OKIDATA ML172 Series Service Manual Download

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Summary of Contents for ML172 Series

Page 1: ...Thank You for purchasing this Factory Service Manual on EBAY from PCTECHINFO Click Here for more Factory Service Manuals for other Computer and Printer Copier Manufacturers from PCTECHINFO...

Page 2: ...pictures rendered at 300 dpi which is ideal for printing but does not view on most displays well Okidata is a registered trademark and OkiPage is a trademark of Oki Electric Industry Co Ltd HP LaserJ...

Page 3: ...2 2 3 Space Mechanism Operation 16 2 2 4 Ribbon Feed Mechanism Operation 17 2 2 5 Paper Feed Mechanism Operation 18 2 2 6 Paper end Detection Mechanism 19 2 2 7 Semi Automatic Sheet Feed SASF 20 3 Pr...

Page 4: ...Points for Printed Circuit Boards ML182Plus and ML182Turbo 57 RAP 1 Power is on but carriage does not move 58 RAP 2 Power LED lights but the carriage does not move 59 RAP 3 Carriage movement is abnorm...

Page 5: ...ion 73 A PCB Referance Charts Power Supply Board SLPB 74 ML172 Control Board SLMR 51 SLMR 52 and Operator Board 75 ML182 Control Board SLMC 76 ML182 Control Board SLMR and Operator Board 77 ML182 PLUS...

Page 6: ...assume responsibility for errors beyond our control Copyright 1989 by OKIDATA First Edition May 1989 CENTRONICS is a registered trademark of Centronics Inc EPSON is a registered trademark of Seiko Ep...

Page 7: ...ers using a 9 wire printhead These printers use a re inking cartridge ribbon Although these printers are similar in appearance there are differences in the features that each printer offers Lets take...

Page 8: ...ault values when the printer is powered off Pull tractor is standard Available in two models 1 Centronics parallel interface this model will not accept a serial board 2 RS232 D serial interface This m...

Page 9: ...ilable with two interfaces Centronics Parallel or RS232 C Serial 9600 Baud Ready Busy Protocol An optional Super Speed Serial board 19 2 Baud Ready Busy and X On X Off Protocols is available Copyright...

Page 10: ...nel which allow the setting of Pitch 10 12 or 17 CPI and Mode Near Letter Quality Utility and High Speed Draft SASF Semi Automatic Sheet Feed which allows single sheets of paper to be automatically lo...

Page 11: ...ML182 PLUS but does not provide SASF capability Print speed at 10 CPI is 155 CPS in Utility mode and 186 CPS in HSD mode Super Speed Draft at 232 CPS is available at 12 CPI Copyright 1997 Okidata Div...

Page 12: ...illion characters 1 2 4 Line Feed Selection 6 lpi 167 inch 8 lpi 125 inch n 72 inch n 144 inch Microline emulation n 216 inch IBM emulation NOTE Refer to your Printer Handbook for applicability to you...

Page 13: ...b assembly level 1 2 9 Available Options Tractor Feed Assembly 1 Super speed Serial Interface RS232 C Roll Paper Stand 1 Standard on the ML172 2 Not available for ML172 Copyright 1997 Okidata Division...

Page 14: ...2 1 ELECTRICAL PRINCIPLES OF OPERATION The printers major electrical assemblies are shown in Figure 2 1 Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business...

Page 15: ...es a 1 amp fuse for over current protection This circuit board transforms the AC input voltage into 7 6 VAC 24 VAC and 10 VAC for use on the Control PCB The Transformer contains a thermal fuse for pro...

Page 16: ...M Spacemotor drive circuit alarm LFALM Linefeed motor drive circuit alarm When any of the above signals become active the Driver Fault Alarm Circuit will output the ALM signal This signal then turns O...

Page 17: ...ore than a BUS used to connect the printhead operator panel spacemotor linefeed motor and semi automatic sheet feeder SASF Switch ML182 PLUS only to the Control PCB Copyright 1997 Okidata Division of...

Page 18: ...he ML172 and ML182 use the same type Operator Board SLSQ while the ML182 PLUS and ML182 TURBO use the same type Operator Board SLSX For specific information on the capabilities and use of each of thes...

Page 19: ...angle There is also a coiled wire wrapped around each of the nine permanent magnets When a dot is to be printed current passes through the coiled wire creating a magnetic field which counters the mag...

Page 21: ...adjusting lever is operated the adjusting screw which is interlocked with the lever via a gear rotates and changes the position of the carriage frame around the carriage shaft The printhead mounted v...

Page 22: ...k Sensor Encoder Disk Slider SPACING OPERATION The Carriage Frame with the Printhead and Spacemotor mounted on it moves parallel to the platen along the Carriage Shaft As the Spacemotor rotates counte...

Page 24: ...bon cartridge RIBBON CARTRIDGE A uni directional feed continuous ribbon is used The ribbon is replenished by a built in ink tank in the ribbon cartridge so that quality printing is assured RIBBON FEED...

Page 26: ...t drives the platen via the reduction gear If the optional tractor unit is installed platen rotation is also transmitted through the idle gear to the tractor unit The paper feed mechanism is designed...

Page 27: ...s clockwise so that the pressure rollers are pushed against the platen by the front and rear pressure levers allowing paper to be fed Copyright 1997 Okidata Division of OKI America Inc All rights rese...

Page 28: ...d of the remaining paper is about 1 inch 25 4 mm from the printhead position BOTTOM PAPER FEED When paper is installed in the printer it prevents the bottom near end lever from falling into the hole i...

Page 30: ...be ON indicating that a PAPER OUT condition exists Pull the Bail Arm toward the front of the printer The Bail Arm will contact the SASF Switch which is mounted on the Interconnect Board causing it to...

Page 31: ...he outlet and the printer 1 Do not remove any parts unless instructed to do so 2 Do not place the printed circuit boards on conductive surfaces 3 When disassembling the printer temporarily replace scr...

Page 32: ...182 Series Chapter 3 Printer Maintenance Figure 3 1a ML172 Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this...

Page 33: ...182 Series Chapter 3 Printer Maintenance Figure 3 1b ML182 Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this...

Page 34: ...es Chapter 3 Printer Maintenance Figure 3 1c ML182 PLUS ML182 TURBO Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates...

Page 35: ...s Unless the validity of the procedure will be effected the drawings will depict an ML182 PLUS When differences exist between the printers they will be documented within the applicable procedure and a...

Page 36: ...t shown if installed 3 Remove the tractor feed unit 2 by depressing the lock levers 3 and tilting toward the rear of the printer if installed 4 Detach the access cover 4 by lifting the rear edge 5 Rem...

Page 38: ...ach side of the interface connector 2b Remove the serial interface board by lifting 3 Remove the transformer connector 1 from the control board 2 4 Remove the five control board mounting screws 3 If a...

Page 39: ...applies to older ML182 s only 2 Make sure the paper near end lever moves freely in the groove of the Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Pa...

Page 40: ...ntrol board 2 3 Remove the ground strap mounting screw 3 4 Remove the two transformer mounting screws 4 5 Remove the transformer assembly 5 along with the power supply board 6 and AC receptacle 7 by l...

Page 41: ...ssembly 3 2 3 3 Detach the power supply board 1 from the transformer 2 by pulling from the connection pins 3 CAUTION When reassembling place the Power Supply Board inside the guide 4 Copyright 1997 Ok...

Page 42: ...2a ML172 and ML182 Disengage the two mounting tabs 1 2b ML182 PLUS ML182 TURBO While pulling the side plates 1 outward lift the operator panel slightly 3 Remove the connector 2 from the interconnect...

Page 44: ...r 1 by lifting the rear edge 2 Remove the ribbon cartridge 2 by grasping the sides and lifting 3 Raise the head clamp 3 by swinging the right tab upward 4 Remove the printhead 4 by lifting Copyright 1...

Page 45: ...e the ribbon cartridge 1 by grasping the sides and lifting 3 Disengage the two front tabs 2 and the two rear tabs 4 Slowly lift the ribbon feed gear assembly 3 being careful not to separate the upper...

Page 46: ...he PRINTHEAD GAP ADJUSTMENT See your printer handbook for instructions 3 4 1 Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for an...

Page 47: ...tach the connector 1 and observe the position of the concave surface 5 Remove the three mounting screws 2 6 Remove the space motor 3 from the printer NOTE After replacing this assembly you must perfor...

Page 48: ...2 from the base plate 7 Remove the space rack 3 by inserting a small screwdriver between the space rack and the base frame and gently pry the space rack upward 4 NOTE After replacing the space motor...

Page 49: ...1 Remove the upper cover 3 2 1 2 Remove the printhead 3 2 6 3 Remove the ribbon feed gear assembly 3 2 7 4 Remove the space motor assembly 3 2 8 5 Remove the space rack 3 2 9 6 Unlock the two tabs 1 a...

Page 50: ...erform the PRINTHEAD GAP ADJUSTMENT See your printer handbook for instructions 3 4 1 Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BP...

Page 51: ...anism 1 Remove the upper cover 3 2 1 2 Detach the transformer connector 1 from the control board 2 3 Remove the transformer ground strap mounting screw 3 4 Detach the operation panel 3 2 5 5 Remove th...

Page 53: ...ssembly 1 Remove the printer mechanism 3 2 11 2 Remove the two LF motor mounting screws 1 3 Detach the LF motor assembly 2 Copyright 1997 Okidata Division of OKI America Inc All rights reserved See th...

Page 54: ...er 3 2 1 2 Remove the two springs 1 3 Remove the two shafts 2 by compressing the exposed shaft pin and push out 3 4 Detach the column indicator bar 4 Copyright 1997 Okidata Division of OKI America Inc...

Page 55: ...The ML172 does not have pins on the Platen Assembly A Tractor Assembly is standard To eliminate backlash between the line feed motor gear 4 and the line feed drive gear 5 rotate the bias gear 6 slight...

Page 56: ...e printer mechanism 3 2 11 2 Move the carriage 1 to the right side of the printer mechanism 3 Remove the four mounting screws 2 4 Unlock the two tabs 3 and remove the carriage cable clamp 4 5 Detach t...

Page 58: ...ws open detach the paper lock release lever 2 4 Disengage the middle release link 3 from the rear release link 4 and remove the rear release link 5 Remove the four mounting screws 5 6 Detach the paper...

Page 59: ...and detach the near end lever assembly 2 3 Close the claws 3 and remove the front release link 4 and the middle release link 5 4 Remove the two mounting screws 6 5 Remove the bottom paper guide assem...

Page 60: ...he mounting screw 1 and detach the near end lever assembly 2 NOTE The near end lever without the bracket can be removed by first removing the control board then pulling the lever upward Copyright 1997...

Page 61: ...19 Bottom Near end Lever 1 Remove the paper chute assembly 3 2 16 2 Detach the bottom near end lever 3 Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business...

Page 62: ...e rear 6 Insert a 0 019 inch thickness gauge between the platen and the printhead Make sure that the thickness gauge can be smoothly inserted although a small amount of friction is acceptable 7 If adj...

Page 64: ...gauge between the Space Rack and the Roller Make sure that the thickness gauge can be smoothly inserted although a small amount of friction is acceptable 5 If adjustment is required loosen the three s...

Page 66: ...LF TESTS NOTE Please refer to the appropriate Printer Handbook for instructions on running the printer self tests Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA...

Page 67: ...cleaner if available Parts to be cleaned SEE TABLE LISTED BELOW 3 5 2 Printer Lubrication The ML172 ML182 ML182 PLUS and ML182 TURBO printers do not require lubrication during normal operation Lubric...

Page 69: ...peed Serial Interface Board 9600 BAUD maximum This board supports READY BUSY Protocol only NOTE 2 The ML182 TURBO Microline Serial configurations shipped from OKIDATA will contain a Super Speed Serial...

Page 70: ...alysis Procedures or RAPs RAPs will ask the technician questions regarding printer operation electrical measurements The answers to these questions will determine the technicians next course of action...

Page 71: ...182 Series Chapter 5 Failure Analysis Procedures Rap Index Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this...

Page 72: ...5 Failure Analysis Procedures Board layout and Wiring ML182Plus and ML182Turbo Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for...

Page 73: ...ter 5 Failure Analysis Procedures Board layout and Wiring ML172 and ML182 Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any u...

Page 74: ...ies Chapter 5 Failure Analysis Procedures Pin Numbers and Signals Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates t...

Page 75: ...er 5 Failure Analysis Procedures Check Points for Printed Circut Boards 172 Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any...

Page 76: ...5 Failure Analysis Procedures Check Points for Printed Circuit Boards ML182 Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for an...

Page 77: ...e Analysis Procedures Check Points for Printed Circuit Boards ML182Plus and ML182Turbo Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange...

Page 78: ...r 5 Failure Analysis Procedures Rap 1 Power is on but carriage does not move Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for an...

Page 79: ...ailure Analysis Procedures Rap 2 Power LED lights but the carriage does not move Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX fo...

Page 80: ...Page 60 Service Guide ML172 ML182 Series Chapter 5 Failure Analysis Procedures Rap 3 Carriage movement is abnormal when power is turned on...

Page 82: ...Page 61 Service Guide ML172 ML182 Series Chapter 5 Failure Analysis Procedures Rap 4 Homing operation is normal but the indicators LED1 to LED9 are abnormal when power is turned on...

Page 84: ...nalysis Procedures Rap 5 Fuse F1 on power supply board SLPB blows when power is turned on Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchan...

Page 85: ...e Analysis Procedures Rap 6 Fuse F1 on the control board blows when power is turned on Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange...

Page 86: ...Analysis Procedures Rap 7 Neither spacing nor printing performed while receiving data Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange...

Page 87: ...Analysis Procedures Rap 8 Spacing is normal but nothing is printed while receiving data Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange...

Page 88: ...s Chapter 5 Failure Analysis Procedures Rap 9 Printer stops printing Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any update...

Page 89: ...Analysis Procedures Rap 10 Wrong characters are printed or some characters are missing Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange...

Page 90: ...s Chapter 5 Failure Analysis Procedures Rap 11 Some dots are missing Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any update...

Page 91: ...ries Chapter 5 Failure Analysis Procedures Rap 12 Print is light Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to...

Page 92: ...hapter 5 Failure Analysis Procedures Rap 13 Line feed is not performed Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any upda...

Page 93: ...ysis Procedures Rap 14 Fuse F1 on power supply board blows while receiving data and printing Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exc...

Page 94: ...Rap 15 Switch on the operator panel does not work Carriage returns to home position when power is turned on Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Busin...

Page 95: ...r 5 Failure Analysis Procedures Rap 16 Paper not fed properly SASF function Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any...

Page 96: ...Referance Charts Power Supply Board SLPB Fuses F1 1 amp Switches NONE Jumpers NONE Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX...

Page 97: ...tor Board Fuses F1 1 5 amp Switches 1 Switch Bank with 8 Switches NOTE Please refer to the appropriate Users Manual for switch definitions Jumpers Copyright 1997 Okidata Division of OKI America Inc Al...

Page 98: ...lease refer to the appropriate Users Manual for switch definitions Jumpers NOTE Please refer to the ML182 Maintenance Manual for jumper plug settings for your Control Boards revision level Copyright 1...

Page 99: ...es NOTE Please refer to the appropriate Users Manual for switch definitions Jumpers NOTE Please refer to the ML182 Maintenance Manual for jumper plug settings for your Control Boards revision level Co...

Page 100: ...L182 TURBO Control Board SLMX and Operator Boards Fuses F1 1 5 amp Switches 1 Switch Bank with 8 Switches NOTE Please refer to the appropriate Users Manual for switch definitions Jumpers Note Please r...

Page 102: ...with 8 Switches on each NOTE Please refer to the appropriate Users Manual for switch definitions Jumpers NOTE Refer to Technical Information Bulletin 147 for Jumper Settings Copyright 1997 Okidata Div...

Page 103: ...Page 80 Service Guide ML172 ML182 Series Chapter B Parts Compatability Chart Parts Compatability Chart...

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