Thermo Scientific TRACE 1600 Hardware Manual page 270

5
GC Main Frame Advanced Maintenance
Replacing the Oven Motor
238 TRACE 1600/1610 Hardware Manual
c. Install the motor on the studs.
d. Place the remaining three shoulder washers over the studs, mating them with the
grommets and the blower motor mounting bracket.
e. Place the three flat washers over the studs and against the shoulder washers.
f. Carefully screw the locking nuts back onto the studs, after all of the washers are in
place.
g. Tighten the locking nuts until the grommets are flat. Loosen each locking nut by one
complete turn.
h. Attach the ground wire to the grounding terminal on the back oven wall. Secure it
with the locking nut.
i. Connect the blower motor electrical plug to J7.
11. Reassemble the remaining components on the back of the GC in the reverse order in
which they were removed.
12. Reinstall the blower fan onto the shaft.
a. The fan should be even with the beveled edge on the motor shaft. The motor shaft
should not extend more than 3 mm beyond the blower fan.
b. Secure the fan to the motor shaft using the M4 Allen wrench. Be sure that the
setscrew is in place on the flat side of the blower motor shaft.
13. Replace the oven heater baffle in the reverse order in which it was removed.
a. Guide the heater and temperature sensor wires through the pipes provided on the
oven back wall.
b. Reconnect the temperature sensor and heater wires to the relevant connector J4, J23,
J24, and J25 on the backplane board.
c. Plug the pipes with the insulation material.
d. Secure the oven heater baffle to the oven wall with the four Torx screws in the tabs.
The tab adjustment screws should be loose. Carefully center the oven heater baffle
inside of the oven. Be sure that the center hole in the oven heater baffle screen is
centered over the blower motor shaft. The tolerance is very small. The oven heater
baffle will not move left or right, nor up or down more than a couple of millimeters.
However, be sure that it is centered in the oven over the blower wheel. This will
ensure that whenever the GC is turned on, the blower wheel will not be touching the
heater element mounted to the oven heater baffle.
14. Reinstall the back cover.
a. Reconnect the ground wire to the back cover terminal.
b. Replace the cover proceeding in the reverse order in which it was removed.
15. If external modules are present, plug the power cable to the AC Input connector of each
external module, and to the wall outlet.
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