Manuel d'utilisation / d'entretien du produit ML420 du fabricant Oki
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User’s Guide 593 483 01.
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.
3 Safety Y our Oki printer has been carefully designed to gi ve 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.
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. • T o pr otect 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 or heat register .
5 Cont ents Safety ............................................................................ 3 Chapter 1: Introduction ............................................. 7 Printer Features ................................................................
6 Microline 420 / 421 User’s Guide Chapter 4: Menu Mode ............................................ 25 Menu Mode Keys ....................................................................... 25 Entering and Exiting Menu Mode ........................
7 Chapt er 1: Introduction Oki Data on the Internet The Oki Data W eb Sites provide the most current inf ormation av ailable on your printer . On-line documents are available for viewing and downloading via Oki Data’ s W eb Sites. Y ou may reach Oki Data via the Internet at: • www .
8 Chapt er 2: Helpful Hints Saving Time Internet Support Oki Data provides support via the Internet: • www .okidata.com is the main w eb site, the gatew ay to Oki Data’ s products and services.
Helpful Hints 9 Operation Tips T op of Form (T OF) T op of Form (TOF) sets the print start position. The factory default is 1" from the top. The T op of Form can be changed in increments of 1/180", either for a single print job or set to a new default.
10 Note: F or r ear feed, the paper lever must be forward. Chapt er 3: Using Y our Print er P a rts Identification: Rear Feed (Continuous Forms) Note: The serial number of your printer is on a label on the back, beside “S/N.
Using Your Printer 11 P ar ts Identification: T op F eed (Single Sheets) Paper Guides Sheet Guide Paper Lever On-Of f Switch Platen Knob Control Panel Acoustic Cover (open) Note: F or single-sheet printing, the paper le ver must be in the middle position.
12 Microline 420/ 421 User’s Guide T op of Form (T OF) Important! If you turn the platen knob when the printer is on, the T op of F orm misaligns. Always shut the printer of f before turning the platen knob! Note: The factory default setting for the T op of F orm (wher e the printing should be gin) is 1" down fr om the top of the page.
Using Your Printer 13 Determining if F orms T ear-Off is Off or On There are two ways to determine the status of the Forms T ear-Of f menu setting: • Print the Menu. • Use the TEAR key . T o print the Menu: 1 Make sure paper is loaded. 2 Hold SHIFT (2), then press SEL (1) to enter the Menu Mode.
14 Microline 420/ 421 User’s Guide Setting T op of Form (T OF): Forms T ear- Off OFF (Default Setting) Important! If you turn the platen knob when the printer is on, the T op of F orm misaligns.
Using Your Printer 15 Setting T op of Form (T OF): Forms T ear- Off Set to ON Important! If you turn the platen knob when the printer is on, the T op of F orm misaligns. Always turn the printer of f before turning the platen knob! Note: The fi rst line prints at the red line (1) of the plastic paper shield on the printhead.
16 Microline 420/ 421 User’s Guide T emporarily Changing the T op of F orm P osition Important Do not use the platen knob to change the T op of F orm.
Using Your Printer 17 F orms T ear-Off Feature Note: This featur e is normally turned off. T o use F orms T ear-Of f, you must enter the menu and chang e the setting to the desir ed time interval (see next pag e). The Forms T ear-Of f feature allows a printed continuous forms page to be torn of f without wasting paper or adjusting the printer .
18 Microline 420/ 421 User’s Guide Chang ing the Forms T ear-Off Setting Note: The default setting for F orms T ear -Off is OFF . T o c hange the Forms T ear-Of f setting: 1 Press SHIFT (2) + SEL (1).
Using Your Printer 19 Changing Paper Paths Continuous Forms to Single Sheets 1 T ear of f any printed pages, then press P ARK . 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 .
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/LO AD to remove the single-sheet paper .
Using Your Printer 21 T o adjust the gap, open the access cover and mo ve the blue lever (1) to the recommended setting from the table. Setting Media 1 Regular paper 2 2-part form (with carbon) 3 3-pa.
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.
Using Your Printer 23 Epson and I B M 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.
24 Microline 420 / 421 User’s Guide Printer Reset Clearing some error conditions requires that you reset (reinitialize) the printer . T o do this: 1 Press and release SEL (1) to take the printer of f-line. The SEL light goes out. 2 Press and hold SHIFT (2), then press the RESET / CHARA CTER PITCH key .
25 Chapt er 4: Menu Mode GROUP Key Prints the next Group in the Menu. W ith the SHIFT key , prints the pre vious Group. ITEM Key Prints the next Item in the Group. W ith the SHIFT key , prints the previous Item in the Group. SET Key Prints the next setting for an Item.
26 Microline 420/ 421User’s Guide Entering and Exiting Menu Mode T o 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 befor e you r eset or change them.
Mode Menu 27 Chang ing the Menu Settings Note: Please print the current Menu Mode settings befor e you r eset or change them. This is the onl y way to have a r ecord of the settings.
28 Microline 420/ 421User’s Guide Menu Settings T able For a complete e xplanation of each menu item, see “Explanations of Menu Items” later in this c hapter . 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 .
Mode Menu 29 Menu Settings T able (Continued) Group Item Settings (Defaults are set in bold italic) Rear Feed Line Spacing 6 LPI , 8 LPI Form T ear-Of f Off , 500 ms, 1 sec, 2 sec Skip Over Perforation No , Y es Page Width (wide model) 13.6" , 8" Page Length 11" , 11-2/3", 12", 14", 17", 5", 3", 3.
30 Microline 420/ 421User’s Guide Menu Settings T able (Continued) Group Item Settings (Defaults are set in bold italic) T op F eed Line Spacing 6 LPI , 8 LPI Form T ear-Of f* Off , 500 ms, 1 sec, 2 sec Bottom Margin V alid , In valid Page Width (wide model) 8" , 13.
Mode Menu 31 Menu Settings T able (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 right.
32 Microline 420/ 421User’s Guide Menu Settings T able (Continued) Group Item Settings (Defaults are set in bold italic) SI Select Pitch (10 cpi)* 15 cpi, 17.
Mode Menu 33 Menu Settings T able (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 /.
34 Microline 420/ 421User’s Guide Menu Settings T able (Continued) Group Item Settings (Defaults are set in bold italic) CSF Bin 1* Line Spacing 6 LPI , 8 LPI Bottom Margin V alid , In valid Page W idth (W ide model) 8" , 13.6" Page Length 11" , 11-2/3", 12", 14", 17", 5", 3.
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 system uses 8-bit graphics.
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 allo wing printing without paper .
Mode Menu 37 CSF Type, Default = Wide T o avoid paper jams, change this setting to Narrow if you are using the optional Cut Sheet Feeder on the wide model ML421 printer . Diagnostic T est, Default = No Appears only when the optional Serial Interface is installed.
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 b uffer contents before resetting. • Buffer Clear: dumps the b uffer contents immediately .
Mode Menu 39 Page Width, Default = Depends on Feed Path W ide 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 pre vents printing on the platen which can damage the printhead and the platen, and can cause loss of data.
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.
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.
42 1 Make sure the printer is turned OFF . 2 Open the access cover and center the printhead. Chapt er 5: Maint enance 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 .
Maintenance 43 CAUTION! The printhead may be HO T! 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 T urn the take-up knob (1) in the direction of the arrow to take up any ribbon slack.
44 Microline 420 / 421 User’s Guide Loading Rear Feed P aper from the Back of the Printer Note: These instructions assume you have r eady access to the back of the printer . If you do not, skip down to “Loading Rear F eed P aper fr om the F r ont of the Printer .
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.
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.
Maintenance 47 8 Place continuous forms paper on the first two pins of either tractor . Important! Y ou must k eep 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 cov er .
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 abov e) in the sheet guide on the pull-up roller assembly .
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 F eed P aper fr om the Rear of the Printer” earlier in this chapter .
50 Microline 420 / 421 User’s Guide Note: The movement of the left tractor ( as viewed from the front of the printer ) is r estricted to ensure that the paper covers the paper out sensor .
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 lev er . Do not stretch the paper . Note: If the paper is too loose or too tight it can cause jams.
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 T op of F orm (wher e the printing should be gin) is 1" down fr om the top of the page .
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. T op Feed (Single Sheets) Note: If you have continuous form paper in the path, press P ARK to r emove it befor e loading single sheets.
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.
Maintenance 55 Clearing Paper Jams Rear-Feed Paper Jams 1 T urn of f 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 of f before you open the access cover . 3 Open the access cover (1) and remove the pull-up roller assembly (2).
56 Microline 420 / 421 User’s Guide Bits of Paper Stuck in the Paper Path 1 T urn off the printer . 2 Use the platen knob to back the paper all the way out of the printer . CAUTION! Make sur e the printer is turned off before you open the access cover .
Maintenance 57 4 Remov e 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.
58 Microline 420 / 421 User’s Guide Single-Sheet Paper Jams 1 T urn 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.
Maintenance 59 Cleaning the Housing Y ou should clean the printer housing ev ery 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 T urn of f the printer .
60 Chapt er 6: T roubleshooting General Information Here are some general things to check before proceeding with detailed troubleshooting. • Is the printer plugged in and turned on? • Are the conn.
Troubleshooting 61 Problems / Solutions Problem My wor d pr ocessor files do not print the way I have the menu and fr ont panel set. Solution Remember: • Settings in your software application can override settings in your printer dri ver . • Y our printer dri ver settings can ov erride any settings from the printer menu or printer front panel.
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 ke y . 2 Check that the interface cable is securely connected to both the printer and the computer .
Troubleshooting 63 Problem Ink smears on the paper when I print narr ow 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 Y our Printer, Men u Mode.
64 Microline 420 / 421 User’s Guide Problem Ther e ar e dots missing in my printouts. Solution The head gap may not be set correctly . T ry moving the headgap lev er to a lower setting. If that doesn’ t help, the printhead may be damaged; call for service.
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 / CHARA CTER PITCH key . The ALARM light comes on and you can now load paper .
66 Appendix A: P ar ts & 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.
Accessories 67 Replacement Parts Item Part Number Both Models Ribbon Cartridge ( ) ------------------------------- 42377801 Platen Knob ( ) ------------------------------------- 51902220 Power Cord ( .
68 Microline 420 / 421 User’s Guide Accessories Option Part Number Model ML420 Pull T ractor , T op-Mount ( ) ---------------------- 70030501 Push T ractor , Bottom-Mount ( ) ---------------- 700307.
69 Appendix B: Print er Control Codes This section lists the most commonly used printer control codes. Y ou will find a comprehensi ve listing of the control codes (English only), on your Printer CD. T o access it: 1 Place the CD in your CD-ROM drive and wait for it to AutoPlay .
70 Microline 420/ 421 User’s Guide I B M Proprinter II I Commands (continued) IB M Command AS C II Decimal Double W idth On ESC W 1 27 87 49 Double W idth Off ESC W 0 27 87 48 Emphasized Printing On.
Control Codes 71 I B M Proprinter II I Commands (continued) IB M Command AS C II Decimal Overscore On ESC _ 1 27 95 49 Overscore Off ESC _ 0 27 95 48 Paper Out Sensor Of f ESC 8 27 56 Paper Out Sensor.
72 Microline 420/ 421 User’s Guide Epson FX Commands Epson Command AS CI I 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 S.
Control Codes 73 Epson FX Commands (continued) Epson Command ASC II 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 T ab HT 9 Justifi.
74 Microline 420/ 421 User’s Guide Epson FX Commands (continued) Epson Command AS CI I Decimal Print Quality/Font Select HSD/SSD (depends on setting for Draft Mode) ESC ( 0 27 40 48 Select NLQ ESC x.
Control Codes 75 Oki M ICROLI N E Standard Commands Oki Command AS CI I 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.
76 Microline 420/ 421 User’s Guide Oki MICROLINE Standard Commands (continued) Oki Command AS CI I Decimal Line Feed Commands w/ Carriage Return LF 10 w/o Carriage Return ESC DC2 27 18 n/144" (.
Control Codes 77 Oki MICROLINE Standard Commands (continued) Oki Command AS CI I Decimal Shift-In SI 15 Shift-Out SO 1 4 Software I-Prime ESC } NUL 27 125 0 Subscript Printing On ESC L 27 76 Subscript.
78 Appendix C: Specifications Note: Specifications ar e subject to change without notice . Print Method Impact dot matrix Printhead 9 pins, 0.30 mm (0.0118") diameter , with thermal protection Interfaces Standar d : Centronics parallel, IEEE-1284 compliant USB 1.
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 Draf.
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 Si.
Specifications 81 Paper Specifications: ML420 Single (Cut) Sheets Feed: T op Onl y W eight: 14 to 24 lb . US Bond (52.6 to 90 g/m 2 ) W idth Range: 7.2" to 8.5" (183 to 216 mm) Single-part, continuous forms Feed: Rear , Bottom* W eight: 12 to 24 lb .
82 Microline 420 / 421 User’s Guide Paper Specifications: ML421 Single (Cut) Sheet Feed: T op Onl y W eight: 14 to 24 lb . US Bond (52.6 to 90 g/m 2 ) W idth Range: 7.2" to 14.3" (182.8 to 363.2 mm) Single-part, continuous forms Feed: Rear , Bottom* W eight: 12 to 24 lb .
Specifications 83 Environmental Requirements T emperature 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 Requ.
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 .
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).
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.
Installation 87 CAUTION! The printhead may be HO T! 3 Unpack the new ribbon cartridge and install it on the printhead. Important! Do not remove the ribbon shield (1) from the ribbon! 4 T urn the take-up knob (1) in the direction of the molded-in arrow to take up any ribbon slack.
88 Microline 420 / 421 User’s Guide P ower Connection 1 Make sure both the printer and the computer ar e OFF . 2 Plug the power cor d into the bac k of the printer , then into a grounded outlet. 3 T urn on the printer . Computer Connections P arallel (LPT): IEEE 1 2 84 • Requires bidirectional cable, max.
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 .
90 Microline 420 / 421 User’s Guide T esting the Printer • Font Sample T est • Rolling ASCII T est • Hexadecimal Dump Mode F ont Sample T est Important! W ide car r ia g e 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.
Installation 91 Rolling AS CII T est Important! W ide car r ia g e 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 .
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 is an example of a hexadecimal dump.
Installation 93 Loading the OKI Driver Parallel Interface 1 Insert the CD into your CD-R OM dri ve. Note: If the CD does not A utoPlay , click Start → Run → Br owse, then br owse to your CD-ROM drive , double-click Install.exe and click OK. 2 Select your printer model.
94 A Accessories ............................................. 68 Alignment problems ................................. 9 ASCII T est .............................................. 91 Auto Carriage return ............................... 3 5 Auto LF (Line Feed) .
Index 95 F Factory defaults, menu mode ................. 26 Font Sample T est .................................... 90 Fonts Embedded Printer Commands ........... 6 2 Resident ............................................. 80 Selecting .................
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 .
Index 97 S Self T ests ................................................. 90 Serial Interface ........................................ 68 Serial Interface Option ........................... 6 2 Server , Pr int Option ................................ 68 Sheet Guide .
Un point important après l'achat de l'appareil (ou même avant l'achat) est de lire le manuel d'utilisation. Nous devons le faire pour quelques raisons simples:
Si vous n'avez pas encore acheté Oki ML420 c'est un bon moment pour vous familiariser avec les données de base sur le produit. Consulter d'abord les pages initiales du manuel d'utilisation, que vous trouverez ci-dessus. Vous devriez y trouver les données techniques les plus importants du Oki ML420 - de cette manière, vous pouvez vérifier si l'équipement répond à vos besoins. Explorant les pages suivantes du manuel d'utilisation Oki ML420, vous apprendrez toutes les caractéristiques du produit et des informations sur son fonctionnement. Les informations sur le Oki ML420 va certainement vous aider à prendre une décision concernant l'achat.
Dans une situation où vous avez déjà le Oki ML420, mais vous avez pas encore lu le manuel d'utilisation, vous devez le faire pour les raisons décrites ci-dessus,. Vous saurez alors si vous avez correctement utilisé les fonctions disponibles, et si vous avez commis des erreurs qui peuvent réduire la durée de vie du Oki ML420.
Cependant, l'un des rôles les plus importants pour l'utilisateur joués par les manuels d'utilisateur est d'aider à résoudre les problèmes concernant le Oki ML420. Presque toujours, vous y trouverez Troubleshooting, soit les pannes et les défaillances les plus fréquentes de l'apparei Oki ML420 ainsi que les instructions sur la façon de les résoudre. Même si vous ne parvenez pas à résoudre le problème, le manuel d‘utilisation va vous montrer le chemin d'une nouvelle procédure – le contact avec le centre de service à la clientèle ou le service le plus proche.
