Home » Oki » Dot Matrix Printers » Oki ML421

Oki ML421 Support Question

Find answers below for this question about Oki ML421.
Need a Oki ML421 manual? We have 17 online manuals for this item!

Oki Overview Questions Manuals Reviews Videos Research

Question posted by adl on August 14th, 2012

Replacement

How to replace a print head on a oki microline 421?

I Know the Answer!

I have the same question
Request More Information

Current Answers

Answer #1: Posted by support38611 on August 15th, 2012 12:03 AM

This answer was accepted by the poster of the original question.

support38611

Member since:
March 23rd, 2012

Points: 203,070

1,100
points

I am an Oki Data helpdesk technician from Oki Data America's.(1) Open the access over.(1) Power the printer off.
(2) Pull up and rotate the head clamp to unclamp the printhead
(3) Disconnect the printhead from PC connector.
(4) To install, follow the removal steps in the reverse order.
Notes on installation:

(1) Insert the printhead into the PC connector while pushing it against the carriage
frame .
(2) The head clamp must surely be sandwiched between printhead and carriage
frame as shown
(3) Be sure to check the gap between platen and printhead
(4) Be careful not to touch the print head while it is very hot.
(5) Make sure that there is not any dust or oil on the connector contact. If it is found, wipe it off by alcohol If you need further assistance or have any questions, please contact our technical support number at 1-800-654-3282 available 24/7. You can also send email request's to our email support address at [email protected].

Related Oki ML421 Manual Pages

Network User's Guide for OkiLAN 6020e - Page 18

... information, press the Test button on the CD. The selected language must match the printer's configured language to print in PostScript or PCL, select this section. I - Section I - 8 OKI OkiLAN 6020e User's Guide You can also print configuration information using the utility program provided on the front of the OkiLAN 6020e. Hardware Installation Note: If...

Network User's Guide for OkiLAN 6020e - Page 55

...Port Number Select the port you wish to the PCL print language. Print data stream will be sent directly to switch the language of the printer. • OFF - For specific information on other ... on the bottom right of each print job. Unless OFF is used to determine the actual characters required to the output port without alteration. • PCL - OKI OkiLAN 6020e User's Guide III -...

Network User's Guide for OkiLAN 6020e - Page 56

... on your OkiLAN 6020e. Chapter 2 - Note: If you are not switching languages or the printer can switch languages automatically, this option should be printed, troubleshooting abilities are limited. Configuration Page Language Select the appropriate printer language for switching the printer to OFF. To enter nonprintable characters, enclose the ASCII value of the character in...

Network User's Guide for OkiLAN 6020e - Page 111

..., to the PCL print language. TCP/IP OKI OkiLAN 6020e User's Guide IV - 29 Print data stream will be set to the PostScript printer language. • Automatic - Section 4 - Inserts the appropriate character string in front of each print job to switch the printer to the appropriate printer language. OkiNet for switching the printer to the PostScripti print language. Enables...

Network User's Guide for OkiLAN 6020e - Page 204

... optional field where you may check the status of paper) the error description will check the printer status prior to printing the job. If a printer error is especially busy. Section 7 - Note: To obtain a version of network traffic. VII - 6 OKI OkiLAN 6020e User's Guide OkiLAN 6020e Connect for DLC OkiLAN 6020e Connect for Data-Link...

OkiLAN 6120 Install and Regulatory Guide - Page 5

... for the IP Address to the factory default settings and reboots. 5: English OKI, OkiLAN ® Oki Electric Industry Company, Ltd.; The print server resets to use LPR to correct the interference at their own expense. If you need help, please contact your printer: when you use . European Union Council of the European Communities Statement...

Microline 420& ML490 Series Warranty, Regulatory, and Safety Information - Page 3

...in the User's Guide, this and all other electrical equipment. When the product cover is replaced by pulling on the cable can cause overheating which the product is connected is easily accessible at.... otherwise there is a risk of fire and electric shock, do not touch the fuser unit or print head as a safety feature and will only connect to defeat the earthing or there is a risk of...

Guide: User's, ML420/421 (English) - Page 6

...Defaults 26 Printing the Menu Settings 26 Changing the Menu Settings 27 Menu Settings Table 28 Explanations of Menu Items 35 Chapter 5: Maintenance 42 Replacing the Ribbon...66 Purchasing Parts & Accessories 66 Replacement Parts 67 Accessories 68 Appendix B: Printer Control Codes 69 IBM Proprinter III Commands 69 Epson FX Commands 72 Oki MICROLINE Standard Commands 75 Appendix C: ...

Guide: User's, ML420/421 (English) - Page 78

Appendix C: Specifications Note: Specifications are subject to Repair (MTTR) 15 minutes 78 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 Servers: 6120i 10/100 Base-T, Internal 6020e 10/100 Base-T, External 6010e 10 Base-T, ...

Guide: User's, ML420/421 (English) - Page 79

Emulations (co-resident) • IBM Proprinter III • Epson FX • Oki MICROLINE Standard Print Speed Mode Super Speed Draft (SSD) High Speed Draft (HSD) Utility Near Letter Quality (NLQ) Speed (Characters per Second) 570 cps 507 ...) Setting 10 cpi 12 cpi 15 cpi 17.1 cpi 20 cpi ML420 80 cpl 96 cpl 120 cpl 137 cpl 160 cpl ML421 136 cpl 163 cpl 204 cpl 233 cpl 272 cpl Specifications 79

Guide: User's, ML420/421 (English) - Page 96

... 61 Parts, replacement, purchasing 66 Perforation, skip over 29, 41 Pitch, character 28, 39 PlatenKnob part number 67 Postnet 80 Power rating 3 Print Method 78 Print Mode 28, 40 Print Registration 31, 40 Print Server Option 68 Print Size 79 Print Speed 7, 79 Print Suppress 31, 40 Printer Control Codes 69-77 Printer Drivers, Selecting 92-93 Printer Parameters 25 Printhead...

ML420, ML:421, ML490, ML491 Warranty, Regulatory, and Safety Information (Englsih, Fran栩s, Espa?ol. Portugu鱩 - Page 3

.... If any liquid (for your product's rating label on the product that should be closed or replaced and secured to avoid injury or damage: Ensure this product for any risk of electric shock, fire... cable to give years of fire and electric shock, do not touch the fuser unit or print head as you have a suitable power supply before removing the object. This product has an earthed plug...

ML420, ML:421, ML490, ML491 Warranty, Regulatory, and Safety Information (Englsih, Fran栩s, Espa?ol. Portugu鱩 - Page 6

... provide reasonable protection against harmful interference in conformity with the limits for energy efficiency. Regulatory Information ENERGY STAR®: ML421 and ML491 Printers As an ENERGY STAR Partner, Oki Data has determined that the ML421 and ML491 models meet ENERGY STAR guidelines. Note: ML420 and ML490 models do not meet the ENERGY STAR guidelines...

ML420/ML421/ML490/ML491 Safety/Warranty/Regulatory Guide - Page 3

... both the product and mains power switches are a few basic precautions that should not require replacement during the life of injury. is fitted, exercise care when moving parts when the product is... this may receive burns. It is recommended that you do not touch the fuser unit or print head as electric shock, fire and/or injuries may cause a fire. Operation of safe, reliable ...

ML420/ML421/ML490/ML491 Safety/Warranty/Regulatory Guide - Page 6

...Information ENERGY STAR®: ML420, ML421, ML490 and ML491 Printers As an ENERGY STAR Partner, Oki Data has determined that the ML420, ML421, ML490 and ML491 models meet ... the separation between the years 1999 and 2000, and carries no guarantee that may void your printer. Operation is the responsibility of the user to electromagnetic compatibility. European Union Council of the European...

Maintenance Manual - Page 54

... tools No. Oki Data CONFIDENTIAL 3.2 Service Tools Table 3.1 lists the tools necessary for replacing printed circuit boards and parts of units in the field. Service Tool Q'ty Use Remarks 1 No. 1-100 Phillips screwdriver 1 Screws 2.6 mm 2 No. 2-200 Phillips screwdriver 1 Screws 3-5 mm 3 No. 3-100 screwdriver 1 4 Spring hook 1 5 J-YX4025-83335-3 1 Head gap adjustment 6 Volt...

Maintenance Manual - Page 96

Oki Data CONFIDENTIAL 6.3 Lamp Display (1) Printer mode display Table 6.2 ALARM CATEGORY ALARM ALARM Paper end alarm ON Paper change ) (2) Fault alram display When the printer detects ... Print head temperature exceeds 119°C • Wait until it is already inserted from rear or bottom. • Set the lever to specified position. • Check rear sensor lever. • Replace ...

Maintenance Manual - Page 98

... OFF) : LED Lights up Oki Data CONFIDENTIAL 98 / connection. • Replace Print Head. • Replace P.H. Thermister is open, short with 0V or short with +5V. • Replace P.H. cable. • Replace Control Board • Check the mechanisms if load is not occurred within in specified timing. cable. • Replace Space Motor Assy. • Replace Control Board FAN motor does...

Maintenance Manual - Page 108

Remedied? No Yes End Replace Printhead. No Yes End Replace Control Board. Remedied? Yes No Adjust the printhead gap (see section 5). Remedied? Oki Data CONFIDENTIAL 42113901 Rev.2 108 / No Yes End Replace Ribbon feed mechanism. 6 Faint or dark print Is the print head gap set properly?

Maintenance Manual - Page 112

Oki Data CONFIDENTIAL 0 Data receiving failure Is the SEL LED blinking? Wait until printer to invalid, or check for defective cable. No Yes To step 10-2 Does the SEL LED light up ? No Yes End Replace...Does the printer receive data properly? Replace Control Board. No Yes 10-1 To step 10-1 End Disconnect I -prime to receives DC1 code, or change the menu item "Print suppress-...