Service Manual
Contents
1. 2 Head up lever Platen gear 13 MLT 288 Service Manual 8 Incorporate the 1st reduction gear so that it may engage with the gear of the motor 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 smaller gear comes to the upper side Incorporate the 3rd reduction gear so that it may engage with the 2nd reduction gear and platen gear Caution In incorporating be careful about the direction so that the larger gear comes to the upper side 1st reduction gear 2nd reduction gear 3rd reduction gear 9 After assembling each gear apply furoyl G 943 to the surface of 3rd reduction gear Surface of 3rd reduction gear Apply furoyl G 943 14 MLT 288 Service Manual 10 Insert the head SP assembly from the frame assembly top surface and insert the two holes for the head SP assembly into the projection at the bottom of the frame assembly Caution on Handling Thermal Head Assembly Do not touch the print surface of the head with bare hands Head SP ASSY Projection section Frame ASSY Head SP ASSY 11 Insert the FFC cable for the head SP assembly into the chassis hole Slightly bend the head SP at two locations near the center and fit it onto the frame assembly Secure by tightening the four mounting screws M1 7 x 3 5 starting from the center hole Mounting screw M1 7x32. 5 Chassis Frame ASSY FFC cable Head SP MLT 288 Service Manual 12 Insert the mounting screw M1 7 x 8 into the mounting hole for the motor on the left side of the frame assembly and secure the motor Frame ASSY Mounting screws M1 7x8 This is the end of reassembling work of the printer body 3 3 2 Head SP ASSY Reassembling Procedure 1 Align the head SP with the two projections on the head assembly and insert Secure with two mounting screws M1 7 x 2 This completes the assembly of the head SP ASSY Head SP Head ASSY Mounting screws M1 7x2 16 MLT 288 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 specify 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 trouble Repair Method Repair the failure according to the method mentioned in this column Repairs
3. MLT 288 Service Manual Chapter 2 Specifications and Principle of Operation 2 1 General Specifications Item Specifications Remarks Printing Method Thermal Line Dot Method O O o 2 Total number of dot 384 done Ti Dotdensity ot SSCS SSS i 5 Printing Speed 200 dot lines second 5V Head temp 250 C lt 64 dots Ka 420 dot lines second 7 2V Head temp 230 C lt 64 dots 6 Paper feed pitch 0 125mm Two motor steps Detection Function Print Head Temperature Thermistor Paper Detection Photo interrupter Head Up Detection Mechanical switch Operation Voltage Range VH DC4 2 8 5V Typ Voltage of Ni Cd or Li Ion must be 7 2V Max 8 5V would be only after charging a battery Vdd DC4 75 5 25V Consumption Current Max Approx 1 7A VH 5V 64dots 25 C Head VH Max Approx 2 4A VH 7 2V 64dots 25 C Motor VH Max Approx 0 5A Ave Approx 0 3A VH 7 2V 840 PPS 10 Recommended Roll Paper Printing face must be the surface Paper Width 58 mm of the roll paper Paper Thickness 60 72mm Between paper and core must be Manufacture Nippon Seishi Co Ltd non adhesion Type TFSOKS E2C Roll paper diameter must be less than 60mm Paper Feed Force 09N or more ma Paper Holding Forse 078N or more _ lt 13 Reliability life 6 million lines Normal temperature 25 C and MC BF 15 million lines humidity Head life Printing rate 12 5 Rated energy Pulse Resistance 5
4. done according to the above mentioned procedure can reduce wrong judgment and secure effective trouble shooting 17 4 2 Guide to Repair 4 2 1 Guide to repair MLT 288 Service Manual 1 2 Phenomenon Coue Cheek method Repair method Print Trouble Print impossible Print Light colored Dots missing Print very dirty Print quality poor Power supply to head poor Thermal head connection poor Thermal head assembly poor Power supply to head poor Thermal head assemble poor Foreign matters stuck on thermal head Thermal head assembly poor Power supply to head poor Dirt stuck on thermal head Paper poor 18 Measure power supply voltage with tester or oscilloscope Check connected condition of connector Measure power supply voltage with tester or oscilloscope Check if foreign matters stuck on thermal head Measure power supply voltage with tester or oscilloscope Check if dirt stuck on thermal head Check if paper that meets specification is used If out of rating correct power supply circuit Connect connector correctly Replace thermal head assembly If out of rating correct power supply circuit Replace thermal head assembly Wipe foreign matters off with soft cloth soaked in ethanol Replace thermal head assembly If out of rating correct power supply circuit Wipe dirt with soft cloth soaked in ethanol Replace paper that meets
5. specification MLT 288 Service Manual 4 2 2 Guide to repair 2 2 Phenomenon f Coue Check mehod Repair method Motor connector Terminal Check connected condition of Connect connector connection poor connector correctly Paper feed motor Power supply to motor Measure power supply voltage If out of rating correct does not work or poor with tester or oscilloscope power supply circuit works unstably Lead wire broken in motor Check conductivity of lead If lead wire broken assembly wires in motor assembly renew motor assembly Motor body poor Measure power supply voltage If supply voltage is with tester or oscilloscope normal replace motor assembly Paper supply poor Check if paper jammed or Set paper correctly broken to get caught in paper course Foreign matters penetrated Check if foreign matters get Remove foreign matters in gears caught in gears Gear damaged Check gear for damage Replace damaged gear Motor body poor Measure supply voltage with If supply voltage is No paper feed tester or oscilloscope normal replace motor assemly Sensor connector Check connected condition of Connect connector Presence absence Terminal connection connector correctly of paper not poor detected Paper sensor poor Replace sensor assembly Sensor Poor Sensor connector Check connected condition of Connect connector Terminal connection connector correctly Head down not poor detected Hea
6. 0 million pulses or more recommended paper Wear Resistance 50 km or more 14 Environment Operating Environment Temperature 0 45 C Printing guarantee 5 40 C Humidity 35 85 No condensation Storage Environment Temperature 20 60 C Machine stored with head in Humidity 10 90 raised condition 15 Vibration Resistance 6G Frequency 10 55Hz in three directions eect perpendicular to the machine for one hour 16 Shock Resistance 60G 11ms IN IO rre T 17 Outer Dimension 72 7 W X 38 D x 13 H mm Excluding Head up lever Connectors and Projection sections 2 MLT 288 Service Manual 2 2 Outline of Mechanism The mechanism 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 drive is to transmitted to the platen through the motor gear fixed to the motor gear the 1st reduction gear 2nd reduction ge
7. CITIZEN Service Manual LINE THERMAL PRINTER MECHANISM MODEL MILT 288 Rev 1 00 Newlv issued on Sep 29 2000 Japan CBM Corporation REVISION Rev 1 00 Sep 29 2000 Newly issued Comment Preface This booklet explains the operational principle procedure for maintenance work and others of the line thermal printer MLT 288 and is intended for maintenance personnel in fields Characteristics MLI 288 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 High speed printing up to 420 dot line sec Clear printing with 8 dot mm high resolution Use of paper 58 mm in width Use of a long life head Simple mechanism with high reliability CONTENTS Chapter 1 Handling and Maintenance of Printer ccccsssscssssscssssscessccssssccssseccssssccssssccssssscssssecs L Chapter 2 Specifications and Principle of Operation sseessnnnessnnnenennnonennnoenneoeeneoeeensoeeensoennosennnooe 2 21s General Spe ificatietis ripone naa sdieri g e NE ab JA teeters 2 2 2 QOutlitie ot Mech amisin iii iii ea is a e naan ici 3 2 3 Mechanism and Operational Principle ss mn nennnnnnnennnnnnnrnnz nanna sta snnnn
8. ar 3rd reduction gear and platen gear The platen is rotated by this drive Platen Platen gear 3rd reduction gear 2nd reduction gear Motor gear 1st reduction gear MLT 288 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 activates the head up sensor fixed to the right side of the frame Head up lever Head up sensor 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 Roll paper gt Paper sensor MLT 288 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 SI are transferred to the shift register in synchronization with CLOCK and stored in the latch register by the LATCH signal When the gate is turned ON by the head acti
9. d up sensor poor Check actuator of head up If sensor is normal sensor for deformation replace sensor assembly 19 Chapter 5 Parts List MLT 288 Service Manual MLT288 100091 00 600300 00 500277 00 800396 00 600301 00 600302 00 600303 00 600304 00 600305 00 500278 00 100092 00 200001 00 200002 00 200003 00 H560001 10 F16417 035 F01817 03 F01917 08 F15917 02 F60120 00 FRAME ASSY FRAME CHASSIS PLATEN HEADUP LEVER REDUCTION GEAR 1 REDUCTION GEAR 2 REDUCTION GEAR 3 PLATEN GEAR HEAD SP HEAD ASSY MOTOR ASS Y PE SENSOR ASSY HEADUP SW ASSY CABLE TIE T18S SCREW No 0 PHT BT 1 GUIDELESS M1 7x3 5 SCREW No 0 PH 1 M1 7x3 SCREW No 0 PH 1 M1 7x8 SCREW No 0 PHT ST 1 M1 7x2 E RING No 2 20 fal sh ph pd ph p ph fk pd pd ee ph ido ph p ph p pd MLT 288 Service Manual Chapter 6 Disassemble Drawing MLT 288 disassemble drawing 21
10. es 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 Platen Thermal head Roll paper Cm gt Paper sensor MLT 288 Service Manual 2 4 Connecting Terminal The connecting terminal is composed of two connectors Details are described in the following a hao Number of ins Recommended mated connector Thermal head FFC Cable 52806 2410 Pitch 1mm Molex Paper sensor sensor Molex 53048 0910 Motor Molex 51021 0900 53047 0910 2 4 1 Thermal Head Terminal The arrangement of thermal head cables and the function of each terminal are as follows 1 Terminal Arrangement of Thermal Head cables eve 2 YW SND 6 STROBEL Fs va Thermal head pio GND i 24 7 f STROBE6 STROBES STROBE3 N 1 ume ND STROBE4 D MLT 288 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 are as follows UUV UV ENV ad E A JO a O A open laa A 7 Photosinterupter _anode O O oU a jiedu sensor ouput Headupsensor e jfR Paper sensor e Z Head up sensor Sensor connector circui
11. oocesocessecssocesocesoosesoeesscessocssocesoosesoesssesesessssssss 2L MLT 288 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 Be sure to use paper with a width within the specified range 2 Do not give the surface of the head circuit board heating elements a mechanical shock including 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 electricity 4 Wipe off lightly dirt stuck on the surface of heating elements with a cotton swab soaked in ethanol or the like 5 Activating the dewed thermal head is likely to damage the head If dew is present on the head dry it thoroughly before printing operation 6 Feeding Paper Feed paper in the head up condition Cut the front edge of paper straight Do not insert paper with its front edge fluffed or bent Roll paper O yd en eee MA Z Loading direction Loading direction Condition of front edge When the front edge of paper comes out of the thermal head confirm that the paper has been set straight before putting the head down 7 Removing Paper Take paper out in the head up condition Take paper out slowly and straight to the direction in which paper comes out
12. rame assembly 2 Fix the motor assembly to the frame assembly by a fitting screw M2 x 3 Frame ASSY Mounting screw M2x3 Motor ASSY 3 Incorporate the head up sensor to the right side of the frame assembly Set the head up sensor in the direction and fix it by a fitting screw M1 7 x 3 5 Caution In incorporating check the leaf of the head up sensor for deformation loose fitting and cracks Head up sensor Mounting screw M1 7 x 3 5 11 MLT 288 Service Manual 4 Incorporate the paper sensor to the bottom surface of the frame assembly Caution Be careful not to break the cover of lead wires in incorporating work Paper sensor 5 Fix lead wires for the motor assembly with binding strap for lead wires not to get loose Motor ASSY inding strap Frame ASSY 12 MLT 288 Service Manual 6 Apply furoyl G 943 to the three gear pivots on the left side of the frame assembly and to the 5 platen insert hole 95 platen insert hole Gear pivods 7 Assemble the platen in the frame assembly Start by inserting the platen into the hole on the right side of the frame assembly and then inserting it into the hole on the left side Next align the profile shape of the platen gear with the left side metal shaft of the platen and press it on Insert the head up lever on the right side metal shaft of the platen and assemble with No 2 E ring Platen Frame ASSY E ring No
13. t diagram MLT 288 Service Manual Chapter 3 Disassembling and Reassembling Pay attention to the following matters in maintenance work Caution 1 2 3 4 5 6 7 3 1 Tool List Do not disassemble reassemble nor adjust the printer without reasons if it works normally Do not undo carelessly screws for fixing components in particular Upon completion of inspections be sure to check the printer for an anomaly before turning power on Never print without setting paper to the printer Confirm that paper has been set normally Be careful not to leave parts screws or others used for maintenance work in the printer In handling the print head do not use gloves that are easy to generate static electricity In disassembling and reassembling work check cables and cords for damage or defects and do not lay them facibily Screwdriver No 0 Pincette Mini radio plier Oil brush Mini nipper 3 2 Procedure for Disassembling For disassembling the printer remove parts from the frame assembly according to 3 3 Procedure for Reassembling but in the opposite order 3 3 Procedure for Reassembling 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 10 MLT 288 Service Manual 3 3 1 Procedure for Reassembling Printer Body 1 Incorporate the motor assembly to the f
14. tan tnnnnnaztannnnnnannaz 3 2 3 1 Power Transmission Mechanism Block see seennnnnnnnnzennnnzznnnanzznnnnnnzznnnzzzzntanzznntnarrnanzzzrnnazzznnnzz zz 4 2 3 2 Sensor Mechanism Block ccccccccssssccesseccessscecesessecessceccesssceceseecessaseccessecceesseeceesssecesseeceeesseeeesseeees 5 2 3 3 Print Head Mechanism Block scores dcir dk odes b A ee a ds abou led a E 7 2 3 4 Paper Feed Mechanism Block civil ia dais 7 2 4 Connecting Terminal aces ecececcatessesevtes did titi dd ida a qa dg rivera Sea 8 2 4 1 Thermal Head Terminal id is ean De ni 8 242 Motor and SensOr COMME i i iii is cases eb qeg eb ba pad si a dd sp 9 Jal Tool Listando aos 10 3 2 Procedure for Disassembling ariii iin iet bik nee da Sa eda eii alertar 10 3 3 Procedure for Reassemb line udvirinlii id td diia 10 3 3 1 Procedure for Reassembling Printer Body oooconncnncnocnonnocnoccnconncanononanonocononnnnncnncnn con ncnnon non conc cana sena 11 3 3 2 Head SP ASSY Reassembling Procedure sms nenennnnnnnnenennnnnnnnnnnnnnnnasrnrnnsnannns nanna za 16 Chapter 4 Trouble Shooting iii i ena a a ta arrest L7 441 Pro edure for A O 17 422 Guide to tepai ia ii iii a i e ial Dive i ra das aa rere vi pub teers ados 18 4251 Guide to tepait ala it b tea ods talon NU kl e a 18 4 2 2 Guide to TE Pale sie i a a Measoushsdeussbebtivelveveavessaseesmes 19 Chapter 5 Parts Listin al Chapter 6 Disassemble Drawing e ssesesooesoocesocesocessocesooes
15. vation signal print commands STBI to 6 the heating element corresponding to the stored print data is activated and this heat prints on paper oA dot 1 eccccce c o e e STB 6 f e e STB 1 S1 SHIFT REGISTER CLOCK TH THERMISTOR Vdd gt G2D Equuivalent circuit of thermal head MLT 288 Service Manual 2 Head separation processing There are six thermal head strobes The relationship between the strobe and heating element positions are as follows 193 256 257 320 3217384 3 Print data and print location Data No 1 to 384 of 384 bits transferred by SI are printed on the location shown in the following figure Paper feed direction Roll paper Printing surface A EATA E 383 384 lt DATA IN Printer mechanism Motor MLT 288 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 heat sink up and to separate the thermal head from the platen to put the thermal head in the up condition Heat sink Cam of head up lever Platen Thermal head Down condition Up condition 2 3 4 Paper Feed Mechanism Block For the paper feed mechanism the platen that is the core of the paper feed mechanism rotat
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