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dot matrix head

Posted on 1998-09-08
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Last Modified: 2010-04-12
i have an old dot matrix printer and i want to use its head (8 pin )without using the printer ,so where can i find the electric data sheets of its Andhow can i control it independant of the printer
please send you anser soon
thank you
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Question by:nilehawk
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Ok, you don't really need the head specs as a head is nothing more than an inductive coil.

You can get the DC ohms by measuring the resistence to common.

They are deigned for pulsed operation. Continuous DC will rapidly short out the head. You can derive the pulse rate by multiplying the CPS spec of the printer by the width of a char in dots. This is the pulse rate of the printhead. So if it prints, say, 100CPS and each character is 7 dots wide then the pulse rate is 700Hz - this is also the pitch of the annoying "zzzing" noise the printers make.

What brand of printer?

Heads usually run on +12 or so. You can check this by measuring the voltage on the common line to the print head. Most drivers are "low side". That is to say that the printhead common is the + supply and the driver's switch the low side of the coils to ground.

Since they're an inductive load you'll need kickback diodes across the coils to prevent back EMF from frying your driver electronics.

The printhead is not designed to be operated without a platen (the rubber roller). This (and the ribbon & paper) provide a limit stop and cushion for the print wires.

Pardon my curiosity, but what are you trying to make with an old printhead?

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