19 Mar
2010
19 Mar
'10
7:06 p.m.
I aquired a HP 2671A thermal printer and know that there should be an
upgrade ROM to 'upgrade' it to a HP 2671G.
Thanks to Tony excelent work on HPCC CDROM i have the schematics and was
able to fix the head positioning circuit.
One of the driver transistors (TIP 122) was bad after replacing it and
cleaning the printer it works fine.
You will find it prints on thermal fax paper without problems. But get
the 216mm wide stuff. I got some 210mm rolls and found it would print on
them without snagging the papepr if oyu got it positioned just right. I
turned a cuuple of brass spacers, but it's a lot less work to get the
right width paper.
But now I want to use it for printing graphics
(diagrams) and would be very
happy whith an image of the graphics ROM.
If you like I can pull the cover on my 2671G and see what the 3
programmed devices (2 8049 microcontrollers and a ROM) are labelled, and
the setting fo the EA pin switches on each of the boards (to see if the
8049 is using its intenal ROM). That will indicate what needs to be
replaced in your machine....
-tony