Thermistor Replacement - usi CSL2700 Owner's Manual

tHErmIStor rEPlacEmEnt

1. Unplug the laminator from power supply and allow it to cool to room temperature. Caution: never attempt to
service a machine that is energized!
2. Remove the thermometer and temperature adjustment knob. Note: the temperature adjustment knob is
retained by an Allen set screw located along the outer edge of the knob, do not try to remove the knob
without first loosening the set screw; putting excess force on the knob by pulling can damage the
temperature control.
3. Remove the both the left and right side housings by removing four Allen head screws on the side of the machine
using a 3mm Allen wrench and then pulling the cover off gently.
4. Mark the 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 retainer must be put back in its proper location---it must be marked before removal.
5. Trace the two heater wires and the two thermal fuse wires from the right end of the lower heatshoe to the
terminal block. Mark their locations, and then unplug them from the terminal block. Unplug the thermistor
cable from the digital temperature control board. NOTE: 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.
6. While supporting the heatshoe loosen and remove the two Allen head cap screws and spacers retaining the
LEFT end of the heatshoe.
7. Continue supporting the heatshoe and loosen and remove the two Allen head shoulder screws retaining the
RIGHT end of the heatshoe. Gently remove the heatshoe guiding the wiring out of the holes in the side frame.
8. Locate the thermistor retaining bracket located on the right end of the heatshoe near the heater wires. Loosen
and remove the screw retaining the bracket. Remove thermistor assembly from the heatshoe. Be certain to
note the orientation of thermistor. The new thermistor must be mounted in exactly the same location.
9. Clean out the thermistor mounting hole.
10. To install the new thermistor, reverse the above procedure. Note: A small amount of thermally conductive
grease needs to be applied in the thermistor mounting hole before inserting the new thermistor. Also,
be certain that the new thermistor and the retaining bracket are oriented correctly.
11. When reinstalling the lower heatshoe, be certain to guide the heater/thermal fuse wires/thermistor cable
through the proper holes in the side frame and check to ensure that the wiring harness retainer is oriented
correctly to keep the wiring from rubbing on any moving parts.
12. Before reinstalling the side housings replace any wire ties that were cut or disturbed during the repair
procedure. Also be certain that all tools and service supplies are removed from the inside of the laminator.
13. Test run the laminator: allow the machine ample time to heat to the set temperature and stabilize; usually
35-45 minutes. Ensure that the unit is not exceeding 310˚F when the temperature control is set to the
maximum temperature setting.
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