper feeder assembly replacementRemoval1. Remove the printing mechanism (Section 4.9.1(5), platen assembly (Section 4.9.1(9)), print head

4-30(17) Card guide assembly replacementRemoval1. Remove the platen assembly (Section 4.9.1(9)), print head (Section 4.9.1(14)), and feed roller assem

iCONTENTSCHAPTER 1 PRINTER SPECIFICATIONS, PERFORMANCE, AND CONFIGURATION ...1-11.1 Overview ...

4-31(18) Ribbon shift unit (color kit) replacementRemoval1. Open the front cover, remove the ribbon cartridge, and remove the print head (Section 4.9.

4-324.9.2 Adjustment(1) Print head gap adjustmentWhen replacing the carriage unit or platen, check that the gap between the print head and platen is 0

4-337. Move the carriage unit to the left-end print position (column 1).8. Turn adjustment lever L at the left end of the stay shaft and adjust it so

4-34(2) Vertical alignmentWhen replacing the ROM board (printer control board) or the carriage unit, check the vertical alignment byusing the diagnost

4-353. Check that alignment is correct.4. If alignment is not correct, press the ∅ or ♦ button to correct alignment. That is, if forward printing bar

4-36(3) Top-of-forms adjustment (factory use)Top-of-forms (TOF) adjustment in this item is used in the factory to micro-adjust the reference position

4-374.9.3 LubricationLubrication is required only when the printer is overhauled or mechanical components are replaced.Lubrication codes are as foll

4-38(1) Ribbon drive assemblyNo.123LocationGear teeth (4 places)Gear bearing (4 places)Inside the drumRemarksAmountCCCOilSGSGSG1-SG-C-03-SG-C-02-SG-C-

4-39(2) Color ribbon shift motor (Option)No.123LocationCam centerGear teethCamRemarksAmountCCCOilSGSGSG1-SG-C-02-SG-C-03-SG-C-0RS motor AsyShift lever

4-40(3) LF gear bearing and continuous/single leverNo.1234LocationGear teeth (4 places)(Gear A, B, C, D)Gear bearing (4 places)(Gear A, B, C, D)Gear s

ii4.9 Level 2 Maintenance ...

4-41(4) Back cover assemblyNo.12LocationSliding section between carriageunit and stay shaftSliding section between carriageunit and front stayRemarksO

4-42(5) Paper feed roller shaftNo.1LocationFeed roller shaftRemarksAmountCOilSG1-SG-C-0Holder TY517Rear stay TPaper cradleFeed roller R Asy

4-43(6) ShaftNo.1Location lubricatedStay shaftRemarksAmountCOilFLFG shaft springY304Adjustment lever LY307Stay shaft Asy1-FL-C-0

4-44(7) Stay shaftNo.12LocationGear holder bossChange lever bossRemarksAmountCCOilSGSGChange leverY420031-SG-C-0PS SpringY4272-SG-C-0

4-45(8) Front and top covers (LA30N)No.12LocationHinge (two places)Hinge (two places)RemarksBoth sidesBoth sidesAmountCCOilSGSG1-SG-C-O2-SG-C-O

4-46(9) Front and top covers (LA30W)No.12LocationHinge (two places)Hinge (two places)RemarksBoth sidesBoth sidesAmountCCOilSGSG1-SG-C-O(2-SG-C-O)2-SG-

4-47(10)Sheet guide assemblyNo.123LocationSliding sectionSliding sectionBoss (four places)RemarksWipe off excess oil after applyingWipe off excess oil

4-484.10 Diagnostics4.10.1 Self-test printingSelf-test printing produces test pages independent of the computer and the interface between the computer

4-49(2) Checking printer performanceThe self-test printing pattern includes the following:• Header (If started from Set-Up mode)• Help menu briefly ex

4-504.10.2 Hex dumpIn hex dump, the printer prints data and commands in 2-digit hexadecimal code. The interface operation is thesame as online in Nor

iii4.10 Diagnostics ...

4-51●:Buttons to be held down when turning power on.* Loads factory defaults into EEPROM and sets Normal mode.Vertical alignment, Top-of-Forms adjustm

5-1CHAPTER 5 PRINCIPLES OF OPERATION5.1 OverviewThis section explains the principles of LA30N and LA30W operation. A microprocessor controls the fo

5-25.2 Mechanical Operation5.2.1 Print head driveThe print head consists of 24 wires in six columns (see Figure 5.2). The print head has 24 electroma

5-35.2.2 Carriage driveThe print head carriage is moved by the 4-phase space motor (SP motor in the recommended spare parts) in theleft corner of the

5-45.2.3 Ribbon feedRibbon is fed by the ribbon feeder on the bottom of the print head carriage. This mechanism links carriagemovement to ribbon move

5-55.2.4 Paper feedPaper is fed by the 4-phase paper feed motor (LF motor) on the left side of the frame which rotates the platenand operates the trac

5-6(1) Continuous forms feedingA pair of left and right pin belt tractors on the square tractor shaft feed continuous forms. The tractor is installed

5-7b. Pull tractorContinuous forms fed from the bottom slot, advance along the card guide on the carriage, then, move up over theplaten.Figure 5.7 C

5-8(2) Cut-sheet feedingAs the platen rotates, a cut sheet is pinched between the feed roller and platen and fed forward.To pass the printing section,