TM-9-2320-280-20-2

TRUCK, UTILITY: M998 SERIES

TECHNICAL MANUAL; UNIT MAINTENANCE; VOLUME 2 OF 3

JANUARY 1996
TM-9-2320-280-20-2

  TM-9-2320-280-20-2 - Page 546 of 951

4-124. NBC CONTROL PANEL REPLACEMENT (Cont’d)
5.
Remove two screws (12), lockwashers (13), and leads 782A (14) and 783 (16) from NBC control
panel circuit breaker (15). Discard lockwashers (13).
6.
Remove plain-assembled nut (11), diode (24), and leads 783A (17) and 783B (18) from NBC control
panel relay (19). Discard plain-assembled nut (11).
TM 9-2320-280-20-2
4-300
Change 3
NOTE
M996 and M996A1 ambulances have three leads, 785, 786, and
787, on NBC control panel relay.
NOTE
• For M997, M997A1 and M997A2 ambulances, perform steps 10
through 16 for removal of leads from NBC fuse block.
• For M996 and M996A1 ambulances, perform steps 17 through
21 for removal of leads from NBC fuse block.
• Leads 787, 784, and 786 have two way jumpers connecting fuses
for heaters 4 & 5, 6 & 7, and 2 & 3 respectively.
7.
Remove nut (5), lockwasher (6), and leads 784 (7), 787 (8) 785 (9), and 786 (10) from NBC control
panel relay (19). Discard lockwasher (6).
8.
Remove nut (22), lockwasher (23), and leads 782 (21) and 782A (20) from NBC control panel relay
(19). Discard lockwasher (23).
9.
Remove plain-assembled nut (25), leads 795 (3), 796 (4), and 793 (2), and diode (24) from NBC
control panel relay ground (1). Discard plain-assembled nut (25).
CAUTION
Use care when removing lead clips from NBC control panel fuse
block to prevent damage to leads, wire clips, and/or fuse block.
10.
Remove leads 787B (26) and 787 (8) from NBC fuse block (31) for heater fuse #4.
11.
Remove lead 787A (27) from NBC fuse block (31) for heater fuse #5.
12.
Remove leads 784 (30) and 784B (28) from NBC fuse block (31) for heater fuse #6.
13.
Remove lead 784A (29) from NBC fuse block (31) for heater fuse #7.
14.
Remove leads 785A (9) and 785 (34) from NBC fuse block (31) for heater fuse #1.
15.
Remove lead 786A (33) from NBC fuse block (31) for heater fuse #2.
16.
Remove lead 786 (32) and lead 786B (10) from NBC fuse block (31) for heater fuse #3.


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