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Page Title:
R-1467(P)/GRC-144(V) and R-1467(P)A/-GRC-144(V) Troubleshooting Chart-continued |
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|  TM 11-5820-695-35
Item No.
Symptom
Probable trouble
Corrective actions
25 (Meter indication for LOCAL
a.
Meter calibration required
a.
Perform the R-1467/GRC-144
OSC POWER meter selector
local oscillator metering circuits -
switch position not in
calibration procedure (para-65).
yellow band.
b.
Defective wiring or component
b.
Turn meter selector switch on
in local oscillator circuits.
Meter panel assembly 2A15A2 to
FREQ MIXER CURRENT 1 mad
2, If either meter indication is
not in the yellow band, perform
the corrective action given for
Item No. 17 in this chart
c.
Defective wiring in plate assembly
c.
Perform the plate assembly 2A16
2A16.
checks (para f-16c, section 1).
d.
Coaxial cable 2W8 or 2W9
d.
Check coaxial cables 2W8 and
defective.
2W9 (fig. 342) by substitution.
e.
Local oscillator bandpass filter
e.
Replace local oscillator bandpass
2F16 defective.
filter 2FL6 (para 3-46).
26 200 MHz frequency multi-
a.
Defective wiring in plate assembly
a.
Perform the plate assembly 2A16
plier-osc 2A13 frequency
2A16.
checks (para 6-1&c, section 5).
error greater than 20 kHz
b.
220 MHz frequency multiplier
as determined by test
-osc 2A13 defective.
plier-osc 2A13 (TM 11-20-
695-12)
27 Electrical frequency synthe-
a.
Defective wiring in electrical equip-
a.
Perform the electrical equipment
sizer 2A14 frequency error
ment cabinet 2A15.
cabinet 2A165 checks (para
greater than 3 kHz as
3-17c, section 3).
determined by test (para
b.
Defective plug-in component in
b.
One at a time, replace each plug-in
3-73).
electrical frequency synthesizer
component (2A14A1 through
2A14.
2A14A7) in electrical frequency
synthesizer 2A114 (TM 11-5 695-
12).
c.
Electrical equipment chassis
c.
Replace electrical Equipment
2A14A10 defective.
chassis 2A14A10 (para 3-49).
28 Local oscillator output power
Same as item No. 26 in this chart
Perform the corrective action given
less than 0.4 milli-
for item No. 25 in this chart.
watts as determined
by test (para 3-74).
29 R-1467/GRC-144 if gain
a.
70 MHz intermediate frequency
a.
Check 70 MHz intermediate fre-
less than 150 as determined
amplifier 2A5 defective.
quency amplifier 2A5 by sub
by test (Para 3-76).
stitution (TM 116820-895-12).
b.
Amplifier mixer 2A7 defective
b. Check amplifier mixer 2A7 by
substitution (TM 11-5820-695-12).
c.
Tunnel diode amplifier 2A2
defective.
by substitution (TM i11 16820-
665-12).
d.
Same as item No. 13 in this chart
d. Perform the corrective action given
for item No. 13 in this chart
30 R-1467/GRC-144 carrier
R-1467/GRC-144 carrier alarm
Perform the R-1467/GRC-144 carrier
alarm trip point not in
adjustment required.
alarm adjustment procedure (para
tolerance as determined by
3-6).
test (para 3-75).
31 Cannot calibrate the R-
Defective component or wire in
Remove alarm monitor 2A12 (TM 11-
1467/GRC-144 traffic
metering circuit
5820-495-12) and check resistance
metering circuit (para
between pin 12 of connector 2A16W-
3-64).
1XA12A and pin 25 of 2A15A2S1B
smoothly from zero to 5,000 ohms as
potentiometer 2A15A2R7 (fig. 8-18)
is varied from one extreme to the
other. Also check for continuity
between pin 25 of 2A16A2S1B and
the E2 CAB GRD lug on top of A15.
Change 3 3-24
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