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Remove the paper scroll from the printer. Turn off the power and make sure the print wheel has stopped moving.
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.
Tighten any slack ribbon by turning one of the reels
Replace the print cover and reset the paper scroll.
From your description the problem is in the on/off switch of the calculator, the switch really needs to be replaced, if that is not an option the device needs to be dis-assembled and the switch flushed with electronic cleaning spray inside the switch contacts and slide it back forth to clean the points "two or three good burst of solution" in most cases this will fix the problem. I do not recommend leaving the calculator on all the time because of a potential fire hazard.
Make sure the calculator is turned off. Press down and outward on the battery compartment cover until it slides off. Turn the calculator over and shake the batteries out. Insert the new batteries, orienting them according to the diagram inside. Slide the cover back into the slot.
Helloooo .. There is a switch located above the keyboard labled IC for item count...slide the switch to the on position and as you add a number will appear on the paper tape on the other side of the total. On some units it will appear on the Display also. I hope this solves you problem. Squipps