FIELD REPAIR/SERVICE MICRO-TEMP
®
LT, Model 749
OPERATION AND TECHNICAL MANUAL
Page 52 of 75
L. If new fuses are not needed, keep current fuses in their respective fuse holder.
M. Using a Flat Head screw driver, open the new power tab switch by prying open the
cover.
N. Place fuses with fuse holders into the open area in the power switch.
Note: Make sure arrows on fuse holders correspond with the arrows indicated on the
power switch.
O. Close power switch tab.
P. Insert replacement switch with attached cables into rear enclosure.
Q. Using 7mm nut driver, secure screws with two kepnuts on the inside of the rear
enclosure.
R. Reattach two white heater wires to red 6-position connector.
S. Reconnect power switch cables to control board.
T. Place the following in the order numbered below on the top of the kepnut on the
pump bracket stud:
1. Star washer.
2. Power switch ground wire.
3. Kepnut.
4. Equipment ground terminal ground wire.
5. Heater ground wire.
6. Display ground wire.
7. Alarm enable ground wire (small green wire).
8. Secure with the 6-32” nylon locknut.
U. Check that all cables are still attached to control board before closing unit.
V. Reconnect front and rear enclosure as described in Section (5-2.2).
W. Refill the reservoir as described in Section (4-2.2).
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