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TM 55-4920-411-13&P
Table 4-3. Troubleshooting Table, AVIM
NOTE
Use table 4-4 when troubleshooting Signal
Generator Display Boards in conjunction
with this table as applicable. (Also, see
figures 1-1, 4-5, 4-6 and FO-1).
PROBABLE CAUSE
REMEDY
.--..-- --
Open fuse, FUl
Power lamp fails to light when power switch is on.
Replace
(Fig 4-5)
(Para 4-8)
Replace
Defective POWER switch, S1
(Fig 4-5)
Replace
Defective power lamp, DS1
(Fig 4-5)
Repair or
Defective power cable
replace
Defective display/s, DS1, DS2
Replace
SECONDS display does not read 00 when power is
(Fig 4-1)
applied to signal unit.
Replace
C4, R9, Z1-Z5, or Z9 on display
(Para 4-8)
board
(Fig 4-1 and 4-2)
+ 12 vdc or + 5 vdc supply on
Repair
signal generator board T1 or
(Fig 4-7 and
associated components
FO-1)
Replace
START/STOP/RESET
SECONDS display reads 00 when power is applied
(Fig 4-5)
switch, S5
to signal unit but does not proceed to display
seconds  when  START/STOP/RESET  switch  is
Replace
R7 on display board
pressed.
(Fig 4-1 and 4-2)
(Para 4-9)
Replace
Z6-Z9 on display board
(Fig 4-1 and 4-2)
I
Repair
1 MHZ oscillator circuit on
signal generator board
Replace
Z9 on display board
SECONDS display starts running when power is
(Fig 4-1 and 4-2)
applied to signal unit and cannot be reset
Para 4-8)
4-4

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