Question about Casio DR-250HD Calculator

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Changing the ribbon

I am having difficulty opening the cover so I can change the ribbon
I don't think it's ever been done and this machine is more than a few years old and understandably hard to read now.
I don't want to break the cover, but is there some trick or perhaps something is jamming it internally?

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I just had the same problem today except I needed open because of a paper jam. Anyways, I started by using a philips head screwdriver and pried by where the plug is and worked my way around. The cover is held on by the screws on the bottom and some tabs inside. You kind of have to pull if open as it is very stubborn. Good luck!

Posted on Jan 12, 2009

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Posted on Jan 02, 2017

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How do you change ink on a canon p20-dh calculator


For accounting offices and stores, calculators that produce a printed paper are indispensable. Canon's desktop or commercial printing calculators use ribbon tape, and you'll need to change the ribbon when it is used up. All Canon desktop and commercial printing calculators use the same method for changing the ribbon.
  • Turn off the calculator.
  • Pull up on the tab on the far side of the printer cover to remove the cover.
  • Pinch together the ribbon lock (the arrow shows you the direction to pinch). Lift the ribbon spools off the shafts and discard them.
  • Separate the new ribbon spools. Guide the ribbon tape around the four guiding pegs and set the spools on the shafts. The spools should be peg side down.
  • Rotate the spools so the peg at the bottom of the spool goes into the hole of the spool holder. Release the ribbon locks.
  • Rotate the spools to make the ribbon taut, keeping the ribbon positioned around the guide pegs.
  • Replace the printer cover and turn the calculator on.
How to Change the Ribbon in Canon Calculator eHow

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Any way to tell me how to ink this machine. It belongs to my church and no one knows how to ink it.


You don't mention the machine, but they have three inking systems.
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There will be a cover you can take off. See what you have?

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Slide the printer cover toward the back of the machine to remove it. Lift out the old ribbon and replace it with the new one by facing the black side of the ribbon up. Secure one of the reels to its reel shaft, thread the ribbon around the outside of the metal guides, and secure the other reel to the opposite reel shaft.

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Remove the paper tape by pulling it back out of the calculator.

Feel along the back of the calculator right below where you insert the paper tape for a ridge. Gently lift up on this ridge and a plate will lift out of the machine exposing the ribbon.

Make a note to yourself as to how the old ribbon is in the machine before removing the old ribbon. Just gently lift straight up on both of the spools and the ribbon will lift out of the machie.

When you insert the new ribbon make sure that the ribbon is feeding off of the back side of both spools. You can use a small screwdriver or toothpick etc to position he new ribbon to keep the ink off of your fingers. Make sure the new ribbon feeds around the plates on both sides of the machine and it fits behind the roller that has all the numbers on it and that the red portion of the ribbon is on the bottom.

Take the plastic plate that you removed first and insert the tabs in the front underneath edge of the case on the front and gently push the back side of the plate straight down till it smaps into place.

Refeed the paper tape back into the machine and you are finished!

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How do I change the ribbon on my casio hr-8tm calculator?


Place the roll on the wire thing at the back (I don't think it matters which way round); push the paper through the slot at the bottom of the back and then (having taken the clear plastic cover off) push it along the bottom inside at the back as far as you can then start to press the feed button; keep feeding it with your finger and pushing the feed button asnd it should pick up eventually.

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Hi...This calculator takes a IR-40T ink roll.
Turn off the power.
Open the top cover,
There is a flat tab on the ink roller, lift up, remove.
Hold the new roller by the tab, line it up in the slot and snap in.
Turn on the power and test.
If it doesn't work you might not have it snapped in properly or all the way.
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Hi there, there are a couple possibilities. First, Remove the cover where the paper feeds out, if there is a ribbon or an ink roller in there it will need replacing. This you can get a staples. The other possibility is, if there is no ribbon or ink roll, it is probably a thermal printer which means is uses a special heat sensitive paper. If this started when you changed the paper, this is most likely the problem. This you can also get at staples!

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