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Oki ML420 Series User Manual

Manual is about: High Performance 10/100 Base-T Ethernet Network Print Server

Summary of ML420 Series

  • Page 1

    User’s guide 59348301.

  • Page 2

    2 ml 420/421 user’s guide p/n 59348301, revision 1.2 february, 2006 every effort has been made to ensure that the information in this document is complete, accurate, and up-to-date. Oki data assumes no responsibility for the results of errors beyond its control. Oki data also cannot guarantee that c...

  • Page 3: Safety

    3 safety your oki printer has been carefully designed to give you years of safe, reliable performance. As with all electrical equipment, there are a few basic precautions you should take to avoid hurting yourself or damaging the printer: • carefully read all setup and operating instructions. Be sure...

  • Page 4

    4 microline 420/421 user’s guide • unplug the printer before you clean it. Use only a damp cloth. Do not use liquid or aerosol cleaners. • to protect your printer from overheating, make sure no openings on the printer are blocked. Do not put the printer on or near a heat source, such as a radiator o...

  • Page 5: Contents

    5 contents safety............................................................................ 3 chapter 1: introduction ............................................. 7 printer features ............................................................................... 7 chapter 2: helpful hints ...........

  • Page 6

    6 microline 420/421 user’s guide chapter 4: menu mode ............................................ 25 menu mode keys ....................................................................... 25 entering and exiting menu mode ............................................. 26 resetting the menu to the fa...

  • Page 7: Chapter 1: Introduction

    7 chapter 1: introduction oki data on the internet the oki data web sites provide the most current information available on your printer. On-line documents are available for viewing and downloading via oki data’s web sites. You may reach oki data via the internet at: • www.Okidata.Com • my.Okidata.C...

  • Page 8: Chapter 2: Helpful Hints

    8 chapter 2: helpful hints saving time internet support oki data provides support via the internet: • www.Okidata.Com is the main web site, the gateway to oki data’s products and services. • http://my.Okidata.Com is a powerful area of oki data’s web site designed to help you personalize the informat...

  • Page 9: Operation Tips

    Helpful hints 9 operation tips top of form (tof) top of form (tof) sets the print start position. The factory default is 1" from the top. The top of form can be changed in increments of 1/180", either for a single print job or set to a new default. The overall amount of adjustment is limited to avoi...

  • Page 10: (Continuous Forms)

    10 note: for rear feed, the paper lever must be forward. Chapter 3: using your printer parts identification: rear feed (continuous forms) note: the serial number of your printer is on a label on the back, beside “s/n.” sheet guide paper lever on-off switch platen knob control panel acoustic cover ac...

  • Page 11: (Single Sheets)

    Using your printer 11 parts identification: top feed (single sheets) paper guides sheet guide paper lever on-off switch platen knob control panel acoustic cover (open) note: for single-sheet printing, the paper lever must be in the middle position..

  • Page 12: Top of Form (Tof)

    12 microline 420/421 user’s guide top of form (tof) important! If you turn the platen knob when the printer is on, the top of form misaligns. Always shut the printer off before turning the platen knob! Note: the factory default setting for the top of form (where the printing should begin) is 1" down...

  • Page 13

    Using your printer 13 determining if forms tear-off is off or on there are two ways to determine the status of the forms tear-off menu setting: • print the menu. • use the tear key. To print the menu: 1 make sure paper is loaded. 2 hold shift (2), then press sel (1) to enter the menu mode. 3 press p...

  • Page 14

    14 microline 420/421 user’s guide setting top of form (tof): forms tear-off off (default setting) important! If you turn the platen knob when the printer is on, the top of form misaligns. Always turn the printer off before turning the platen knob! Note: the first line prints at the red line (1) of t...

  • Page 15

    Using your printer 15 setting top of form (tof): forms tear-off set to on important! If you turn the platen knob when the printer is on, the top of form misaligns. Always turn the printer off before turning the platen knob! Note: the first line prints at the red line (1) of the plastic paper shield ...

  • Page 16

    16 microline 420/421 user’s guide temporarily changing the top of form position important do not use the platen knob to change the top of form. If you turn the platen knob when the printer is turned on, the top of form misaligns. Always turn the printer off before turning the platen knob! To move th...

  • Page 17: Forms Tear-Off Feature

    Using your printer 17 forms tear-off feature note: this feature is normally turned off. To use forms tear-off, you must enter the menu and change the setting to the desired time interval (see next page). The forms tear-off feature allows a printed continuous forms page to be torn off without wasting...

  • Page 18: Paper Park

    18 microline 420/421 user’s guide changing the forms tear-off setting note: the default setting for forms tear-off is off. To change the forms tear-off setting: 1 press shift (2) + sel (1). 2 press group (3) repeatedly until the rear feed or bottom feed group shows in the first column of the printed...

  • Page 19: Changing Paper Paths

    Using your printer 19 changing paper paths continuous forms to single sheets 1 tear off any printed pages, then press park . 2 raise the sheet guide (1) to the single-sheet feed position. 3 pivot the wire feed guide into the sheet guide. 4 move the paper lever (1) to the middle position marked “top....

  • Page 20

    20 microline 420/421 user’s guide 4 move the paper lever to the appropriate position. • rear feed: • bottom feed: 5 if necessary, load continuous-form paper. 6 press ff/load . Single sheets to continuous forms 1 press ff/load to remove the single-sheet paper. 2 lower the sheet guide into the continu...

  • Page 21: Printhead Gap

    Using your printer 21 to adjust the gap, open the access cover and move the blue lever (1) to the recommended setting from the table. Setting media 1 regular paper 2 2-part form (with carbon) 3 3-part form (with carbon) 4 4-part form (with carbon) 5 envelopes or extra thick paper note: when the head...

  • Page 22: Print Quality

    22 microline 420/421 user’s guide print quality important! Front panel settings for print quality and character pitch are normally overridden by software commands. Press print quality (1) to select: utl: utility—the default • medium quality, medium speed (380 cps) • gothic typeface only hsd: high sp...

  • Page 23: Character Pitch

    Using your printer 23 epson and ibm emulations set the character pitch by pressing character pitch (1) until the light beneath the desired setting is lit: • 10 cpi • 12 cpi • 15 cpi • 17 cpi • 20 cpi • proportional microline emulation in the microline emulation, the character pitch choices are: • 10...

  • Page 24: Printer Reset

    24 microline 420/421 user’s guide printer reset clearing some error conditions requires that you reset (reinitialize) the printer. To do this: 1 press and release sel (1) to take the printer off-line. The sel light goes out. 2 press and hold shift (2), then press the reset / character pitch key. Imp...

  • Page 25: Chapter 4: Menu Mode

    25 chapter 4: menu mode group key prints the next group in the menu. With the shift key, prints the previous group. Item key prints the next item in the group. With the shift key, prints the previous item in the group. Set key prints the next setting for an item. With the shift key, prints the previ...

  • Page 26

    26 microline 420/421user’s guide entering and exiting menu mode to enter or exit the menu mode, hold shift while pressing sel . Resetting the menu to the factory defaults note: please print the current menu mode settings before you reset or change them. This is the only way to have a record of the s...

  • Page 27

    Mode menu 27 changing the menu settings note: please print the current menu mode settings before you reset or change them. This is the only way to have a record of the settings. 1 press and hold shift , then press sel to enter the menu mode. 2 use the group , item and set keys to make your changes: ...

  • Page 28

    28 microline 420/421user’s guide menu settings table for a complete explanation of each menu item, see “explanations of menu items” later in this chapter. The table below shows the items which may appear in the menu. Settings which are engaged at the factory (defaults) are set in bold italic. Some g...

  • Page 29

    Mode menu 29 menu settings table (continued) group item settings (defaults are set in bold italic) rear feed line spacing 6 lpi, 8 lpi form tear-off off, 500 ms, 1 sec, 2 sec skip over perforation no, yes page width (wide model) 13.6", 8" page length 11", 11-2/3", 12", 14", 17", 5", 3", 3.5", 4", 5....

  • Page 30

    30 microline 420/421user’s guide menu settings table (continued) group item settings (defaults are set in bold italic) top feed line spacing 6 lpi, 8 lpi form tear-off* off, 500 ms, 1 sec, 2 sec bottom margin valid, invalid page width (wide model) 8", 13.6" page length 11", 11-2/3", 12", 14", 17", 5...

  • Page 31

    Mode menu 31 menu settings table (continued) group item settings (defaults are set in bold italic) setup (cont..) print registration 1 0, range to 0.25 mmm to the right or left, set in 0.05 mm increments • press sel to shift registration to the left; • press shift + sel to shift registration to the ...

  • Page 32

    32 microline 420/421user’s guide menu settings table (continued) group item settings (defaults are set in bold italic) si select pitch (10 cpi)* 15 cpi, 17.1 cpi si select pitch (12 cpi)* 12 cpi, 20 cpi time out print valid, invalid auto select no, yes centering position default, mode 1, mode 2 csf ...

  • Page 33

    Mode menu 33 menu settings table (continued) group item settings (defaults are set in bold italic) serial if* parity none, odd, even serial data 7/8 bits 8 bits, 7 bits protocol ready/busy, x/on / x/off diagnostic test no, yes busy line ssd-, ssd+, dtr, rts baud rate 19200 bps, 9600 bps, 4800 bps, 2...

  • Page 34

    34 microline 420/421user’s guide menu settings table (continued) group item settings (defaults are set in bold italic) csf bin 1* line spacing 6 lpi, 8 lpi bottom margin valid, invalid page width (wide model) 8", 13.6" page length 11", 11-2/3", 12", 14", 17", 5", 3.5", 4", 5.5", 6", 7", 8", 8.5" csf...

  • Page 35

    Mode menu 35 explanations of menu items these explanations are in alphabetical sequence to make it easier to look them up. Some items only appear when optional accessories are installed; others appear in several groups in the menu. 7 or 8 bit graphics, default = 7 change this setting to 8 if your sy...

  • Page 36

    36 microline 420/421user’s guide bottom margin, default = valid change to invalid if you want the printer to ignore the bottom margin setting. Caution!! Setting the bottom margin to invalid can cause loss of data and damage the printhead by allowing printing without paper. Busy line, default = ssd- ...

  • Page 37

    Mode menu 37 csf type, default = wide to avoid paper jams, change this setting to narrow if you are using the optional cut sheet feeder on the wide model ml421 printer. Diagnostic test, default = no appears only when the optional serial interface is installed. Select yes to perform a diagnostic test...

  • Page 38

    38 microline 420/421user’s guide i-prime, default = buffer print determines what the printer will do when it receives the i-prime signal from the software. • buffer print: prints out the buffer contents before resetting. • buffer clear: dumps the buffer contents immediately. • invalid: causes the pr...

  • Page 39

    Mode menu 39 page width, default = depends on feed path wide carriage model only. For rear and bottom paths, the default is 13.6". Change to 8" if you will be printing on narrow paper. This prevents printing on the platen which can damage the printhead and the platen, and can cause loss of data. For...

  • Page 40

    40 microline 420/421user’s guide print mode, default = utility choose the quality and typeface of printing. Switch to nlq courier or nlq gothic for near letter quality printing. If you are printing draft-type documents, select draft, then select either hsd or ssd under draft mode. Both of these item...

  • Page 41

    Mode menu 41 si select pitch 12 cpi, default = 20 cpi ibm emulation only. Sets the pitch to be engaged when the printer control panel is set for 12 cpi and the si command is received. Size, default = single change to double for double width and height printing. Skip over perforation, default = no ch...

  • Page 42: Chapter 5: Maintenance

    42 1 make sure the printer is turned off. 2 open the access cover and center the printhead. Chapter 5: maintenance replacing the ribbon cartridge important! Make sure you have the correct replacement ribbon for the your printer. The wrong ribbon will not print when installed in your printer. Look fo...

  • Page 43

    Maintenance 43 caution! The printhead may be hot! 3 swing the used ribbon cartridge up off the printhead, lift it out, and discard it. 4 unpack the new ribbon cartridge and install it. Important! Do not remove the ribbon shield (1) from the ribbon! 5 turn the take-up knob (1) in the direction of the...

  • Page 44: Loading Paper

    44 microline 420/421 user’s guide loading rear feed paper from the back of the printer note: these instructions assume you have ready access to the back of the printer. If you do not, skip down to “loading rear feed paper from the front of the printer.” 1 make sure the paper lever is forward (positi...

  • Page 45

    Maintenance 45 4 pivot the sheet guide forward and gently rest it against the roller assembly. Careful! If you push the sheet guide too hard against the roller assembly, it may dislodge it. If it does, be sure to reseat the roller assembly before continuing. 3 grasp the sheet guide. Lift it slightly...

  • Page 46

    46 microline 420/421 user’s guide 6 open the lock levers (1) and move the right tractor (as viewed from the back of the printer) to the reference mark (2) matching the width of the paper you are loading. Then close the lock lever on the right tractor: note: the movement of the right tractor is limit...

  • Page 47

    Maintenance 47 8 place continuous forms paper on the first two pins of either tractor. Important! You must keep the number of paper holes engaged on either pin the same. If you don’t the paper will skew and jam. 9 close the right tractor cover. 10 adjust the left tractor until the holes in the paper...

  • Page 48

    48 microline 420/421 user’s guide 11 lower the sheet guide and slide it toward the front of the printer until the marks align. 12 place the wire guide (“1” in the illustration for the step above) in the sheet guide on the pull-up roller assembly. 13 press ff/load . Note: the factory default setting ...

  • Page 49

    Maintenance 49 loading rear feed paper from the front of the printer note: these instructions assume you do not have ready access to the back of the printer. If you do, go back to “loading rear feed paper from the rear of the printer” earlier in this chapter. Lock lever upper tractor cover pins 1 ma...

  • Page 50

    50 microline 420/421 user’s guide note: the movement of the left tractor (as viewed from the front of the printer) is restricted to ensure that the paper covers the paper out sensor. 5 you will find reference marks (1 in illustration below) on the printer for the two most common paper sizes: ml420: ...

  • Page 51

    Maintenance 51 8 adjust the position of the right tractor to center the holes in the paper on the pins. Then, close its tractor cover and push back the lock lever. Do not stretch the paper. Note: if the paper is too loose or too tight it can cause jams. 9 reinstall the sheet guide..

  • Page 52

    52 microline 420/421 user’s guide 10 place the wire guide (1) in the sheet guide on the pull-up roller assembly. 11 press ff/load . Note: the factory default setting for the top of form (where the printing should begin) is 1" down from the top of the page. To change the setting, see “top of form (to...

  • Page 53

    Maintenance 53 3 open the acoustic cover (1) and raise the sheet guide to the single-sheet position. Pivot the wire feed guide (2) up into the sheet guide. Top feed (single sheets) note: if you have continuous form paper in the path, press park to remove it before loading single sheets. 1 make sure ...

  • Page 54

    54 microline 420/421 user’s guide 4 adjust the paper feed guides (1) for the width of the paper, then place a sheet of paper in the separator. The paper will feed into the printer. Important! If the paper does not feed in, remove it. Check the paper lever position. Make sure the alarm light is on: i...

  • Page 55: Clearing Paper Jams

    Maintenance 55 clearing paper jams rear-feed paper jams 1 turn off the printer. 2 use the platen knob to back the paper all the way out of the printer. Caution! Make sure the printer is turned off before you open the access cover. 3 open the access cover (1) and remove the pull-up roller assembly (2...

  • Page 56

    56 microline 420/421 user’s guide bits of paper stuck in the paper path 1 turn off the printer. 2 use the platen knob to back the paper all the way out of the printer. Caution! Make sure the printer is turned off before you open the access cover. 3 open the access cover (1) and remove the pull up ro...

  • Page 57

    Maintenance 57 4 remove any torn pieces of paper. 5 fold some continuous-form paper over three times to make a page four sheets thick. Then, load it on the tractors and close and lock the covers. 6 use the platen knob to draw the quadruple-thick page around the platen. This brings out jammed pieces ...

  • Page 58

    58 microline 420/421 user’s guide single-sheet paper jams 1 turn off the printer. 2 use the platen knob to back the paper out. 3 open the access cover (1) and remove the pull-up roller assembly (2). 4 remove any torn pieces from around the carriage. 5 reinstall the pull-up roller assembly and close ...

  • Page 59: Cleaning The Housing

    Maintenance 59 cleaning the housing you should clean the printer housing every six months (or after about 300 hours of operation). Caution! Never use strong solvents or strong detergents on the cabinet—they could damage the housing. 1 turn off the printer. 2 use the platen knob to back the paper out...

  • Page 60: Chapter 6: Troubleshooting

    60 chapter 6: troubleshooting general information here are some general things to check before proceeding with detailed troubleshooting. • is the printer plugged in and turned on? • are the connections (power and interface) secure? • is the product being operated under the proper ambient conditions?...

  • Page 61: Problems / Solutions

    Troubleshooting 61 problems / solutions problem my word processor files do not print the way i have the menu and front panel set. Solution remember: • settings in your software application can override settings in your printer driver. • your printer driver settings can override any settings from the...

  • Page 62

    62 microline 420/421 user’s guide problem the printer does not print when the computer sends data. Solutions 1 is the sel light on? If not, press the sel key. 2 check that the interface cable is securely connected to both the printer and the computer. 3 if you have the optional serial interface boar...

  • Page 63

    Troubleshooting 63 problem ink smears on the paper when i print narrow columns. Solution this may be caused by excessive printhead travel from the centering position. Enter the menu and set the centering position to mode 1. See “using your printer, menu mode.” for the wide-carriage printer, if mode ...

  • Page 64

    64 microline 420/421 user’s guide problem there are dots missing in my printouts. Solution the head gap may not be set correctly. Try moving the headgap lever to a lower setting. If that doesn’t help, the printhead may be damaged; call for service. Problem the alarm light is flashing. Solution try t...

  • Page 65

    Troubleshooting 65 problem the printer needs paper. The alarm is not on and i can’t load paper. Solution 1 press and release the sel key. 2 press and hold the shift key and press the reset / character pitch key. The alarm light comes on and you can now load paper. Problem continuous-form paper stick...

  • Page 66

    66 appendix a: parts & accessories purchasing parts & accessories before you purchase, know your printer model number (see the front of the unit) and have the correct part number and description of the item. Item descriptions and part numbers are provided in this section. • consult the dealer where ...

  • Page 67: Replacement Parts

    Accessories 67 replacement parts item part number both models ribbon cartridge ( ) ------------------------------- 42377801 platen knob ( ) ------------------------------------- 51902220 power cord ( ) ------------------------------------- 56631801 printhead ( ) -------------------------------------...

  • Page 68: Accessories

    68 microline 420/421 user’s guide accessories option part number model ml420 pull tractor, top-mount ( ) ---------------------- 70030501 push tractor, bottom-mount ( ) ---------------- 70030701 roll paper stand ( ) ------------------------------- 70023301 model ml421 pull tractor, top-mount ( ) ----...

  • Page 69: Ibm Proprinter III Commands

    69 appendix b: printer control codes this section lists the most commonly used printer control codes. You will find a comprehensive listing of the control codes (english only), on your printer cd. To access it: 1 place the cd in your cd-rom drive and wait for it to autoplay. 2 select your printer mo...

  • Page 70: Ibm Proprinter III Commands

    70 microline 420/421 user’s guide ibm proprinter iii commands (continued) ibm command ascii decimal double width on esc w 1 27 87 49 double width off esc w 0 27 87 48 emphasized printing on esc e 27 69 emphasized printing off esc f 27 70 enhanced printing on esc g 27 71 enhanced printing off esc h 2...

  • Page 71: Ibm Proprinter III Commands

    Control codes 71 ibm proprinter iii commands (continued) ibm command ascii decimal overscore on esc _ 1 27 95 49 overscore off esc _ 0 27 95 48 paper out sensor off esc 8 27 56 paper out sensor on esc 9 27 57 print quality, select hsd esc # 0 27 35 48 print suppress mode on ml420 esc q etx 27 81 3 m...

  • Page 72: Epson Fx Commands

    72 microline 420/421 user’s guide epson fx commands epson command ascii decimal backspace bs 8 carriage return, execute cr 13 character pitch select 10 cpi esc p 27 80 select 12 cpi esc m 27 77 select 15 cpi esc g 27 103 begin 10 cpi esc si, or si 27 15, or 15 cancel condensed print dc2 18 delete de...

  • Page 73

    Control codes 73 epson fx commands (continued) epson command ascii decimal form length n inches (n = 1 to 22) esc c nul n 27 67 0 n n lines (n = 1 to 127) esc c n 27 67 n horizontal tab ht 9 justification left esc a 0 27 97 48 center esc a 1 27 97 49 right esc a 2 27 97 50 full esc a 3 27 97 51 line...

  • Page 74

    74 microline 420/421 user’s guide epson fx commands (continued) epson command ascii decimal print quality/font select hsd/ssd (depends on setting for draft mode) esc ( 0 27 40 48 select nlq esc x 1 27 120 49 select courier (nlq only) esc k 0 27 107 48 select gothic (nlq only) esc k 1 27 107 49 selec...

  • Page 75: Oki Microline Standard

    Control codes 75 oki microline standard commands oki command ascii decimal backspace bs 8 carriage return cr 13 character pitch select 10 cpi rs 30 select 12 cpi fs 28 select 15 cpi esc g 27 103 select 17.1 cpi gs 29 select 20 cpi esc # 3 27 35 51 character sets standard esc ! 0 27 33 48 block graph...

  • Page 76: Oki Microline Standard

    76 microline 420/421 user’s guide oki microline standard commands (continued) oki command ascii decimal line feed commands w/ carriage return lf 10 w/o carriage return esc dc2 27 18 n/144" (n = 0 to 127) esc % 5 n 27 37 53 n reverse esc lf 27 10 line spacing set spacing to 1/6" esc 6 27 54 set spaci...

  • Page 77: Oki Microline Standard

    Control codes 77 oki microline standard commands (continued) oki command ascii decimal shift-in si 15 shift-out so 14 software i-prime esc } nul 27 125 0 subscript printing on esc l 27 76 subscript printing off esc m 27 77 superscript printing on esc j 27 74 superscript printing off esc k 27 75 unde...

  • Page 78: Appendix C: Specifications

    78 appendix c: specifications note: specifications are subject to change without notice. Print method impact dot matrix printhead 9 pins, 0.30 mm (0.0118") diameter, with thermal protection interfaces standard: centronics parallel, ieee-1284 compliant usb 1.1 optional: rs-232c serial ethernet print ...

  • Page 79

    Specifications 79 emulations (co-resident) • ibm proprinter iii • epson fx • oki microline standard print speed speed mode (characters per second) super speed draft (ssd) 570 cps high speed draft (hsd) 507 cps utility 380 cps near letter quality (nlq) 95 cps characters per line (cpl) setting ml420 m...

  • Page 80

    80 microline 420/421 user’s guide graphics resolution max. Resolution emulation density (dots per inch) ibm, epson single 60 x 216 dpi double 120 x 216 dpi quadruple 240 x 216 dpi oki microline single 72 x 72 dpi double 144 x 144 dpi quadruple 288 x 144 dpi resident fonts print quality available fon...

  • Page 81

    Specifications 81 paper specifications: ml420 single (cut) sheets feed: top only weight: 14 to 24 lb. Us bond (52.6 to 90 g/m 2 ) width range: 7.2" to 8.5" (183 to 216 mm) single-part, continuous forms feed: rear, bottom* weight: 12 to 24 lb. Us bond (45 to 90 g/m 2 ) width range: 3" to 10" (76 to 2...

  • Page 82

    82 microline 420/421 user’s guide paper specifications: ml421 single (cut) sheet feed: top only weight: 14 to 24 lb. Us bond (52.6 to 90 g/m 2 ) width range: 7.2" to 14.3" (182.8 to 363.2 mm) single-part, continuous forms feed: rear, bottom* weight: 12 to 24 lb. Us bond (45 to 90 g/m 2 ) width range...

  • Page 83

    Specifications 83 environmental requirements temperature operating: 41 to 95°f (5 to 36°c) storage: 14 to 122°f (-10 to 50°c) humidity operating: 20 to 80% rh storage: 5 to 95% rh electrical requirements • 120 volts ac, (+6%, -15%) 50 or 60 hz (±2%) 58 w typical, 10 w idle • 230 ac, (+15%, -14 %) 50...

  • Page 84: Appendix D: Installation

    84 appendix d: installation location • place your printer on a firm, solid surface. • allow enough space around the printer to easily access the platen knob and the various paper feed paths. • make sure a suitable grounded power outlet is available nearby. Unpack • if any items are missing, contact ...

  • Page 85

    Installation 85 1 remove any packing tape, then grasp the tabs (1) at either end of the access cover and pivot it toward the front of the printer as far as it will go. 2 remove the printhead shipping restraint. 3 remove the shipping restraint from the pull-up roller assembly (1)..

  • Page 86

    86 microline 420/421 user’s guide 4 use the tabs (1) to lift and remove the sheet guide, then remove the shipping restraint. 5 reinstall the sheet guide: insert the clips on either side of the separator into the notches marked with a triangle, then press down to secure the separator in place..

  • Page 87

    Installation 87 caution! The printhead may be hot! 3 unpack the new ribbon cartridge and install it on the printhead. Important! Do not remove the ribbon shield (1) from the ribbon! 4 turn the take-up knob (1) in the direction of the molded-in arrow to take up any ribbon slack. 5 close the access co...

  • Page 88: Power Connection

    88 microline 420/421 user’s guide power connection 1 make sure both the printer and the computer are off. 2 plug the power cord into the back of the printer, then into a grounded outlet. 3 turn on the printer. Computer connections parallel (lpt): ieee 1284 • requires bidirectional cable, max. Length...

  • Page 89: Loading Paper

    Installation 89 usb: specification 1.1 compliant • requires usb 1.1 cable, maximum length 19.7 ft. (5 m), not supplied. • printer has usb “b” receptacle. 1 make sure the printer and computer are both turned off. 2 attach a suitable usb cable to the printer. Then attach the cable to your computer. 3 ...

  • Page 90: Testing The Printer

    90 microline 420/421 user’s guide testing the printer • font sample test • rolling ascii test • hexadecimal dump mode font sample test important! Wide carriage model ml421: if you are using 8.5" paper to run the tests, make sure the paper width selection in the printer menu is set to 8.5 inches. Oth...

  • Page 91

    Installation 91 rolling ascii test important! Wide carriage model ml421: if you are using 8.5" paper to run the tests, make sure the paper width selection in the printer menu is set to 8.5 inches. Otherwise, printing on the platen may damage the printer. See chapter 4: menu mode for more information...

  • Page 92: Emulations

    92 microline 420/421 user’s guide hexadecimal dump mode when the printer is placed in the hexadecimal dump mode, all data received, including text and printer commands, is printed in both hexadecimal and ascii format. For example, the following line of basic code lprint chr$ (27);”0”;chr$ (30);”this...

  • Page 93

    Installation 93 loading the oki driver parallel interface 1 insert the cd into your cd-rom drive. Note: if the cd does not autoplay, click start → run → browse, then browse to your cd-rom drive, double-click install.Exe and click ok. 2 select your printer model. 3 when the menu installer window appe...

  • Page 94: Index

    94 a accessories ............................................. 68 alignment problems ................................. 9 ascii test .............................................. 91 auto carriage return ............................... 35 auto lf (line feed) ........................ 31, 35 auto selec...

  • Page 95

    Index 95 f factory defaults, menu mode ................. 26 font sample test .................................... 90 fonts embedded printer commands ........... 62 resident ............................................. 80 selecting ............................................ 40 forms tear-off ........

  • Page 96

    96 microline 420/421 user’s guide o oki microline standard commands ....................................... 75–77 operator panel function ......................... 65 options ................................................... 66 p page length rear feed ........................................... 29...

  • Page 97

    Index 97 s self tests ................................................. 90 serial interface ........................................ 68 serial interface option ........................... 62 server, print option ................................ 68 sheet guide ...........................................