OKIDATA ML1120 Maintenance Manual Download Page 64

Page: 64 / 83

43471801TH Rev.1

64 /

Oki Data CONFIDENTIAL

Tractor assy

Apply a small amount of GEP to the sliding
surfaces of the tractor-side side frame R and
the sprocket wheel.

Apply a small amount of GEP to the
surface that slides along the tractor

Drive shaft

Tractor frame R

Sprocket wheel

Apply a small amount of GEP
to the gear tooth surfaces.

Apply a small amount of GEP to the sliding
surfaces of the tractor frame L and the sprocket wheel.

Apply a small amount of GEP to the surface that slides along the tractor shaft.

Sprocket wheel

Tractor frame L

Locking lever

Tractor frame L

Tractor frame R

Apply a small amount of GEP to the sliding surfaces
of the tractor frames L & R and the locking lever.

Summary of Contents for ML1120

Page 1: ...awing No Name Related drawings ML1120 PRINTER Maintenance Manual Rev 1 No 01 43471801TH ML1120 Maintenance Manual 1 83 2006 10 10 Yoshifumi Igari Yoshifumi Igari 43471801TL ML1120 Disassembly for Maintenance 43471801TR ML1120 RSPL Yoshifumi Igari 1 2004 05 21 HP9 0009 Change format Tomoyo Sugiyama Akio Kikuchi 43516901TM ML1190 Troubleshooting Manual ...

Page 2: ...43471801TH Rev 1 2 Rev No Date No Corrected items Page Description of change Person in charge Document Revision History Oki Data CONFIDENTIAL 1 2006 10 10 ISSUE ODS Y Igari ...

Page 3: ...CONFIDENTIAL PREFACE This maintenance manual describes how to maintain the ML1120 printer in the field This manual is for customer engineers For further information refer to the Users Manual for handling or operating the equipment ...

Page 4: ...ed Operation 16 2 3 6 Paper Detection Mechanism 23 2 3 7 Automatic Sheet Feed See Figure 14 25 2 3 8 Paper Park Function Continuous paper 27 3 ASSEMBLY DISASSEMBLY 28 3 1 Precaution for Parts Replacement 28 3 2 Service Tools29 3 3 Disassembly Reassembly Procedure 30 3 3 1 Ribbon Protector 32 3 3 2 Printhead 33 3 3 3 Pull up Roller Assy 34 3 3 4 Upper Cover Assy Access Cover Assy and Sheet Guide As...

Page 5: ... CLEANING AND LUBRICATION 59 5 1 Cleaning 59 5 2 Lubrication 60 6 TROUBLESHOOTING AND REPAIR 66 6 1 Items to Check Before Repair 66 7 PROGRAM UPDATE76 7 1 Prepare to amount the ROM76 7 2 Creating EPROM for rewriting flash memory and installing it 76 7 3 Operation to start flash download 77 7 3 1 Execution of the rewite operation 77 7 3 2 Operation Check 78 7 4 Initial condition 78 8 PARTS REPLACED...

Page 6: ...nfiguration The standard configuration of the ML1120 is as follows Figure 1 1 Printer Configuration Platen Knob Access cover assy Ribbon cartridge Pull up roller assy Upper cover Operation panel assy Sheet guide assy Print unit Fuont View Rear View Control board Power Supply board ...

Page 7: ... each item is listed below 1 Print head Prints with the 9 wire dot magnet The dot patterns are configured in the print control unit 2 Space system The stepping motor moves the carriage and performs spacing tab and carriage return 3 Paper feed system Paper is feed by the stepping motor 4 Ribbon feed system Ribbon is feed by obtaining drive force from the stepping motor just as in the space system 5...

Page 8: ...r etc 4 LSI MG74Q514 131 This is an LSI exclusively for the print head controller external interface and motor control It has the following functions a Print head data control Print data is unarchived to the print timing of a disperse allocation head and controls 24 pin worth of impact data drive time b Dot timing generating function Dot timing IPT in sync with the print speed is generated and not...

Page 9: ...Position Sensor SWI4 SWI1 SWI5 SWI3 SWI2 RAS Buffer Temperature sensor CS0 P00 CS2 CS2 ALM ALM ALM P02 Buffer WR D00 D15 WE OE BYTE CE RAS OE UCAS LCAS RAS BYTE CE OE A19 MG74Q514 131 Alarm Circuit IN Alarm Circuit Out Operator Board Program ROM CLK A00 A19 3 3V 5 0V 3 3V 5 0V HTEMP N DCLOW RD EECS EEDOUT EECLK P16 P17 A00 D00 D15 DRL RD LWR RAS LSIRST BREQ BACK WRH RD WRL LPG WR 3 3V 5 0V TXD RXD...

Page 10: ...ive data data standby mode and completes initialization Paper end mode when using continuous form is excluded 2 2 3 Controlling the interface 1 Parallel interface Data from the interface is input from the connector CENT and is read in the timing of the STB N signal by the interface print head and LSI for motor control MG74Q514 131 When this signal is being process the BUSY signal goes ON When the ...

Page 11: ...ill rise after continuous heavy duty print jobs Therefore when the head rises beyond a specified temperature a thermal alarm mode will be entered and after the current line is printed the speed for printing the following lines will be decreased Furthermore if the head temperature does not fall the following lines will be divided into two depending on the temperature and printed by single direction...

Page 12: ... be printed are detected by the control circuit currents flow through the corresponding coils to nullify the magnetic flux generated by the permanent magnet between the armatures corresponding to those coils and the permanent magnet pole As a result those armatures are driven toward the platen by the force of the armature springs and the print wires fastened to those armatures eject from the tip o...

Page 13: ...es along the carriage shaft The space mechanism is driven by a space motor located behind the carriage frame The space mechanism consists of a Stepping motor with motor gear b Carriage frame c Carriage shaft d Carriage position sensor e Slide rail 1 Spacing operation A carriage carrying a print head moves on its shaft parallel to a platen As a space motor revolves the power of the space motor is t...

Page 14: ...rd and away The movement of the adjust lever rotates the carriage shaft that is connected directly to the adjust lever The carriage shaft is decentered against the fulcrum of the adjust lever section fit with the carriage shaft therefore the carriage shaft moves towaed and away when the adjust lever rotates The print head then moves towaed and away the platen Figure 4 Print head Print head Adjusti...

Page 15: ...on cartridge The use of a one way feed endless ribbon provides clear print results 2 Feed operation Ribbon feed is initiated at the same time the spacing operation is initiated regardless of the mode and stops when the spacing operation is ceased The rotation of a driven stepping motor is transferred to the drive roller in the ribbon cartridge via the ribbon gear which feeds the ink ribbon Figure ...

Page 16: ...ation Feeding of the paper is performed by turning the platen and the pin tractor which is driven by the LF stepping motor Item of the paper feed mechanism are as follows a Stepping motor with gears b Decelerating gear c Platen d Tractor feed unit e Pressure roller ...

Page 17: ...in the rear position the change gear is engaged with the tractor gear and the rotation of the LF motor is transmitted to the tractor gear via the idle gear and the change gear The rotation of the tractor gear rotates the tractor shaft which in turn feeds the continuous form set in the push tractor At the same time the change lever turns off TOP REAR_SW conveying to the control board that the chang...

Page 18: ...43471801TH Rev 1 18 Oki Data CONFIDENTIAL Figure 6 Platen gear Platen Change gear Change lever Pull up gear24 Idle gear Top Rear changswitch Change lever BOTTOM TOP Rear ...

Page 19: ...celerating gears LF idle gear platen gear to the platen When using cut sheet paper the change lever must be in the TOP position to grab the paper while disengaging the push tractor When the change lever is set to the TOP position the cut sheet is automatically fed in up to the print start position after pausing for the wait time stored in the menu Platen gear Idel gear Stepping motor LF motor Plat...

Page 20: ...ansmitted 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 LF motor Idle gear Tractor gear Tractor Change gear Paper Platen gear Figure 8 ...

Page 21: ...the platen the assy is used for bottom pull feed The rotation of the LF motor is transmitted via the platen gear and the pull up gear and rotates the tractor gear The rotation of the tractor gear rotates the tractor shaft which in turn feeds the continuous form set in the tractor assy into the print start position Platen Platen gear LF motor Idle gear pull gear Tractor gear Figure 9 ...

Page 22: ... 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 change lever Open or close of front pressure roller Open or close of rear pressure roller BOTTOM REAR OPEN OPEN TOP CLOSE CLOSE Platen Front roller Change lever Rerizu shaft TOP REAR BOTTOM Figure 10 ...

Page 23: ... that it has blocked and the paper sensor detects ON 2 Bottom feed detection See Figure 12 When paper is fed from the bottom the bottom sensor lever is pushed down by the paper and the bottom sensor detects ON When the tail end of paper has passed the bottom sensor the sensor lever returns into position and the bottom sensor detects OFF Sensor arm Bottom sensor Paper end sensor Bottom sensor lever...

Page 24: ...int 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 Carriage frame assy Print head Figure...

Page 25: ...n 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 85 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 t...

Page 26: ...e paper up to the print start position 5 The paper is fed in up to the TOF position Factory default 0 85 inches from the top Push down the FF LOAD switch 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 ja...

Page 27: ...paper end occurs or 22 inches maximum have been fed 3 The paper is fed in reverse to leave the paper on the push tractor Alarm LED lights up when P E is not detected after 22 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 22 inches Paper end detect...

Page 28: ...rst then insert the AC input plug into a receptacle Interface cable Centro Interface cable USB Interface cable RS Inlet AC cable AC receptacle AC input plug 2 Do not disassemble the printer as long as it is operating normally 3 Do not remove unnecessary parts and limit the disassembly area as much as possible 4 Use the designated service tools 5 Carry out disassembly in the prescribed sequence oth...

Page 29: ...ecessary for replacing printed circuit boards and parts of units in the field Table 3 1 Service tools 1 No 2 200 Phillips 1 Screws screwdriver 3 5 mm 2 No 3 100 1 screwdriver 3 Spring hook 1 4 Volt ohmmeter 1 5 Feeler gauge 1 Head gap adjustment 6 Pliers 1 No Service Tool Q ty Use Remarks ...

Page 30: ...cedure This section explains the assembly replacement procedures according to the following disas sembly system Parts Layout Platen Knob Access cover Assy Ribbon cartridge Pull up roller Assy Upper cover Operation panel Assy Sheet guide Assy Print unit Control board Power Supply board Tractor Assy ...

Page 31: ...r Access Cover assy and sheet Guid Assy 3 3 5 Platen Assy 3 3 6 Print Unit 3 3 18 Control board Assy 3 3 17 Operation Panel Board Operation Panel cord 3 3 7 Carriag Cable Homing Sensar 3 3 8 Idle pulley 3 3 9 Ribon feed Assy 3 3 10 Stepping Motor Space 3 3 11 LF Motor 3 3 13 Slider Pice slider 3 3 12 Gap sensar cable Gap SW and continuous form cut sheet SW 3 3 14 Sp Belt 3 3 15 Paper pan assy and ...

Page 32: ... 1 32 Oki Data CONFIDENTIAL 3 3 1 Ribbon Protector 1 Open the access cover 1 2 Open the pull up roller cover 3 Raise and remove the ribbon protector 2 4 Assemble in the reverse order of disassembly 1 2 Pull up cover ...

Page 33: ...er of disassembly Notes 1 Insert the printhead 2 into the Flat cable 3 while pushing it against the carriage frame be careful not to damage cables when attaching the flat cables 2 The head clamp must surely be sandwiched between printhead 3 and carriage frame as shown Figure 2 3 Be sure to check the gap between platen and printhead see 4 4 Be careful not to touch the print head while it is very ho...

Page 34: ...i Data CONFIDENTIAL 3 3 3 Pull up Roller Assy 1 Open the access cover 1 2 Tilting the pull up roller Assy 2 toward the back remove from the shaft of platen Assy 3 Assemble in the reverse order of disassembly 1 2 Platen Assy ...

Page 35: ... 4 Remove the tractor Assy 3 5 Remove the pull up Assy 4 6 Remove the two screws 5 in the rear 7 Detach the claw A at the rear of the upper cover 6 8 Insert a flat blade screwdriver into grooves 3 places B of frame and twist to disengage claws of upper cover 6 9 Raise the upper cover Assy 6 to remove 10 Remove the access cover Assy 7 11 Assemble in the reverse order of disassembly Chenge lever 1 6...

Page 36: ...e 3 3 4 7 Turn the change lever to the rear position 8 Open the claw and remove the pull up gear1 9 Remove the ground spring2 10 Push in the lock levers on both sides to sides to unlock from the frame 11 Remove the platen Assy3 from printer unite 12 Assemble in the reverse order of disassembly Note 1 Align the gears of the double gear on the right of the platen Assy as shown in the illustration 2 ...

Page 37: ...e from the connectors 3 Remove the four mechanical locking screws 1 4 Lift up and remove the printer unit 2 5 Assemble in the reverse order of disassembly Notes 1 Take care not to fold the carriage cable during installation Curre slightly the carriage cable when assembling into the fastenera 2 Make sure that there is not any dust or oil on the connector contact sectious A If it is found wipe it of...

Page 38: ...ove the head cable clamp 6 Remove Flat cable 1 from the head cable clamp 2 7 Remove the homing sensor 3 photo interrupter from the head cable clamp 2 8 Assemble in the reverse order of disassembly Notes 1 Take care not to fold the head cable 1 during installation Curve slightly the head cable 1 when assembling into the fasteners 2 Make sure that there is not any dust or oil on the connector contac...

Page 39: ... unit See 3 3 6 3 Remove the locking screw 1 of the idle pulley bracket 2 4 Remove the plate tension spring 3 5 Remove the pitch belt 4 from the pulley on the space motor side 6 Remove the E ring 5 and remove the idle pulley 6 and washer 7 7 Assemble in the reverse order of disassembly A A 1 7 5 6 4 3 Space motor 2 ...

Page 40: ...L 3 3 9 Ribbon Feed Assy 1 Remove the upper cover See 3 3 4 2 Remove the printer unit See 3 3 6 3 Remove the idle pulley See 3 3 8 4 Disengage the three claws and remove the ribbon feed Assy 1 5 Assemble in the reverse order of disassembly 1 ...

Page 41: ...oard 4 Remove the locking screw 1 of the idle pulley bracket 5 Push the mini pitch belt in the direction of the arrow and remove the mini pitch belt 2 from the space motor pulley 6 Remove the two screws 3 locking the space motor 4 in place and remove the space motor 4 from the lower base 7 Assemble in the reverse order of disassembly Idle pulley bracket Space motor cable Lower base 1 2 4 3 ...

Page 42: ... 1 Remove the upper cover See 3 3 4 2 Remove the printer unit See 3 3 6 3 Remove the two screws 1 locking the LF motor in place 3 and remove the LF motor 2 The LF motor plate 3 will come off with the motor 4 Assemble in the reverse order of disassembly 1 2 3 ...

Page 43: ...er HG 2 5 Open the three claws of the side frame and remove the adjustment lever 2 6 Open the claw on the side frame and remove the continuous form cut sheet SW 3 7 Open the claw on the side frame and remove the range 1 SW 4 8 Open the claw on the side frame and remove the gap SW 5 9 Assemble in the reverse order of disassembly Notes 1 Be careful not to damage the range 1 SW 4 lever when attaching...

Page 44: ...able guide 1 5 Remove the two screws 2 and remove the carriage plate 3 6 Remove the slider 4 and the slider piece5 from the carriage plate 7 Assemble in the reverse order of disassembly Notes 1 When installing the space motor align the face A with carriage frame and push portion B against the frame 2 After installation check and adjust the gap between platen and printhead see 4 1 1 2 3 4 5 ...

Page 45: ...6 4 Remove the idle pulley bracket See 3 3 8 5 Remove the two screws 1 and remove the carriage plate 2 6 Remove the mini pitch belt 3 7 Assemble in the reverse order of disassembly Note 1 When fastening the belt with the carriage plate 2 make sure that the teeth are engaged with each other and that the belt 3 is not bent as shown in the illustrations below 2 1 2 3 3 ...

Page 46: ... in the direction of the arrow Release the six claws of the paper pan Assy 2 from the lower base and remove the Assy 7 Align the protrusion of the release shaft 3 with the groove in the paper pan 2 and while pushing down both ends of the roller Assy 4 draw out the release shaft 3 8 Remove the release spring 5 front roller 6 and rear roller 7 from the roller Assy 4 9 To perform mounting follow the ...

Page 47: ...elease the two claws of the sensor arm holder Assy 1 and remove the paper pan Assy 6 Remove the sensor arm 2 7 Open the two claws and remove the bottom sensor 3 8 Remove the photo interrupter 4 9 Remove the sensor cable 1P 5 from the bottom sensor 3 and photo interrupter 4 10 To perform mounting follow the reverse procedure of removal Remake on Assembly 1 After assembling make sure that the sensor...

Page 48: ...y 1 3 Release the two claws of the operation panel frame 1 remove the board LSO 2 and core 3 4 Assemble in the reverse order of disassembly Remark on assembly 1 Make sure that there is not any dust or oil on the connector contact section A If it is found wipe it off by aicohol 2 When connecting the cable to the connector make sure that they are securely locked and not joined askew OK NG 1 2 3 A ...

Page 49: ...nit See 3 3 6 3 Disconnect the serial cable from the connector on the control board 4 Disconnect the power supply cable from the connector 5 Remove the three screws 1 6 Open one claw on the lower cover and remove the control board 2 7 Assemble in the reverse order of disassembly Lower cover Power supply cable Serial cable 1 2 ...

Page 50: ...6 Remove the AC switch 6 from the lower cover 7 Remove the screw 7 of the ground wire 8 and remove the inlet 9 from the lower cover 8 Remove the four screws 0 open the claw on the lower cover and remove the power supply 9 Assemble in the reverse order of disassembly Notes 1 Make sure that the AC switch is installed in the direction shown in the illustration 2 Make sure that the inlet is installed ...

Page 51: ... 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 3 Perform this adjustment at normal room temperature 20 C 5 C and humidity 4 Preparations Turn off the AC switch and disconnect the power cable Remove the pull up unit Remove the tractor assy Remove the sheet guide assy Remove the upper cover ...

Page 52: ...knob on the right side of the printer forward or backward to adjust for the difference 2 Turn the adjust ment lever into the range 1 3 Rotate the adjustment lever and the adjust knob forward or backward to adjust the right left and center gaps to the specified value 0 41 0 03 mm Initial adjustment Make sure that the left edge of the carriage plate aligns with the symbol on the upper cover when it ...

Page 53: ...continuous form roll paper on the rear tractor or bottom tractor 2 Print the test data from the PC dedi cated to testing 3 Check to confirm that the top posi tioning distance is within the specified range Preset 0 5 mm Cut sheet manual feed Continuous form rear Top position A 0 5mm B 0 5mm A B 0 5mm ex ML 1120 operation panel is shown 1 2 3 4 4 If this lies outside the specified range correct as d...

Page 54: ...n Move 6 144 inches 1 06 mm down from the reference position Move 5 144 inches 0 88 mm down from the reference position Move 4 144 inches 0 71 mm down from the reference position Move 3 144 inches 0 53 mm down from the reference position Move 2 144 inches 0 35 mm down from the reference position Move 1 144 inches 0 18 mm down from the reference position Reference position Move 1 144 inches 0 18 mm...

Page 55: ...eference position Move 0 06 mm forward from the reference position Reference position Move 0 06 mm back from the reference position Move 0 18 mm back from the reference position Move 0 24 mm back from the reference position Move 0 35 mm back from the reference position Move 0 41 mm back from the reference position Move 0 53 mm back from the reference position Move 0 59 mm back from the reference p...

Page 56: ... Print Registration 1 LOAD TEAR LOAD 0 LOAD TEAR LOAD 0 Print Registration 2 Set Up LOAD TEAR LOAD 0 Print Registration 3 Set Up Move 0 35 mm to the right from the reference position Move 0 32 mm to the right from the reference position Move 0 28 mm to the right from the reference position Move 0 25 mm to the right from the reference position Move 0 21 mm to the right from the reference position M...

Page 57: ...ress 2SW 3 Press 3SW to feed paper into the printer Continue pressing 3SW to feed paper farther into the paper cut position Check to confirm that the perforations are positioned within the specified range If they lie outside the specified range perform the correction below Paper cut position check 0 0 3 mm Item Pull up cover Continuous form Perforations 0 0 3 ...

Page 58: ...ve 6 144 inches 1 06 mm down from the reference position Move 5 144 inches 0 88 mm down from the reference position Move 4 144 inches 0 71 mm down from the reference position Move 3 144 inches 0 53 mm down from the reference position Move 2 144 inches 0 35 mm down from the reference position Move 1 144 inches 0 18 mm down from the reference position Reference position Move 1 144 inches 0 18 mm up ...

Page 59: ...aned 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 Remove pape...

Page 60: ...t PM 3 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 4 Areas for which lubrication is prohibited No Prohibited areas Reason Remarks 1 2 3 4 5 6 7 8 9 Platen surface Pull roller surface Paper running surface of paper pan Paper running surface of tractor assy Paper running surface of pull roll...

Page 61: ... drive system Moderate amount of GEP to the sliding surfaces of the idle pulley and idle pulley shaft Apply a small amount of GEP to the sliding surface of the change gear Apply a small amount of GEP to the release lever surface that slides on the shaft Release lever ...

Page 62: ...L Apply a small amount of GEP to the shaft sliding surfaces Apply a small amount of GEP to the gear tooth surfaces Apply a small amount of GEP to the gear tooth surfaces Apply a small amount of GEP to the sliding surface of the release lever ...

Page 63: ...DENTIAL 2 Adjustment lever Adjustment lever Moderate amount of GEP to the sliding surface of the detent Moderate amount of GEP to the surface that slides on the SW lever Moderate amount of GEP to the surfaces that slide on side frame R ...

Page 64: ...ractor frame R Sprocket wheel Apply a small amount of GEP to the gear tooth surfaces Apply a small amount of GEP to the sliding surfaces of the tractor frame L and the sprocket wheel Apply a small amount of GEP to the surface that slides along the tractor shaft Sprocket wheel Tractor frame L Locking lever Locking lever Tractor frame L Tractor frame R Apply a small amount of GEP to the sliding surf...

Page 65: ... pull up roller frame and the pull up roller shaft Pull up roller Pull up frame Apply a small amount of GEP to the sliding surfaces of the pull up roller frame and the pull up roller shaft 5 Carriage shaft Moderate amourt of PM to the sliding surface of the carriage frame and the carriage shaft After the lubrication of oil slide the carriage to coat the carriage shaft with oil ...

Page 66: ...t Functions SEL ALARM STATUS 1 STATUS 2 Green Red Green Green Indicates SELECT ready to receive status Indicates power saving status lit dim Indicates paper end status Indicates the font character pitch and print mode Indicates the font character pitch and print mode Indicates DESELECT state not ready to receive Indicates existence of no alarms Indicates the font character pitch and print mode Ind...

Page 67: ...MARK O X O X O X X X O X X X X 1 Meanings of symbols O Stays lit X Stays off Flashes No symbol Previous status 2 The flash cycle time of LED is 400ms In power saving mode the LED alternately illuminates for 400ms then turn off for 1200ms 3 Every LED lights up immediately after power on of the printer and lights out after RAM checking SEL LED and STATUS LED are displayed when SELECT DESELECT is det...

Page 68: ...The flash cycle time of LED is 400ms 2 Fatal alarms Details of fatal alarm are listed in the table below and the number of flashes of SEL LED and ALARM LED represents alarm status Alarm status indication consists of combinations of main flash and sub flash Both SEL LED and ALARM LED flash simultaneously in main flash and only SEL LED flashes in sub flash Alarm indication No of main flashes 1 2 3 4...

Page 69: ...ed and an alarm is indicated abnormality The movement of the carriage is abnormal runs out of control 7 vibrates stops during homing etc and an alarm is indicated Paper feed abnormality Paper end is generated even when paper is set Lamp B 8 goes on Paper end does not generate even in paper end condition Lamp B goes off Line is not fed upon receiving printing data 9 Ink ribbon feed abnormality Prin...

Page 70: ...he LF Motor Cable broken Y Replace the LF Motor N Is the SP Motor Cable broken Y Replace the SP Motor N Is the voltage in the table bellow being out put to the connector POW for the Pow Unit Y Is the power cord connected properly N Reconnect the cord properly Y Replace the Pow Unit 1 Connector CN1 Pin No 1 2 12 15 4 5 11 6 10 7 9 Voltage 35V 0V logic type 5V 0V drive type The carriage does not mov...

Page 71: ...d N Is the SP motor cord connected properly N Connect the cord properly Y Turn OFF the power remove the SP motor connection and confirm that the resistance between pins 1 2 and 3 4 of the SP motor connector SPMOT is approximately 4 2Ω 10 N Replace the space motor Y Replace the L09 print circuit board 6 Some switches do not function or functions continuously Is the operator panel connector OP cord ...

Page 72: ...en pins 1 2 and 3 4 of SPMOT connection on the L09 print circuit board is approximately 4 2Ω 10 N Replace the space motor Y Replace the L09 print circuit board 7 Paper end is generated even when paper is set Lamp B goes on Paper end does not generate even in paper end condition Lamp B goes off 1 When using cut sheets Set to menu mode and perform menu print If PE detect is set to OFF reset to ON an...

Page 73: ...bbon cartridge Y Has the ink ribbon reached its life Y Replace the ribbon cartridge N Is the head gap set at the regulated value N Readjust the head gap Y Replace the print head 9 0 Line is not fed upon receiving printing data Is the LF motor cord connected properly N Connect the cord properly Y Turn OFF the power remove the LF motor connector and confirm that the resistance between pins 1 2 and 3...

Page 74: ...N End the procedure Y Are the sections between the L09 print circuit board HD1 head cable carriage print head connected properly N Reinstall properly Y Replace the L09 print circuit board A B Space movement is normal but print is not performed Is print disabled even after replacing the print head N End the procedure Y Are the sections between the L09 print circuit board HD1 head cable carriage pri...

Page 75: ... Replace the L09 print circuit board Y Are parallel data CENT 2 pin 9 pin and STB N CENT 1 pin sent from the Host N Replace the interface cable Y Replace the L09 print circuit board C Upon receiving printing data Wrong characters are printed Some characters are missing Lamp A is illuminating Is the interface cable connected properly N Connect the cable properly Y Is a self test print performed pro...

Page 76: ... the PCB yet 1 Remove the two screws on the left and the right that hold the upper cover in place 2 Check the ROM socket position on the board 7 2 Creating EPROM for rewriting flash memory and installing it Create the ROM by burning the F W to be downloaded into the following EPROM EPROM 16Mbit EPROM M27C160 100F1 ROM number 8154620L0002 1Pin ROM socket position ...

Page 77: ... the LED indication work state 4 Confirm the STEP 7 FLASH rewrite complete state and turn the printer off This com pletes the operation NOTICE DONOT POWER OFF WHILE REWITING THE FLASH ROM Possible to no work the printer if power off the printer while download the F W In this case have to change the flash ROM chip Meaning of the LED indications O OFF Light up Blinking ON 200ms and OFF 200ms cycle L...

Page 78: ...teps again however there s a possibility for the same error to occur fatal error alarm ALARM Main 1 2 STATUS 5 5 5 5 2 3 4 5 OFF OFF OFF OFF Flash ROM Signature error Flash loading hash error Flash loading data write error Write data and read do not match Polling error Flash sector erase or Entire flash erase included OFF OFF OFF OFF Contents of error STATUS SEL Sub 7 4 Initial condition Do not in...

Page 79: ...DENTIAL 8 PARTS REPLACED PERIODICALLY The following parts must be replaced at determined intervals Name 1 2 Idle pulley Ribbon Protector Assy Replacement intervals Actual operating hours in H Part number 43473801 43514501 No 1000H 1000H ...

Page 80: ...43471801TH Rev 1 80 Oki Data CONFIDENTIAL APPENDIX A PCB LAYOUT PCB List 1 Circuit board L09 Main Controller 2 Circuit board LSO Operator Panel ...

Page 81: ...SPDV F3 15 1 2 14 POW IC5 10 1 RSIF C18 USB 2 3 RM18 R60 R62 36 1 19 CENT 1 FROM 1 1 1 SENSOR3 C17 CENDV DRAM 52 53 104 105 OSC3 156 157 IC6 IC4 40 TH1 CP5 25 24 REG 80 65 64 41 1 LSI SENSOR1 SENSOR2 7 1 1 3 6 ROM 13 OP 2 2 12 HD1 15 16 LFDV LFMOT L09 Printed Circuit Board LED4 LED3 SW4 SW3 SW2 SW1 LED2 LED1 13 1 14 2 CN1 ...

Page 82: ...Symbols Symbol Mark Description Q Q OSC TR SCR D D D REG C C R SW S CN SN74LS05 inverter open collector SN7406 inverter open collector Ceramic oscillator Transistor Thyristor Diode Zener diode Light emitting diode Regulator Capacitor Electrolytic capacitor Resistor Switch Jumper wire or plug Connector terminal Means a single part S D Reference ...

Page 83: ...43471801TH Rev 1 83 83 Oki Data CONFIDENTIAL Symbol Mark Description FG L Q THERMISTOR SG TF F Frame ground Dot head element Coil 339 Comparator Thermistor Signal ground Transformer Photo sensor Fuse F ...

Search results

Summary of Contents for ML1120

Reviews:

Brands by name

Popular brands

OKIDATA ML1120, Maintenance Manual

Search results

Summary of Contents for ML1120

Reviews:

Brands by name

Popular brands