Question about Zeiss Humphrey 740 Visual Field Analyzer

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Why won't my printer work if the machine gets too hot?

The printer needs to be turned off between patients so it doesn't get to hot to print

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Hello. It sound like you have to be sure that the papar is free inside the printer. Have you tried with external printer,

Posted on Oct 01, 2014

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  • 39 Answers

Is the cooling fan turning?

Posted on Apr 29, 2014

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The screen displays PE, machine stops working


PE means Printer Error. your printer is stuck. call a tech

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1 Answer

Printer won't print


Try to uninstall the Lexmark software and download an updated driver online: http://bit.ly/fc591p

Also, check your security software (firewall) if all of the Lexmark applications are allowed.

If it doesn't work, please contact our technical support team. You can find our contact number at www.lexmark.com.

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Have a Samsung SCX 4521F printer scanner machine. Toner is full but won't print when trying to photocopy....will print if something is faxed. The bulb doesn't seem to come on when it starts to...


push menu and # 1943
the fax will go in service mode
push menu again and scrolle until you get new cartrige
push ok
then swich the machine of and on
and it will work

Jul 13, 2011 | Samsung SCX 4521F All-In-One Laser Printer

1 Answer

Won't print black, prints every other colour ok


1. try to cleaning head
2. remove the black cartridge only, (if it doesn,t changed after you cleaned head)
3. provide some warm/hot water on a bowl or plate.
4. enter the HEAD of black cartridge in to hot water. soak with depth about 2mm up to 5mm. while you see the ink is come out....
5. after the black ink has come out. pat dry with a paper towels/tissue.
6. replace the cartridge in to printer.
7. cleaning head again and print test page
good luck....

Jun 19, 2011 | Canon Pixma MP500 All-In-One InkJet...

1 Answer

How do you turn off the printing every time you use the machine do not need it to work. 130cr i have


You can't turn it off on this model. If you don't want to use paper, that is fine, but just make sure you take out the ink roller so it doesn't build up ink in the printer. then you can run it without paper and it won't be damaged.

May 26, 2011 | Casio Parts Cash Register PC Desktop

1 Answer

HOT TO ADJUST THE TEAR HEIGHT ON A MICROLINE 490 WITHOUT USING THE SETUP DISC


If you are using regular letter size continuous printer paper, load the paper normally with the machine turned off. You can even turn the knob to feed the paper through, it doesn't matter how far. Turn the printer back on and press "PARK" button. Then press the "FF/LOAD" button and when you begin printing it will automatically print at the top of form (TOF). If the TOF ever gets thrown off you can press "LINE FEED" until the tear is where you want it and press "SHIFT" > "TOF" to back back to the previous page (or top of form).
Simply put, pressing "PARK" then "LOAD" should set the tear where you need it.

May 20, 2011 | OKI MICROLINE 490 Matrix Printer

1 Answer

Printer is not printing right it keeps saying


ok! printers are the most difficult machines to work with you must be very patient ok! Now just turn your printer off and then turn on make sure that your computer recognizes your printer driver if not you are going to run in a whole lots of trouble once thats cool do a printer test page and if that doesnt work you need to reply back to me ok!

Mar 26, 2010 | Kodak ESP 5 Printer

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