Fuser Thermistor Repairs - using Kapton Tape

Fuser Thermistor Repairs

For MANY models including:

For Xerox® 4110 style (4110, 4112, 4127, 4590, 4594, D95, D110, D125, D136, PrimeLink B9100, B9110, B9125, B9136)

Engineering models:  6204, 6404, 6604, 6605, 6705, 6279

C35 style including families:  (Models): 5890 family (WC-5890, 5875, 5865, 5855, 5845),
5790 family (WC-5790, 5775, 5765, 5755, 5745, 5735, 5730),
5687 family (WC-5687, 5675, 5665, 5655, 5645, 5638, 5632), 
275 family (WC-275, 265, 255, 245, 238, 232, 175, 165, M175, M165, Pro275, Pro265, Pro255, Pro245, Pro238, Pro232),
Pro55 family: (CopyCentre: C35, C45, C55, WorkCentre: M35, M45, M55, Pro35, Pro45, Pro55), 
& DC555 family (DocumentCentre: DC-555, 545, 535, DC555, DC545, DC535) 

When rebuilding or repairing a fuser which has a thermistor (or several) which have the yellow taped head in direct contact with the fuser heat roller's surface, it is a good idea to re-tape the thermistor heads.  This is because when the tape wears out as it often will during the second cycle, damage can result to both the thermistors and the Fuser Heat Roller’s surface. Fresh Kapton Tape will keep the thermistor from harm. 

1.   Release the two Thermistor heads from the assembly (1 screw each).  

2.   Carefully use a utility knife to slice the tape on either side of the Thermistor’s contact face (see photo #2 and 3).  Do not try to remove the tape from the rest of the thermistor… only the part on the face which contacts the Heat Roll’s surface.  Peel off any residual tape on the Thermistor’s contact face (photo #3).  You may want to use a magnifying glass to check your work.  Be very gentle… you do not want to damage the orange spongy pad nor the thermistor’s wires. 
    
3.     Apply new tape to the Thermistor’s head lengthwise (see photos 4-6).  Start it near the base on the side which has the contact face (see photo 4)… put it on nice and evenly, gently pressing it into the corner of the thermistor head (see photo 5) and then wrapping it around the Thermistor’s face, ending at the opposite side of the base (see photo 6).  Use your thumbnail to press the tape to all surfaces thoroughly especially on the contact face. 

4.     Next you will apply a layer of tape in the perpendicular direction (around the base) to keep the first piece of tape better secured.  (See photo #7).  Do not cover the Thermistor’s contact face with a second layer of tape.
    
  

That’s it!  You have given new life to your thermistors so they will last another full fuser life without a problem.  (See photo #10 to see a finished product)

Written by Britt Horvat for our own beloved website: www.partsdrop.com :)