Oki 3390 Printer User Manual
Contents
1. PRE Hob t EECS P EECLK P M 1 Start Address Data code Ode EEDIN P NS D15 A DO EEDOUT P M M Bus Ready rk Ed 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 07 ALE RD RDN WRL WRL 1 LSIC Clockout A0 A19 A Y LSICS D0 D15 Address Data Read DO D15 Write Address x 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 carria2. SPU SPV SPW PHASE A c PHASE B m 1 720 GE UTILITY MODE IPT 10 CPI re 1 120 gt IPT 12 CPI Le 1 144 15 re 1 180 ES IPT 17 CPI I 1 206 EN IPT 20 CPI lt 1 240 gt 2 14 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 4 PHASE B FORWARD REVERSE 2 15 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 IC1 BU5148S LSI erp OPTXD gt 77 gt gt Command 4 LED Driver OPCLR N and Data NPA2 gt latch 80 OPRXD OPRD Le 79 5V gt 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
3. 5V PSEN L ov en LE 542ns RD WR I DM ov Figure C 3 3 e No Replace the Q3 Yes Are T1 SELECT and INTO BUSY signals low level No Check Q11 on the SKRA board Yes Are 9V and 9V input to Q1 e Replace defective component in 9 9 volt control circuit Yes 15 pin 1 SSD signal of Q3 High level e No Replace the Q3 Yes Is pin 11 550 of Q1 low level e No Replace the Q1 or the CN1 Yes Is the RxD of Q3 as specified in Figure C 3 4 d 5V RxD d V 0 ST bit SP bit 5V SSD 55 ov Figure C 3 4 No Replace Q2 Yes Replace the Q3 Q 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 No Replace the Q2 Yes Are WR and BUS signals of Q3 pin 3 as specified in Figure C 3 5 542ns WR lt gt 5V ov 033 1 sv 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 154 pin of Q6 identical to WR signal in Figure C 3 5 e No Replace the Q6 Yes Check Q7 LSI 1050210 42 in the SRXD control 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 interf
4. MPU LSI Receive Data NBSY gt lt A D bus P ACK NSTB V RXD P16 NRXD Data 1108 STROBE 500ns max S BUSY NE A ACK Si i 2 8us RXD STB N 2 1 5 Print Control Print data is transmitted as parallel data HEAD1 HEAD24 from LSI to print head LSI generates print timing and drive time Control Power Supply Board Driver Board MPU S LSI A D bus E DRIVER Print Head Print Data Print Data HEAD1 N HEAD1 HEAD24 N HEAD24 HEAD DRIVE TIMING CHART DT1 DT2 HEAD F 0 DRIVE CURRENT 2 10 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 4 21 24 N S 5 20 Time d Simultaneous Compensation of the number of impact pins The LSI is provided with the compensation table for each pin to make necessary compensation Number of impact pins Few Drive time Short lt Long 2 11 e Print mode compensation According to the thickness of the printing mediu
5. 9 0 NG X Je NES Figure 11 2 Printer General Assy Figure 11 2 Printer General Assy Q ty No Part No Description Q ty Required Remarks 1 2PP4025 2871P21 Platen Knob 1 1 2 4YA4042 1545G302 Control Power supply 1 9 Without ROM board SRXC 3 4YA4042 1544G1 Driver board SRXD 1 9 4 4YA4042 1516G4 Operator panel board 1 3 LEOP 5 3PP4044 5360G3 Operation panel 1 2 6 3YS4011 1266P1 AC cord 1 1 7 4YA4023 3101G1 Print head 24 1 10 8 40085501 Fuse 23702 5 1 10 For 120V 125V 2 5A 4YB4042 1551P1 Fuse 2151 25 1 10 For 230 240V 250V 1 25A 9 4YB4049 7105P1 Transformer assy 1 2 ML3390 120V 4YB4049 7106P1 Transformer assy 1 2 ML3390 230 240V 4YB4049 7105P2 Transformer assy 1 2 ML3391 120V 4YB4049 7106P2 Transformer assy 1 2 ML3391 230 240V 10 3PB4050 3429P1 PCB plate 1 2 11 40045601 FG plate 1 2 LO N Figure 11 3 Printer Unit Figure 11 3 Printer Unit No 10 11 12 13 14 15 16 17 18 19 20 21 22 Part No 3PA4044 5002G2 3PA4044 5152G2 3PP4044 5012P1 4PP4044 5019P2 4PP4044 5019P1 4PP4044 5031P2 4PA4025 3327G1 3PP4044 5015P1 3PP4044 5157P1 1PP4044 5021P1 1PP4044 5158P1 3PP4025 3320P2 3PP4025 3507P2 4044 5011 1 3PP4044 5013P1 4PP4025 3340P1 3PP4025 3341P1 4PP4044 5020P1 4PP4044 5163P1 3PP4044 5033P1 4PP4044 5017P1 3PP4044 5014P1 4PP4044 502
6. See Table 6 3 Hardware Alarm has occurred See Table 6 3 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 LQ COURIER GOTHIC SEL LF FF LOAD TEAR PARK UIET EF swss I MENU SHIFT Micro Feed Micro Feed TOF Down Up CHARACTER PITCH 10 12 15 EXIT GROUP ITEM X SET PRINT E Se POWER ALARM MENU RESET Figure 6 1 peog 01u00 JO 4 eoejdeu 4 12095 ON dn 5167 440 00 5002 jou A pueog 4 5 1 10 pJeoq uo eo ejdeu 40419 40418 WNS YOSYUD 4 1 NVH WOH p eog 5 1 2 40419 NYH INaviv Vidas p eog Ajddng U0D 10 WOH eoejdeu dn 01 s eyep 4444 wieje Alddns eoejdeJ 10 pue 440 Jemod 1day SI 10 1209 WIN
7. 2942 00 SI peo swsiueyoou eui Y29049 p eog eoe deu eoeds AGH 1095 JO AQ uous uedo si L uonisod eui oi yoeal Jou seop peeu a y ld payloads P311N990 jou SI 92296 uueje Buroeds NYVIV 5 ONILLOOHSFTANOHL 29115994 ALTILN 02 AV IdSIG 031 2 2 9 NYVIV AYODALVO INHv Iv 6 4 Operation panel board Centro connector AC connector Transformer Control Power Supply Board 64 Connection Circuit Check for Printhead SP LF Motor 1 Printhead Signal FG HD1 HD3 HD9 HO11 COM COM HD17 HD19 HD21 HD22 HD20 HD18 COM COM HD12 HD10 HD4 HD2 TH FG HD5 HD7 HD13 HD15 COM COM HD23 HD24 COM COM HD16 HD14 HD8 HD5 TH Connector pin number CN1 1 gt 2 R i 2 3 R R os 2 4 N R 5 2 5 v t
8. 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 ALARM Printer mode display 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 set to 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 Itis recovered automatically Replace SP motor or Driver Board FATAL ALARM Note BLINK1 400ms ON 400ms OFF BLINK2 200ms ON 200ms OFF
9. INN p eog Alddns 1041U00 10 NO pue 440 y uin SWGQ 19591 SOI pue dn pexoo 51 wieje yM LAM NYVIV NOILOALAG JYVMNEIH Alddns 03u02 ejep ueuM ON NOHd33 p eog Alddns eoejdeu 40119 WNS YOSYD 99 p eog Ajddng eoe deu 40119 SO IM peOy uo p eog Ajddng U0D JO WOH eoe deu 40119 WNS YOOYUD p eog Ajddns eoejdeu ONILOOHSFIANOHL 40419 O4 IM PEOH 3911539 0c Zt 2 1 9 eiqer Nav iv TOYLNOO NIYIN AdODALVD INHv Iv 6 3 p eog Alddns Assy JOION eoeds eoe deyu ejqeo H d dn O 440 002 yug uedo jeubis dec peer dec peeH 1utid Alddns Hd onoeuuoo
10. Release cam Platen Change arm BOTTOM REAR 2 2 6 Paper detection mechanism See Figure 2 15 1 Cut sheet detection When the cut sheet is inserted the 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
11. 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 Carriage frame Encoder disk Encoder sensor Motor gear Slider Guide rail Figure 2 4 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 2 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 gear Adjusting gear Range from to Narrows Printhead Adjusting screw Adjusting cam 2 2 4 Ribbon drive See Figure 2 6 The ribbon driver mechan
12. T1 T2 T3 7 CS1 CS4 RD DO D7 Read WRH WRL DO D7 Write X EN 8 bit bus byte instruction Clockout is provided when the original excitation is selected 4 CG ROM This is a 1024K x 16 bits 16M bits MASK ROM with the font data for the characters stored CG 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 memory access operation MPU ROM 19 S D0 D15 CG N Po2 P PSENP OE MPU CLOCK 19 A ER CG N Program Program Program D0 D15 IN IN IN 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 D1 EECS P P27 gt CS EEDOUT P P25 re DO EECLK P P26 gt SK PRE 5 5 E CS 1 n m Operation Start code Address code 1 1 1 0 5 EEDIN P d ed 5 0 EEDOUT P 015 DO D15 DO D15
13. e End e Replace I F cable 6 19 102 RS232C Printer pin assignment Yes Y Is the correct cable used TXD 2 pin RXD 3 pin No SSD 11 pin DTR 20 pin Change cable DSR 6 pin Is ALARM LED blinking Yes e See tables 6 2 and 6 3 for the troubleshooting 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 Driver Board Is 8V supplied on Driver Board CN2 NO Sa D ecccccccccccccccce V pin10 e Remove RS232C HE Board 48V pin20 e 15 the 8V supplied on the Driver Board No Yes Replace RS232C UE 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 Ar 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 PCBLAYOUT PCB list 1 Circuit board SRXC Control Power S
14. screw in direction B or while the Carriage shaft adjust lever and the adjust gear are disengaged After adjustment mark the adjust cam position with a red 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 H Print head Adjust lever Adjust gear Platen Adjust cam Measure variation of Gap 20 71 gap when range is 0 05 at the changed range 5 Gap between the 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 N Rear Platen Friction position SUR Rear Bottom position Change lever B Center frictio
15. 24 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 Wire guide b Spring assembly Wire Armature Spring Yoke Spacer c Magnet assembly Magnet core coil Yoke d Printed circuit board 2 Operation of printhead 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 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 therm
16. 6 2 N R 89 7 2 8 11 2 9 10 103 13 11 iets 12 2 NOU yi e le al eee 14 1 29 19 ie i 15 121 21 16 2 23 17 g 18 19 pi 2 20 4 21 2 NBA 46 22 2 8 8 23 2 24 149 10 25 PEA 2 2 N 27 28 it 14 2 29 1 2016 16 2 30 ies 18 31 A 1 29 20 32 5 33 1 422 22 2 __34 _____ 1 2124 4 2 35 36 I Thermistor Typ 5 ohm a 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 2 2 oA 10 2000 gB 1 5 MW DA 2 21 18 Vcc f DK G 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 Print Head 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
17. Board Measure for any short circuits between 5V 40V 8V OV EL EP Any short circuit Yes No Yes e Replace Driver Board e Replace Transformer Assy Remedied ES Driver Board No Yes CN2 P e Replace Control Power Supply Board Pin 20 119118 17 16 15 14 13 10 9 7 6 Signal 8V 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 e Remedied No Yes 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 jam while paper insertion Jam 1 e Check th
18. Board SRXD 3 3 13 LF Motor 3 3 14 Operation Panel PCB LEOP 3 3 15 Control Power Supply Board SRXC 3 3 16 Transformer Assy 3 3 17 Change Lever and Gears 3 318 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 6 4 X 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 EH Access cover assy Operation panel assy Main frame 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 Bottom push tractor unit 3 Roll paper stand Narrow only 4 Serial I F 5 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
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20. holder spring 1 1 B 10 Pull Tractor Bottom Tractor Board Figure 11 5 Option Spare Parts B 11 Part 4PA4025 3608G1 4PA4025 3603G1 2PP4128 1239G1 2PP4128 1243G1 1PA4128 1277G1 1PA4128 1277G2 4PP4094 7385G1 4PP4094 7386G1 4YA4021 1050G1 Description Pull and bottom tractor assy L Pull and bottom tractor assy R Tractor cover assy N Tractor cover assy W Bottom push stand L Bottom push stand Paper knife N Paper knife W LXHI PCB RS232 I F Figure 11 5 Option Spare Parts Q ty Q ty Required 2 Co CO Remarks For ML3390 For ML3391 For ML3390 For ML3391 B 12 APPENDIX 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 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 M
21. unoJro e 11 41 3Nvd ds eues NOILVH3dO MS eseejeu INI Jopoou3 dz U9 3 Uue v sei N 13S Ee as INOuda3 9 9 1 99A 051 TC IV S Gell 91 Eled 79 7 NS i xew ZHIN 882721 Bu Jaded 55 450 Y Sna av 099 X 29 EN 1do 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 D Q OE MPU CLOCK A0 A17 x x x PG N PSEN N um VE xr Tum Program Program Program DEN IN IN IN 3 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 e 2 04 0 RAS csi D d CAS 03 RD o JOE Clockout
22. 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 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 40 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 amp 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 amp 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
23. 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 2 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 9 N 2 BIN 3 15 3 3 12 Driver Board SRXD 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 D 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 Q 3 313 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 amp 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 Disconnect the cable from connector of Driver board Disengage c
24. 4P1 2PP4044 5016P1 3PP4044 5023P1 3PA4044 5110G2 3PP4044 5034P1 3PP4044 5162P1 Description Main Frame N Main Frame W Bottom paper end lever Pressure spring F Pressure spring F Roller holder F Front pressure roller assy Release shaft N Release shaft W Paper pan plate N Paper pan plate W Leaf spring N Leaf spring W Paper end lever Sensor lever Change gear Tractor gear Pressure spring R Pressure spring W Roller holder R Change arm Switch lever Idle gear Change lever Reset spring LF motor assy Rear pressure roller N Rear pressure roller W Q ty Q ty Required 2 2 1 Remarks For ML3390 For ML3391 For ML3390 For ML3391 For 3390 For ML3391 For ML3390 For ML3391 For ML3390 For ML3391 For ML3390 For ML3391 For ML3390 For ML3391 For ML3390 For ML3391 For ML3391 For ML3390 For ML3391 For ML3390 For ML3391 Figure 11 3 Printer Unit Kafe Q ty No Part No Description Q ty Required Remarks 23 3PA4044 5025G2 Platen assy 1 3 For ML3390 3PA4044 5159G2 Platen assy W 1 3 For ML3391 24 3PP4044 5010P1 Space rack gear N 1 3 For ML3390 3PP4044 5156P1 Space rack gear W 1 3 For ML3391 25 4PB4025 3377P2 Rack tension spring 1 1 26 3PP4044 5008P1 Guide rail plate N 1 1 For ML3390 3PP4044 5155P1 Guide rail plate W 1 1 For ML3391 27 3PP4025 2810P1 Adjust cam 1 1 28 4PP4044 500
25. 8110 uononuisui aM lt lt 8 N 2 17 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 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 ASS open Alarm processing when DC power is low 40V is converted into the POWLEV signal to 5V by R531 and R532 and input into the A D port of the MPU to control the drive time and the print speed pass number of the head 40V R531 POWLEV R532 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 18 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 119
26. 9P1 Carriage shaft N 1 1 For ML3390 4PP4044 5009P2 Carriage shaft W 1 1 For ML3391 29 3PP4044 5005P1 FG plate L 1 1 30 3PA4044 5050G2 Pull up roller assy N 1 2 For ML3390 3PA4044 5165G2 Pull up roller assy W 2 For ML3391 31 4PP4044 5116P1 Idle gear 24 1 4 32 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 ML3390 4PP4025 3335P4 Drive shaft 1 2 For ML3391 35 3PP4044 5046P1 Tractor sheet guide 1 2 For ML3391 36 4PB4044 5095P1 FG plate A 1 2 37 3PP4044 5089P1 Change gear shaft 1 2 Figure 11 4 Carriage Assy Figure 11 4 Carriage Option Assy No Part No Description Q ty E T 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 1 2 5 3PP4044 5065P1 Guide roller holder 1 2 6 4YA4044 5120G1 Space motor assy 24 1 4 7 1 4044 5506 1 Head cable 9N 1 5 For ML3390 4044 5507 1 Head cable 9W 1 5 For ML3391 7 2 3PB4044 5508P1 Head cable 24N 1 5 For ML3390 4044 5509 1 Head cable 24W 1 5 For ML3391 8 3PB4025 1241P1 PC connector 36 40 1 2 9 3PA4044 5070G2 Gear assy 1 3 10 3PP4044 5068P1 Head clamp holder 1 1 11 4PP4044 5067P1 Head plate 1 1 12 3PP4044 5064P1 Ribbon protector frame 1 2 13 4PP4025 3397P2 Back up roller holder spring 1 1 14 4PP4044 5066P1 Guide roller
27. 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 be specified directly 2 19 2 1 9 Power Supply Circuit This power supply circuit supplies the 5VDC 8VDC 40VDC 10VAC Control Board SW Noi d Ino We 0 91 Rectifier 40v Fuse circuit Trans former _o gt Rectifier M 48V Regulation 45V Circuit gt 1 The uses of output voltages and signals are described below Voltage signal Use 45V Logic IC LED drive voltage 48V Serial interface line voltage and SP motor driver 40V Printhead LF motor drive voltage SP motor drive voltage AC 10V Option board 2 2 2 2 1 Mechanical Operation Printhead mechanism and operation See Figure 2 2 The printhead is a spring charged 24 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 o 23
28. OKI MICROLINE 3390 3391 PRINTER Maintenance Manual All specifications are subject to change without notice PREFACE This maintenance manual describes how to maintain the Microline 3390 3391 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 2 3 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 39 Carriage Cable 3 3 10 Backup Roller Holder Assy 3 3 11 Platen Assy 3 3 12 Driver
29. Paper end sensor Sensor lever 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 the 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 e 14 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 TOP 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 in 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 o
30. R 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 remaining 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 C X ON X OFF Received one No character 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 t
31. ace connector TD 3 RD 4 RTS 5 Equivalent to Cannon DB 25P CTS 8 CD 11 SED 5 DTR DSR 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 test are explained on the next page G 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 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
32. aten 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 Continuous sheet form Pull Tractor assembly Drive gear Idle gear LF motor Platen Platen gear LF Idle gear Figure 2 12 6 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 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 Change lever
33. 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 16 eui Buipooep ueo suods eui JEU os 10 14 01 0 19 eui asneoaq si siu out eui 1e eui pue eui ees UBD uonNensnijl SU uoJ4 3 0N serisna uym 19594 puooes esuodsai puewwog Si SON 18411 esuodsas puewwog EN Fg Fg T rd Lug i I I A sie x puooes puewwog b 15 p Y EIS Ig SCH o ob e 2 1 UoissiuusueJ9J 10 uononugsu uoneoynou 10113 ON 10 MO 101 0840 asuodsay peau 10 uononujsui ejep q3140 eiu 51 lt 19501 1
34. ccording to the following disassembly system Parts Layout Upper cover assy Control Power supply board 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 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 3 3 6 connector 3 3 7 Space motor and guide roller assy 3 3 8 Space rack m 3 3 9 Carriage cable 3 3 10 Back up roller holder assy m 3 311 Platen assy 3 3 19 Paper pan 3 3 12 Driver board SRXD 3 313 LF motor 3 3 18 Carriage shaft 3 3 14 Operation panel PCB LEOP 3 3 15 Control Power supply board SRXC 3 3 16 Transformer assy 3 317 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 2 3 4 Open the access over Pull up and rotate the head clamp to unclamp the printhead as shown fig 3 3 1 Disconnect the printhead from PC connector To 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 The head clamp must surely sandwiched between printhead and carriage frame amp as sho
35. e 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 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 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 1 No 1 100 Phillips 1 Screws et SS screwdriver 2 6 mm 2 No 2 200 Phillips 1 Screws 1 screwdriver 3 5 mm 3 No 3 100 1 screwdriver 4 om Spring hook 1 Head gap ees i 5 5 BETTER J YX4025 83335 3 1 adiusiment 6 lt gt Volt ohmmeter 1 i 7 Feeler gauge 1 Head gap adjustment 8 lt lt Pliers 1 9 ERE No 5 nippers 1 10 p 1 1 Ibs 500 g 1 3 3 Disassembly Reassembly Procedure This section explains the assembly replacement procedures a
36. e 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 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 BOTTOM Continuous sheet from bottom feeder option When the change lever is set in the 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 BOTTOM position the rotation of the platen At the same time the switch lever turns on the bottom switch to confirm to the control boa
37. e ribbon protector e Check the pull up roller cover is closed properly Pull up roller cover Platen Paper Ribon Protector P Jam 2 wrinkled paper e Check around pressure roller mechanism Front pressure springs are narrow pcs wide 5 pcs mounted properly 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 See Tables 6 2 and 6 3 for troubleshooting information e Replace print Head e Remedied No Yes End e Replace Driver Board e Remedied No Yes e End e Replace carriage cable or space motor assembly 6 14 Faint or dark print Yes Is the print head gap set properly No e Adjust the print head gap see section 5 e Remedied No Yes e End Replace print Head 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 Line feed trouble Turn the
38. essage 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 CN Receiver N R data bus N NN NN ADR bus NNN Serial data 5 VD 9 V control line 10 VAC 9 V power supply circuit 9 V Bus line 45V 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 3 C Ready Busy Received one character No Is DS
39. f the sheet by changing the TOF position Sheet setting 5 V a q Time out PE V Detection timer DN gt Time selected on the menu LF action ERN SW1 REAR BOTTOM TOP GI In BOTTOM REAR ru Figure 2 17 2 When using the continouos paper 1 en RE D 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 pape
40. ge homing and determines the LF motor phase Finally the program establishes the interface signals PUE ACK P signal sending and S I F 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 Start 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 VF BUSY OFF Parallel VF ACK Send End 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 CN BUSY gt ACK N
41. he removal steps in the reverse order Remark on assembly Match the posts at the both sides of the Sheet Guide amp with the arrow marks on the upper cover Push the Guide into the Cover 3 3 5 Gear Case 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 Q 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 G To assemble align the direction of the SP motor axis 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 36 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 not touch the space motor or terminals of PC connector Also take care to avoid dust or foreign matters 2 After installation check and adjus
42. ial Complex Tallaght Dublin 24 Ireland Tel 01 459 8666 Fax 01 459 8840 Oki Systems Sweden AB Box 131 5 163 55 Spanga Stormbyv egen 2 4 Sweden Tel 08 7955880 Fax 08 7956527 Oki Europe K pviselet International Trade Center H 1075 Budapest Bajcsy Zsilinsszky t 12 11 em 204 Hungary Tel 361 266 6225 Fax 361 266 0152 Oki UK Ltd 3 Castkecary Road Wardpark North Cumbemauld G68 0DA Scotland Tel 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 521369 4 96 Printed in Japan
43. idge Ribbon Load measurement portion Adjustment method To confirm Ribbon shall be fed smoothly when the carriage is moved from side to side To confirm 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 TROUBLESHOOTING FLOWCHARTS 5 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 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 c
44. 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 Platen gear Tractor gear Idle gear Change gear Figure 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 amp Get the paper which is fed in front of the platen to the pull tractor amp Set the change lever to the position and feed paper using the platen knob If paper slack is removed set the change lever to the REAR position Pull tractor Drive gear Idle gear Platen gear Figure 2 11 5 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 pl
45. ism 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 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 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 Pulse motor with gears Decelerating gear c Platen Tractor feed unit 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 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 th
46. istor signal Printing will then be intermittent or stop completely until the coil temperature falls below the limit value Print wire Printhead Platen 1 When printing Paper Armature assembly Print wire Thermistor Spacer Magnet assembly 2 When not printing Paper Figure 2 3 2 23 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 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
47. laws on both sides from the frame and remove the operation panel Open claws 8 places and remove the operation panel PCB from the operation panel To install follow the removal steps in the reverse order 3 18 3 3 15 Control Power Supply Board SRXC 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 the connector amp 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 amp 3 19 3 3 16 Transformer Assy Remove the upper cover see 3 3 4 1 5 Remove inlet amp 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 amp and the change gear 3 Push back the protrusion of the Change Gear Shaft amp
48. leaner 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 surface Remove paper waste and wipe off stain dust ribbon waste etc Uu mi Zb Lee Carriage 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 rese ime Remove paper and ribbon dust Paper path Clean stains and dusts Paper End Sensor Remove the dust on 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 e Small amount Apply one drop of oil 0 006 0 002 g Areas to Avoid Reason Remarks Do not lubricate Platen assembly rubber face To prevent stained paper and illegal paper feed 2 Pressure roller rubber face To
49. m the print mode is compensated as shown in the table below Head Gap Range 1 2 3 4 5 Print speed 100 9596 85 85 80 Drive time lengthens at each step 2 12 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 8A 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 ps SPV D x 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 13 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
50. n ottom Gap between the platen and the pressure roller ee H 2 Platen Front pressure roller Pressure roller Adjustment method Confirm followings 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 cartr
51. o 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 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 D The data is not received using a serial interface A protocol 15 set to READY BUSY state and BUSY LINE is in 550 state Is the OSC oscillation waveform as specified in Figure C 3 1 90ns 410 DN 0to 1V Figure C 3 1 No Replace the OSC L Yes Is a RST signal in Q3 is as specified in Figure C 3 2 e 0V Figure 3 2 e No Check the RST circuit on the SRXC board Y Yes Are ALE PSEN RD WR signals as specified in Figure C 3 3 542ns 18008 o 5V ALE DN
52. ove in the direction of the arrow 8 To perform mounting follow the reverse procedure of removal Remark on assembly 1 When the Tractor Assy L amp have been detached from the Drive Shaft align the protrusions 6 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 Match the Main Frame Rib A with the protrusion B of the Release Shaft Remove rear pressure SP assy G 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 ML3391 Make sure that the Release Shaft amp 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
53. 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 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 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 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
54. prevent stained paper Pay attention not to put the grease on the rubber face of the pressure roller 3 Carriage shaft To stabilize carriage traveling load 4 Ink ribbon image To prevent blurring of print 5 Pin tractor 6 Flexible cable To prevent stained paper To prevent loose connection and crack 7 Motor PCB To prevent loose connection 8 Connector terminals To prevent loose connection 6 SPARE PARTS LIST 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 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
55. r 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 ls 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 ASSEMBLE DISASSEMBLE 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 aana N 22 5 5 Remove the AC cable and the interface cable before disassembling or 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 aplug AC receptacl
56. rd that you are in the continuous sheet mode Correlation in Mechanism Mechanism Rear Lever Switch Position Bottom Switch Tractor Gear Sheet Insertion Rotate Manual automatic CSF Operation SW or instruction Operation SW or instruction BOTTOM Operation SW or instruction Control Power N Bottom switch Switch lever Change Change Release shaft Change arm Change lever 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
57. t the gap between platen and printhead see 4 1 3 10 3 3 7 Space Motor Guide Roller Assy 1 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 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 amp 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 1 Note Remove the printhead see 3 3
58. 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 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 aunbig HOG da UD induri 9y HON OF 191994 9 91 99A A Ob GAS sn4 18934 josey uue v dS
59. 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 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 Bun 2 Micro switch 4 PERIODIC MAINTENANCE 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
60. upply 2 Circuit board SRXD Driver 3 Circuit board LEOP Operation Panel 1 Control Power Supply Board SRXC Short Plug Setting Default SP1 1 2 4 MbitEPROM 2 3 2 3 1M 2 Mbit EPROM SP2 A B and SP2 A B SP 3 A B and To use program ROM of Q1 SP3 B SP2 A SP3 A and SP2 B SP3 B To use program ROM of Q2 2 2 3 No relation for any setting Do not change default setting APPENDIX B SPARE PARTS LIST Quantity per year Indicates the recommended number of each part that should be ordered for routine maintenance for one year for 500 units of printers 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 2 P 7 A V N A AN Figure 11 1 Upper Cover Figure 11 1 Upper Cover No Part No 1PP4128 1186P3 1PP4128 1231P3 1PA4094 7305G10 1PA4094 7308G1 1 2PA4128 1237G1 2PA4128 1241G1 Description Upper cover N Upper cover W Sheet guide assy N Sheet guide assy W Access cover assy N Access cover assy W Q ty Q ty Required Remarks For ML3390 For ML3391 For ML3390 For ML3391 For ML3390 For ML3391
61. with a flatblade screw driver to remove the change lever 4 To perform mounting follow the reverse procedure of removal Remark 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 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 1 Remove the 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 4 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 rem
62. wn fig 3 3 2 Be sure to check the gap between platen and printhead See 4 Be careful not to touch the print head while it is very hot Figure 3 3 1 3 3 2 Ribbon Protector Remove the printhead see 3 3 1 Open the pull up roller cover Raise and remove the ribbon protector amp N 3 To install follow the removal steps in the reverse order 3 3 3 Pull up Roller Assy 1 Open the access cover 2 Lift up the sheet guide Assy to remove Note Please do after always removing the sheet guide Assy when the pull up roller Assy is installed and removed 3 Tilting the pull up roller Assy toward the front remove from the shaft of platen Assy 4 install follow the removal steps the reverse order x gt gt 2 Pt Pt I 77 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 amp to remove To install follow t
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