HP Laserjet 1012 print positioning

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My HP Laserjet 1012 isn't measuring it's printing positions very precisely.
The entire page is printed about 2 mm too high.
My default paper size is A4.
I'm using a template in Word that prints a letter, which I fold down to 9.9
cm (exactly 1/3rd of an A4-size paper) to fit in a DL-size envelope. To make
folding easier and precise, I print a small horizontal line at 9.9 cm from
the top and 19.5 cm from the left of the page.
My Laserjet 1012 puts this horizontal line at 9.7 cm from the top of the
page.
No big deal, you would say, but I also do a lot of printing from Publisher
on landscape oriented pages, divided into 3 columns. The output is 2 mm too
far to the right, which means there is a bigger left margin and a smaller
right margin. I want the margins to be exactly the same.

Is there a way to correct this?

Wouter.