Model MPC-1L, MPC-22, MPC-554
3-6
FM06-038-B
July 2011
To avoid electrical shock or property damage, move the
power switch to OFF and disconnect main circuit
breaker, or unplug cord at wall receptacle.
Checkout:
1. Slide the component panel out as described in the first step
in Section 2-3.
To avoid electrical shock, make connections before
applying power, take reading, and remove power before
removing meter leads. The following checks are per-
formed with the wall circuit breaker closed and the
main power switch in the ON position.
2. Remove the relay cover from the relay.
3. Refer to wiring diagram page 2-9, and with the outputs on,
check across terminal #1 of the appropriate relay and the
neutral wire, N5 at the transformer. If meter shows full
voltage (120V), but heater is not heating, the heater and
liner assembly must be replaced.
The heater is sealed to the liner assembly, so the appropri-
ate liner and heater assembly must be replaced if the heater
is faulty.
Replacement:
4. Using a Phillip’s-head screwdriver, or a #8 Torx socket
(MS01-514), remove the 16 screws around the perimeter
of the enclosure & the 2 screws securing the power cord.
Figure 1.
5. Pull component panel from unit and disconnect the two,
white connectors, and remove component panel from unit.
Figure 2.
6. Pull cabinet enclosure from unit. Figure 3.
3-7. MPC-554 LINER/HEATER
ASSY. REPLACEMENT
Figure 1
Figure 2
Figure 3
