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Table 4-1. Oven Troubleshooting Chart
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TM-5-6640-214-14 Petroleum Base Laboratory Assembly NSN
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MANOMETER - TM-5-6640-214-140120
TM 5-6640-214-14
(b) Carefully erect the sending bulb to a position perpendicular to the diffuser panel. Pull off the reference
dial.
(c) Lay the cabinet on its side.
(d) Remove the screws securing the thermostat to the rear of the oven control panel and disconnect the
electrical connections to the thermostat.
(e) Withdraw the thermostat capillary out through the bottom of the working chamber.
(f) Install the replacement thermostat in the reverse order of the above steps.
CAUTION
Do not crimp or sharply bend the capillary tubing.
(2) Heater bank.
(a) Remove the screws and saddle clamps which hold the sensing bulb of the thermostat in place on the
diffuser panel on the bottom of the working chamber.
(b) Carefully erect the sensing bulb to a position perpendicular to the diffuser panel.
(c) Lay the cabinet on its back and withdraw the capillary from the inside of the working chamber out through
the bottom of the working chamber.
CAUTION
Do not crimp or sharply bend the capillary tubing.
(d) Stand the oven in an upright position and lift out the diffuser panel. Disconnect the electrical connections
from the three bus bars of the heater bank.
(e) Remove the four screws securing the heater to the bottom of the oven, and lift out the heater assembly.
(f) Install the replacement heater in the reverse order of the above steps.
(3) Pilot light and switch. If it becomes necessary to replace the pilot light or switch, lay the oven on its side.
Compress the spring clips at each side of the switch and push out through the front of the oven. Disconnect wires from
the defective part. Make
4-21

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