TM 9-4520-272-14&P
FIELD (UNIT) MAINTENANCE
LARGE CAPACITY FIELD HEATER (LCFH)
NSN 4520-01-500-1534
MAIN PRINTED CIRCUIT BOARD BOX
REPLACE
INITIAL SETUP:
Tools
Personnel Required
Tool Kit, General Mechanics (Item 2, WP 0092
MOS 63J or 52C
Materials/Parts
Equipment Condition
Tags, marking (Item 5, WP 0119 00)
Heater shut down and cool.
Engine bay access door open.
Main battery switch OFF and handle removed.
REPLACE
1. Tag the two cables (1, 2), two wire harnesses (3, 4), and air tube (5) that connect to the main printed
circuit board box (6).
2. Remove the main wire harness connector (3) by first removing the hex head screw (9) that secures
the two halves of the connector.
3. Remove remaining harness connector (4), two cables (1, 2), and air tube (5) from sides and bottom of
main printed circuit board box (6).
4. Remove the four bolts and lockwashers (7) that secure the main printed circuit board box (6) to the
main cabinet (8).
5. Remove the main printed circuit board box (6) from the cabinet (8).
6. Install a new main printed circuit board box (6) in position in the cabinet (8) and align the four holes
on the box with those on the cabinet. Secure with four bolts and lockwashers (7). Tighten securely.
7. Install the main wire harness connector (3) by installing the hex head screw (9) that secures the two
halves of the connector.
8. Install the two cables (1,2), remaining harness connector (4), and air tube (5) that connect to the
sides and bottom of the main printed circuit board box (6) as tagged earlier.
0063 00-1
