Some pages offset printing

Sounds like it's congealed ink on the print head. You can buy cleaning kits and do it your self. Relatively in expensive compared to leaving it into the shop.

Hello sir , I have installed Datamax I class printer with my pc & now i want to take the printout by using the bartender software.
previously i used zebra printer so i have label format but now
Problem is :
after give the command to datamax printer
print format comming very small not as per define format.

http://www.brother-usa.com/ModelDocuments/Consumer/Software%20Users%20Manual/SUM_DCP_7030_7040_MFC_7340_7345N_7440N_7840W_EN_1650.PDF

here is the manual p4 and p16 discuss the topic:
Duplex printing 1
The supplied printer driver supports duplex printing.
Guidelines for printing on both sides of the paper 1
�� If the paper is thin, it may wrinkle.
�� If paper is curled, turn over the stack, straighten it and then put it back in the paper tray or the Manual Feed
Slot.
�� If the paper is not feeding properly, it may be curled. Remove the paper, straighten it and turn over the
stack.
�� When you use the manual duplex function, it is possible that there may be paper jams or poor print quality.
If there is a paper jam, see Paper jams in the User’s Guide. If you have a print quality problem, see
Improving the print quality in the User’s Guide.
Manual duplex printing 1
The machine prints all the even-numbered pages on one side of the paper first. Then, the Windows® driver
instructs you (with a pop-up message) to reinsert the paper. Before reinserting the paper, straighten it well,
or you may get a paper jam. Very thin or thick paper is not recommended.
Simultaneous scanning, printing and faxing 1
Your machine can print from your computer while sending or receiving a fax in memory, or while scanning a
document into the computer. Fax sending will not be stopped during PC printing. However, when the machine
is copying or receiving a fax on paper, it pauses the PC printing operation, and then continues printing when
copying or fax receiving has finished.


�� Manual Duplex
Check Manual Duplex. In this mode, the machine prints all the even numbered pages first. Then the
printer driver stops and shows the instructions required to re-install the paper. When you click OK the odd
numbered pages are printed. There are six types of manual duplex binding directions available for each
orientation.
�� Booklet Printing
When you want to print a booklet, use this function. To make the booklet, fold the printed pages down the
middle.
�� Binding Offset
If you check the Binding Offset option, you can also specify the offset for binding in inches or millimeters

you still have a piece of paper stuck some where in the paper path have a closer look

Try printing out the test page from the printer, this will show you if any of the inkjet holes are getting plugged. If you can't print a test page without the skipping try changing the ink cartridge(s), the test page will show you which one is clogging.

Carl

Let's verify the main source of the problem:
Are you possibly printing web pages? Some are not very printer friendly, and could fit the description you give.
If you can print successfully from another application (notepad, MS Word, etc.), your printer is working and the issue is software related (setup, etc.), and not the device. Check your page setup to see if you have the correct page size, orientation and offsets set correctly.

If all apps fail, check your printer's User Guide for more information.

Dear
Please contact samsung Call center in your region. fothis type of support.

problem with page set.

I have a C1900 with an error "Service Req E021". I appreciate any help as to what this refers to please.

What is the stats % of drums if low under 50% change them, soon as you add non Gen you throw a spanner in any attempt to fault find, fix is possible toner more than likely drum/drums, do a print of each colour and change drums as indicated by failure in its colour to print, check transport belt is OK and led heads are clean