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Page Title:
Relay and Mode Control Tests-continued |
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|  TM 11-5820-509-35
Item
Indication
Probable trouble
Procedure
c.
PA filter box circuit defective.
c.
Check continuity from FL2-12
to FL2-25 and from FL2-16 to
FL2-3: check each terminal for
shorts to ground. Repair circuit
or replace C28, C202, C213,
C215, C226, C227, C237, L202,
or L211 (para 3-9).
d.
PA overtemperature cutout
d.
Check continuity across R103.
and/or override circuit defective.
If open, permit unit to cool
thoroughly 115 to 20 minutes,
and retest. Replace K103 if
circuit remains open (para 3-9).
Check continuity from S3B
(COM) to S3B (NO) with
BATTERY TEST switch
pressed. Replace if circuit
remains open. Check continuity
from S2 (COM) to S2 (NO) with
CW-FSK/VOICE twitch to CW-
FSK. Replace S2 if circuit
remains open (pare 3-91.
e.
Push-to-talk relay A5K1 in
e.
Check continuity from J1-11 to
power supply A5 defective.
J1-22 Normal 300 ohms), replace
A5K1 if winding open (para 3-
13d ).
f.
Vox relay A1K1 in audio
f.
Check continuity from A1K1-3
frequency amplifier A1 defective.
to A1K1-5 (fig. 3-68): repair
AM-3506/PRC-47 (para 3-13a)
or replace defective module.
g.
Vox circuit in audio frequency
f.
Check continuity from J2-11 to
amplifier A1 defective.
A1K1-3 and from J2-5 to A1K1-
5: measure dc volts from J2-7 to
ground with ptt switch pressed.
Repair AM-3506/PRC-47 (para
module.
h.
Vox circuit or, main chassis
h.
Check continuity from Jl-20 to
defective.
J2-7, to J4-4, to K3-1, to K4-1,
to K5-1, to FL2-8. Also from
FL2-21 to R120-1, to t/r relay
K101 coil. Repair defective
circuit.
i.
Defective ground circuit or
i.
Measure resistance to ground as
operating coil in a relay.
follows: K3-1 (normal 1628
ohms); K4-1 (normal 1628
ohms): K5-1 (normal 725 ohms);
K101 (C) (normal 270 ohms);
K102-1 ( normal 684 ohm - );
check C145 for abort to ground.
Measure resistance of R120
(normal 470 ohms} and verify
that the following pins are
grounded: J1-6, J1-7, J1-12, J2-
1, J2-2, J2-3, J3-4, J4-2, J6-1,
J7-5, J8-2, J9-3, J11-2. Repair
defective circuit or replace faulty
component.
j.
Transmit relay A21C1 in am-
j.
Check winding of relay from J4-
plifier-modulator A2 defective.
to J4-2 (normal 1K ohms);
repair AM-3507/PRC-47 (para 3-
13b ) or replace defective
module. Check C2 (on main
chassis) for short to ground.
Verify that R45 (normal 680
ohms) is not open; replace
defective component.
3-86
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