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6 - Maintenance
` . . 6 . 3 . 3 . 9 Heater
The heater is located in the left electronics compartment near the top of the
instrument.To replace the heater, follow the steps below and refer to Figure 43.
The thermal over-temperature switch is a manual reset type.This switch should
only operate in an abnormal condition. It is rated for
10
cycles of operation.
Required Materials
5/i6" Nut Driver
To Replace the Heater
1 R e m o v e the rear cabinet shell as described in Section 6.3.3.1.
2 D i s c o n n e c t the heater cable from its connection on the chassis upright.
3 R e m o v e the four 5/16" nuts that hold the assembly to the blower duct work.
4 W h e n removing the heater assembly, be sure the insulation clears the top
sheet metal.
5 Tr a n s f e r the cable from the old assembly to the new heater, one connection
at a time. Note that the black wire is an internal connection and does not
have to be disconnected. Be sure you connect the yellow wire to the lower
left terminal, the orange wire to the terminal on the reset button, and the
green/yellow (ground) wire to the bottom right stud. Note that the extra
hardware attaching the ground wire should be placed, from front to rear:
external star washer, the ground wire's ring lug, the flat washer, and the lock
washer.
6 T o replace the heater, insert in with the widest part downward. Replace the
four nuts. Plug the cable back into the chassis upright connector.
MA-0105-3
87
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