FIELD REPAIR/SERVICE MICRO-TEMP
®
LT, Model 749
OPERATION AND TECHNICAL MANUAL
Page 56 of 75
E. Remove control board and set aside.
F. Using 7 mm nut driver, remove plastic nut, nylon locknut, internal tooth washer and
ground wire from display board.
G. Pull out display board.
H. Install new display board.
I. Reinstall the left side of the board with internal tooth washer, ground wire, and nylon
locknut. Secure right side of board with plastic nut.
J. Reinstall control board.
K. Secure control board to front enclosure with seven 6-32” Phillips head screws.
Note: Insert the short screw into the hole at the bottom right of the control board (near the
J6 Position of the board).
L. Reattach cables to control board. Refer to Section (5-2.3).
M. Reconnect front and rear enclosure as described in Section (5-2.2).
N. Refill the reservoir as described in Section (4-2.2).
REPLACEMENT OF MEMBRANE PANEL
A. Drain the reservoir as described in Section (4-2.1).
B. Separate the front and rear enclosure as described in Section (5-2.1).
C. Disconnect cables from control board as described in Section (5-2.3)
D. Remove the control board and display board as described above in ”Replacement of
the display board” Steps D – G.
E. Obtain new membrane control panel.
F. Forcefully pull off old membrane control panel.
NOTE: Some force may be required due to adhesive.
G. Remove protective backing from new membrane control panel.
H. Slide ribbon through right hand slot on the front of the front enclosure.
I. Push down on membrane control panel to secure.
J. Reinstall display board.
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