Isotemp Economy Incubators Page 14
Caution:
Service procedures requiring access to the electronics
compartment involve exposure to line voltage and
should be done by qualified service personnel.
Disconnect incubator from power before attempting
Repairs.
Replacing
To replace a defective control thermocouple, proceed as follows:
the Control
Thermocouple
1. Complete the procedures discussed in
Accessing the Electronics
Compartment.
2.
Remove thermocouple wires from 2-terminal connector on circuit
board by loosening two securing screws.
Observe position in terminal for each lead.
Note:
When re-connecting, be certain to observe polarity.
Compare with polarity indication on
controller housing. For thermocouples, the red wire is
negative and yellow positive.
3.
On lower back wall of incubator, locate two clips which hold the
thermocouple in place. Remove thermocouple from clip.
4.
Pull defective thermocouple forward into incubator chamber,
exposing roughly a 6-inch section of the thermocouple wire.
5. Cut the thermocouple wire to remove the thermocouple sheath.
6. Securely loop together the cut end of the defective thermocouple
with the two leads of the replacement thermocouple. Wrap masking
tape over the length of the loops to secure them.
7. Gently pull the defective thermocouple out through the electronics
compartment while guiding (“fishing”) the replacement
thermocouple into place.
8.
Generally reverse the above steps to complete installation of new
thermocouple and reassemble incubator.
9. Align thermocouple in clips such that tip of thermocouple sheath is
positioned over the edge of the third hold in the heater cover,
counting from the left.
Summary of Contents for Isotemp 500 Series
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