Thermistor Replacement - usi 1800-2700 Owner's Manual

To be performed by competent service technician.
1. Unplug laminator.
2. Remove the four Allen head screws retaining the left side housing. Gently pull left side housing away from left
side frame and set aside.
3. Remove the four Allen head screws retaining the right side housing. Gently pull right side housing away from right
side frame.
4. Mark location of metal/rubber wiring harness retainer. Loosen and remove wiring harness retainer screw. Remove
wiring harness retainer from wiring. NOTE: To keep wires away from moving parts, the wiring harness must be
put back in its proper location-it must be marked before removal.
5. Trace the two heater wires from the lower heatshoe to the terminal block. Mark their locations, then unplug them
from the terminal block. Unplug the black thermistor cable from the digital temperature control board. If there are
any wire ties securing the lower heatshoe/thermistor wiring to any other wiring, mark their locations and carefully
cut them and remove them. Trace the two thermal cut-out wires on the left end of the lower heatshoe to the
terminal block. Mark their location, then unplug them.
6. Loosen and remove the two Allen head cap screws retaining the LEFT end of the heatshoe. Be sure to support the
heatshoe.
7. Loosen and remove the two Allen head cap screws retaining the RIGHT end of the heatshoe. Be sure to support
the heatshoe. Gently remove the heatshoe guiding the wiring out of the holes in the side frame. Carefully cut the
black shrink tubing covering the heatshoe wires and thermistor cable.
8. Locate the thermistor retaining/cover plate located on the rear of the heatshoe. NOTE: That slightly off-center is a
recessed Allen screw. Do not remove this screw, but mark its location so that the thermistor retaining/cover plate
will be oriented correctly upon installation. Loosen and remove the two hex screws located at the ends of the
thermistor retaining/cover plate. Remove thermistor retaining/cover plate. Note orientation of thermistor. The new
thermistor must be mounted in exactly the same location. Proceed to gently pull the thermistor out of its
mounting hole and pull out of heatshoe. Clean out mounting hole.
To install the new thermistor, reverse the above procedure.
NOTE: A small amount of thermally conductive grease needs to be applied to end of the new thermistor before
installation.
NOTE: Be certain that the new thermistor and the thermistor retaining/cover plate are oriented correctly.
NOTE: An appropriately size piece of shrink tubing should be applied over the heater wires and thermistor cable
for protection.
NOTE: Be certain to guide the heater wires/thermistor cable through the hole in the side frame oriented towards
the front of the laminator.
NOTE: Be certain that the wiring harness retainer is oriented correctly to keep the wiring from rubbing on any
moving parts.
NOTE: Be certain to replace any wire ties that were cut and removed during the removal process.
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THERMISTOR REPLACEMENT