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Parts Replacement
(continued)
Thermo Scientific
3. Microprocessor Controller
See illustration on page 17.
a. Remove "Air Volume Control" knob by unscrewing counterclockwise.
b. Remove "High Limit" thermostat knob using a 5/64" Allen wrench.
c. Remove six screws (8 for Model 645) securing access panel assembly to side
of oven. Remove access panel. Caution: Ground wire attached to access panel!
Ground wire will retain access panel assembly! Be careful when removing
access panel to avoid damaging ground wire!
d. Disconnect two mate and lock connectors (P1 & P2) from rear of control
compartment by compressing tabs and pulling straight out.
e. From inside oven, remove three screws located on the front left edge.
f.
While holding front panel from front side of oven, remove two screws located
between door and front panel. Remove front panel/control panel assembly.
g. Remove the six #8 SEM nuts (8 for Model 645) securing control panel
assembly to front panel.
h. Set control panel assembly face down, being careful not to damage the
controller (protecting the front side is recommended - i.e. bubble wrap).
i.
Disassemble the
control panel housing
by removing five
screws; two on top,
three on side. Remove
"L" shaped cover.
j.
Detach terminals,
noting their location
(see page 22 for
proper connections).
k. Remove the two sleeve
mounting brackets located on
top and bottom of the
controller sleeve by
unscrewing threaded shafts
and pressing down on the
bracket. See Figure 6-1.
l.
Slide controller forward
through the front of the
control panel.
m. Reverse this procedure to
replace controller.
Maintenance Section 6
Figure 6-1. Brackets
Freas Safety Oven
6-3
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