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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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.
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How to Change the Ribbon in Canon Calculator eHow

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I have done the same exact thing myself. It's not going to be easy. I had to compress the spring by hand. there should be a little cover screwed down covering the spring, carefully remove it. this spring is pretty strong, so if you let it out of the channel its in, it probably going to eject across the room. I don't think theres a specific method, just use ingenuity and force the spring to open up the ring that grabs the oustide of the clutch, and move the mechanism inside to lock it there, then re-cover the spring, line up the 3 notches, and it'll go right back on. Don't be surprised if it takes a little while.

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Got new printwheel.. Don't know how to release the old one!

Can't see the machine very well from here but I assume it's a typewriter. Poor eyesight, see?

First, turn the typewriter OFF, then slide the carrier to the center. Not because of magic, but it makes easier to work that way.
Now lift the cover, remove the ribbon, and on the right side of the solenoid you'll see a little lever.
I think it's the same you use to release the printing head when you're installing a new ribbon.
Press on it again and the old printwheel will just pop right out.

You should see a little elongated hole on the printwheel, so align it with the little stud and press. Gently but firmly.

Of course, reinstall the ribbon, push the assembly towards the platen until it locks in position, close the cover and turn the typewriter ON.

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You can use the below link that will take you to the brother FAQ website. Follow the FAQ to change the ribbon.

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Try these instructions. If you are still unsure, you may need to take it to a service center for cartridge installation:

WARNING: Be careful not to cut yourself on the sharp edges of the metal part shown in the illustration.

1 Push the OPEN button to open the top cover.
2 Remove the stopper from the printing cartridge.


3 Turn the black spool on the right clockwise to tighten the ribbon.

4 Install the printing cartridge by inserting the recessed c5b8824.jpgfirst and placing the cartridge into its four holders.


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