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Page Title:
Isolating Trouble Within a Stage |
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|  Input microvolts
Isolating procedure
Test point
(mc)
RT-441/TRC-68
RT-323/VRC-24
Check V401 and make voltage-resis-
J402 (fig. 56)
3.9
35-80
35-60
tance measurements to isolate
trouble.
Check V303 and make voltage-resis-
35-70
35-100
3.9
J303 (fig. 62)
tance measurements to isolate
trouble.
Check V305 and make resistance-
38-76
40-85
29.9
J303 (fig. 62)
voltage measurements to isolate
trouble.
20-38
Check V302 and make voltage-
29.9
20-45
J302 (fig. 62)
resistance measurements to isolate
trouble.
4-8
Check V301 and make voltage-
4.5-10
29.9
J301 (fig. 62)
resistance measurements to isolate
trouble.
Caution: Before keying the trans-
mitter, disconnect the TS-497/URR
and connect the AN/URM-43A to the
ANT jack.
2.5-4.5
Check bias at J106 (fig. 68 and 85). If
2.5-4.5
399.9
ANT. jack (front panel)
normal, go to transmit operation and
(typical)
(typical)
(use TS-497/U)
check tuning of rf amplifiers (para
6 maximum
6 maximum
substitution. If tubes are good, plug
in test socket adapter and make
voltage-resistance
measurements.
If bias at J106 is abnormal, go to
transmit operation and check bias at
J104 (para 97).
If signal is abnormal, trace the uhf
injection subunit (para 97) to
isolate trouble. If bias at J104 is
normal, go to transmit operation.
Check tuning of rf amplifier and
the rf amplifier stages V102, V103
and V104 (para 137).
and relay coils in paragraph 105.
d. If signals are weak and all checks
W h e n t r o u b l e h a s been localized to a
fail to indicate a defective part, check the
stage, use the following techniques to iso-
alignment (para 128 through 141).
late the defective part.
e. U s e t h e p a r t i a l s c h e m a t i c d i a g r a m s
a. Test the tube involved either in Tube
to circuit-trace and isolate the faulty com-
Tester TV-7/U or by substituting a simi-
ponent.
lar type tube which is known to be oper-
ating normally.
b. Take voltage measurements at the
Relay Coils
tube sockets (fig. 83 through 89) to isolate
open and short circuits.
The dc resistances of the transformer
c. I f v o l t a g e r e a d i n g s a r e a b n o r m a l ,
windings and the relay coils in the re-
take resistance readings (fig.83 through
ceiver-transmitter are listed below. Re-
89) to isolate open and short circuits. Refer
lay resistances must be measured with
also to the dc resistances of transformers
the relays disconnected.
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