TM 11-5820-803-12
SECTION II. MAINTENANCE ALLOCATION CHART
FOR
MODEM, DIGITAL DATA - PHASE SHIFT KEYING MD-921/G
(1)
(2)
(3)
(4)
(5)
MAINTENANCE CATEGORY
TOOLS AND
GROUP
COMPONENT/
MAINTENANCE
EQUIPMENT
L12
CODE
ASSEMBLY
FUNCTION
C
O
F
D
00
Modem, Digital-Phase Shift
Inspect
0.1
Test 1
0.1
Keying MD-921/G
Test 2
0.2
22,24
Test 3
0.1
20
Service
0.1
Align
1.5
9,13,15,
22,23,33
Install
1.0
15,25
Replace
1.5
15,25
Repair 4
0.1
25
Repair 5
0.1
17,25
Overhaul
24.0
1-43
01
Control Panel, A1
Inspect
0.1
Test 6
0.1
Test 7
0.1
20
Service
0.1
Repair 8
0.1
Repair 9
0.1
25
Repair 10
0.2
25
0101
Switch Assembly, A1A1
Inspect
0.1
Test
0.1
20
Replace
0.1
25
Repair
0.2
25
0102
Switch Assembly, A1A2
(same as FGC group 0101)
02
Modem Subassembly, A2
Inspect
0.1
Test
0.8
20
Repair 11
0.1
17,25
(1)
Self-test
(8)
By replacement of fuses and indicators
(2)
Operational noise test
(9)
By replacement of switches (except A1S5),
(3)
Self-test, external continuity checks
sockets, and meter
(4)
Minor soldering operations
(10)
By replacement of switch A1S5
(5)
By replacement of subassemblies
(11)
By replacement of subassemblies including
(6)
Lamp test
nonrepairable components AT1 J1, AT2J2,
(7)
Continuity checks
A1FL1, K1, Y1, and Y2.
(7.1)
Repair per next higher assembly 0205-
(12)
See paragraph C-3d
Change 1 C-3
