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Contents
1. N Carriage shaft Printhead Adjusting lever Adjusting screw Idler gear Adjusting gear Range from 5 to 1 Narrows M Printhead Adjusting screw Adjusting cam Guide rail Range from 1 to 5 Figure 2 5 2 2 4 Ribbon Drive See Figure 2 6 The ribbon driver mechanism moves the ribbon in synchronization with the space motor operation The ribbon drive mechanism consist of the following items a Ribbon drive gear assembly b Ribbon gear space motor c Ribbon cartridge Ribbon cartridge An endless ribbon with a single direction feed is used Ink is supplied from an ink reservoir which is built in to the ribbon cartridge Ribbon feed operation When the space motor is activated the ribbon gear rotates The rotation is transmitted via the ribbon drive gear assembly to the drive gear in the ribbon cartridge thus moving the ribbon The feed direction of the ribbon is maintained by switching the direction of the gears in the ribbon drive gear assembly This ensures ribbon movement when bi directional printing is used Ribbon cartridge Figure 2 6 2 2 5 Paper Feed Operation Paper is fed by turning the platen and the pin tractor which is driven by the LF pulse motor The paper feed mechanism consists of the following a Pulse motor with gears b Decelerating gear c Platen d Tractor feed unit e Pressure roller 1 Cut sheet and continuous sh2. 8 8 4 Upper cover access cover and sheet guide F 3 3 5 Gear case assy m 3 3 6 PC connector m 3 3 7 Space motor and guide roller assy m 3 3 8 Space rack m 3 3 9 Carriage cable 3 3 10 Back up roller holder assy r 3 3 11 Platen assy 3 3 19 Paper pan m 3 3 12 Driver board SDDV 3 3 13 LF motor 3 3 18 Carriage shaft 3 3 14 Operation panel PCB LEOP L 3 3 15 Control Power supply board SDCT 3 3 16 Transformer assy 8 3 17 Change lever and gears 3 3 20 Rear tractor assy 3 3 21 Rear pressure assy 3 3 22 Switch lever 3 3 1 Printhead 1 Open the access cover 2 Pull up and rotate the head clamp 1 to unclamp the printhead 2 as shown in fig 3 3 1 3 Disconnect the printhead 2 from PC connector 3 and remove 4 To install reverse the removal steps Notes on installation 1 Insert the printhead 2 into the PC connector 3 while pushing it against the carriage frame 4 2 The head clamp 1 must be securely sandwiched between printhead 2 and carriage frame 4 as shown in fig 3 3 2 3 Be sure to check the gap between platen and printhead see 4 4 Be careful not to touch the print head while it is hot Important There is a shim on the carriage frame 4 which hangs over the platen side of the frame Be sure to replace it correctly Improper positioning of this shim will severely affect the printhead gap Figure 3 3 1 Figure 3
3. Sliding surface of change arm and change lever EM 30L A Tractor gear bearing portion EM 30L A Change arm Idle gear teeth ee R eset spring Gear bearing portion u Sliding surface of change EM 30L A Sliding surface of lever and gear reset spring and gear EM 30L A EM 30L A 5 Tractor drive shaft Sliding surface of FG spring and drive shaft end EM 30L A Drive shaft bearing portion EM 30L A A A Arrow view 6 Pressure roller Change arm Sliding part of release shaft a S and change arm EM 30L A Release shaft Contact part of the support spring and shaft n Front pressure roller EM 30L A Contact part of the rear holder and shaft EM 30L A gt Controller holder Sliding part of the rear roller holder d en and release shaft cam surface release shaft plane portion EM 30L A Sliding part of the release shaft and rear roller holder EM 30L A Release shaft protruding part 2 parts EM 30L A Bearing part of the front roller holder and pressure roller EM 30L B Rear roller holder 7 Pull up roller Assy Pull up roller frame Pull up roller __ shaft All bearing parts of the pull up roller shaft and pull up roller frame EM 30L B Gear and post EM 30L A 9 Carriage Assy NK2 10 SUS Bearing part of the guide roller EM 30L B 5 10 6 TROUBLESHOOTING AND REPAIR 6 1 Items to C
4. Figure 2 17 2 When using continouos sheet paper 1 2 O 9 Set the change lever either to the rear or the bottom position See Figure 2 17 Load paper either on the push tractor or on the bottom tractor Press the FF LOAD button The LF motor starts to feed the paper up to the print start position The paper feeds up to the TOF position Factory default 0 35 inches from the top Press the FF LOAD button LF action N X V Detection of the sheet supplied PE Line feed about 3 inches until the detection of the sheet supplied When the FF LOAD button is pressed the LF motor feeds in the sheet about 3 inches When the LF motor completes its operation and the sheet has not been fed in an alarm condition results 2 2 8 Paper Park Function Continuous sheet paper Continuous sheet paper can be backed out automatically by using the PARK button on the operation panel 1 2 3 Press the PARK button Reverse LFstarts and paper feeds in reverse until paper end occurs or a maximum of 19 inches have been fed The paper feeds in reverse to leave the paper on the tractor PARK Paper end detection V PE DUNN SSS LF action n Reverse LF from P E Sensor to tractor feed assy Reverse LF until paper end or 19 inches max The alarm LED lights up when paper end is not detected after 19 inches of reverse feed
5. nenea neam nnne nennen nentes nen 2 20 2 2 1 Printhead Mechanism and Operation 2 20 2 2 2 Spacing Operation iie eite n a nece i a ad tea data 2 23 2 2 3 read Gap AdJUSting nt saca sa a Da eat a mt bai 2 25 2 24 RIDDON Drive 4 22 20 kian a Eile 2 27 2 2 5 Paper Feed Operation sss eene nennen 2 29 2 2 0 Paper Detection Mechanism 440urs400nnnnnnnnnnnnnnnnnnnannnnnnnnnnnnnnnnnnnnn 2 40 2 2 7 Automatic Sheet Feed seriinin edarien aianei 2 44 2 28 Papar Pak Functions deed E tit a ae 2 46 ASSEMBLY DISASSEMBLY rieira een a e da i kus la 3 1 3 1 Precautions for Parts Replacement mean nea aaa nana 3 1 9 2 Service TOONS scoica z etnie a Pt pa ai tai ca i ai bi E enema 3 2 3 3 Disassembly Reassembly Procedure men eee nenea aaa 3 3 3 3 1 Printhead L u eset un saku daia d eget ip a E ai tin a 3 5 343 2 RIBDON PIOtECIOI spatii u ete ea 3 6 3 3 3 Pulkup Roller ASSY 2 itt ee len 3 7 3 3 4 Upper Cover Assy Access Cover Assy and Sheet Guide Assy 3 8 3 3 5 Gear Case ASsy a u aie t ap maa da a renee 3 9 3 9 6 PG COMMOCION g nib te reis o page e a da a ada a 3 10 3 3 7 Space Motor Guide Roller ASSY xissasi eee name eee nana ana 3 11 3 9 8 Space Raciu ae eee ec ite eiit ital Gea sa eta NE de a 3 12 33 9 Carriage Gables tin ICE a ees 3 13 3 3 10 Backup Roller Holder Assy ce nenea
6. 1 Cut sheet detection When the sheet is inserted point A is pushed backward and the paper near end lever B rotates counterclockwise CCW At this time the rear sensor lever rotates counterclockwise CCW and pulls out of the rear and top paper end sensor to detect that the sheet is inserted The procedure for the paper end is the reverse that is detection occurs when the paper end sensor is blocked Rear feed detection When the sheet is fed from the push tractor the point B is pushed to the front side and the paper near end lever A rotates clockwise CW At this time the rear sensor lever rotates counterclockwise CCW and pulls out of the rear and top paper end sensor to detect that the sheet is provided The procedure for the paper end is the reverse that is detection occurs when the rear sensor lever interrupts the sensor Bottom feed detection When the sheet is fed from the bottom the point C rotates clockwise CW When the bottom sensor lever rotates clockwise CW it pulls out of the bottom paper end sensor to detect that the sheet is inserted The procedure for the paper end is the reverse that is detection occurs when the bottom sensor lever interrupts the sensor Paper end sensor Sensor lever Shaded portion Paper end lever Bottom paper end lever C Figure 2 15 Top line print mechanism See Figure 2 16 The top edge of the sheet is protected by the ribbon protector so that it c
7. UOISSILUSUE4 1 Q JO uollonulsul uoneolnou 10413 s8risnd ul 19594 qxudo X10dO OXLdO N 10 MO 104 xoeuo asuodsay peau ejep JO uononJjsui peay ole gt erp 037 10 eum i3 lt esa 7771 197 JO UOHONSU e14M lt _ NO Jamod C 3 2 16 2 1 8 Alarm Circuit 1 Head drive time alarm circuit This circuit monitors the drive time using the HDALM signal interlocked with the overdrive signal of each drive circuit If the drive time of any drive circuit exceeds the specified time the drive fault alarm circuit sends an ALARM N signal to turn on the SCR SO This causes the secondary coil 40V of the transformer to short circuit causing an overcurrent to flow through the primary coil and open the AC fuse transformer assy 2 Alarm processing when DC power is low 40V is converted into the POWLEV signal 0V to 5V by R28 and R29 and input into the A D port of the MPU to control the drive time and the print speed pass number of the head a Head drive time 40V The head drive time is lengthened to compensate for the amount of voltage drop by monitoring the POWLEV signal once every 500 u sec to control and maintain the impact necessary for each printing pin at the fixed value b Print speed Voltage 40V Print speed 38V or more 100 25V to 37V 100 30
8. z L 9 alde AV 1dSIG 031 wee vH Ieuj lu Ndi NHVIV JOH1NOO NIYIN AHODILVI NHVIV UJeJv eleA 6 3 p eog Alddns Jewog 01uo eoe deg Assy Jojo eoeds eoejdeyu e e qeo H d eoejdeu uedo jeubis dec peer Wud dn syu n q31 O 440 sW002 NO Su002 yug an wieje ON den pee und p eog Alddns Jewog oJ1uo2 eoe dey ejqeo H d eoejdey peer JU eoe deg Uonoeuuoo H d eui YO9YD yonu 00 SI peol J Suisiueuoeui eui X98U9 p eog Alddns amod A104U09 eoejdeyu e qeo H d eoejdeu 1o ouu eoeds a9e day e ONILOOHSFTANOHL AS YUM HOUS JO AQ UHM poys uado si 1e1siuueu L Uonisod awoy eui 0 Yyoeal JOU seop peau uld uueje q v peoH luud uue e Buiuou pe H 1uug Buruy payroeds ul utum paunooo jou SI dI eoeds S xuviNdH dOud 02 ZL 2 2 9 alde AV 1dSIGQ 031 uueje Buroeds Nav iv ONIOVdS AdODALVD Wavy 6 4 Operation panel board ke Centro connector Driver board AC connector eo Control Power supply board LF motor e Space motor 6 4 Connection Circuit Check for Printhead and SP LF Motor 1 Printhead Signal Connector pin number CN1 HEAD1 us aul HEAD2 a pete HEAD4 SL OE HEAD6 2s From HEAD8 2S pr EL es 7 Thermistor HTEMP gt i 40V i gt 40V 2 g
9. Before servicing the printer ask the customer under what circumstances the trouble occurred and record the response Before you start troubleshooting operate the printer under the same conditions as that at the time of the problem to see if the same trouble occurs again If not perform the printer s self test and thoroughly test the printer s functionality If the trouble is reproducible proceed to the troubleshooting section Troubleshooting 1 The data is not received using a serial interface 2 Using a serial interface the print data is omitted or the print operation is not performed 1 The data is not received using a serial interface A protocol is set to READY BUSY state and BUSY LINE is in SSD state g Is the OSC oscillation waveform as specified in Figure C 3 1 90ns 4to 5V 0to 1V Figure C 3 1 e No Replace the OSC Yes Is a RST signal in Q3 is as specified in Figure C 3 2 0V Figure C 3 2 e No Check the RST circuit on the SDCT board Yes Are ALE PSEN RD WR signals as specified in Figure C 3 3 542ns 180ns EJ 5V ALE OV 5V PSEN 271ns 542ns ov RD WR m 5V oV Figure C 3 3 e No Replace the Q3 Yes Are T1 SELECT and INTO BUSY signals low level e No Check Q501 on the SDDV board Yes Are 9V and 9V input to Q1 e No Replace defective component in 9 9 vo
10. 25V or less 30 2 347 3 Head overheat alarm The voltage of the output TSD signal of the thermistors one of which is in the printhead and the other in the printhead driver is monitored by the CPU AD portto control the voltage Temp Stop A 119 C 1 Mode up i oC B C Mode down Mode and print control Direction 1 5 Sec Stop When the temperature is between a C and 119 C the mode switches sequentially to higher level When the temperature falls below B C the mode switches to lower level When the temperature exceeds 119 C printing stops When temperature gradient is steep the higher mode is specified directly 2 18 2 1 9 Power Supply Circuit This power supply circuit supplies the 5VDC 8VDC 40VDC 10VAC Control Board sw Noise za o 0 on o gt filter gt 6 gt Rectifier gt Fuse eircuit Trans 7 EX Iy Regulation Circuit o NE The uses of o Voltage signal utput voltages and signals are described below Use 40V 8V 5V AC10V 5V Logic IC LED drive voltage 8V Serial interface line voltage and SP motor driver 40V Printhead LF motor drive voltage SP motor drive voltage AC 10V Option board 2 19 2 2 2 2 1 Mechanical Operation Printhead Mechanism and Operation See Figure 2 2 The printhead is a spring charged 9
11. Make sure the position and fit of the change gear shaft change arm shaft and release shaft are correct 6 13 5 _Smearing missing dots e Does ALARM LED blink and display alarm No Yes e See Tables 6 2 and 6 3 for troubleshooting information e Replace printhead e Remedied No Yes e End e Replace driver board e Remedied No Yes e End e Replace carriage cable or space motor assy 6 14 6 Faint or dark print Yes er Is the printhead gap set properly No e Adjust the printhead gap see section 5 e Remedied No Yes e End Replace printhead Remedied Yes e End Replace driver board Remedied Yes e End Replace ribbon feed mechanism 6 15 7 Ribbon feed trouble Remove the ribbon cartridge Move carriage to left and right Does the ribbon drive shaft rotate Yes e Change ribbon cartridge Remove ribbon feed mechanism Move carriage to left and right Does the ribbon drive shaft rotate Yes e Replace Ribbon feed mechanism Replace space motor assy 6 16 8 Line feed trouble p e Turn the power off and rotate the platen manually e Does the platen rotate smoothly Yes No e Is the platen gear L broken No Yes e Replace platen assembly e Is the LF motor idle gear broken No Yes e Replace the LF motor assembly or LF idle gear e ls the platen gear R idle gear or change gear broken No Yes e Replace the gear e Set change lever
12. Thank You for purchasing this Factory Service Manual on EBAY from PCTECHI NFO Click Here for more Factory Service Manuals for other Computer and Printer Copier Manufacturers from PCTECHI NFO OKIDATA MICROLINE 320 321 TURBO PRINTER Service Manual 59273701 PREFACE This Service Manual describes how to maintain the Microline 320 321 Turbo printer in the field It is intended for service personnel Refer to the user documentation for information on handling and operating the printer OKIDATA and MICROLINE are registered trademarks of Oki Electric Industry Company Ltd OKIDATA est une marque d pos e de Oki Electric Indurstry Company Ltd TABLE OF CONTENTS eec rus L a i aaa da aaa a a a dc at dul a dada iad banal lua 1 1 1 1 Standard Printer Configuration are nenea nenea nana nea nennen nennen 1 1 142 ODII0S sis zece een ee a ac n as aa ae 1 2 THEORY OF OPERATION ir aaa ten ae a da aa tina al sad aa a d aa 2 1 2 1 Electrical Operation een m 2 1 B S SUMMA escu aceea oaia s Doi ra ae ot n a Dat ap a art Za ba as 2 1 2 1 2 Microprocessor and the Peripheral Circuit ceea ana 2 1 2 1 3 _Initialization seca cote en 2 7 2 1 4 Parallel Interface Control 2 8 2 PONE c enim 2 9 2 L6 SP EF Motor Gohtrol iiti aa eda 2 12 2 1 7 Operation Panel ideni een 2 15 2 18 Alarm COUN 2 17 2 1 9 Power Supply Circuit nenea eee eee e aW a qanda aqha gs 2 19 2 2 Mechanical Operation
13. and change gear shaft 7 2 On the ML321 Turbo there are 5 rear pressure spring assemblies Use the two pieces which have larger spring diameter on the right side Use the three remaining pieces on the left side 8 Make sure that the release shaft 2 will be on top of the support spring 4 To assemble the release shaft 2 make sure that the protrusion of the switch lever 5 is in the U groove of the release shaft 2 gt i om RR Ry 2 gt SK sa 3 3 22 Switch Lever 1 Remove the upper cover see 3 3 4 2 Remove the change lever and gears see 3 3 17 3 Remove the paper pan see 3 3 19 4 Remove the rear pressure assy see 3 3 21 5 Pull the switch lever toward you and remove it upward 6 To install follow the removal steps in reverse order Note on installation When installing the switch lever make sure that the microswitch on the driver board works properly Switch lever lever T3 m x Microswitch 4 ADJUSTMENT 1 Be sure to carry out these adjustments with the printer mechanism installed on the lower cover 2 Be sure to carry out these adjustment operations on a level and highly rigid work table flatness less than 0 039 inch or 1 mm so as to minimize adjustment error Specification Drawing Adjustment method Gap between the plat It shall be measured en and the printhead at 3 points the left end the center and 1 Parallelism ad the right en
14. 1 CLEANING AND LUBRICATION Cleaning Cautions 1 Be sure to turn OFF the AC POWER switch before cleaning Remove the AC power cord from the printer Avoid dust inside the printer mechanism when cleaning If a lubricated part has been cleaned be sure to apply lubricating oil to that part after cleaning 1 Cleaning time After six months or 300 hours of operation whichever comes first 2 Cleaning tools Dry cloth soft cloth such as gauze vacuum cleaner 3 Places to be cleaned Table 5 1 lists the places to be cleaned Table 5 1 Place to be cleaned Cleaning procedure Carriage shaft and vicinity Paper travel surface Remove paper waste and wipe off stain dust ribbon waste etc 5 2 Lubrication This printer is designed to be maintenance free and requires no lubrication during normal operation However it is necessary to apply lubricant if the printer is disassembled reassembled cleaned or if parts have been changed 1 Cleaning time Remarks 1 Turn off the power before cleaning 2 Make sure that paper dust does not fall inside of the machine Cleaning period Cleaning points Paper path Paper End sensor Lubricant 6 months of operation or 300 hours of operation whichever is earlier Carriage shaft and surroundings Remove paper and ribbon dust Clean stains and dusts Remove the dust on the sensor P
15. 15 3PP4044 5033P1 Roller holder R 3 6 For ML320 Turbo 53349101 5 10 For ML321 Turbo 53349101 16 4PP4044 5017P1 Change arm lever 1 2 50809501 17 3PP4044 5014P1 Switch lever 1 1 50809601 18 4PP4044 5024P1 Idle gear PLT 1 2 19 2PP4044 5016P1 Change lever 1 2 51238501 20 3PP4044 5023P1 Reset spring D 1 2 50931601 21 3PA4044 5110G1 LF motor assy 1 4 56513601 22 3PP4044 5034P1 Rear pressure roller N 1 2 For ML320 Turbo 53349401 3PP4044 5162P1 Rear pressure roller W 1 2 For ML321 Turbo 53349501 Q ty No Part No Description Q ty Remarks ODA P N Required 23 3PA4044 5025G2 Platen assy N 1 3 For ML320 Turbo 50114801 3PA4044 5159G2 Platen assy W 1 3 For ML321 Turbo 50114901 24 3PP4044 5010P1 Space rack gear N 1 3 For ML320 Turbo 53349601 3PP4044 5156P1 Space rack gear W 1 3 For ML321 Turbo 53349701 25 4PB4025 3377P2 Tension spring for space 1 1 50923502 rack 26 3PP4044 5008P1 Guide rail plate N 1 1 For ML320 Turbo 51022201 3PP4044 5155P1 Guide rail plate W 1 1 For ML321 Turbo 51022301 27 3PP4025 2810P2 Adjust cam 1 1 51238601 28 4PP4044 5009P1 Carriage shaft 1 1 For ML320 Turbo 51114201 4PP4044 5009P2 Carriage shaft 1 1 For ML321 Turbo 51114202 29 3PP4044 5005P1 FG plate L 1 1 30 3PA4044 5050G1 Pull up roller assy N 1 2 For ML320 Turbo 50411001 3PA4044 5165G1 Pull up roller assy W 2 For ML321 Turbo 50411101 31 4PP4044 5115P1 Idle gear L
16. 18 17 16 15 14 13110 9 716 Signal 8V EP oy AC EL F F G 10V OV 6 10 2 No spacing operation The alarm LED Blinks e ls carriage assembly binding or jammed No Yes e Check for dust build up around space motor between the teeth of the space rack back up roller ribbon feed mechanism and carriage frame etc e Replace space motor assy e Remedied No Yes e End e Replace driver board e Remedied No Yes e End e Replace carriage cable 6 11 3 Homing does not end normally Yes No e Check for dust or paper build up around space motor Space rack ribbon feed assembly back up roller carriage frame support protector and ribbon protector e Remedied No Yes End e Replace space motor assy era Replace space motor assy e Remedied No Yes e End Replace carriage cable e Remedied No Yes e End Replace driver board e Remedied No Yes End e Replace control power supply board 6 12 4 Paper jam while paper insertion Jam 1 e Check the ribbon protector e Make sure the pull up roller cover is closed properly Pull up roller cover Platen Paper Ribon Protector p Jam 2 wrinkled paper Check around pressure roller mechanism for the following Front pressure springs are properly installed narrow 3 pcs wide 5 pcs e Tension of all of the front pressure rollers is properly set
17. 3 2 3 5 3 3 2 Ribbon Protector 1 2 Remove the printhead see 3 3 1 Open the pull up roller cover 1 Remove the shim on the carriage frame Loosen the screws holding the carriage assembly to the carriage frame this allows more play between the printhead and the platen Raise and remove the ribbon protector 2 To install follow the removal steps in reverse order Be sure to replace the shim in exactly the same position as it was before disassembly 3 3 3 Pull up Roller Assy 1 Open the access cover 1 2 Lift up the sheet guide Assy 4 to remove 3 Tilting the pull up roller Assy 2 toward the front remove it from the shaft of platen Assy 3 4 To install follow the removal steps in reverse order Note Remove the sheet guide Assy 4 before installing or removing the pull up roller Assy 2 3 3 4 Upper Cover Assy Access Cover Assy and Sheet Guide Assy 1 2 3 4 5 6 7 8 Note Pull off the platen knob 1 Open the access cover Assy 4 toward the front to remove Lift up the sheet guide Assy 5 to remove Turn the change lever 2 toward the bottom position Insert a flat blade screwdriver into grooves of frame 5 places for ML 321 4 places for ML320 and twist to disengage claws of upper cover 3 Raise the front side of upper cover Assy 3 and shift toward the rear to disengage claws of frame 6 places for ML321 5 places for ML320 Raise t
18. 8 kbyte ROM that contains the serial interface control program HM6264 An 8192 byte static RAM used as a message buffer Circuit Description A block diagram is shown in Figure C 2 1 CN1 DILL oma LIE bom Z E O ZZ suk DBO Serial data 5 VD control line 10VAC 9 V power 9 V 10 VAC supply circuit 9 V e Bus line ay gt 5V e Control line gt OV Figure C 2 1 Block Diagram 2 2 1 212 2 Operation at power on After power is turned on an RST OUT signal is sent from the printer control board to reset the printer When the reset is canceled the 80C51 CPU performs initialization Initialization consists of setting the 80C51 timer and setting the serial mode RS 232C interface The DTR SSD TD and RTS signals output by the 80C51 are converted to RS 232C signals by line driver SN75188 Q1 and sent to the interface In addition signals DSR CTS CD and RD on the RS232C interface are converted to TTL level by line receiver SN75189 Q2 and input to the 80C51 2 3 Communication Procedure Flowchart 2 3 1 Mode C Ready Busy Received one character No Yes Is DSR valid No Buffer overflow Yes Yes No No Error Parity error No error Store the received character in buffer Store 40 H in
19. AC inlet 1 and AC switch 2 from the frame guide 3 Disconnect the cable 3 from the connector 4 on the Control Power Supply Board 5 4 Remove a screw 6 and disconnect ground cable 7 5 Remove two screws 8 and shift the transformer Assy 9 to the left and remove it 3 3 17 Change Lever and Gears 1 Remove the upper cover see 3 3 4 2 Release the reset spring 1 from the tab remove it then remove the idle gear 2 the tractor gear 4 and the change gear 5 3 Push back the protrusion of the change gear shaft 6 gently with a flatblade screw driver to remove the change lever 3 Note The change lever can be difficult to remove be careful not to exert too much force with the screwdriver Make sure the springs do not fly offwhen you release the change lever from the shaft 4 To install reverse the removal procedure Note on istallation To insert the change lever into the change gear shaft 6 match the flat surface D cut 3 3 18 Carriage Shaft 1 Remove the printhead see 3 3 1 2 Remove the upper cover see 3 3 4 3 Remove the driver board see 3 3 12 Remove the FG plate L 2 4 Slide the carriage shaft 1 to the left side in the direction of the arrow to remove b To install reverse the removal procedure Note on installation After installation check and adjust the gap between platen and printhead see 4 1 3 3 19 Paper Pan 1 Remove the printhead see 3 3 1 Remo
20. Remove the printhead see 3 3 1 Remove the carriage Assy see 3 3 5 3 Remove the backup roller spring 2 Disengage claws of roller holder from the carriage frame 1 2 places and remove the backup roller holder assy 3 To install follow the removal steps in reverse order Note Small round hole with metal tip on back of roller holder assy 3 should be facing up when installing 3 14 3 3 11 Platen Assy 1 2 3 4 S 6 8 Remove the printhead see 3 3 1 Remove the upper cover see 3 3 1 Remove the pull up roller Assy see 3 3 3 Remove the ribbon protector see 3 3 2 Turn the change lever 1 to the bottom position Push in the lock levers 2 on both sides to unlock the Assy from the frame then rotate them upward 90 Remove the platen Assy 4 from the base frame To install follow the removal steps in reverse order y X 3 15 3 3 12 Driver Board SDDV 1 Remove the upper cover see 3 3 4 2 Remove the two screws 1 and release the driver board 2 by lifting clamp 4 3 Disconnect all cables from driver board 2 4 To install follow the removal steps in reverse order Note on installation Insert sensor lever 3 in the sensor as shown when installing the driver board 2 DER Mo PISS 3 3 13 LF Motor 1 Remove the upper cover see 3 3 4 2 Remove the printhead see 3 3 1 3 Remove the ribbon protector see 3 3 2 4 Remove
21. buffer printer in DESELECT Yes state or is the paper low Is remaining Yes buffer space 256 No Has 200 ms or 1s elapsed after SSD was turned on Yes Turn off the SSD signal Is remaining buffer space gt 256 during receive time out No Yes Turn on the SSD signal gt lt XE Printer busy No Output one character from the buffer to printer Figure C 2 2 2 3 2 Mode X ON X OFF Received one character No Is DSR valid Yes No No Buffer overflow Yes Yes No Error Parity error No error Store the received character in buffer Store 40 H in buffer printer in DESELEC Yes state or is the paper low Is remaining Yes buffer space lt 256 Has 200 ms elapsed after sending DC3 is urned on or has 1 second elapsed No Is remaining buffer space gt 256 during receive time out Yes Yes Printer busy No Output one character to printer Figure C 2 3 Ready to send Ready to send Yes Yes Send DC1 Send DC3 m Y Y 3 1 3 2 TROUBLESHOOTING FLOWCHART Before Repairing a Fault
22. left the stroke length up to the platen is different for each pin Pin coil current Pin 1 2 8 9 Pin 3 6 Time d Simultaneous Compensation of the number of impact pins The MPU is provided with the compensation table for each pin to compensate as necessary Number of impact pins Few 4 Many Drive time Short lt Long 2 10 e Print mode compensation According to the thickness of the printing medium the print mode is compensated as shown in the table below Head Gap Range 1 2 3 4 Print speed 100 95 85 85 Drive time Short lt Long 84 Drive time lengthens at each step 2 1 6 SP LF Motor Control 1 Space motor control The SP motor driver HA13412 drives the three phase brushless motor based on the phase signal SPU SPV and SPW and the speed instruction data from the LSI The MPU can identify the current speed of the space motor by measuring through the LSI the pulse length of the output A B of the slit encoder included in the space motor By comparing the target speed for each print mode with the actual current speed to change the speed instruction data the motor speed is increased or decreased to maintain the specified speed for each print mode SPU SPV n SPW SP t
23. nenea amana 3 14 9 9 11 Platen ASSV 5 anne nee en engen 3 15 3 3 12 Driver Board SDDV eerie a ae 3 16 3 38 18 LF M01022 nike else 3 17 3 3 14 Operation Panel PCB LEOP nenea nenea nana nana 3 18 3 3 15 Control Power Supply Board SDCT sss 3 19 3 9 16 Dranstormer ASSY sites e aceeiasi at aa a ed 3 20 3 3 17 Change Lever and Gears issiima ienei eene 3 21 3 3 18 Carriage Shaft manea anna ana nau aaa 3 22 33 19 Paper Patience Wile nt se 3 23 3 9 20 Real Tractor Ay uu p aceata Ses ca aa ada tatem da o ie l a en aes 3 24 3 9 21 Real Pressure ASSY la coaie anal a ta ee 3 25 33 22 SWITCH LEVEN asninn ca ao eat aa o ni i ai i n ati i es 3 26 4 ADJUSTMENT_ uuu iai a aaa aa a i a igen dt i aaa Aaaa o a al eR ai 4 1 5 CLEANING AND LUBRICATION n nenea nana tenens 5 1 5 1 ere rn a aa ne a sup hed 5 1 5 25 JLUDfICallOTisise dte eee pote reden Ep enne Ra dese Aa i e aa Rua i bd atari retis 5 3 6 TROUBLESHOOTING AND REPAIR nenea nana nana en 6 1 6 1 Items to Check Before Repair 2 22 1 21 92 aka 6 1 6 2 Troubleshooting Table uuu uu nee aa e ies a a a la 6 1 6 3 Lamp DISplay uu on eot n ped nai te dai Data al Ba fat tt oil q 6 3 6 4 Connection Circuit Check for Printhead and SP LF Motor 6 6 6 5 Troubleshooting Flow Chart nea amana ea 6 9 APPENDIX A PCB LAYOUT 22 t Aaa aa a ee ati ada Dal a aaa A 1 B SPARE P
24. pin driving head using a permanent magnet It is attached to the carriage which moves parallel to the platen Electrically this unit is connected to the control circuits through the control board NN Figure 2 2 Arrangement of the head pins View from the tip of the printhead 1 The printhead configuration The printhead is composed of the following parts a b c d e e Wire guide Spring assembly Wire Armature Spring Yoke Spacer Magnet assembly Magnet Core Coil Yoke Printed circuit board Fin 2 Printhead Operation See Figure 2 3 a b When the printhead is idle the armature is attracted by a permanent magnet and the spring fixing the armature is compressed The print wires fixed to each armature are thus concealed under the wire guide When a signal for a character to be printed is detected a current flows through the coil When the coil is activated the magnetic flux caused by the permanent magnet between the armature and the core is canceled to eliminate the attracting force The armature is driven in the direction of the platen by the force of the armature spring The print wire fixed to the armature protrudes from the tip of the wire guide strikes the paper through the ribbon and prints a dot on the paper After the character has been printed the armature is magnetically attracted again and the print wires are again concealed under the wire guide A thermistor in the
25. printhead prevents burning caused by over heating of the coil during extended continuous bi directional printing When the temperature of the coil exceeds a pre determined limit about 119 C the control circuit detects a thermistor signal Printing will then be intermittent or stop completely until the coil temperature falls below the limit value Paper ZET Print wire Printhead Platen 1 When printing Paper Armature assembly Thermistor Print wire iz ZEN Yoke Spacer Magnet assembly 2 When not printing Paper Figure 2 3 2 22 2 2 2 Spacing Operation See Figure 2 4 The spacing mechanism consists of a carriage shaft mounted in parallel with the platen and a carriage frame that moves along the shaft It is driven by a DC motor mounted on the bottom of the carriage frame Items included in the spacing mechanism are as follows a DC motor with motor gear b Carriage frame stationary yoke and motor driver board included c Carriage shaft d Space rack e Sensor f Encoder disk Spacing operation The carriage frame on which the printhead and space motor are mounted moves along the carriage shaft parallel to the platen When the spacing motor rotates counterclockwise the driving force is transmitted to the motor gear As the motor gear rotates the carriage moves from left to right Mechanically it is designed in such a way that for every revolution of
26. the pull up roller Assy see 3 3 3 5 Remove the platen Assy see 3 3 11 6 Remove the driver board see 3 3 12 7 Remove the left FG plate 1 lift base at three points to release tabs 8 Release the lock A to remove the LF motor 2 9 To install follow the removal steps in reverse order Note on installation Press the LF motor cable with a portion a of the motor plate 3 17 3 3 14 Operation Panel PCB LEOP 1 2 3 4 S Remove the upper cover see 3 3 4 Disconnect cable 1 from connector 3 of driver board 2 Disengage claws on both sides from the frame and remove the operation panel 4 Open claws 8 places and remove the operation panel PCB 5 from the operation panel 4 To install follow the removal steps in reverse order 3 18 3 3 15 Control Power Supply Board SDCT 1 2 3 4 S Remove the upper cover see 3 3 4 Disconnect the two flexible cables 3 from connector 2 on the Control Power Supply Board 1 Remove cable 5 from connector 4 on the control power supply board 1 Remove the two screws 6 and remove the controlpower supply board 1 To install follow the removal steps in reverse order Note on installation To install the control power supply board set the change lever to the top position so that the switch lever 7 will not catch on the microswitches 8 3 19 3 3 16 Transformer Assy 1 Remove the upper cover see 3 3 4 2 Remove
27. to the rear position e Does the platen rotate smoothly No Yes e Replace tractor feed assembly e Replace LF motor assembly eri Replace LF motor assembly e Remedied No Yes e End Replace driver board 6 17 9 Malfunction of switch on operation panel e Is the CN1 of Operation panel connected to the CN3 on the driver board Yes No e Connect the cable properly e Replace operation panel board e Remedied No Yes e End e Replace driver board 6 18 10 Data receiving failure e ls the SEL LED blinking No Yes e Printer went into the print suppress mode Wait until printer receives DC1 code or change the menu item Print suppress to Ineffective when the function is not required s Is the I F RS232C No Yes e Go to step e Does the SEL LED light up Yes No e Press the SEL key e Remedied No Yes e Does the printer receive data properly No Yes e Go to step e End D Disconnect I F cable e Does the SEL LED light up No Yes e Change menu item I prime to Invalid or check for defective cable er Replace driver board e Remedied No Yes e End Replace I F cable 6 19 10 2 RS232C I F Printer I F pin assignment Yes Yes u Is the correct cable used TXD 2 pin RXD 3 pin No SSD 11 pin DTR 20 pin e Change I F cable DSR 6 pin Is the ALARM LED blinking Yes e See tables 6 2 and 6 3 for troubleshooting Make sure th
28. 2PA4128 1241G1 Access cover assy W 1 2 For ML321 Turbo 53076801 4 1PP4128 1188P1 Acoustic cover N 1 2 For ML320 Turbo 53076901 1PP4128 1233P1 Acoustic cover W 1 2 For ML321 Turbo 53077001 Figure 11 2 Printer General Assy Figure 11 2 Printer General Assy Tm Q ty No Part No Description Q ty Required Remarks ODA P N 1 2PP4025 2871P20 Platen Knob 1 1 51902220 2 4YA4042 1543G301 Control power supply 1 9 For ODA no ROM 55080801 board SDCT 4YA4042 1543G302 Control power supply 1 9 For OEL board SDCT 4YA4042 1543G303 Control power supply 1 9 For INT board SDCT 3 4YA4042 1549G1 Driver board SDDV 1 9 ROM 55080701 4 4YA4042 1516G3 Operator panel board 1 3 55081103 LEOP 3 5 3PP4044 5360G1 Operation panel w frame 1 2 50221901 assy 6 3YS4011 1315P1 AC cord 1 1 For ODA 56609701 3YS4011 1266P1 AC cord 1 1 For OEL 3YS4011 1329P2 AC cord A 1 1 For INT 3YS4011 1269P1 AC cord for 230V 1 1 7 4YA4023 3301G1 Printhead 9 1 10 50114601 8 4YB4042 1553P1 Fuse 237002 1 10 For 120V 50923102 125V 2A 4YB4042 1552P1 Fuse 217001 1 10 For 230 240V 56307301 250V 1A 9 4YB4049 7103P1 Transformer assy 1 2 56415301 ML320 Turbo 120V 4YB4049 7104P1 Transformer assy 1 2 ML320 Turbo 230 240V 4YB4049 7103P2 Transformer assy 1 2 56415302 ML321 Turbo 120V 4YB4049 7104P2 Transformer assy 1 2 ML321 Turbo 230 240V 10 3PB4050 3429P2 PCB plate 1 2 For 230V OD
29. 4 bits The EEPROM contains menu data The following shows the memory access operation MPU EEPROM EEDIN P P24 gt D1 EECS P P27 gt CS EEDOUT P P25 lt DO EECLK P P26 gt SK PRE O PE X EECS P lE Ps CS EECLK P I d Fa Ls Ld Operation Start code Address code I Fi EEDIN P E SIK A5 AO EEDOUT P s Z X XXX XX gt D15 DO D15 DO D15 Read cycle timing READ BEC t EECS P acl os EECLK P 1 tart Operation Address Data code i cim EEDIN P RU mW SAX SX X DO EEDOUT P M Bus Ready lt twp Write cycle timing WRITE LSI This LSI detects and controls the SP motor speeds by monitoring the two phase sensor signals obtained from the DC motors and modifying the excitation phases as appropriate This LSI is connected in multiplex to the MPU MPU LSI A D bus S P07 ALE RD Oo RDN WRL WRL PO1 LSIC Clockout A0 A19 x Y LSICS ALE D0 D18 Date Read i SE D0 D15 Y Write Address Data WRL Clockout is provided when the original excitation is selected 2 1 3 Initializat
30. A OEL 25 Figure 11 3 Printer Unit Figure 11 3 Printer Unit T i Q ty No Part No Description Q ty Required Remarks ODA P N 1 3PA4044 5002G2 Main chassis assy N 1 2 For ML320 Turbo 53348801 3PA4044 5152G2 Main chassis assy W 1 2 For ML321 Turbo 53348901 2 3PP4044 5012P1 Bottom paper end lever 1 1 50809201 3 4PP4044 5019P1 Pressure spring F 3 2 For ML320 Turbo 50931301 4PP4044 5019P2 Pressure spring F 5 4 For ML321 Turbo 50931302 4 4PP4044 5031P1 Roller holder F 3 6 For ML320 Turbo 53349001 5 8 For ML321 Turbo 53349001 5 4PA4025 3327G2 Front pressure roller assy 3 6 For ML320 Turbo 50410901 5 8 For ML321 Turbo 50410901 6 3PP4044 5015P1 Front release gear shaft N 1 2 For ML320 Turbo 51114001 3PP4044 5157P1 Front release gear shaft W 1 2 For ML321 Turbo 51114101 T 1PP4044 5021P1 Paper pan plate N 1 2 For ML320 Turbo 53399201 1PP4044 5158P1 Paper pan plate W 1 2 For ML321 Turbo 53349301 8 3PP4025 3320P2 Leaf spring N 1 2 For ML320 Turbo 50923002 3PP4025 3507P2 Leaf spring W 1 2 For ML321 Turbo 50923102 9 3PP4044 5011P1 Paper end lever 1 1 50809301 10 3PP4044 5013P1 Sensor lever 1 1 50809401 11 4PP4025 3340P1 Change gear 1 2 51228001 12 3PP4025 3341P1 Tractor gear 1 2 51228101 13 4PP4044 5020P1 Pressure spring R 3 2 For ML320 Turbo 50931401 3 2 For ML321 Turbo 50931401 14 4PP4044 5163P1 Pressure spring W 2 1 For ML321 Turbo 50931501
31. ARIS PISI ce se taca een ad a Pea ta aa B 1 C RS 232C Serial Interface Board OPTION uy u nene nene nana ana C 1 pEC IICIM add ast C 1 2 Operation Description accetto E Helene C 2 3 Troubleshooting Flowchart L UU eee nenea nenea nenea nenea C 7 1 CONFIGURATION 1 1 Standard Printer Configuration This printer consists of the following assemblies Sheet guide assy Na Platen knob I Access cover assy I Traansformer assy Pull up roller assy Control Power supply assy Driver board au SA lt Operation panel assy Main chassis assy Figure 1 1 Configuration 1 2 Options 1 Cut sheet feeder unit CSF Single bin CSF 2 Pull tractor assy Bottom push tractor unit 3 Roll paper stand Narrow only 4 Serial I F S RS 232G THEORY OF OPERATION Electrical Operation This section describes the electrical operation of the printer circuit Summary Fig 2 1 shows the block diagram of the printer The control board is made up of the microprocessors peripheral circuits drive circuits sensors and interface connectors The power to the control board is supplied by the power board through the connector cord The power to other electrical parts is also distributed through the connectors within the control board Microprocessor and the Peripheral Circuit 1 Microprocessor Q7 67X640 This processor is a CMOS
32. ARK QUIET C cs 8 MENU SHIFT Micro Feed Micro Feed TOF Down Up CHARACTER PITCH 10 12 15 EXIT GROUP ITEM SET PRINT SE E um POWER ALARM MENU RESET I gt PROF Figure 6 1 peog 01 U00 JO p eog 4 1 aoejday 440 swooz NO Sut00Z pJeog 4 ees UJOJJ U0l 9691 ON dn siufr q31 yug Ga pajunow jou pieog 4 eoejdey 40419 luUAVDE SLI wieje pieoq 4 1 uo WIV peog 4 1 40 P eoq 4 uo WOH 9oe ded 40119 WNS YIAUD wueje NOH pueog 4 eoe deH 40419 IM PEOY wee WVH reuay AdIN NHVIV JOVIHILNI WIYAS p eog Alddns 1 M0d 101 U02 10 NOH 89e dau dn pexoo NdIN 01 enp pejoelep s eyep 4444 wee UONONUISU YY p eog Ajddns samod o44u07 8 e da 10 NO pue 440 18mMod y win l8A MOJ 1d y S NAW JO HOd INN wueye euis INN pieog Ajddns semog OUOD eoejdaJ 10 NO pue 440 Jomod ou uin SUIG9 Jaye 1 S9 1 SOI y pue dn pexoo s Nd wueye jnoow L oq yorem LAM INaviv NOILO3 13Q JaHvMNmNHIA p eog Ajddns 480g Nomuo a95e dau p eog Ajddns 19Mod O4JUOD a95e dau ejep speal NdW U8UM uonoeaJ ON 40419 lUAVDE SLI wieje WOHd33 wee p eog J031u02 UO NvH p eog Ajddns Jamo q 041 u09 10 NOH eoejdeu 40119 WNS YO8YD O O O O O O uueje NOH weu old p eog Ajddng 19Mod N104U09 eoe deu ONILOOHSFIANOHL 10119 luw DE LJ S dVvINdu oz ZL SL
33. F 9 1 4 51238701 32 4PA4044 5041G2 Tractor frame assy R 1 2 53350302 33 4PA4044 5043G2 Tractor frame assy L 1 2 53350202 34 4PP4025 3335P3 Drive shaft tractor N 1 2 For ML320 Turbo 51114403 4PP4025 3335P4 Drive shaft tractor W 1 2 For ML321 Turbo 51114404 35 3PP4044 5046P1 Tractor sheet guide 1 2 For ML321 Turbo 51022901 36 4PB4044 5095P1 FG plate A 51022401 Figure 11 4 Carriage Assy Figure 11 4 Carriage Option Assy No Part No Description Q ty med d Remarks ODA 1 4PP4044 5061G1 Carriage frame set 1 2 53349801 2 3 4PA4025 3718G1 Back up roller holder assy 1 2 53343201 4 4PP4025 3398P1 Guide roller 1 2 53341901 5 3PP4044 5065P1 Guide roller holder 1 2 53350101 6 4YA4044 5100G1 Space motor assy 1 4 56513701 7 3PB4044 5506P1 Head cable 9N 1 5 For ML320 Turbo 56633801 3PB4044 5507P1 Head cable 9W 1 5 For ML321 Turbo 56633802 8 3PB4044 5125P1 15 pin connector 1 2 56731301 9 3PA4044 5070G1 Gear cace assy 1 3 51238801 10 3PP4044 5068P1 Head clamp 1 1 50709001 11 4PP4044 5067P1 Head plate 1 1 51022501 12 3PP4044 5064P1 Ribbon protector 1 2 53077101 13 4PP4025 3397P1 Back up roller holder spring 1 1 50925001 14 4PP4044 5066P1 Guide roller spring 1 1 50931801 B 10 Pull Tractor Bottom Tractor I F Board Figure 11 5 Option Spare Parts Figure 11 5 Option Spare Parts i Q ty N
34. N TROUBLE EXPLANATION SEL MENU 10CPI SHOOTING OPERATOR ALARM Paper end alarm OFF From cut sheet or bottom paper end Set New paper Paper change lever alarm Change lever is setto TOP position while paper is already inserted from rear or bottom Set the lever to specified position Check rear sensor lever Replace Control Board Paper jam alarm Cut sheet could not be ejected Cut sheet could not be fed properly Remove the paper or check feed Mechanism Press SEL key Print Head thermal alarm Print head temperature exceeds 119 C Wait until it is cooled Replace P H or Driver Board Space motor thermal alarm Temperature of space motor exceeds specified value It is recovered automatically Replace SP motor or Driver Board FATAL ALARM Note See Table 6 3 Hardware Alarm has occurred See Table 6 3 BLINK1 400ms ON 400ms OFF BLINK2 200ms ON 200ms OFF LED is kept in Current Condition no change 2 Fault alarm display When the printer detects any of the various alarm states the information is displayed as shown below on the operation panel The alarm is specified by lamp combination of PRINT QUALITY and CHARACTER PITCH See Table 6 3 for details PRINT QUALITY SEL HSD UTILITY L 1 SEL LF FFAOAD TEAR P
35. an motor oil or equivalent PM Molicort or equivalent EM 30L Amount of lubricant Medium amount A Apply three to four drops of oil or 0 008 inch 0 2 mm thick grease Small amount B Areas to Avoid No 1 Do not lubricate Platen assembly rubber face Pressure roller rubber face Carriage shaft Ink ribbon image Pin tractor Flexible cable and crack Motor PCB Connector terminals Apply one drop of oil 0 006 0 002 g Reason To prevent stained paper and illegal paper feed To prevent stained paper To stabilize carriage traveling load To prevent blurring of print To prevent stained paper To prevent loose connection To prevent loose connection To prevent loose connection Remarks Be careful not to put grease on the rubber face of the pressure roller 5 Lubrication point 1 Ribbon feed gear Assy Drive gear shaft upper and lower Planetary gear shaft PM B 0 006 0 002g upper and lower EM 30L A Idle gear shaft upper and lower PM B 0 006 0 002g 2 Space rack Space rack Rack upper side Approx 35 greasing range n EM 30L A Approx 30 greasing range 3 Platen Assy Contact face of the platen shaft Bias gear and platen FG spring EM 30 L B Grease the contact face of platen gear L and bias gear PM B Platen gear L 4 Tractor driving mechanism Change lever
36. an stop at a position very close to the printhead 0 tear off position to start printing at the top of the sheet without causing it to crumple or curl up Printing starts at the top of the sheet and continues uni directionally until the top edge of the sheet gets to the inside of the pull up roller cover After that printing continues bi directionally Platen Ribbon protector Printhead Carriage frame assembly Figure 2 16 2 2 7 Automatic Sheet Feed This function is used to feed in the sheet automatically up to the print start position when the cut sheet or the continuous sheet paper is used Operational procedure 1 When using cut sheet paper 1 2 3 4 Set the change lever to the TOP position See Figure 2 17 Insert a sheet of paper between the platen and the paper chute After the lapse of time selected by the wait time item in the menu the LF motor starts to feed the paper up to the print position When the default is selected the paper feeds up to the position 0 35 inches first dot position from the top edge of the sheet However the 0 tear off mechanism allows printing at the top edge of the sheet by changing the TOF position Sheet setting d Time out V Detection timer Time selected on the menu LF action y y 7 OO REAR SW1 TOP BOTTOM TOP BOTTOM REAR
37. aten The rotation of the idle gear is transmitted to the drive gear and paper is fed when the sheet feeder shaft turns the pull tractor Continuous sheet form Pull Tractor assembly Drive gear Idle gear NO HE LF motor FA Platen Platen gear LF Idle gear Figure 2 12 6 Bottom push feed operation Option See Figure 2 13 The bottom push feed of continuous sheet requires the bottom tractor feed unit When the platen turns its rotational force is transmitted through the tractor idle gear and the tractor change gear to the tractor drive gear of the bottom push tractor and paper is fed to the print start position Platen Platen gear Change gear Idle gear Tractor change gear Tractor idle gear i Tractor drive gear Figure 2 13 Paper clamp mechanism See Figure 2 14 When setting the change lever to the BOTTOM TOP or REAR position the operation of the front release gear arm changes according to the position of the release cam At the same time the position of the cam relative to the front release gear arm changes opening or closing the pressure roller Position of change lever BOTTOM Front pressure roller Rear pressure roller TOP REAR TOP BOTTOM REAR Change lever Release cam Platen Front release gear arm 2 2 6 Paper Detection Mechanism See Figure 2 15
38. cation 0 3mm or more Drawing Adjust lever Contact Touching i Motor PCB Adjustment method Verify the following Make sure that the gap between the con tact and the motor PCB is 0 3 mm or more At the time of printing test make sure that the contact touches the motor PCB and it enters reduced speed mode when the adjust lever is set to range 2 and 4 Specification Gap between the platen and the paper pan Platen Gap between the platen and the pressure roller Front pressure roller Drawing Change lever Bottom Friction position is Rear Bottom position Change lever Center friction Bottom p i 4 Paper pan Pressure roller Adjustment method Verify the following 1 When the change lever is set at Friction position the gap between the platen and the paper pan at the rear side shall be 1 0 5mm When the change lever is set at Rear or Bottom position the gap between the pla ten and the paper pan at the front side shall be 1 0 5 mm Verify the following 1 When the change lever is set at Friction position all the pressure rollers shall be pressed to the platen When the change lever is set at Rear or Bottom position the gap between the pla ten and the pres sure roller at the rear side shall be 3mm The front pressure rollers shall be pressed to the platen Rotation of the push tract
39. d of the justment Variation of platen value at the left the center Adjustment method and the right shall be less 1 Gap between the than 0 02 mm platen and the printhead at the left end and the right end shall be adjusted by rota Adjust cam ting the adjust cam After adjustment mark the adjust composition with a red pen Set the adjust lever at the Marking Range 1 Press the adjust gear downward in direction A to push the adjust gear and the adjust gear out of mesh Adjust the gap by 2 Initial adjustment 0 41 0 03 mm rotating the adjust screw in direction B or C while the Carriage shaft adjust lever and the adjust gear Platen are disengaged After adjustment mark the adjust cam position with a red pen Adjust lever Adjust gear Adjust screw Adjust cam Adjust gear Measure variation of gap when range is changed Specification Adjust le Adjust cam Gap 0 69 0 05 at the range 5 Drawing Adjust lever Adjust spring ZZZZZZZZZZZZZZZZZ ZZZZZZZZ ay Click of platen gear R Printhead Adjustment method Note 1 The head gap shall be measured with the change lever set to rear position Note 2 The head gap shall be measured positioning the platen gear R craw on the top Note 3 Move the adjust screw in clockwise direction in direction B to measure Gap between the con tact and the monitor Specifi
40. e parameters for RS232C in the menu are correct Baud rate N Bit length Parity Protocol Busy signal and its polarity Remedied Yes Driver Board End Is 8V supplied on driver board s 20 CN2 1 i Pal ea sua OV pin10 Remove RS232C I F board 8V pin20 e Is the 8V supplied on the Driver board No Yes e Replace RS232C I F board e Replace driver board er Replace RS232C board Remedied Yes e End Replace driver board A PCB LAYOUT PCB list 1 Circuit board SDCT Control Power Supply 2 Circuit board SDDV Driver 3 Circuit board LEOP 3 Operation Panel gt D D 2D DS SD DS B SPARE PARTS LIST ik Sy Figure 11 1 Upper Cover Assy Figure 11 1 Upper Cover Assy Q ty No Part No Description Q ty Required Remarks ODA P N 1 1PP4128 1186P6 Upper cover N 1 2 For ML320 Turbo For INT 1PP4128 1186P4 Upper cover N 1 2 For ML320 Turbo For OEL 1PP4128 1186P2 Upper cover N 1 2 For ML320 Turbo 53076502 1PP4128 1231P6 Upper cover W 1 2 For ML321 Turbo For INT 1PP4128 1231P4 Upper cover W 1 2 For ML321 Turbo For OEL 1PP4128 1231P2 Upper cover W 1 2 For ML321 Turbo 53076602 2 1PA4094 7305G10 Sheet guide assy N 1 2 For ML320 Turbo 51009409 1PA4094 7308G11 Sheet guide assy W 1 2 For ML321 Turbo 51009510 3 2PA4128 1237G1 Access cover assy N 1 2 For ML320 Turbo 53076701
41. ed in Section 3 3 1 1 are completed and power is turned on the serial interface checks the message buffer memory and interface driver receiver circuit It then prints characters To start and stop this test push the SEL button on the front of the printer Details of this test are explained on the next page edi The program revision using two numerical characters is printed LOOP TEST is printed Memory is checked for the message buffer Prints OK is printed if the memory check is OK and BAD is printed if the memory check fails Output level to DTR RTS and SSD signals is dropped low If DSR CTS or CD signals is High IF BAD is printed If DSR CTS and CD signals are all Low IF OK is printed Output level to DTR RTS and SSD signals is raised high If DSR CTS or CD signals is Low IF BAD is printed If DSR CTS and CD signals are all High IF OK is printed Transmits characters codes from 20H to 7FH is transmitted by SD signal At the same time characters are received by the RD signal and stored in the message buffer The characters that were stored in the message buffer as indicated in 7 are printed Steps 1 through 8 are repeated until test is interrrupted C 12 OKIDAIA Microline 320 321 Turbo Service Manual Part Number 59273701 Printed in the USA
42. eet switching mechanism See Figure 2 8 Three different paper paths can be selected and set by the change lever a TOP for cut sheets When the cut sheet paper is used in the manual mode or fed by the CSF option set the change lever at the position marked TOP Operation The driving force of the platen gear R is transmitted to the idle gear by setting the change lever to the TOP position However this causes the idle gear to be disengaged from the change gear leaving it free At this time the pressure rollers at the rear and the front are pressed securely to the platen to feed the sheet At the same time he cut sheet detection lever turns on the cut sheet detection switch to confirm to the control board that you are in the cut sheet mode In the cut sheet mode the control board automatically feeds the sheet up to the print start position after pausing for the wait time stored in the menu REAR Continuous sheet from push tractor When the change lever is set to REAR position the change gear is engaged with the idle gear and the tractor gear to transmit the rotation of the platen to the push tractor shaft and the paper is fed from the push tractor Atthe same time the switch lever turns on the rear switch to inform the control board that you are in the continuous sheet mode c BOTTOM Continuous sheet from bottom feeder option When the change lever is
43. el to inform the host that the data is being processed and outputs the RXD signal to inform the MPU of data reception The data is read upon receiving the RD N signal from the MPU When the data processing ends the BUSY signal is set to off and the ACK N signal in sent to request the next data When reception is impossible because the buffer is full the BUSY signal is sent to stop data transmission Data 1to8 STROBE BUSY ACK RXD CN1 Y BUSY gt ACK N LSI Receive Data NBSY D A D bus lt ACK pi NSTB RXD P16 lt NRXD 500ns max STB N 2 1 5 Print Control Print data is transmitted as parallel data IHEAD1 HEAD9 from the LSI to the print head The LSI generates the print timing and drive time Control Power Supply Board Driver Board MPU LSI A D bus DRIVER Print Head Print Data Print Data HEAD1 N HEAD1 HEAD9 N HEAD9 HEAD DRIVE TIMING CHART DT1 DT2 HEAD x Xf x DRIVE CURRENT Print Compensation Control The print compensation methods are shown below a Voltage compensation See 2 1 8 Alarm Circuit b Temperature compensation See 2 1 8 Alarm Circuit c Pin stroke compensation Platen Print Head As shown in the drawing
44. h data and output the LED data through the operation panel control LSI IC1 BU51489S LSI es OPTXD gt 77 OPCLK OPCK s gt Command LED driver OPCLR N and Data NPA2 gt latch 80 OPRXD OPRD lt 79 5V Switch controller A 2 byte 15 bits 1 even parity bit command signal OPTXD is transmitted to the LSI BU5148S in synchronization with the OPCLK signal The LSI decodes this command and when it is found to be legal returns a 2 byte command response back to the LSI which includes data on Switch information LED status receive command ACK NAK and 1 odd parity bit Any transmission errors found cause the command to be reissued after the transmission of the OPCLR N signal 2 15 pueuiuioo eui BuipooS p uoj q pauNjes eq ueo suods y ey os paxi eje euBis QXHdO 9ul JO ud 01 0 4q eui sneo q si SIU euin uues eui 1e ndino eje suods i pueuiuloo eui pue pueululoo au ey ees UBD NOA aAoge uonNensnijll y uioJ4 910N A puooes esuodsei pueuuioo y A s114 esuodseJ puewwog X re 9 ON zug I I I I I T I oud j l l l I x l say puewwog b A T l I l
45. he upper cover Assy 3 to remove To install follow the removal steps in reverse order on installation Match the posts A at both sides of the sheet guide 5 with the arrow marks on the upper cover Push the guide into the cover 3 3 5 Gear Case Assy 1 D 5 6 Remove the printhead see 3 31 Remove the shim from the cariage frame Remove the upper cover see 3 3 4 Move the carriage Assy to right side remove two screws 1 then remove the carriage Assy Disengage claws on the gear Assy 4 places Using a flat blade screwdriver push to widen the claw for easy disengagement Lift up the gear case Assy 3 and release the carriage cable from the cable clamp of the gear case Assy To install follow the removal steps in reverse order Be sure to replace the shim on the carriage frame in exactly the same position as it was before disassembly Notes on installation 1 2 To assemble align the direction of the SP motor axis 4 with the Gear Hole of the Gear Case assy Be sure to check and adjust the gap between platen and printhead see 4 1 3 3 6 PC Connector 1 Remove the upper cover see 3 3 4 Remove the printhead see 3 3 1 Remove the shim from the carriage frame Remove the gear case Assy see 3 3 5 Remove the PC connector 1 from the space motor Assy 2 To install follow the removal steps in reverse order Be sure to replace the shi
46. heck Before Repair 1 Check the inspection items specified in the instruction manual 2 Find out as many details of the problem as possible from the customer 3 IN the shop inspect under conditions as close as possible to those at the time the trouble occurred 4 Proceed with the repair as follows Check the trouble status according to Table 6 1 for the details of the trouble Then isolate the problem according to the detailed flowchart 5 Carry out a thorough test after the repair to check for correct functioning 6 2 Troubleshooting Table Table 6 1 Status Symptom Troubleshooting Probable Cause Flowchart No Power is not supplied Control Power Supply Board Driver Board Transformer Assy Space Motor Carriage Cable Trouble upon Printhead power on Space Motor Carriage Cable Homing does not end normally Control Power Supply Board Driver Board Spacing Mechanism Pressure Roller Mechanism Pull Up Paper jam while paper insertion Roller Cover Printhead Driver Board Space Motor Carriage Cable Printhead Ribbon Feed Assembly Driver Board Trouble during Ribbon Feed Assembly Space printing Motor Driver Board LF Motor Platen Assy LF Mechanism Driver Board Malfunction of switch on operation panel Driver Board I F Board I F Cable Data receiving failure Menu Setting 6 3 Lamp Display 1 Printer mode display Table 6 2 ALARM CATEGORY ALARM LED CONDITIO
47. ing The operator can press the SEL button to turn off the alarm LED then press the PARK button to continue the park function This operation is required when the paper to be parked is more than 19 inches long 3 1 ASSEMBLY DISASSEMBLY This section explains the procedures for removing and installing various assemblies and units in the field Description is mainly limited to the removal procedure installation should basically be performed in the reverse sequence of the removal procedure Precautions for Parts Replacement 1 AC outlet N Q SS SS Remove the AC power cord and the interface cable before disassembling or assembling a Turn off the power switch Remove the plug of the AC power cord from the outlet Remove the power cord from the receptacle on the printer b To reconnect the power cord connect it to the recptacle on the printer first then plug it into the outlet Power cord Do not disassemble the printer as long as it is operating normally Do not remove unnecessary parts and limit the extent of disassembly as much as possible Use the designated service tools Carry out disassembly in the prescribed sequence otherwise damage to the parts may result It is advisable to temporarily install screws snap rings and other small parts in their original positions to avoid losing them Whenever handling the microprocessors ROM RAM IC chips and boards do not use gloves tha
48. ion This printer is initialized when the power is turned on or when the I PRIME N signal is input from the host side via the parallel interface For the initialize operation the RST N signal is first output from the reset circuit to reset the MPUs and LSIs When resetting ends the program starts and the LSIs are reset by MPU via LSIRST N Reset operation by I PRIME starts the program to initialize but does not reset the MPU The program sets the mode of the LSI including the MPU checks the memories ROMs and RAMs then carries out carriage homing and determines the LF motor phase Finally the program establishes the interface signals P I F ACK P signal sending and S I F BUSY N signal off and lights the SELECT lamp When the ready state is set the host is informed that the printer is ready to receive data C MPU RESET MPU Initial Setting Internal RAM CHECK ROM CHECK LSI RESET External RAM CHECK LSI Initial Setting and I F Busy ON RAM Clear Carriage Homing LF Motor Phase Initialization Serial j Parallel I F I F I F BUSY OFF I F ACK Send 2 1 4 Parallel Interface Control The parallel data input from the host to the interfaced LSI is latched to its internal register at the falling edge of the STROBE N signal At the same time the LSI sets the BUSY signal to the high lev
49. lt control circuit Yes Is pin 1 SSD signal of Q3 High level e No Replace the Q3 Yes Is pin 11 SSD of Q1 low level e No Replace the Q1 or the CN1 connector Yes Is the RxD of Q3 as specified in Figure C 3 4 cT TS TET ET E IER x RxD 45 oV ST bit SP bit 5V SSD 45 OV Figure C 3 4 e No Replace the Q2 Yes Replace the Q3 2 In receiving by serial interface printing data is omitted or printing operation is not performed e Are RxD and SSD of Q3 as specified in Figure C 3 4 e No Replace the Q2 U Yes Are WR and BUS signals of Q3 pin 3 as specified in Figure C 3 5 542ns WR lt gt 5V ov Q3 3 sv ov Figure C 3 5 e No Replace the Q3 U Yes Is the level of BUS signals at Q7 pins 2 9 the same as that of DB0 7 when WR signal is started e No Replace the Q7 Yes Is4 pin of Q6 identical to WR signal in Figure C 3 5 e No Replace the Q6 EH Yes Check Q501 in the SDDV PCB C 10 3 3 Local Test 3 3 1 Circuit test mode 3 3 1 1Setting 1 Diagnostic test set by menu 2 Test connector Connect the test connector shown in Figure C 3 6 to the interface connector CN1 on the LXH1 board TD 2 3 RD 4 RTS 5 Equivalent to Cannon DB 25P CTS 8 CD 11 SSD Ton DTR 6 DSR Figure C 3 6 Test Connector Connection Diagram 3 3 1 2Function After the settings outlin
50. m on the carraige frame in exactly the same position as it was before disassembly Notes on installation 1 2 Do not touch the space motor 2 or terminals of PC connector 1 Also take care to avoid dust or foreign matter After installation check and adjust the gap between platen and printhead see 4 1 3 10 3 3 7 Space Motor Guide Roller Assy 1 N Q SS SOS SS co Remove the printhead see 3 3 1 Remove the upper cover see 3 3 4 Remove the gear case Assy see 3 3 5 Remove the PC connector see 3 3 6 Remove screw 2 then the guide roller Assy 3 from the space motor Assy 1 Push down on the carriage cable and remove it Remove the two screws 5 from the space motor Assy Remove the space motor To install follow the removal steps in reverse order Notes on installation 1 2 3 4 Do not touch the terminals of space motor 1 Also take care to avoid dust or foreign matter When installing the guide roller Assy 3 push portions A and B against the space motor 1 When installing the space motor 1 align the face C with carriage frame 4 and push portion D against the frame After installation check and adjust the gap between platen and printhead see 4 1 3 11 3 3 8 Space Rack 1 2 3 4 5 6 7 a ne Py O 8 Remove the upper cover see 3 3 4 Remove the printhead see 3 3 1 Remove the shim from the carriage frame Remove the gear ca
51. n after pausing for the wait time stored in the menu Stepping motor LF motor Pressure roller Sat Platen Platen gear LF Idle gear Figure 2 9 3 Continuous paper feed operation Rear See Figure 2 10 The force transmitted to the platen turns the tractor gear by means of the platen gear the idler gear and the change gear The rotation of the tractor gear turns the sheet feeder shaft which moves the pin tractor belt feeding the paper Zo 0 O oo fen Pa ZB C tt ty g de SL En KG z gt RUG Z V Z Av 5S a gt Paper GS o 0 o Idle gear G k 1 Change gear Figure 2 10 4 Pull tractor option and push tractor operation See Figure 2 11 This mechanism supports the standard push tractor and an optional pull tractor It can perform forward and reverse feed by sending paper either to the push tractor for rear feed or to the pull tractor for bottom feed The rotation of the platen is transmitted to the push tractor and the pull tractor Paper can be fed to either tractor Pull tr r ull tracto Drive gear Idle gear Platen gear Figure 2 11 b Pull tractor mechanism option See Figure 2 12 Bottom feed of continuous sheets is possible only when the optional pull tractor unit is installed The rotation of the platen is transmitted to the idle gear of the pull tractor unit through the platen gear at the left end of the pl
52. nv asi 8 91 99A IV a gt r ZHN 88221 2 2 2 Program ROM This is a 256 x 16 bits 4M bit MAX EPROM with the control program for the printer stored The MPU executes instructions under this program The program ROM is assigned to the program memory area of the MPU and is fetched by the PSEN signal of the MPU The following shows the operation of the memory access MPU ROM A0 A17 gt D0 D15 PG N CSO p ICE PSEN p q OE MPU CLOCK A0 A17 x Pi X x PG N N uu TC x GENE ux g Program Program Program D0 D1 gt IN IN IN 3 RAM MSM51C464A 80RS The RAM is CMOS dynamic RAM with 64K x 4 bit x 2 configuration and used as buffers such as receiving buffer printing buffer DLL buffer and working buffer The following shows examples of the memory access operation MPU RAM 1 Q3 A0 A7 RAM 2 Q4 PO3 P O RAS CS1 p O CAS D0 D3 AN RD o O OE Clockout T1 T2 T3 A0 A7 X X CS1 CS4 NT D0 D7 Read WRH WRL ZF DO D7 Write 8 bit bus byte instruction Clockout is provided when the original excitation is selected 4 EEPROM The EEPROM is a CMOS serial I O type memory which is capable of electrically erasing and writing 1 02
53. o Part No Description Q ty Required Remarks ODA P N 1 4PA4025 3608G1 Pull and bottom 1 2 50098001 tractor assy L 2 4PA4025 3603G1 Pull and bottom 1 2 50097901 tractor assy R 3 2PP4128 1239G1 Tractor cover assy N 1 3 For ML320 Turbo 53077201 2PP4128 1243G1 Tractor cover assy W 1 3 For ML321 Turbo 53077301 4 1PA4128 1277G1 Bottom push stand L 1 2 51902301 5 1PA4128 1277G2 Bottom push stand R 1 2 51902302 6 4PP4094 7385G1 Paper knife N 1 1 For ML320 Turbo 50098701 4PP4094 7386G1 Paper knife W 1 1 For ML321 Turbo 50098801 4 4YA4021 1050G1 LXHI PCB RS232 I F 1 3 B 12 APPENDIX C RS 232C SERIAL INTERFACE BOARD 1 GENERAL This section describes the operation of the RS 232C Serial Interface board installed in the Printer as an option using a start stop synchronization and serial communications circuit This serial interface board is capable of transmitting and receiving simultaneously at speeds up to 19 200 bits per second Two protocols are available printer Ready Busy and X ON X OFF modes 2 1 2 2 OPERATION DESCRIPTION Element Description 1 S 80C51 with MASK ROM An eight bit microprocessor controller that controls the following a Serial interface protocol and data transfer through a serial port b Message buffer c Transmission of parallel data to the printer SN75189 An RS 232C standard line receiver SN75188 An RS 232C standard line driver 2764 An
54. or Backlash between gears Specification Change lever Center friction Slight backlash Approx 0 05 to 0 11 mm Drawing Push tractor Tractor gear Adjustment method Verify The tractor gear shall rotate smoothly when the change lever is set at Friction posi tion Verify There shall be slight backlash between gears to allow smooth rotation of gears Backlash 0 05 to 0 11 mm No Item Specification Drawing Adjustment method Ribbon feed Verify Ribbon shall be fed smoothly when the carriage is moved from side to side Ribbon feeding s Running load to spac 250g or less Verify ing mechanism without a rib bon cartridge Ribbon Make sure that the power is turned off at the time of measure measurement ment portion cartridge Engagement of the double gear and the LF motor idle gear of the Platen Assy Specification LF Motor idle gear Bias gear Drawing Platen gear L Adjustment method Verify The idle gear of the LF motor and the platen gear L and the bias gear of the platen shall be in mesh in such way that the platen gear L and the bias gear rotate against each other to pinch the teeth of idle gear The idle gear stays in mesh with the platen gear L and the bias gear and not locked The bias gear and the platen gear shall be staggered by one tooth as shown in the drawing 5
55. ruth table HALL AMP INPUT OUTPUT SPU SPV SPW U V W H H L OPEN L H H L L L OPEN H H L H L H OPEN L L H OPEN H L L H H H OPEN L L H L H L OPEN 2 12 2 Encoder disk In the operation of the spacing motor the PHASE A and PHASE B signals are generated when the encoder disk interrupts the photo sensor The LSI divides these edge pulse signals in accordance with the print pitch and sends the IPT signal to provide dot on timing and carriage position detection timing SPU SPV SPW PHASE A L L PHASE B 1 720 UTILITY MODE IPT 10 CPI lt 1 120 u IPT 12 CPI lt 1 144 EN IPT 15 CPI lt 1 180 mm IPT 17 CPI NETTEN IPT 20 CPI lt 1 240 n 2 13 LF motor control The LF motor driver MTD2005F drives the LF motor in two phase or 1 2 phase bipolar based on the phase changeover data and the output current data from the LSI The data from the LSI is processed by a specific register contained in the LF motor driver to measure the overdrive time and to change the phase PHASE A PHASE B FORWARD REVERSE 2 14 2 1 7 Operation Panel The clock synchronization OPCLK signal of the LSI is used to input the switc
56. se Assy see 3 3 5 Remove the space motor Assy see 3 3 7 Remove the spring 1 Disengage the claw on left side of space rack 2 from the frame and remove the space rack 2 in upper direction To install follow the removal steps in reverse order Be sure to replace the shim on the carraige frame in exactly the same position as it was before disassembly Note on installation After installation check and adjust the gap between platen and printhead see 4 1 3 12 3 3 9 Carriage Cable 1 Remove the upper cover see 3 3 4 Remove the printhead see 3 3 1 Remove the shim from the carriage frame Remove the gear case Assy see 3 3 5 Remove the space motor Assy see 3 3 7 Remove the two screws 1 release the driver board 2 and PCB board 9 by lifting clamp 8 and disconnect cable from connector 3 4 5 6 Remove the carriage cable 7 from fasteners on frame To install follow the removal steps in reverse order Be sure to replace the shim on the carraige frame in exactly the same position as it was before disassembly Notes on installation 1 2 Take care not to fold the carriage cable 7 during installation Curve the carriage cable 7 slightly when assembling into the fasteners Make sure that the paper end lever A will not contact the paper end sensor 10 when installing the driver board 3 13 3 3 10 Backup Roller Holder Assy 1 2 3 4 Remove the upper cover see 3 3 4
57. set in the BOTTOM position the rotation of the platen is transmitted to the drive gear of the bottom tractor feed unit through the idle gear to feed the sheet which set in the bottom tractor feed At the same time the switch lever turns on the bottom switch to inform the control board that you are in the continuous sheet mode Correlation in Mechanism Mechanism Rear Bottom Tractor Sheet Lever Switch Switch Gear Insertion Position Manual automatic Rotate CSF Operation SW or instruction Operation SW or instruction Rotate Rotate Rotate Operation SW BOTTOM or instruction Control Power supply Assy Bottom switch Change gear shaft Change lever Release shaft BOTTOM Change lever mm Q Tractor gear Change gear Platen gear R Reset spring Idle gear Bottom tractor unit Figure 2 8 2 Cut sheet feeder operation See Figure 2 9 The pulse motor used for the paper feed mechanism is mounted on the left of the frame and the rotation of the motor is transmitted through decelerating gears LF idle gear platen gear to the platen When using cut sheet paper the change lever must be in the TOP position to grab the paper while disengaging the push tractor When the change lever is set to the TOP position the paper is automatically fed in up to the print start positio
58. single chip computer with integrated peripheral device functions and a 16 bit MPU core all OKI original architecture The processor has a 20 bit address bus and a 16 bit data bus It is capable of accessing up to 1M word program memory and 1M bytes of data memory The following characteristics are also provided Built in type data memory of 512 bytes 8 bit 4 channel A D converter x 1 16 bit automatic reload timer x 2 8 bit serial port x 2 8 bit parallel port x 3 bitwise I O specification available And others The function of this microprocessor is to provide a central mechanism for the entire printer by executing the control program through the LSI and driver circuits 11 ua UNEIV 4IS uue v dH L z e1nBi4 No110 uueiv u 1ndui Ov Jopoou3 dz A Ov esnj JeAup 31 wrje qS JeAup dS n dS uue v dH pues Jaded jou 489 ido JeAup pe H S d l eleg IS 1 leues JOWJOJSUBI IBAST O9A lt a 4 DIAIQ ang 4 Mp yesoy 13534 44 4 x HOA S MOA9 u yon Op unu 1JJO ISAOd ba TANVd NOILVH3dO HOSN3S dd Josueg uiojog NI Y Y MS eseej eH Iduna Idi SHAA WOHd33 gt Wr Zy Da XEU v9 NW A 9 WvHa WOU SSIHAAY sna av 09 X 79 Jroi
59. t 40V 10 gt HEAD9 us aaa HEAD7 ie aaa HEAD5 F a HEAD3 Ep 15 2 Line Feed Motor Resistance of each coil should be about 7 60 Signal Connector pin number CN6 LF1 P LF2 1 LF3 gt 3 LF4 P 3 Space Motor Resistance of each coil should be about 50 Signal SP U SP V SP W SPA SPB 5V EL Connector pin number CN2 3 5 SP gt Motor 2 20 10 4 2000 gt Wa 18 oA B DA Vcc DK 6 5 Troubleshooting Flow Chart 1 C Power is not supplied D Yes No e No Is the AC cable connected correctly No e Connect the AC cable correctly Is fuse F1 on the transformer assy or F1 on the control power supply board blown Yes e Replace fuse with same type and rating e Remedied No Yes e End Does DC 8V out Yes e Turn power off remove printhead then turn on e Remedied No Yes e Replace printhead e End s Replace carriage cable or ribbon feed mechanism e Remedied No Yes e End e Replace control Power supply board Remove CN3 on driver board Measure for any short circuits between 5V 40V 8V OV EL or EP Any short circuit Yes No Yes e Replace driver board e Replace transformer assy e Remedied No Yes e End N e Replace control power supply board Driver Board CN2 D ecccccccccce Pin No 20 19
60. t may cause static electricity Do not place the printed circuit board directly on the equipment or on the floor If adjustment is specified in the middle of installation follow the instructions 3 1 3 2 Service Tools Table 3 1 lists the tools necessary for replacing printed circuit boards and parts of units in the field Table 3 1 Service tools No Service Tool Q ty Use Remarks 4 No 1 100 Phillips 4 Screws screwdriver 2 6 mm 2 No 2 200 Phillips 4 Screws screwdriver 3 5 mm 3 No 3 100 4 SE screwdriver 4 oo Spring hook 1 lt Head gap NS S 5 w man p J YX4025 83335 3 1 adjustmeri 6 lt SS Volt ohmmeter 1 Head gap 7 cc Feeler gauge 1 adjustment 8 IE Pliers 1 9 an No 5 nippers 1 10 are bar pressure gauge 3 3 Disassembly Reassembly Procedure This section explains the assembly replacement procedures according to the following disassembly system Parts Layout Printhead Control Power supply board 9 Ze NN Z OA N XN A Vi ut X ANN q A Sy 5 kr es lt 2 lt SEN SS lt A I S SUS AST IS N R gt gt n N SEN Operation panel board l C SX AN Figure 3 1 Printer unit How to Change Parts This section explains how to change parts and assemblies appearing in the disassembly diagram below Printer unit 3 8 1 Printhead 3 3 2 m 3 83 3 Pull up roller assy Ribbon protector
61. the DC motor the carriage frame moves 0 8 inch 20 32 mm At the same time the encoder disk rotates together with the motor and passes through the sensor The position of the carriage frame can be determined by counting the interrupts detected by the sensor In the same way the rotation of the space motor can be recognized and controlled by measuring the cycle of interrupts detected by the sensor Print Head Carriage shaft Space rack er p Carriage frame Encoder disk Encoder sensor Motor gear Adjusting screw Slider Adjusting gear en Guide rail Figure 2 4 Carriage Assy removed 2 2 3 Head Gap Adjusting See Figure 2 5 The head gap adjusting lever moves back and forth to tilt the carriage frame altering the gap between the printhead and the platen The adjusting screw which is connected to the adjusting gear rotates when the adjusting lever is moved creating a fine gap adjustment If the adjusting gear is pushed down the adjusting screw can be turned with a screw driver to change the coarse gap adjustment When the adjusting lever is set to range the contact attached to the under side of the carriage cover will connect with the contact of the space motor PC board The printer will reduce the printing speed automatically to ensure that adequate printing pressure is maintained for multipart paper Moving the adjusting cam toward the left or right adjusts the guide rail up or down Platen
62. ve the ribbon protector see 3 3 2 Remove the pull up roller assy see 3 3 2 Remove the upper cover assy see 3 3 4 Remove the platen assy see 3 3 11 Release claws A Lift up the paper chute assy 1 and remove To install reverse the removal procedure 3 3 20 Rear Tractor Assy 1 Remove the printhead see 3 3 1 Remove the ribbon protector see 3 3 2 Remove the pull up roller assy see 3 3 3 Remove the upper cover see 3 3 4 Remove the reset spring see 3 3 17 3 Remove the tractor gear 1 Shift the drive shaft 2 to the right side to remove in the direction of the arrow To install reverse the removal procedure Note on installation When the tractor assemblies L 3 R 4 have been detached from the drive shaft align the protrusions 5 of the pin tractor wheels in the same direction as before assembly 5 3 3 21 Rear Pressure Assy 1 O Remove the upper cover see 3 3 4 Remove the change lever and gears see 3 3 17 Remove the paper pan see 3 3 19 Remove the rear pressure roller 1 Rotate the release shaft 2 and move it to the left to detach the release shaft 2 Match the main frame rib A with the protrusion B of the release shaft Remove rear pressure SP assy 3 To install follow the removal steps in reverse order Note 1 When installing the release shaft 2 pay attention to the gear engagement of release shaft 2 change arm lever 6
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