FIELD REPAIR/SERVICE MICRO-TEMP
®
LT, Model 749
OPERATION AND TECHNICAL MANUAL
Page 51 of 75
O. Reposition heater mounting plate on reservoir. Align Water Sensor Screw on Heater
Plate with top of reservoir. Secure by twisting on the heater cap.
P. Reposition reservoir back into rear enclosure.
Q. Reinsert the pump connecting hose to the output hole of the heater plate and tighten
hose clamp.
R. Reconnect cables to control board.
S. Check that all cables are still attached to control board before closing unit.
T. Reconnect front and rear enclosure as described in Section (5-2.2).
U. Refill the reservoir as described in Section (4-2.2).
5-8. REPLACEMENT OF THE I/O POWER SWITCH
A. Obtain the replacement I/O power switch.
B. Drain reservoir as described in Section (4-2-1).
C. Separate front and rear enclosure. Refer to Section (5-2.2).
D. Using 5/16” nut driver, unscrew the 6-32” nylon locknut from enclosure bracket and
remove all ground wires including first kepnut from bracket.
E. Disconnect J6 position connector and J7 position connector from control board.
F. On the red 6-position connector remove the two white heater wires with pin pusher.
G. Unscrew the two kepnuts that secure the power switch on the inside of the rear
enclosure with a 7mm nut driver.
H. Remove the power switch and attached cables to the outside of the unit.
I. Using a Flat Head screw driver, open the fuse housing area on the power switch
assembly by prying open the cover.
J. Remove the fuse holders and fuses from the power switch assembly.
K. If needed, obtain 2 new fuses for the new power switch assembly. Remove the old
fuses and place each of the new fuses inside a respective fuse holder.
Always unplug the unit before accessing internal components during service. Failure to
unplug the unit could result in electric shock.
For continued protection against risk of fire, replace only with same type and rating of fuse.
Electrical hazards may result.
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