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Page Title:
T-1054(P)/GRC-144(V) and T-1054 (P)A/GRC-144(V) Troubleshooting Chart-continued |
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|  TM 11-5820-695-35
Item No.
Symptom
Probable trouble
Corrective actions
39 Cannot calibrate the T-
a. Defective wiring
a.
Remove alarm monitor 1A6 (TM
1054/GRC-144 rf power
11-820695-12) and check
metering circuit (para
for continuity between pin 2 of
3-67).
Connector 1A16W26XA6B and
the center conductor of coaxial
cable 1A16W22P1 (fig. 5-15).
b.
Defective component or wire in
b.
Check resistance between pin 4
metering circuit.
of connector 1A16W25XA6B and
the E1 CABINET GROUND lug
on top of 1A1 (fig. 5-15). Note
that resistance varies smoothly
from zero to 5600 ohms as
potentiometer 1A15-A8R6 (fig. 3-
4) is varied from one extreme to
the other. Make the same
resistance check between pin 4
of connector 1A16W25XACB
and pin 27 of 1A16A8S4B.
c.
Directional coupler 1DC1 defective
c.
Check directional coupler 1DC1
by substitution (para 3-36).
40
Cannot calibrate the T-
a.
Defective wiring
a.
Remove alarm monitor 1A6 (TM
1054/GRC-144 reflected
11-5820-695-12) and check for
rf power metering circuit
continuity between pin 14 of -
connector 1A16W25XA5B and
the center conductor of coaxial
cable 1A16W23P1 (fig 5-15).
b.
Defective component or wire in
b.
Check resistance between pin 15
metering circuit.
of connector 1A16W25XA5B and
the E1 CABINET GROUND
lug on top of 1A1 (fig. 5-15).
Note that resistance varies
smoothly from zero to 5,000
ohms as potentiometer 1A15A-
8R5 (fig. 3-4) is varied from
one extreme to the other. Make
the same resistance check
between pin 16 of connector
1A16W25XASB and pin 29
of 1A15A8S4B.
c.
Directional coupler 1DC1
c.
Check directional coupler 1DC1
defective.
by substitution (para 3-36).
41
Cannot calibrate the 3RD
a.
Defective wiring
Check for continuity between
MULT (LOCAL OSC)
terminal U of connector
section of the T-1054/
1A15W27J1 and terminal 1 of
GRC-144 frequency multi-
potentiometer 1A15A8R2 (fig.
plier metering circuits
5-15).
b.
Defective component or wire in
b.
Check resistance between terminal
metering circuit.
1 of potentiometer 1A15A8R2
and pin 26 of 1A15A8S4A
(fig. 5-15). Note that resist-
ance varies smoothly from zero
to 50,000 ohms as potentiometer
1A15A8R2 (fig. 3-4) is varied
from one extreme to the other.
c.
Coaxial circulator 1A9HY1
c.
Check coaxial circulator 1A9HY1
defective.
by substitution (para 3-26).
42
Cannot calibrate the 2ND
a.
Defective wiring
a.
Check for continuity between
MULT section of the T-
terminal T of connector
1054/GRC-144 frequency
1A15W27J1 and terminal 1 of
multiplier metering cir-
potentiometer 1A15A8R3 (fig.
cuits (para 3-59).
5-15).
b.
Defective component or wire in
b.
Check resistance between terminal
metering circuit.
1 of potentiometer 1A15A8R3
3-10
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