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How to remove T4 error without calling service on RISO 3770

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That is an ink overflow error the only way that you could fix this is to replace the drum. You could open the current drum and clean out the excess ink but I don;t recomend that. If you don;t use Riso brand ink you will have this same problem again. It cost more but it is worth the cost to prevent this problem.

Posted on Jul 17, 2010

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Do not attempt this unless your skill level is. Higher than average and you dont mind getting very dirty. This is for rz and ez, other models are similar but have some differences, especially in the pump area. Get surgical gloves to wear, news paper or rags to lay underneath the open drum area, a plastic spoon or spork, more rags and isopropyl alcohol. Pull the drum out, use a Phillips to remove the four screws holding the master clamp in place. Remove clamp. Remove ink bottle, remove the little tabbed access door in side the ink tube. Remove the screen. Cut the tape holding the two ends of the drum screen together along the screen edges. (Not totally necessary to replace but if you're of the mind to use heavy threaded masking toe or duct tape of the same size) now, remove some, but not all the screws starting from the edge. (If you remove all the screws it's a pain to realign the drum body as the ends are balanced separately) until you can carefully open it enoughto get access to the pump. remove the pump by taking two screws out of its base and disconnecting the the wires. Be sure to reattach everything on reassembly. Disconnect the rf antennae lead from back of drum. Remove four to six screws holding plastic plate in place. This gives access to the squeegee area and the ink overflow sensor.you may want to remove the ink over flow sensor at this time. It's a little circuit board with two straight pieces of almost paper clip looking antennae beneath it, one longer one short. Do NOT bend or break antennae. Clean with isopropyl alcohol and a rag. Using the spoon or spork, remove all of the large bead of ink from the squeegee roller. Clean with isopropyl alcohol and rags. Reverse order to reassemble. Be SURE to get the screen tight and unwrinkled. I recommend going into test mode and reinking the machine from there. The code varies on some models so you can just make a master 1/2 inch from all edges using something dark to cover most of the trailing 3/4 of a page. Run copies till inking is clean and solid. You may see a few ink empty errors while inking. Pull the drum out push in and reset to clear. If this error persists after you're getting clean copies, or you're still getting an over/under flow error you will need to replace the overflow sensor.

Posted on Apr 13, 2014

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Posted on Jan 02, 2017

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SOURCE: Code Error T4

T-4 is an ink overflow condition. You may need to check and clean out ink section of drum. Remove the ink then press reset button. Then turn off and on and re-insert ink.

Posted on Dec 02, 2008

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