LT286 Service Manual
Contents
1. 3 Print data and print location Data No 1 to 384 of 384 bits transferred by DATA IN DI are printed on the location shown in the following figure Paper feed direction T Recording paper Printing surface Printer mechanism Motor 9 CITIZEN LT 286 Service Manual 4 Up Down mechanism of print head The print head is normally held in the down condition When the head up lever is pushed up the cam of the lever rotates to push the head SP head spring down The projection of the head SP inserted into the groove provided on the heat sink separates the print head from the platen to put the print head in the up condition Cam of Head up lever Part of Head SP Head up lever Platen Print head Thermal head Assy Heat sink Up condition Down condition 2 3 4 Paper Feed Mechanism Block For the paper feed mechanism the platen that is the core of the paper feed mechanism rotates being driven by the power transmission mechanism Paper is supplied from the rear side of the printer and transferred to the upper part again through between the platen and head Then the paper is pressed to the platen by the head and is sent as the platen rotates 10 CITIZEN LT 286 Service Manual Platen Thermal head No 2 4 Connecting Terminal The connecting terminal is composed of two connectors Details are described in the following of pins connector Thermal head 28 Connector for Refer to2. Detection Mechanical switch Operation Voltage Range Typ Voltage of Ni Cd and VH DC4 2 8 5V Li Ion must be 7 2V M ax 8 5V would be only after charge a battery Vdd DC4 75 5 25V Consumption Current Max Approx 2 3A VH V 1420 64dots 25 C Head VH Max Approx 3 3A VH 7 2V 1420 64dots 25 C Motor VH Max Approx 0 5A AveApprox VH V 0 3A VH 2V Max Approx 0 8A AveApprox 0 5A 10 Recommended Printing face must be the Roll Paper surface of the roll paper Paper Width 58 2 mm Between paper and core Paper Thickness 60 72um must be non adhesion Manufacture Shinohji Seishi Co Ltd Roll paper diameter must be Type KF50 HAD less than 483mm Paper Feed Force SOgamre O 12 PaperHoldingFore 8090moe O 3 Head Life Pulse Resistance 50 million pulses Printing Normal temperature 25 C duty 12 5 and humidity Wear Resistance 50Km Rated energy recommended paper 14 Environment Operating Environment Temperature 0 45 C Printing guarantee 5 to 40 C Humidity 35 85 Nocondensation Storage Environment Temperature 20 60 C Machine stored with head in Humidity 10 90 raised condition 15 Vibration resistance 1G Frequency 5 to 100Hz in three directions perpendicular to the machine for one hour Me eran times 6 direction 1 time each Outer Dimension 75 W x56 5 D x21 H mm up lever and Connectors Weight Approx 82g MEGET 5 CITIZEN LT 286 Service Manual 2 2 Outline of Mechanism The mechan
3. reference plan of ead ae FPC FFC Pitch 1 25mm applicable cable Head up sensor 10 51021 1000 53047 1010 Paper sensor Molex 53048 1010 Motor Molex Hard plate 4 2 4 1 Thermal Head Terminal The arrangement of thermal head connectors and the function of each terminal are as follows 11 CITIZEN LT 286 Service Manual 1 Terminal Arrangement of Thermal Head Connectors FPC FFG Contact side Ls Thermal head connector ET O O yie ky FPC FFC 1 _ 28 12 CITIZEN LT 286 Service Manual 2 Pin layout of thermal head connector No 1 7 14 a 6 O7 a ENE 14 13 CITIZEN LT 286 Service Manual 2 4 2 Motor and Sensor connector The pin layout of the each sensors and motor connector and the name of each pin areas follows 10 9 8 7 6 5 4 3 2 1 Pin layout of motor and sensors connector ae E eee Motor RR a es See Photo transistor collector 6 Photo transistor emitter Paper sensor LED anode 8 LED cathode 89 Head up sensor output Head up sensor Head up sensor output Paper sensor Head up sensor Sensor connector drcuit diagram 14 CITIZEN LT 286 Service Manual Chapter 3 Disassembling and Reassembling Pay attention to the following matters in maintenance work Caution 1 Do not disassemble reassemble nor adjust the printer without reasons if it works normally Do not undo carelessly screws for fixing compone
4. 0 Apply Mori coat EM 10L to two gear pivots in which gears have been incorporated Frame Apply Mor i coat EM 10L Motor Assy 11 Put and incorporate the grip ring to the stepped portion on the tip of the pivot for the 2nd reduction gear fully to the root of the step using a plier exdusive for grip rings Caution a Inserting grip rings requires the use of an exclusive plier b The openness of the grip ring in insertion should not be much more than the outside diameter of the gear pivot Much openness decreases the spring force to reduce the securing force of the grip ring 20 CITIZEN LT 286 Service Manual 12 Put the lever holder in the frame Caution Be careful about the direction of inserting the lever holder so that the arc shaped part comes to the paper insertion inlet side Lever holder Frame Bottom side Apply Mor i ceat EM 10L Circle shape part Frame Bottom side aee and the arc shaped CITIZEN LT 286 Service Manual 14 Insert the head up lever from the right side of the frame Caution Insert the lever so that the sectional form of the shaft of the head up lever and that of the hole on the frame agree Frame Bottom side Head up lever 14 Incorporate the thermal head assembly from the bottom side of the frame First insert it from the hole on the side on which the motor is fitted Caution In inserting the assembly be careful not to deform the earth
5. CITIZEN Service Manual Model LT 286 Line Thermal Printer Rev 1 00 Newly issued on Jan 16 1998 Japan CBM Corporation Information Systems Div LT 286 Service Manual Preface This booklet explains the operational principle procedure for maintenance work and others of the line thermal printer LT 286 and is intended for maintenance personnel in fields Characteristics LT 286 is a line dot type small sized printer provided with a line thermal head This printer has been developed for the output terminals for POS terminals measuring and analyzing equipment medical equipment communication data equipment and the like and is small sized as far as possible Small sized and light weighted printer Print as fast as up to 400 dot line sec Clear print by high resolution of 8 dot mm Employment of paper 58 mm in width Employment of a very durable head High reliability by simple mechanism 2 CITIZEN LT 286 Service Manual CONTESTS PREFACE Hi 2 CHARACTERISTICS caironar EEA E E AAAA AES 2 CHAPTER 1 HANDLING AND MAINTENANCE OF PRINTER eererasnvvvnnnnnvnnennnnnnnnnnnnnnvnnsnnnnvenr 4 CHAPTER 2 SPECIFICATIONS AND PRINCIPLE OF OPERATION i rnrsssvvvennssvnvennnnnnvennnnnnvene 5 2 1 GENERAL SPECIFIGATION Sinnoh nin hk a A pis dadeasecdedadaaaduacabscDaadsdeabeacdaeadadiedelgeacdbaaSeddeata 5 2 2 OUTLINE ORME CHAN SM a 6 2 3 MECHANISM AND OPERATIONAL PRINCIPLE rrnrrnvenvennvnnvenvenvennvenvesvenvennvenv
6. ble Repair Method Repair the failure according to the method mentioned in this column Repairs done according to the above mentioned procedure can reduce wrong judgment and secure effective trouble shooting 26 CITIZEN 4 2 Guide to Repair LT 286 Service Manual 4 2 1 Guide to repair 1 2 __ Phenomenon Cause Check method Repair method Print impossible Print Light colored Dots missing Print very dirty Print quality poor Power supply to Measure power If out of rating head poor supply voltage with correct power tester or oscilloscope supply drauit Thermal head Check connected Connect connector connection poor condition of correctly connector Thermal head Renew thermal assembly poor head assembly Power supply to Measure power If out of rating head poor supply voltage with correct power tester or supply circuit oscilloscope Thermal head Renew thermal assemble poor head assembly Foreign matters Check if foreign Wipe foreign stuck on thermal matters stuck on matters off with head thermal head soft cloth soaked in ethanol Thermal head Renew thermal assembly poor head assembly Power supply to Measure power If out of rating head poor supply voltage with correct power tester or supply circuit oscilloscope Dirt stuck on Check if dirt stuck Wipe dirt with soft thermal head on thermal head doth soaked in ethanol Check if paper t
7. ed for a long period of time put the head in the up condition Leaving thethermal head pressed to the platen could deform the platen 6 Activating the dewed thermal head is likely to damage the head If dew is present on the head dry it thoroughly before printing operation 7 Feeding Paper Feed paper in the head up condition Cut the forward end of paper straight Donot insert paper with its forward end fluffed or bent Roll paper Good No Good Vv v7 Loading direction Loading direction Good No Good No Good I J Condition of front edge When the forward end of paper comes out of the thermal head confirm that the paper has been set straight before putting the head down 8 Removing Paper Take paper out in the head up condition Take paper out slowly and straight to the direction in which paper comes out 4 CITIZEN LT 286 Service Manual Chapter 2 Specifications and Principle of Operation 2 1 General Specifications Item Specifications Remarks 1 PrintingMethod Thermal Line Dot Method o i O 2 Total number of dot 384 dots line 3 Dotdensity I8disimm 1 4 Printingwidth 48 0mm 1 y Printing Speed 150 dot lines second 5V Head temp gt 30 C lt 64 dots 400 dot lines second 7 2V Head temp gt 30 C lt 64 dots 6 Paper feed pitch 0 125mm Two motor steps 7 Detection Function Print Head Temperature Thermistor Paper Detection Photo interrupter Head Up
8. esvensennessvenvensennesvensennenr 6 2 3 1 Power Transmission Mechanism Block wassescccssccssccssccnscerscensccnscersccnsccnscenscerscenssenscenssersseess 6 2 3 2 Sensor Mechanism Block wiccccsccccsecscsersecerscccesnecesnesensesensesensusensuesesuesensesensatensasensnesussnnesenese 7 2 3 3 Print Head Mechanism BlOKwicccccccccccsccsessccecsescccesssscseesesecsersesessesuacseesessesertesessesssesersesserss 8 2 3 4 Paper Feed Mechanism Block nn vnr ervrn rn rv vnve vnr arven ven annan erverver nnnnnveevennnnn 10 2 4 CONNECTING TERMINAL anrrvvennnnnnnnnnvvvnnnnnnnnnnnnrvennnnssnnnnrrevennsnnnnnnnnrvessnnnnnnreennesssnnnnnvveennessnnnnnnnnen 11 2 41 Thermal Head Terminal mmumrrurervnvrenrvvverovernnverenverenvrrrseressevenssverenverenevrsneressevesssvenvensnvene 11 2 42 Motor and Sensor connector rmmvrrrvrrrvvervvverenvrrenrrnr vern venrnverenv ener vrereveerversnverensereneerenene 14 CHAPTER3 DISASSEMBLING AND REASSEMBLING eneversnnnnvennnnnnvnnsnnnnvnvsnnnnnnrsnnnnvevsnnnnvene 15 SL TOOLLIST LASER 15 3 2 PROCEDURE FOR DISASSEMBLING rrrvvvnrrnrnnnnvvvvvnnnnnnnnnsvvvvnnnnnnnnsnsvvennnnnnnnnnnnvvvensnnssrrenenesssnnnnnneen 15 3 3 PROCEDURE FOR REASSEMBLING rernvrernnvensnvennnvvnnnvvesnsresssvensnvvessvvesnsresssvesssvensvesssveesnvvesssvessnreenn 15 33 1 Procedure for Reassembling Printer Body rrenan 16 3 3 2 Procedure for Reassembling Platen Roller Unit resete 25 CHAPTER 4 TROUBLE SHOOTING i rannnensnsnnvnnnnnnnnennnnnnnnv
9. hat Use paper that meets spedfication meets specification 27 CITIZEN LT 286 Service Manual 4 2 2 Guide to repair 2 2 Phenomenon Cause Check method Repair method Motor connector Check connected Connect connector Terminal condition connection poor connector Paper feed Power supply to Measure power If out of rating motor does not motor poor supply voltage with correct power work or works tester or supply circuit unstably oscilloscope Lead wire broken in Check conductivity If lead wire broken motor assembly of lead wires in renew motor motor assembly assembly Motor body poor Measure power If supply voltage is supply voltage with normal renew tester or motor assembly oscilloscope Paper supply poor Check if paper Set paper correctly jammed or broken to get caught in paper course Foreign matters Check if foreign Remove foreign penetrated in gears matters get caught matters in gears No paper feed Gear damaged Check gear for Renew damaged damage gear Measure supply If supply voltage is voltage with tester normal renew or oscilloscope motor assemly Sensor connector Check connector Connect connector Presence absene Terminal connection correctly of paper not connection poor detected Paper sensor poor Renew sensor assembly Sensor connector Check connected Connect connector Terminal condition of correctly Head dow
10. ing spring fitted on the right side of the frame Thermal head Assy Caution on Handling Thermal Head Assembly a Do not touch the print surface of the head with bear hands b After the head is incorporated keep the head up lever tothe up condition all the time except during print time so that the platen should not touch the head 22 CITIZEN LT 286 Service Manual 16 Apply Mori coat EM 1OL to the area of the head SP where the head up lever touches it the shaded area in the following figure Head SP Head up lever contact part 17 Inserting the projection at the center of the head SP to the groove at the center of the thermal head assembly from the bottom side of the frame insert the head SP to two shafts of the frame Head SP Projection Gap of Thermal head Assy 23 CITIZEN LT 286 Service Manual 18 Fix the head SP by a fitting screw M4 x 8 Caution Fasten the fitting screw carefully since the screw for which a tapping screw is used is likely to be fastened diagonally Mounting screw M4x8 Head SP G 19 Put the platen roller unit in theframe Push the lever of the platen bushing down by 90 degrees in order to hang it to the daw of the frame Platen bush Platen roller unit Platen bush This is the end of reassembling work of the printer body 24 CITIZEN LT 286 Service Manual 3 3 2 Procedure for Reassembling Platen Roller Unit 1 Insert platen bushings
11. ism of this printer is roughly separated into the following six blocks Power transmission mechanism block Sensor mechanism block Print head mechanism block Paper feed mechanism block Frame block Motor block For external circuits and others connected to the printer refer to respective operation manuals and the like 2 3 Mechanism and Operational Principle The construction and operational principle of four blocks other than the frame and motor blocks in the above mentioned six mechanism blocks are described in the following 2 3 1 Power Transmission Mechanism Block This mechanism block is located at the left side of the printer Motor driveis to transmitted to the platen through the motor gear fixed to the motor gear the 1st reduction gear 2nd reduction gear and platen gear The platen is rotated by this drive Platen Platen Gear 2nd Reduction Gear ist Reduction Gear Motor Gear 6 CITIZEN LT 286 Service Manual 2 3 2 Sensor Mechanism Block This sensor mechanism block is composed of a head up and paper sensors 1 Head up sensor This is a sensor to detect a head up down condition Activating the head in the head up condition is likely to damage the head or decrease the duration significantly This head up sensor is used to control such cases Operating the head up lever the head up sensor fixed tothe right side of the frame this sensor operates Head up lever Head up se
12. n not connection poor connector detected Head up sensor poor Check actuator of If sensor is normal head up sensor for renew sensor deformation assembly 28 CITIZEN LT 286 Service Manual Chapter 5 Parts List SERVICEPARTS LIST 97 6 12 i i No Flame Hd EE ee Eno Motor Assy Er ess Motor SMR30 2031 A Ports a 4 Head up sensor Assy O 250845 E8018090 PE sensor Assy 20m EEG o DS Sp o o Es es KO ey SRT EG 9 E8019090 istReductiongear 1 600210 10 E8019100 2ndReductiongear 1 6000 SE ese KE ee ee 12 E8031080 Platenrdle 1 1 800319 13 E8019110 Platengear 1 600209 14 E8025010 Platenbush 1 2 600208 E 8029 040 Knob 1 60 0212 17 E8032 110 Head up lever 60 0213 E 8036 010 erme 1 600217 E8037 010 Earthspring 1 500200 E ES ee E EO CENT tir E se ee EE Pee eee 24 E66000240 Thermalhead KF2002 GF13F 1 100081 EE EE ee EE 26 8021 120 Headspring 1 500200 ME EE EE GE Er SS RR RR PS E S Etc es SS RR RR PS S 32 23665872 Gripringno2 1 pp ES 34 23665880 MLXO TC 35 23665897 M25 1 pp 36 23665008 Ma3 2 pp ee oe HE ae 38 _ EringNo2 Pf cls eee Std 29 CITIZEN LT 286 Service Manual Appendix LT 286 disassemble drawing CITIZEN 30
13. nsor Right side view 2 Paper sensor This is a sensor to detect the presence absence of paper Activating the head when paper is not set is likely to damage the head or decrease the duration significantly This paper sensor is used to control such cases Platen Thermal head Paper sensor 7 CITIZEN LT 286 Service Manual 2 3 3 Print Head Mechanism Block A thermal head is used as the print head of this printer The thermal head is composed of heating elements and a head driver to drive and control the elements 1 Outline of drive control Serial print data input from DATA IN Dl aretransferred to the shift register in synchronization with CLOCK CP and stored in the latch register by the LATCH LA signal When the gate is turned ON by the head activation signal print commands STB1 to 6 the heating element corresponding to the stored print data is activated and this heat prints on paper 13 14 15 16 17 P GND vr STB6 STBS LATCH O Latch register 25 DATA INO Shift register NC 19 20 Thermistor The STB1 STB6 are pulled down in the IG Equivalent circuit of thermal head 8 CITIZEN LT 286 Service Manual 2 Head separation processing There are six thermal head strobes The relationship between the strobe and heating element positions are as follows STB No Elements No Number of dots STB ee ee _ 65 18 4 E ee 1926 4 k 25030 a k gt RR A k
14. nts in particular 2 Upon completion of inspections be sure to check the printer for an anomaly before turning power on 3 Never print without setting paper tothe printer 4 Confirm that paper has been set normally 5 Be careful not to leave parts screws or others used for maintenance work in the printer 6 In handling the print head do not use gloves that are easy to generate static electriaty 7 In disassembling and reassembling work check cables and cords for damage or defects and do not lay them forcibly 3 1 Tool List Screwdriver No 0 and 2 Pincette Mini radio plier Oil brush Mini nipper Plier exdusive for grip rings 3 2 Procedure for Disassembling For disassembling the printer remove parts from the frame according to 3 3 Procedure for Reassembling but in the opposite order 3 3 Procedure for Reassembling Separating into reassembling of the printer body and that of the platen roller unit procedure for reassembling is explained in the following Parts names used in the explanation are based on those in shown in Parts List in Chapter 5 These part names are commonly used over this service manual 15 CITIZEN LT 286 Service Manual 3 3 1 Procedure for Reassembling Printer Body 1 Incorporate the motor assembly to the frame 2 Fix the motor assembly to the frame by two fitting screws M2 x 3 SS s SEN NS ENI N Mount ing screws Mo
15. snnnnnnvsnnnnnnnsnnnnnnnsnnnnnevsnnnnnnrsnnnnnevsnnnnnere 26 4 1 PROCEDURE FOR REPAIRS vannene rea ve enn Markedets aa kane aes 26 42 GUIDETO REPAIR aa kue ee 27 4 2 1 Guidetorepalr 1 2 5 hassdnkd asia AM Aa Ad 27 4 2 2 Guideto repair 2 2 rvirssvaisiirsiepissimikeivini nsee siver iretesegiukrrgretrdensran bee 28 CHAPTER 5 PARTS LIST sic ccsssdccdssieiceceasidvelaaiiiceccavaeidcsasacdecssseisdsanasdedeavasscd avicdods evasiddicasdods shacks 29 APPENDIX saias casado discccbdacicdbedcehodedecedocascicveddovdetedssdcehovedecedoeuscdessaccddeiodsedee ouulecshoauscsesedacecetesusbeched 30 LT 286 DISASSEMBLE DRAWING ccccesccesscecscesscenscenscenseenscenscenecenecenssenecenecaeseneeeaseenscenseeneeeneeeneeeneeens 30 3 CITIZEN LT 286 Service Manual Chapter 1 Handling and Maintenance of Printer 1 The use of paper other than our recommended paper can not guarantee print quality and duration Besuretouse paper with a width within the specified range 2 Do not give the surface of the head dr uit board heating elements a mechanical shock induding penetration of foreign matters 3 In handling the printer take anti static measures and ground the human body to protect the heating elements ICs and others from damage due to static electridty 4 Wipe off lightly dirt stuck on the surface of heating elements with a cotton swab soaked in ethanol or thelike 5 During transportation and while the use of the printer is suspend
16. to both sides of the platen 2 Fix the inserted platen bushings at both sides by two E rings 3 Push and insert the knob to the right side shaft of the platen In this time make the D cut portion of the shaft agree with the D shaped hole of the knob 4 Push and insert the platen gear to the left side shaft of the platen In this time make the D cut portion of the shaft agree with the D shaped hole of the gear Caution a In incorporating the platen gear be careful about its direction so that the stamped side comes to the bushing side b Usea mini radio plier or pincette to fix E rings This is the end of reassembling the roller unit Knob Platen bush Platen Platen bush Platen gear 25 CITIZEN LT 286 Service Manual Chapter 4 Trouble Shooting 4 1 Procedure for Repairs When the printer is out of order observe the phenomenon of the trouble carefully to specify what is the trouble according to 4 2 Guide to Repairs Then repair it according to the prescribed method Phenomenon Look for the phenomenon of the trouble in the column of Phenomenon in the following list In the case of phenomena more than one take up all applicable items This can spedfy hidden defects Causes Possible causes are listed as many as possible Assume possible causes and specify the cause from the check methods mentioned in the next column Check Method This mentions check methods to specify the cause of the trou
17. tor ssy 3 Incorporate the head up sensor to the right side of the frame Set the head up sensor in the direction and fix it by a fitting screw M1 7 x 6 Caution In incorporating check the leaf of the head up sensor for deformation loose fitting and cracks Motor Assy Screw M1 7x6 Head up sensor Right side view 16 CITIZEN LT 286 Service Manual 4 Incorporate the paper sensor to the bottom surface of the frame Caution Be careful not to break the cover of lead wires in incorporating work Detector Paper sensor Opposite face Bottom Bottom side view 5 Fix lead wires for the motor assembly with binder wires for leads not to get loose Frame 17 l CITIZEN LT 286 Service Manual 6 Incorporate the earth spring to the frame by a fitting screw M2 x 5 Mounting screw M2x5 Earth spring Right side view 7 Apply grease M ori coat EM 10L to two gear pivots on the left side of the frame Frame Gear e pivots 2 e Apply Mori coat EM 10L Motor Assy 18 CITIZEN LT 286 Service Manual 8 Incorporate the 1st reduction gear so that it may engage with the gear of the motor assembly 1st Reduction gear 9 Incorporate the 2nd reduction gear so that it may engage with the 1st reduction gear Caution In incorporating be careful about the direction so that the larger gear comes to the upper side 19 CITIZEN LT 286 Service Manual 1
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