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Oki 3321 Printer User Manual

1. les Revers LF from P E Sensor to tractor feed assy Reverse LF until paper end or 19 inches max PARK Alarm LED lights up when P E is not detected after 19 inches reverse feeding Operator can press SEL key to turn off the ALARM LED then press PARK key to continue park function This operation is required when the length of paper for parking is more than 19 inches 3 ASSEMBLY DISASSEMBLY 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 Precaution for Parts Replacement 1 AC receptacle aana N 22 Ll Remove the cable and the interface cable before disassembling assembling a Turn off the AC power switch Remove the AC input plug of the AC cable from the receptacle Remove the AC cable from the inlet on the printer only 200V b To connect the AC cable again connect it to the inlet on the printer only 200V first then insert the AC input plug into a receptacle B AC input plug AC cable Do not disassemble the printer as long as it is operating normally Do not remove unnecessary parts and limit the disassembly area as much as possible Use the designated service tools Carry out disassemb
2. Print Data 1 09 HEAD DRIVE TIMING CHART DT1 Print Head DT2 HEAD _ u DRIVE CURRENT Print Compensation Control The print compensation can be made as 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 left the stroke length up to the platen is different for each pin Pin coil current Pin 1 2 8 9 Pin 3 6 gt Time d Simultaneous Compensation of the number of impact pins The MPU is provided with the compensation table for each pin to make necessary compensation Number of impact pins Few lt 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 5 Print speed 100 95 85 85 80 Drive time lengthens at each step 2 11 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 th
3. Assy Hd eoejdeg uedo jeubis dec peer ud dn siubr1 440 suiooz NO 5 002 yug det p eog Alddns JAMO d O1JUOD Hd 1uug Uonoeuuoo Hd Y42949 SI Suisiueuoeui Y29049 p eog Ajddns jamog Boe doY Hd eoeds eoejdeu ONILOOHSFTANOHL AGH 1095 10 AQ yoys uedo si JejsiuuJeu uonisod jou seop Juud wieje lUud uueje Uld payloads utum peunooo jou S eoeds dOud 0c 2 AV IdSIG 9 qeL Buroeds INaviv ONIOVdS AYOODALVO INaviv 6 4 Operation panel board ee Driver board f AC connector Control Power supply board LF motor Space motor 6 4 Connection Circuit Check for Printhead and SP LF Motor 1 Printhead Signal HEAD1 HEAD2 HEAD4 HEAD6 HEAD8 EL HTEMP 40V 40V 40V HEAD9 HEAD7 HEAD5 HEADS Connector pin number CN1 1 gt 2 gt nm 3 gt 4 gt m n
4. End e Replace Control Power supply board Pin No 20 19 18 17 16 15 14 13 10 9 7 6 Signal 8V Nt Eod EL 45V F G 10V 0V 6 10 No spacing operation The alarm LED Blinks e 15 carriage assembly binding or jammed No Yes e Check around space motor to repair the mechanism of 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 Homing does not end normally Yes No e Check around space motor to repair the mechanism Space rack ribbon feed assembly back up roller carriage frame support protector and ribbon protector e Remedied No Yes e End e Replace Space motor assy lt Replace Space motor assy e Remedied No Yes e End Replace Carriage cable e No Yes e End Replace Driver board e Remedied No Yes e End Replace Control Power supply board 6 12 5 Paper while paper insertion Jam 1 Check the ribbon protector Check the pull up roller cover is closed Pull up roller cover Platen Paper Ribon Protector Jam 2 wrinkled paper Check around pressure roller mechanism Front pressure springs are narrow pcs wide 5 pcs mounted properl
5. Jo evod gt os NP I e dS Kee NP Ojo ds HOSN3S 3d AAS oseopu E M Jopoou3 dec JANI E WIEN OH pad gt ZOU SOT d WOU433 Er v Wh At 5 2i renle pi xeu ESCH SS Ce do vod WOY Sz pues IS1 MEME 09x19 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 0 17 DO D15 PG N CSO 9 ICE PSEN Q OE MPU CLOCK A0 A17 x x x PG N PSEN N um _ xr Tum Program Program Program 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 the examples of the memory access operation MPU RAM 1 Q3 7 2 Q4 D O RAS CS1 D CAS DO D3 D4 D7 RD o Clockout T1 T2 T
6. LF Motor Phase Initialization Serial Parallel IF 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 level 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 request stopping of data transmission gt BUSY gt ACK N MPU LSI Receive Data NBSY gt bus lt ACK D NSTB RXD P16 lt NRXD Data 1108 STROBE 500ns max 5 BUSY M lt 2 8us RXD STB N 2 1 5 Print Control Print data is transmitted as parallel data HEAD1 HEADS9 from LSI to print head LSI generates print timing and drive time Control Power Supply Board Driver Board MPU DAT LSI A D bus DRIVER Print Data HEAD1 N HEAD9 N
7. NN ADR bus NN NN Serial data 5 VD 9 V control line 10 VAC 9 V power supply circuit 9 V Bus line 5 V AEN C Control line OV Figure C 2 1 Block Diagram 2 2 1 2 2 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 Ready Busy Received one character No Is DSR valid Yes No Buffer overflow Yes Yes No No Error Parity error No error Store the received character in buffer Store 40 H in 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 re
8. Continuous sheet form Pull Tractor assembly Drive gear Idle gear LF motor Platen Platen gear LF Idle gear Figure 2 12 Bottom push feed operation Option See Figure 2 13 The bottom push feed of the continuous sheet is possible only when the bottom tractor feed unit is installed When the platen rotates the rotational force of the platen is transmitted through the tractor idle gear and the tractor change gear to the tractor drive gear of the bottom push tractor and the sheet of paper is fed in to the print start position Platen gear Change gear Idle gear Tractor change gear Tractor idle gear 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 And at the same time the position of the cam installed to the front release gear shaft changes and the open and close of the pressure roller Position of Open or close of Open or close of change lever front pressure roller rear pressure roller BOTTOM TOP REAR TOP BOTTOM REAR Change lever Release cam Platen Front release gear arm 2 2 6 Paper Detection Mechanism See Figure 2 15 1 Cut sheet detection When the cut sheet is inserted th
9. Table 6 1 Trouble Contents Troubleshooting Flowchart No Surmise of Trouble Trouble upon power on Power is not supplied Homing does not end normally Control Power Supply Board Driver Board Transformer Assy Space Motor Carriage Cable Printhead Space Motor Carriage Cable Control Power Supply Board Driver Board Spacing Mechanism Trouble during printing Paper jam while paper insertion Malfunction of switch on operation panel Data receiving failure Pressure Roller Mechanism Pull Up Roller Cover Printhead Driver Board Space Motor Carriage Cable Printhead Ribbon Feed Assembly Driver Board Ribbon Feed Assembly Space Motor Driver Board LF Motor Platen Assy LF Mechanism Driver Board Driver Board I F Board I F Cable Menu Setting 6 3 Lamp Display 1 ALARM CATEGORY Printer mode display ALARM Table 6 2 LED CONDITION SEL MENU 10CPI CONTENTS TROUBLE 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 Mec
10. eui ees UBD uonNensnijl SU uoJ4 3 0N om 4 UOISSIUISUEJ 9J uononuisu uoneonnou 10113 DN 40 YO 10 yoayo suods y 2 16 10 5871214 EIER 1 ye a JO Fg Fg G RI TT ep 10 51 UE Er zd N H I0dO pod o lt GON 11 Il tt N Ee puooes esuodsei y x Daul esuodsei x i Li X 9 19591 r M HIN 157 40 zug D EM La 1 1 i M1940 NO N P 1 1 1 1 1 1 1 ri puooes N A 1S4 X 1 ie e 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
11. 2 3 4 5 6 Remove the printhead see 3 3 1 Remove the upper cover see 3 3 4 1 5 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 from the space motor To install follow the removal steps in the reverse order Notes on installation 1 Do not touch the terminals of space motor Also take care to avoid dust or foreign matters When installing the guide roller Assy push portions A and B against the space motor When installing the space motor align the face with carriage frame 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 Remove the printhead see 3 3 1 Remove the upper cover see 3 3 4 1 5 Remove the gear case Assy see 3 3 5 Remove the space motor see 3 3 7 Remove the spring Disengage the claw on left side of space rack from the frame and remove the space rack in upper direction To install follow the removal steps in the reverse order Note on installation 1 After installation check and adjust the gap between platen and printhead see 4 1 3 12 3 3 9 Carriage Cable Remove the printhead see 3 3 1 Remove the upper cover see 3 3 4 1 5 Remove the gear case Assy see 3 3 5 Remove the space motor see 3 3 7
12. 4PA4044 5041G2 Tractor frame assy R 1 2 33 4PA4044 5043G2 Tractor frame assy L 1 2 34 4PP4025 3335P3 Drive shaft 1 2 For ML3320 4PP4025 3335P4 Drive shaft 1 2 For ML3321 35 3PP4044 5046P1 Tractor sheet guide 1 2 For ML3321 36 4PB4044 5095P1 FG plate A Figure 11 4 Carriage Assy Figure 11 4 Carriage Option Assy No Part No Description Q ty d Remarks 1 4PP4044 5061G1 Carriage frame set 1 2 2 3 4PA4025 3718G1 Back up roller holder assy 1 2 4 4PP4025 3398P1 Guide roller d 2 5 3PP4044 5065P1 Guide roller holder 1 2 6 4YA4044 5100G1 Space motor assy 1 4 7 3PB4044 5506P1 Head cable 9N 1 5 For ML3320 3PB4044 5507P1 Head cable 9W 1 5 For ML3321 8 3PB4044 5125P1 15 pin connector 1 2 9 3PA4044 5070G1 Gear cace assy 1 3 10 3PP4044 5068P1 Head clamp 1 1 11 4PP4044 5067P1 Head plate 1 1 12 3PP4044 5064P1 Ribbon protector 1 2 13 4PP4025 3397P1 Back up roller holder spring 1 1 14 4PP4044 5066P1 Guide roller spring 1 1 B 10 Pull Tractor Bottom Tractor Board Figure 11 5 Option Spare Parts B 11 Figure 11 5 Option Spare Parts We Q ty No Part No Description Q ty Required Remarks 1 4PA4025 3608G1 Pull and bottom 1 2 tractor assy L 2 4PA4025 3603G1 Pull and bottom 1 2 tractor assy R 3 2PP4128 1239G1 Tractor cover assy N 1 3 For ML3320 2PP4128 1243G1 Tractor cover assy W 1 3 For ML3321 4 1PA4128 1277
13. 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 4 3 3 1 Printhead 3 3 2 m 3 3 3 Pull up roller assy Ribbon protector 3 3 4 Upper cover access cover and sheet guide m 3 3 5 Gear case assy m 3 3 6 connector E 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 3 3 11 Platen assy _ 3 3 19 Paper pan m 3 3 12 Driver board SDDV L 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 3 317 Change lever and gears 3 3 20 Rear tractor assy L 3 3 21 Rear pressure assy 3 3 22 Switch lever 3 3 1 Printhead 1 Open the access over 2 Pull up and rotate the head clamp to unclamp the printhead as shown fig 3 3 1 3 Disconnect the printhead from PC connector 4 install follow the removal steps in the reverse order Notes on installation 1 Insert the printhead into the PC connector while pushing it against the carriage frame 2 head clamp must surely be sandwiched between printhead 2 and carriage frame 0 as shown fig 3 3 2 Be sure to check the gap between platen and printhead
14. 6 5 gt 8 6 gt 7 Thermistor gt 51 8 gt 9 gt 10 11 m n 9 12 S rv 13 14 i man E3 15 THT 2 Line Feed Motor Resistance of each coil should be about 7 60 Signal Connector pin number CN6 LF1 P LF2 LF3 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 Motor a 20 10 2002 gt Wie 18 oA eB DA Vcc DK 6 5 Troubleshooting flow chart _Power is not supplied Yes No e No lt 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 Remove Printhead Turn power off then on e Remedied No Yes e End e Replace carriage cable or ribbon feed mechanism e Remedied No Yes e End e Replace Control Power supply board Remove 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 Remedied BS Driver Board No Yes CN2 2 20
15. Make sure that the power is turned off at the time of measure ment Specification Drawing Engagement of the double gear and the LF motor idle gear of the Platen Assy LF Motor Platen gear L idle gear Bias gear L E Good Not good Tension Locked M Adjustment method To confirm 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 teeth as shown in the drawing 5 CLEANING AND LUBRICATION 5 1 CLEANING AND LUBRICATION Cleaning Cautions 1 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 portion after cleaning 1 Cleaning time When the equipment operating time has reached six months or 300 hours 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 the vicinity Paper travel
16. Remove the space rack 3 3 8 Remove two screws release the driver board and PCB sheet by lifting clamp and disconnect cable from connector Remove carriage cable from fasteners on frame To install follow the removal steps in the reverse order on installation Take care not to fold the carriage cable during installation Curve slightly the carriage cable when assembling into the fasteners Make sure that the paper end lever will not contact the Paper end Sensor when mounting the Driver Board 3 13 3 3 10 Backup Roller Holder Assy 1 Remove the printhead see 3 3 1 Remove the upper cover see 3 3 4 1 5 Remove the gear case Assy see 3 3 5 Remove the space motor see 3 3 7 Remove the backup roller spring Disengage claws 2 places of roller holder from the carriage frame and remove the backup roller holder assy To install follow the removal steps in the reverse order J Claw 2 places ir Ka Note Small round hole with metal tip on back up roller holder assy should be facing up when installing 3 14 3 3 11 Platen Assy 1 CA A YH 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 1 1 5 Turn the change lever to the bottom position Push in the lock levers
17. 01236 727777 Fax 01236 451972 OKI People to People Technology Oki Data Corporation 4 11 22 Shibaura Minato ku Tokyo 108 Japan Tel 03 5445 6162 Fax 03 5445 6189 M 521368 1A 4 96 Printed in Japan
18. 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 Confirm followings 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 tractor Backlash between gears Specification Drawing Change lever Center friction Push tractor Tractor gear Slight backlash Approx 0 05 to 0 11 mm Adjustment method To confirm The tractor gear shall rotate smoothly when the change lever is set at Friction posi tion To confirm There shall be slight backlash between gears to allow smooth rotation of gears Backlash 0 05 to 0 11 mm Ribbon feed Running load to spac ing mechanism Specification 250g or less without a rib bon cartridge Drawing Ribbon feeding Ribbon cartridge Ribbon Load measurement portion Adjustment method To confirm Ribbon shall be fed smoothly when the carriage is moved from side to side To confirm
19. 3PP4044 5360G1 Operation panel 1 2 6 3YS4011 1315P1 AC cord 1 1 For ODA 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 8 4YB4042 1553P1 Fuse 237002 1 10 For 120V 125V 2A 4YB4042 1552P1 Fuse 217001 1 10 For 230 240V 250V 1A 9 4YB4049 7103P1 Transformer assy 1 2 ML320 Turbo 120V 4YB4049 7104P1 Transformer assy 1 2 ML320 Turbo 230 240V 4YB4049 7103P2 Transformer assy 1 2 ML321 Turbo 120V 4YB4049 7104P2 Transformer assy 1 2 ML321 Turbo 230 240V 10 3PB4050 3429P2 PCB plate 1 2 For 230V ODA OEL Figure 11 3 Printer Unit Figure 11 3 Printer Unit me Q ty No Part No Description Q ty Required Remarks 1 3PA4044 5002G2 Main chassis assy N 1 2 For ML3320 3PA4044 5152G2 Main chassis assy W 1 2 For ML3321 2 4044 5012 1 Bottom paper end lever 1 1 3 4PP4044 5019P2 Pressure spring F 3 2 For ML3320 4PP4044 5019P1 Pressure spring F 5 4 For ML3321 4 4PP4044 5031P2 Roller holder F 3 6 For ML3320 5 8 For ML3321 5 4PA4025 3327G1 Front pressure roller 3 6 For ML3320 5 8 For ML3321 6 3PP4044 5015P1 Release shaft N 1 2 For ML3320 3PP4044 5157P1 Release shaft W 1 2 For ML3321 7 1PP4044 5021P1 Paper pan plate N 1 2 For ML3320 1PP4044 5158P1 Paper pan plate W 1 2 For ML3321 8 3PP4025 3320P2 Leaf spring N 1 2 For ML3320 3PP4025 3507P2 Leaf spring W 1 2 For ML3321 9 3PP404
20. 4 1 uo NVH pueog 4 1 40419 WVH INHv Tv 3OVJ3H2 LNI Vidas peog Alddns U09 JO WOH dn 01 peioelep si 4444 wieje p eog Alddns 10 NO pue 440 y uin dey SI 30 Hod INN INN p eog Alddns samog N104U09 10 NO pue 440 Jamod y SulG9 Joe 19501 501 pue dn 5 Nd uueje yM LAM NOILOALAG JHvMImNHI4 p eog Alddns spea p eog Alddns 40419 wieje p eog lddns U02 10 NOH eoejdeu 40119 WNS YOSYD 0 p eog Alddns ONILLOOHSFTANOHL 40419 02 st 9 eiqer AV IdSIG 031 INaviv OHLINOO NIVIN AdODALVD Nav iv 6 3 p eog Alddns
21. from the operation panel 5 install follow the removal steps in the reverse order 3 18 3 3 15 Control Power Supply Board SDCT 1 2 3 4 5 Remove the upper cover see 3 3 4 1 5 Disconnect two flexible cable from the connector the Control Power Supply Board Remove the cable from the connector the Control Power Supply board Remove two screws and remove the Control Power Supply Board To install follow the removal steps in the reverse order Remark on assembly 1 To mount the Control Power Supply Board set the change lever to the top position so that the Switch Lever will not hooked on the microswitches 3 19 3 3 16 Transformer Assy Remove the upper cover see 3 3 4 1 5 Remove inlet and AC switch from the frame guide 3 Disconnect the cable from the connector on the Control Power Supply Board Remove a screw and disconnect ground cable Remove two screws and shift the transformer Assy to the left and remove it 3 3 17 Change Lever and Gears 1 Remove the upper cover see 3 3 4 1 5 2 Remove the reset spring then remove the idle gear the tractor gear and the change gear 3 Push back the protrusion of the Change Gear Shaft with a flatblade screw driver to remove the change lever 4 To perform mounting follow the reverse procedure of removal Remar
22. on both sides to unlock from the frame then rotate them upward by 90 Remove the platen Assy from base frame To install follow the removal steps in the reverse order FA 9 N 2 BIN 3 15 3 3 12 Driver Board SDDV 1 Remove the upper cover see 3 3 4 1 5 2 Remove two screws and release the driver board and PCB sheet by lifting clamp 3 Disconnect all cables from driver board 4 To install follow the removal steps in the reverse order Note on installation 1 Insert one sensor lever between sensor when installing the driver board 3 3 13 LF Motor 1 Remove the printhead see 3 3 1 2 Remove the ribbon protector see 3 3 2 3 Remove the pull up roller Assy see 3 3 3 4 Remove the upper cover see 3 3 4 1 5 5 Remove the platen Assy see 3 3 11 6 Remove the driver board see 3 3 12 7 Remove the left FG plate 8 Release the lock A to remove the LF motor 9 install follow the removal steps in the reverse order Remark on assembly 1 Press the LF Motor Cable with a portion of the Motor Plate 3 17 3 3 14 Operation Panel PCB LEOP 1 Remove the upper cover see 3 3 4 1 5 2 Disconnect the cable from connector of Driver board 3 Disengage claws on both sides from the frame and remove the operation panel 4 4 Open claws 8 places and remove the operation panel PCB
23. or change gear broken No Yes e Replace the gear e Set change lever to the rear position e Does the platen rotate smoothly No Yes e Replace Tractor feed assembly e Replace LF motor assembly Replace LF motor assembly e Remedied No Yes e End Replace Driver board 6 17 9 Malfunction of switch on operation panel e 15 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 Data receiving failure e ls the SEL LED blinking No Yes e Printer went into the print suppress mode Wait until printer to receives DC1 code or change the menu item Print suppress Ineffective when the function is not required e Is the I F RS232C No Yes e To step e Does the SEL LED light up Yes No e Press SEL key e Remedied No Yes e Does the printer receive data properly No Yes e To step e End e 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 Replace Driver board e Remedied No Yes e End e Replace I F cable 6 19 102 RS232C I F Printer pin assignment Yes Y 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 ALARM LED blinking Yes e See tables 6 2 and 6 3 for the tro
24. prevent blurring of print image 5 Pin tractor To prevent stained paper 6 Flexible cable To prevent loose connection and crack 7 Motor PCB To prevent loose connection 8 Connector terminals To prevent loose connection 5 Lubrication point 1 Ribbon feed gear Assy Drive gear shaft upper and lower 0 006 0 0029 Planetary gear shaft upper and lower Idle gear shaft upper and lower 0 006 0 0029 2 Space rack Space rack Approx 30 greasing range Rack upper side Approx 35 greasing range 30 gt 3 Platen Assy Contact face of platen shaft and platen FG spring EM 30 L B Bias gear Grease the contact face of platen gear L and bias gear PM B Platen gear L 4 Tractor driving mechanism Change lever Sliding surface of change arm and change lever EM 30L A Tractor gear bearing portion EM 30L A Change arm Idle gear teeth EM 30L A Reset spring Gear bearing portion PE 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 portion of release shaft and change arm EM 30L A Release shaft Contact portion of support spring and shaft EM 30L A Contact portion
25. same trouble occurs again If not perform the printers self test and thoroughly test the printers 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 data is not received using a serial interface A protocol is set to READY BUSY state and BUSY LINE is in SSD state Is the OSC oscillation waveform as specified in Figure C 3 1 90 5 p ee 410 5 0to 1V Figure C 3 1 e No Replace the OSC L 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 Y Yes Are ALE PSEN RD WR signals as specified in Figure C 3 3 542ns mos A 5V ALE DN 5V PSEN L ov PSEN 271ns 542ns RD WR I 5 ov Figure C 3 3 e No Replace the Q3 Yes Are T1 SELECT and INTO BUSY signals low level e Check Q501 on the SDDV board Yes Are 9V and 9V input to Q1 e No Replace defective component in 9 9 volt 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 Yes Is the RxD of Q3 as specif
26. see 4 4 Be careful not to touch the print head while it is very hot Figure 3 3 1 Figure 3 3 2 SCH 3 3 2 Ribbon Protector Remove the printhead see 3 3 1 ch Open the pull up roller cover Raise and remove the ribbon protector N 3 To install follow the removal steps in the reverse order 3 3 3 Pull up Roller Assy 1 2 3 4 Open the access cover Lift up the sheet guide Assy to remove Tilting the pull up roller Assy toward the front remove from the shaft of platen Assy To install follow the removal steps in the reverse order Note Remove the sheet guide Assy before installing or removing the pull up roller Assy 3 3 4 Upper Cover Assy Access Cover Assy and Sheet Guide Assy 1 2 3 4 8 Pull off the platen knob Turn the change lever toward the bottom position Insert a flat blade screwdriver into grooves 5 places 4 places for narrow type of frame and twist to disengage claws of upper cover Raise the front side of upper cover Assy and shift toward the rear to disengage claws 6 places 5 places for narrow type of frame Raise the upper cover Assy to remove Open the access cover Assy toward the front to remove Lift up the sheet guide Assy to remove To install follow the removal steps in the reverse order Remark on assembly Match the posts at the both sides of th
27. supply Assy N Bottom switch Switch lever Change gear shaft Rear switch ER Change lever SQ Ze Release shaft uo BOTTOM Change lever 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 position the cut sheet is automatically fed in up to the print start position after pausing for the wait time stored in the menu Stepping motor LF motor Pressure roller Platen Platen gear LF Idel gear Figure 2 9 3 Continuous paper feed operation Rear See Figure 2 10 The force transmitted to the platen rotates the tractor gear through platen gear the idler gear and the change gear The rotation of the tractor gear makes the pin tractor belt rotate through a sheet feeder shaft feeding the continuous paper Q Q 9 Q N S K N 7 5 9 Platen gear 9 Tractor gear S E NS Paper Idle gear Change gear Fi
28. 3 7 CS1 CS4 RD DO D7 Read WRH WRL DO D7 Write X X 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 1 024 bits The EEPROM contains menu data The following shows the memory access operation MPU EEPROM EEDIN P P24 gt Di EECS P P27 gt CS EEDOUT P P25 DO EECLK P P26 gt SK PRE O X d EECS P le CS EECLK P Operation Start Code Address code 1 1 1 EEDIN P P Cac 5 0 EEDOUT P d E D15 DO 015 DO 015 Read cycle timing READ PRE PE 2 t EECS P gt lt Start Operation Address Data code code 5 EEDIN P NO 015 X DO EEDOUT P Ready 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 connecte
29. 4 5011P1 Paper end lever 1 1 10 3PP4044 5013P1 Sensor lever 1 1 11 4PP4025 3340P1 Change gear 1 2 12 3PP4025 3341P1 Tractor gear 1 2 13 4PP4044 5020P1 Pressure spring R 3 2 For ML3320 3 2 For ML3321 14 4PP4044 5163P1 Pressure spring W 2 1 For ML3321 15 3PP4044 5033P1 Roller holder R 3 6 For ML3320 5 10 For ML3321 16 4PP4044 5017P1 Change arm lever 1 2 17 SPP4044 5014P1 Switch lever 1 1 18 4PP4044 5024P1 Idle gear PLT 1 2 19 2PP4044 5016P1 Change lever 1 2 20 3PP4044 5023P1 Reset spring D 1 2 21 3PA4044 5110G1 LF motor assy 1 4 22 3PP4044 5034P1 Rear pressure roller N 1 2 For ML3320 4044 5162 1 Rear pressure roller W 1 2 For ML3321 Q ty No Part No Description Q ty Required Remarks 23 3PA4044 5025G2 Platen assy N 1 3 For ML3320 3PA4044 5159G2 Platen assy W 1 3 For ML3321 24 3PP4044 5010P1 Space rack gear N 1 3 For ML3320 3PP4044 5156P1 Space rack gear W 1 3 For ML3321 25 4PB4025 3377P2 Tension spring for space 1 1 rack 26 3PP4044 5008P1 Guide rail plate N 1 1 For ML3320 3PP4044 5155P1 Guide rail plate W 1 1 For ML3321 27 3PP4025 2810P2 Adjust cam 1 1 28 4PP4044 5009P1 Carriage shaft 1 1 For ML3320 4PP4044 5009P2 Carriage shaft 1 1 For ML3321 29 3PP4044 5005P1 FG plate L 1 1 30 3PA4044 5050G1 Pull up roller assy N 1 2 For ML3320 3PA4044 5165G1 Pull up roller assy W 2 For ML3321 31 4PP4044 5115P1 Idle gear 9 1 4 32
30. G1 Bottom push stand L 1 2 5 1PA4128 1277G2 Bottom push stand R 1 2 6 4PP4094 7385G1 Paper knife N 1 1 For ML3320 4PP4094 7386G1 Paper knife W 1 1 For ML3321 7 4YA4021 1050G1 LXHI PCB RS232 I F 1 3 B 12 APPENDIX C RS 232C Serial Interface Board Option 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 5 80 51 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 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 Receiver N R data bus N NN
31. OKI MICROLINE 3320 3321 PRINTER Maintenance Manual All specifications are subject to change without notice PREFACE This maintenance manual describes how to maintain the Microline 3320 3321 printer in the field This manual is for customer engineers For further information refer to the Users Manual for handling or operating the equipment TABLE OF CONTENTS CONFIGURATION 1 1 Standard Printer Configuration 1 2 Options THEORY OF OPERATION 2 1 Electrical Operation 2 1 1 2 1 2 2 1 3 2 1 4 2 1 5 2 1 6 2 1 7 2 1 8 2 1 9 Summary Microprocessor and the Peripheral Circuit Initialization Parallel Interface Control Print Control SP LF Motor Control Operation Panel Alarm Circuit Power Supply Circuit 2 2 Mechanical Operation 221 Printhead Mechanism and Operation 2 2 2 Spacing Operation 2 23 Head Gap Adjusting 2 2 4 Ribbon Drive 2 2 5 Paper Feed Operation 2 2 6 Paper Detection Mechanism 2 2 7 Automatic Sheet Feed 2 2 8 Paper Park Function ASSEMBLY DISASSEMBLY 3 1 Precautions for Parts Replacement 3 2 Service Tools 3 3 Disassembly Reassembly Procedure 3 3 1 3 3 2 3 3 3 3 3 4 3 3 5 3 3 6 3 3 7 3 3 8 Printhead Ribbon Protector Pull up Roller Assy Upper Cover Assy Access Cover Assy and Sheet Guide Assy Gear Case Assy PC Connector Space Motor Guide Roller Assy Space Rack 3 3 9 Carriage Cable 3 3 10 Backup Roller Holder Assy 3 3 11 Platen Assy 3 3 12 Driver Boar
32. OTTOM TOP GN N BOTTOM REAR ru Figure 2 17 2 When using the continouos paper 1 Sm SECEE GJ Set the change lever either to the rear side or the bottom side position See Figure 2 17 Set a sheet of paper either to the push tractor or the bottom tractor Press the FF LOAD switch The LF motor starts its operation to feed the paper up to the print start position The paper is fed in up to the TOF position Factory default 0 35 inches from the top Push down the FF LOAD switch x y Detection of the sheet supplied Line feed about 3 inches until the detection of the sheet supplied When the FF LOAD switch is pushed down the LF motor feeds in the sheet about 3 inches When the LF motor completes the operation and the sheet has not been fed in the feeding operating operation becomes ineffective thus resulting in the feeding jam 2 2 8 Paper Park Function Continuous paper Continuous sheets which have been inserted can be reversed automatically by using the PARK button on the operation panel 1 Press the PARK button on the operation panel 2 Reverse LF is started and paper is fed in reverse until paper end occurs or 19 inches maximum have been fed 3 The paper is fed in reverse to leave the paper on the push tractor or bottom tractor Paper end detection V 5 NN LF action
33. be specified directly 2 18 2 1 9 Power Supply Circuit This power supply circuit supplies the 5VDC 8VDC 40VDC 10VAC Control Board sw Noi d 23 e o evox We gt gt Rectifier gt 440V Fuse circuit Trans former o Rectifier M 48V Regulation 45V Circuit gt 1 The uses of output voltages signals are described below Voltage signal Use 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 pin driving head using a permanent magnet It is attached to the carriage which moves in parallel with the platen Electrically this unit is connected to the control circuits through the control board 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 d e e Wire guide Spring assembly Wire Armature Spring Yoke Spacer Magnet assembly Magnet core coil Yoke Printed circuit board Fin 2 Operation of printhead See Figure 2 3 a b When the printhead is idle the armature is attracted by a permanent magnet and
34. chanism 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 in parallel with 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 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 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 shaft Space Carriage frame Encoder disk Encoder sensor Slider Se Guide rail Figure 2 4 2 2 3 Head Gap Adjusting See Figure 2 5 The head gap adjusting lever moves back and forth t
35. ctor Assy L have been detached from the Drive Shaft align the protrusions of the Pin Tractor Wheels to the same direction before assembly 3 3 21 Rear Pressure Assy 1 Remove the upper cover see 3 3 4 1 5 Remove the change lever and gears see 3 3 17 Remove the paper pan see 3 3 19 Remove the rear pressure roller Rotate the release shaft 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 To install follow the removal step in the reverse order Note 1 2 At mounting release shaft pay attention to the gear engagement of release shaft change arm lever change gear shaft There are 5 Rear pressure Spring Assemblies Use two pieces which have larger spring diameter on the right side Use three remaining pieces on the left side for ML3321 Make sure that the Release Shaft will be on top of the Support spring To assemble the Release Shaft gt make sure that the protrusion of the switch lever is in the U groove of the Release Shaft 3 3 22 Switch Lever 1 Remove the upper cover see 3 3 4 1 5 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 f
36. cuits 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 67 640 This processor is a CMOS 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 1 2 4 PSIA 2 Pra AND 15584 INS 5 AD SCH Mp
37. d SDDV 3 3 13 LF Motor 3 3 14 Operation Panel PCB LEOP 3 3 15 Control Power Supply Board SDCT 3 3 16 Transformer Assy 3 3 17 Change Lever and Gears 3 3 18 Carriage Shaft 3 3 19 Paper Pan 3 3 20 Rear Tractor Assy 3 3 21 Rear Pressure Assy 3 3 22 Switch Lever 4 ADJUSTMENT 5 CLEANING AND LUBRICATION 5 1 Cleaning 5 2 Lubrication 6 TROUBLESHOOTING AND REPAIR 6 1 Items to Check Before Repair 6 2 Troubleshooting Table 6 3 Lamp Display 64 Connection Circuit Check for Printhead and SP LF Motor 6 5 Troubleshooting Flow Chart APPENDIX A PCB LAYOUT B SPARE PARTS LIST C RS 232C Serial Interface Board OPTION 1 CONFIGURATION 1 CONFIGURATION 1 1 Standard Printer Configuration This printer consists of the following assemblies Sheet guide assy 7 Platen knob E p t Access cover assy Operation panel assy Main chassis assy Figure 1 1 Configuration 1 2 Options 1 Cut sheet feeder unit CSF Narrow and wide versions available Dual bin CSF Single bin CSF 2 Pull tractor assy 3 Bottom push tractor unit 5 Serial I F RS232C RS422A Current Loop 2 THEORY OF OPERATION THEORY OF OPERATION Electrical Operation The electrical operation of the printer circuit is described in this section Summary Fig 2 1 shows the block diagram of the printer The control board is made up of the microprocessors peripheral circuits drive cir
38. d in multiplex to the MPU MPU LSI A D bus 5 gt P07 ALE RD RDN WRL P WRL 1 LSIC Clockout 19 x x LSICS ALE Date Read i NE RENE DO D15 X Write Address Data WRL Clockout is provided when the original excitation is selected 2 1 3 Initialization 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 LSls When resetting ends the program starts and the LSIs are reset by MPU LSIRST N Reset operation by I PRIME starts program to initialize but does not reset the MPU The program here 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 PUE ACK P signal sending and 5 BUSY N signal off and lights the SELECT lamp to inform the ready state for receiving to the host side and ends the initialize operation a 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
39. d pen Adjust lever Adjust gear Adjust screw Adjust cam Specification Drawing Adjustment method Note 1 The head gap shall be measured with the change lever set to rear position Adjust lever 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 922222772722272222 1 22222222 Click of platen gear R Print head Adjust lever Adjust gear Platen Adjust cam Measure variation of Gap 0 71 gap when range is 0 05 at the changed range 5 Gap between the con tact and the monitor Specification 0 3mm or more Drawing Adjust lever Contact Touching Motor PCB Adjustment method Confirm followings 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 becomes reduced speed mode when the adjust lever is set to range 2 and 4 Specification Drawing Gap between the platen and the paper pan Change lever Ka Rear Platen Friction position SUR Rear Bottom position Change lever B Center friction ottom Gap between the platen and the pressure roller ee H 2 Platen Front pressure roller Pressure roller Adjustment method Confirm followings
40. e Sheet Guide with the arrow marks on the upper cover Push the Guide into the Cover 3 3 5 Gear Case Assy 1 2 3 Remove the printhead see 3 31 Remove the upper cover see 3 3 4 1 5 Move the carriage Assy to right hand side remove two screws then the space motor Disconnect a carriage cable Disengage claws 4 places Using a flat blade screwdriver push to widen the claw for easy disengagement Remove the gear case Assy in upper direction and release the carriage cable from the cable clamp of the gear case Assy To install follow the removal steps in the reverse order Note on installation 1 2 To assemble align the direction of the SP motor axis 4 with the Gear of the Gear Case assy Be sure to check and adjust if necessary the gap between platen and printhead see 4 1 3 3 6 PC Connector 1 Remove the printhead see 3 3 1 2 Remove the upper cover see 3 3 4 1 5 3 Remove the gear case Assy see 3 3 5 4 Remove the PC connector from the space motor Assy 5 install follow the removal steps in the reverse order Note on installation 1 Do not touch the space motor or terminals of PC connector Also take care to avoid dust or foreign matters 2 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
41. e output 8A 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 accelerated or decelerated to maintain the specified speed for each print mode SPU SPV ees SPW SP truth 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 c PHASE B m 1 720 A N UTILITY MODE IPT 10 CPI re 1 120 IPT 12 CPI Le 1 144 15 CPI re 1 180 a IPT 17 CPI I 1 206 EN IPT 20 CPI lt 1 240 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 change
42. e point A is pushed backward and the paper near end lever B rotates counter clockwise CCW At this time the rear sensor lever rotates counterclockwise CCW the rear sensor lever 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 made in the reverse order that is its detection is performed 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 made in the reverse order that is its detection is performed when the rear sensor lever intercepts 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 provided The procedure for the paper end is made in the reverse order that is its detection is performed when the bottom sensor lever intercepts the sensor Paper end sensor Sensor lever Shaded portion Paper end lever Bottom paper end lever Figure 2 15 Top line print mechanism See Figure 2 16 The front edge of the sheet is protected by t
43. gure 2 10 4 Push and pull tractor mechanism Option See Figure 2 11 This mechanism consist of an optional pull tractor and a standard push tractor mechanism This mechanism can perform forward and reverse feed by setting continuous sheets to the push tractor and pull tractor The rotation of the platen is transmitted to the push tractor and the pull tractor Sheets are fed by these two tractors at the same time To remove slack from the sheets set the sheets according to the following procedure when using the push and pull tractors the change lever to the REAR position setting the sheets to the push tractor to feed Set the paper which is fed in front of the platen to the pull tractor Set the change lever to the TOP position and feed paper using the platen knob If paper slack is removed set the change lever to the HEART position Pull tractor 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 an 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 platen The rotation of the idle gear is transmitted to the drive gear and continuous sheet forms are fed by the pull tractor being rotated through the sheet feeder shaft
44. hanism Press SEL key Print Head thermal alarm Print head temperature exceeds 119 C Wait until it is cooled Replace 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 See Table 6 3 Hardware Alarm has occurred See Table 6 3 Note BLINK1 400ms 400ms OFF BLINK2 200ms 200ms OFF LED is kept in Current Condition no change 2 Fault alram 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 Iesel LL NLQ SSD SEL LF FF LOAD TEAR PARK PUT SHIFT Micro Feed Micro Feed TOF Down Up CHARACTER PITCH 10 12 15 EXIT GROUP ITEM SET PRINT Pn SEN POWER ALARM MENU RESET 17 2 ao Figure 6 1 pjeog OUD 4 1 440 SWOOZ 4 eues UJOJJ ON dn sun xullg q31 jou 5 1 pueog 4 peog 5 1 10 pJeoq WOH 40419 40119 WNS YOSYD
45. he ribbon protector so that it can stop at a position just near to the print head 0 tear off position to start printing at the front end of the sheet without causing the sheet to crumple or curl up The printing starts at the front end of the sheet and continues uni directionally until the front end of the sheet gets to the inside of the pull up roller cover After that 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 is used Operational procedure 1 When using the cut sheet 1 Set the change lever to the position See Figure 2 17 2 Insert a sheet of paper between the platen and the paper shoot 3 After the lapse of time selected by the wait time in the menu the LF motor starts its operation to feed the sheet of paper up to the print position 4 When the default is selected the sheet of paper is feed up to the position 0 35 inches first dot position from the upper end of the sheet However the 0 tear off mechanism allows the printing at the front end of the sheet by changing the TOF position Sheet setting q Time out V gt Time selected on the menu LF action ERN Detection timer Swi REAR B
46. ied in Figure C 3 4 d Sr RxD d i ST bit SP bit 5V SSD 55 ov Figure C 3 4 e No Replace the Q2 Yes Replace the Q3 In receiving by serial interface printing data is omitted or printing operation is not performed Are RxD and SSD of Q3 as specified in Figure C 3 4 e No Replace the Q2 Yes Are WR and BUS signals of Q3 pin 3 as specified in Figure C 3 5 542ns WR 3 5V ov 033 1 Mn ov Figure C 3 5 e No Replace the Q3 Yes Is the level of a BUS signals at Q7 pins 2 9 the same as that of DBO 7 when WR signal is started e No Replace the Q7 Yes Is 4 pin of Q6 identical to WR signal in Figure C 3 5 e No Replace the Q6 Yes Check Q501 in the SDDV PCB 10 3 3 Local Test 3 3 1 Circuit test mode 3 3 1 1 Setting 1 Diagnostic test set by menu 2 Test connector Connect the test connector shown in Figure C 3 6 to the interface connector TD RD RTS Equivalent to Cannon DB 25P CTS CD SSD 55 DTR DSR AJIO N ech Figure C 3 6 Test Connector Connection Diagram 3 3 1 2Function After the settings outlined 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 switch on the front of the printer Details of this tes
47. k on assembly 1 To insert the change lever into the Change Gear Shaft match the flat surface D cut 3 3 18 Carriage Shaft 1 2 3 4 5 Note on installation 1 Remove the printhead see 3 3 1 Remove the upper cover see 3 3 4 1 5 Remove the driver board see 3 3 12 Remove the FG plate L Slide the carriage shaft to the left side in the direction of the arrow to remove To perform mounting follow the reverse procedure of removal 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 2 Remove the ribbon protector see 3 3 2 3 Remove the pull up roller assy see 3 3 2 4 Remove the upper cover assy see 3 3 4 1 5 5 Remove the platen assy see 3 3 11 6 Release claws 7 Lift up the paper chute assy and remove 8 To perform mounting follow the reverse procedure of removal 3 3 20 Rear Tractor Assy 1 Remove the printhead see 3 3 1 2 Remove the ribbon protector see 3 3 2 3 Remove the pull up roller assy see 3 3 3 4 Remove the upper cover see 3 3 4 1 5 5 Remove the reset spring see 3 3 17 3 6 Remove the tractor gear 7 Shift the drive shaft to the right side to remove in the direction of the arrow 8 To perform mounting follow the reverse procedure of removal Remark on assembly 1 When the Tra
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49. ly 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 which 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 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 et SS screwdriver 2 6 mm 2 2 200 Phillips 4 Screws I screwdriver 3 5 mm 3 No 3 100 4 screwdriver 4 om Spring hook 1 e Head gap ees i 5 5 SLE J YX4025 83335 3 1 adiusiment 6 lt gt Volt ohmmeter 1 i 7 c Feeler gauge 1 Head gap adjustment 8 7 Pliers 1 9 ST No 5 nippers 1 10 p 1 1 Ibs 500 g 1 bar pressure gauge 3 3 Disassembly Reassembly Procedure This section explains the assembly replacement procedures according to the following disassembly system Parts Layout Control Power supply board Printhead DIE N NEN SOS WU JN x ji i HR A Af Ze GC N SN Operation panel board
50. maining buffer space 256 during receive time out Yes No Turn on the SSD signal gt lt Yes Printer busy No Output one character from the buffer to printer Figure C 2 2 2 3 2 Mode X ON X OFF Received Is DSR valid Yes N No lt Yes Buffer overflow Yes gt No Parity error No error Store the received character in buffer Store 40 H in buffer gt IE Is the printer in DESELECT Yes state or is the paper low Is remaining Yes buffer space 256 Yes Is remaining buffer space gt 256 during receive time out Has 200 ms elapsed after sending DC3 is urned on or has 1 second elapsed No Yes Ready to send Ready to send Yes Yes pend Del Send DC3 Y Y Printer busy No Output one character to printer Figure C 2 3 3 1 3 2 TROUBLESHOOTING FLOWCHART Before Repairing a Fault Before servicing the printer ask the customer in what situation the trouble occurred and record the response Before starting troubleshooting operate the printer in the same situation as that at the time of trouble occurrence to see if the
51. n 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 rotational direction of the gears in the ribbon drive gear assembly This ensures ribbon movement when bidirectional printing is used Figure 2 6 2 2 5 Paper Feed Operation Feeding of the paper is performed by turning the platen and the pin tractor which is driven by the LF pulse motor Item of the paper feed mechanism are as follows a Pulse motor with gears b Decelerating gear Platen d Tractor feed unit e Pressure roller 1 Cut sheet and continuous sheet switching mechanism See Figure 2 8 Three different paper paths can be selected and set by the change lever a TOP for cut sheet When the cut sheet 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 cut sheet At the same time the switch lever positions between the rear switch and bottom switch
52. o 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 which is 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 And the adjusting cam adjusts the headgap toward left and right side in accordance with the guide rail up and down as a position of the left end of it Platen Carriage shaft Printhead Adjusting lever Adjusting screw Idler gear Adjusting gear Range from to Narrows a Printhead Adjusting screw Adjusting cam 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 tank which is built in to the ribbon cartridge Ribbon feed operation Whe
53. of rear Pd holder and shaft EM 30L A Front pressure roller Controller holder Sliding portion of rear roller holder and release shaft cam surface release shaft plane portion EM 30L A Sliding portion of release shaft and rear roller holder EM 30L A Release shaft protruding portion 2 portions EM 30L A Shaft Bearing portion of 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 portions of pull up roller shaft and pull up roller frame EM 30L B Bic Gear and post EM 30L A Models ML3320 ML3321 9 Carriage Assy NK2 10 SUS Bearing portion of guide roller EM 30L B 5 10 6 TROUBLESHOOTING AND REPAIR 6 TROUBLESHOOTING AND REPAIR 6 1 Items to Check Before Repair 2 4 Proceed with the repair as follows 1 Check the inspection items specified in the instruction manual Find out as many details of the trouble as possible from the customer 3 Inspect in the conditions as close as possible to those at the time the trouble occurred Check the trouble status according to Table 6 1 for the details of the trouble Then locate the trouble position according to the detailed flowchart 5 Carry out a thorough test after the repair to check for correct functioning 6 2 Troubleshooting Table Status
54. ollow the removal step in the reverse order Remark on assembly 1 Atthe time of the Switch Lever assembly make sure that the Micro switch on the Main Board works properly Switch lever V Micro switch 4 ADJUSTMENT 4 ADJUSTMENT 1 Be sure to carry out this adjustment with the printer mechanism mounted on the lower cover 2 Be sure to carry out this adjustment operation 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 print head at 3 points the left end the center and 1 Parallelism ad the right end 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 print head 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 Right 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 are disengaged After adjustment mark the adjust cam position with a re
55. on the SCR SO This cause the secondary coil 40V of the transformer to be short circuited causing an overcurrent to flow through the primary coil and making the AC fuse transformer assy open Alarm processing when DC power is low 40V is converted into the POWLEV signal OV 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 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 25V or less 30 2 17 3 Head overheat alarm The voltage of the output TSD signal of the thermistors one of which is contained in the print head and the other in the print head driver is monitored by the CPU AD port to control the voltage Temp Stop A 119 C 7 I aC B C Mode down Mode and print control Direction 1 5 Sec Stop When the temperature is between 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 will stop When temperature gradient is steep higher mode shall
56. over 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 of LSI is used to input the switch data and output the LED data through the operation panel control LSI BU5148S LSI OPTXD gt 77 OPCLK OPCK SS gt Command 1 gt 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 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 eui Buipooep ueo suods eui 1eui os 10 0 0 19 eui esneoag si SIU euin eui 1e suods eui pue
57. rinters and assuming that the printers are operated for 2 hours day of 600 hours year The following codes are used to indicate the number of printers for which maintenance parts are ordered A V N A E A 4 gt E Figure 11 1 Upper Cover Assy Figure 11 1 Upper Cover Assy Q ty No Part No Description Q ty Required Remarks 1 1PP4128 1186P6 Upper cover N 1 2 For ML3320 For INT 1PP4128 1186P4 Upper cover N 1 2 For ML3320 For OEL 1PP4128 1186P2 Upper cover N 1 2 For ML3320 For ODA 1PP4128 1231P6 Upper cover W 1 2 For ML3321 For INT 1PP4128 1231P4 Upper cover W 1 2 For ML3321 For OEL 1PP4128 1231P2 Upper cover W 1 2 For ML3321 For ODA 2 1PA4094 7305G10 Sheet guide assy N 1 2 For ML3320 1PA4094 7308G11 Sheet guide assy W 1 2 For ML3321 3 2PA4128 1237G1 Access cover assy N 1 2 For ML3320 2PA4128 1241G1 Access cover assy W 1 2 For ML3321 EN IS oft Figure 11 2 Printer General Assy Figure 11 2 Printer General Assy X Q ty No Part No Description Q ty Required Remarks 1 2PP4025 2871P21 Platen Knob 1 1 2 4YA4042 1543G301 Control power supply 1 9 For ODA 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 4 4YA4042 1516G3 Operator panel board 1 3 LEOP 3 5
58. surface Remove paper waste and wipe off stain dust ribbon waste etc Hr 7 sa c a D 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 in case the printer is disassembled reassembled cleaned or parts have been changed 1 Cleaning time Remarks 1 Turn off the power before cleaning 2 Make sure that paper dust will not fall inside of the machine Cleaning period 6 months of operation or 300 hours of operation whichever the earlier Cleaning points Carriage shaft and surroundings gt Remove paper and ribbon dust Paper path Clean stains and dusts Paper End Sensor Remove the dust the Sensor Lubricant Pan 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 Apply one drop of oil 0 006 0 002 g Areas to Avoid No Do not lubricate Reason Remarks 1 Platen assembly To prevent stained paper rubber face and illegal paper feed 2 Pressure roller rubber To prevent stained paper Pay attention not to put face the grease on the rubber face of the pressure roller 3 Carriage shaft To stabilize carriage traveling load 4 Ink ribbon To
59. t are explained on the next page 11 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 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 12 APPENDIX D CSF Option Oki Systems Danmark a s Park Alle 382 DK 2625 Vallensbaek Denmark Tel 436 66500 Fax 436 66590 Oki Systems France S A 44 50 Avenue du General de Gaulle 94240 L Hay les Roses France Tel 0146 158000 Fax 0141 240040 Oki Systems Italia S p A Centro Commerciale Il Girasole PAT Cellini Lotto 3 05 B 20084 Lacchiarella Milano Italy Tel 02 900 261 Fax 02900 7549 Oki Systems UK Ltd 550 Dundee Road S
60. 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 attraction 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 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 Aoi Print wire Printhead Platen 1 When printing Paper Armature assembly Thermistor Print wire d u lt 0222 LS 4 Wire guide 2 N Yok oke Spacer Magnet assembly 2 When not printing Paper Figure 2 3 2 22 2 2 2 Spacing Operation See Figure 2 4 The spacing me
61. 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 continuous sheet is fed from the push tractor At the same time the switch lever turns on the rear switch to confirm to the control board that you are in the continuous sheet mode Continuous sheet from bottom feeder option When the change lever is 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 has been set in the bottom tractor feed At the same time the switch lever turns on the bottom switch to confirm to 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 Rotate Rotate or instruction Control Power
62. ubleshooting Make sure of the parameters for RS232C in the menu are correct Baud rate Bit length Parity Protocol Busy signal and its polarity Remedied Yes End Is 8V supplied on Driver board 20 1 J e Remove RS232C I F Board Jey EE 10 e 15 the 8V supplied on the Driver board No Yes e Replace RS232C I F board e Replace Driver board Replace RS232C board Remedied Yes e End Replace Driver board APPENDIX A APPENDIX A BIT IMAGE GRAPH IS DOT DENSITY Double speed Double speed double density quad density 1 de 1 144 inch 40 OF gt a D 1 60 inch DOT 1 120 inch DOT 1 120 inch DOT 1 240 inch DOT p No adjacent dots allowed D 1 60 inch APPENDIX A 1 A PCBLAYOUT PCB list 1 Circuit board SDCT Control Power Supply 2 Circuit board SDDV Driver 3 Circuit board LEOP 3 Operation Panel APPENDIX B SPARE PARTSLIST Quantity per year Indicates the recommended number of each part that should be ordered for routine maintenance for one year for 500 units of p
63. y or not Tension of all of front pressure rollers is properly sure of the fitting position of 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 Faint or dark print Yes Is the print head 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 Replace Ribbon feed mechanism 6 15 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 Line feed trouble e Turn the power off and rotate the platen manually e Does the platen rotate smoothly Yes No e ls the platen gear L broken No Yes e Replace Platen assembly e 15 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

Oki 3321 Printer User Manual

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