 |
|||
|
|
|||
|
Page Title:
T-1054(P)/GRC-144(V) and T-1054 (P)A/GRC-144(V) Troubleshooting Chart-continued |
|
||
| ||||||||||
|
|  TM 11-5820-695-35
Item No.
Symptom
Probable trouble
Corrective actions
and pin 28 of 1A15A8S4A
(fig 5-15)..Note that residence
varies smoothly from zero to
50,000 ohms as potentiometer
1A15A8R3 (fig. 3-4) is varied
from one extreme to the other.
c.
Coaxial circulator 1A10HY1
c.
Check circulator 1A10HY1
defective.
by substitution (para 3-27).
43
Cannot calibrate the AMPL-
a.
Defective wiring
a.
Check for continuity between
MULT section of the T-1054
terminal S of connector
(P)/GRC-144(V) frequency
1A156W27J1 and terminal 1 of
multiplier metering circuit
potentiometer 1A165A8R
(para S9).
b.
Defective component or wire in
b.
Check resistance between terminal
metering circuit.
1 of potentiometer 1A15A8R4
and pin 21 of 1A16ABS4A
(fig. 5-15). Note that resistance
varies monthly from zero to
50,000 ohms as potentiometer
1A15A8R4 (fig. 3-4) is varied
from one extreme to the other.
44
Cannot calibrate the T-1054(P)
a.
100 MHz radio frequency oscilla-
a.
Check 100 MHz radio frequency
/GRC-1 44(V) radio test set
tor 1A2 defective.
oscillator 1A2 by substitution.
(para-61).
b.
Coaxial cable 1A16W24 defective
b.
Check continuity of coaxial cable
1A16W24 (fig. S-18).
c.
Crystal mixer 1A16Z1 defective
c.
Check crystal mixer 1A16Z1 by
substitution (para S-6).
d.
Variable attenuator 1A16A1
d.
Check variable attenuator 1A16AT1
defective.
by substitution (para 8--5).
e.
Coaxial cable 1A15W26 defective
e.
Check coaxial cable 1A15W6 by
substitution (fig. 18).
f.
Coaxial cable between T-1 054(P)
f.
Check coaxial cable by
/GRC-144(V) teat output and
substitution.
coupler, Directional CU-1890,
GRC defective.
g.
Coupler, Directional CU-1890/
g.
Check Coupler, Directional CU-
GRC defective.
18S9/GRC by substitution.
NOTE
Step 45 applies to AN/GRC-144(V) Radio Set only. For Radio Sets AN/GRC-144(V)3 and AN/GRC-144(V)4,
see step 46.
46
Cable loop back test (TM
a.
Coaxial cable 1A15W1 or 1A15W2
a.
Check coaxial cables 1A15W1 and
11-682(}312) indicates
defective.
1A15W2 (fig. -1S) by sub-
that AN/GRC-44 is
stitution, using an external
faulty.
hookup.
b.
Digital data modem chassis
b.
Check digital data modem ca
1A12A12 defective.
1A1A12 by substitution (para
Change 6 3-10.1/(3-10.2 blank)
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals