TM 11-5805-424-15/NAVELEX 0967-220-9010/TO 31W2-2G-41
Item
Trouble symptom
Probable trouble
Checks and corrective measure
No.
10
Receive data applied from MD-
Defective assembly A11
Replace assembly A11.
674(P)/G normally, but external
no transition receive alarm is
lighted.
11
Receive data applied from MD-
Defective assembly A9
Replace assembly A9.
674(P)/G normally, but external
receive carrier alarm is lighted.
12
Receive bit-timing signals not
Defective assembly A5
Replace assembly A5.
available, but MD-674(P)/G
operates normally in all other
respects.
13
Receive data cannot be regener-
Defective assembly A11
Replace assembly A11.
ated, but bit-timing signals are
normal.
14
No receive data applied from MD-
Defective assembly A3 or A4
Check for square-wave output at test
674(P)/G, receive bit-timing
jack J1 on assembly A4; if not pres-
signals not available, but trans-
ent, replace assembly A3; if present,
mit bit-timing signals are avail-
replace assembly A4.
able.
15
No receive data applied from
Defective OA-8072/G module or
If internal crystal oscillator is used,
MD-674(P) /G and no bit-
printed-circuit card, or assembly
check for timing signals at test
timing signals available.
A1 or A2.
jacks J1 and J2 on assembly
A33A2. If .not present at J1, replace
assembly A33A1 (para 4-6). If
present at J1 but not at J2,
replace assembly A33A2. Check
for timing signals at test jacks J1
and J2 on assembly A2; if not
present at J1, replace assembly
A1; if present at J1, but not at
J2, replace assembly A2.
16
Order-wire circuit operation can-
Defective assembly A3
Replace assembly A3.
not be initiated; all other modes
of operation are normal.
17
Order-wire circuit operation can-
Defective assembly A10
Replace assembly A10.
not be detected; all other modes
of operation are normal.
18
TALK REQUEST indicator does
Defective indicator lamp
Check and replace lamp.
not light during normal order-
wire circuit operation.
19
Common ALARM indicator lamp
a. Defective indicator lamp
a. Check and replace lamp.
does not light during normal
b. Defective assembly A12
b. Replace assembly A12.
alarm condition.
4-6. Replacement of Parts
(1) The power supply submodule (fig. 1-5) and the
MX-73(*)/G module (fig. 1-6) are plug-in
a. Modules.
modules that are secured with quick-release
fasteners. To remove either module, loosen the
quick-release fasteners and pull the module
Caution:
When
removing
or
straight out from the chassis. To replace either
replacing the power supply module,
module, properly align the module, insert it into
be careful not to damage the rfi
the fasteners.
honeycomb air filter mounted on the
(2) The OA-8072/G module (fig. 14) is secured with
rear of the front panel.
hexagonal nuts.
To remove the module,
remove the hexagonal nuts
Change 5
4-6
