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 TM9-4120-423-14&P
1
Visually inspect each heater for obvious damage, deformation, cracked or broken sheath, burnt
out spots and loose, broken, or otherwise damaged leads. Replace if any damage is found.
2
Using a multimeter, check the resistance of each heating element. Resistance should be 67 to 75
ohms. Replace heating elements that do not indicate proper resistance.
3
Using a multimeter, check each heating element for shorts. Check between heater wire and
heater body. No reading should be indicated. Replace heating elements that indicate shorts.
4
Check heater mounting bracket for cracks, breaks, and severe dents. Replace if damaged.
REMOVAL
Heater Assembly
CONNECTOR PLUG
P3 (REF)
ELECTRICAL HEATING
ELEMENTS (15)
WASHERS
*LOCKWASHER
*NUT
HEATER
TERMINALS
(REF)
SCREW (4)
TERMINAL
BRACKET
BOARD TB2
(REF)
* SUPPLIED WITH HEATERS
0021 00-2
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