No printing since I took a part the fax for repair, there is no print possible, the page as a grey back backgroud, I verified all connection wired and the connecting pin for ground on drun unit. Can't find the problem do you have a solution for me thank you

print on thick paper

Hello;
The most common reason that laserjet's get grey background print-outs is that the toner cartridge's drum has gone bad. I have seen it many, many times on new and old cartridges and the only way to fix it is to buy a new toner cartridge. Sorry for the bad news.
Good Luck!
Rich Lilja

If your printer does not have a duplex unit that allow you to print on both sides, then it is possible but a bit teadious because you have to print one page at a time.

Print page 1 and then place page 1 back into the paper tray but place the page so it can print on the other side of the page then print page 2.
Repeat for page 3 & 4 and so on.

On the printer press setup-->choose tools option-->under tools-->choose print a fax test page.

Find out how is the printer connected with the fax line.

Note:- Line 1 at the back of the printer should be connected directly to the wall jack of phone line.

Now Follow the instrcution below.

1. Send a one page black and white text fax to 1-888-hpfaxme (1-888-473-2963).
2. When your fax is received by the HP Test Fax Service, They will generate a return fax to you within five minutes confirming that they have received your fax. This verifies that you can both send and receive a fax with your fax machine.

If you do not receive a return fax within 5-7 minutes, there may be a problem with the setup of your fax machine. Note:-The most common cause of failure is that the fax number set in the Fax Header on the machine does not match the number of the phone line connected to the fax. Also, ensure that the fax header contains the full 10-digit telephone number of the fax machine, including the area code.

From your start menu, go to printers and faxes area. When this opens do you see your printer listed? Is it greyed out at all or maybe listed as offline? How are you connected tot he computer? Network, USB, or parallel port connection? If you see your printer listed and it has no other duplicate listings, right click the printer and go to properties, then choose the Ports tab. Verify here that the port selected witha check mark corresponds with your connection method. Example: If you are connected through USB, your selected port should say USB. Sometimes DOT4 ports will work for USB connections too. If you see this option, you can select it and hit apply to try it out. Try to print a test page after each applied change. Also, make sure that print jobs haven't built up in your queue by double-clicking your printer icon. If there is a queue of failed print jobs, select them and cancel. This might take a moment to complete. If your printer icon is greyed out, right-click it and un-choose the work-offline option and try it.

From your start menu, go to printers and faxes area. When this opens do you see your printer listed? Is it greyed out at all or maybe listed as offline? How are you connected tot he computer? Network, USB, or parallel port connection? If you see your printer listed and it has no other duplicate listings, right click the printer and go to properties, then choose the Ports tab. Verify here that the port selected witha check mark corresponds with your connection method. Example: If you are connected through USB, your selected port should say USB. Sometimes DOT4 ports will work for USB connections too. If you see this option, you can select it and hit apply to try it out. Try to print a test page after each applied change. Also, make sure that print jobs haven't built up in your queue by double-clicking your printer icon. If there is a queue of failed print jobs, select them and cancel. This might take a moment to complete. If your printer icon is greyed out, right-click it and un-choose the work-offline option and try it.

well that u can use the following methhod in repairing it
firstly make sure there is enough ink in your printer
Aslo make sure ur printer is connected to ur desire colour by clicking on the printer and faxes folder then right click on your printer go to properties and advance setting where u will see options for different probs. click on black and white if it is a coloured printer or blue and so onnnnnnnnnnn

try a test page first to determine that the printer has basic abilities.

http://tinyurl.com/6qcpgy

Are the problem prints all from the same source? If so the problem could be on the transmission end. Can you connect to your fax and print to it from a local workstation? If so print several images with dark solid patterns and see if it is actually the printhead. Try printing in cyan, magenta, yellow, and black colors to to rule out each individual printhead.

It is the fuser at rear giving you grief! The upper heat roller has a teflon coating that wears away allowing toner to stick to roller and smudgin prints as they pass threw it. The fix is to replace fuser assembly, take to brother dealer to fix.

You can prove it to yourself by timing the print to stop mid way threw machine then remove print cartridge and look at paper, you should see a image is good untill it hits the fuser,( pre fused image "rubs off" paper.) If you have changed drum and toner thats all it can be. They all do it in time.

Fuser is hot bit at rear, pull out drum and look in the back with a small torch you will see upper heat roller is worn, guestimation $90 for fuser plus labour to fit.