TM 11-6625-441-34
tacts A2 and A3 of relay K1 to OUTPUT MTR
TER, and EMER of S4; EMER position is only
jack J4, or contacts B2 and B3 of relay K1 to
applicable to Test Set. Radio TS-1588A/AIC)
HDST MIC jack J7 for monitoring.
undergoing testing. The headset high output
NOTE
from the interphone control (terminal 5 of J1) is
The procedure in e below can only be
applied through contact R (receive) of OUTPUT
SEL switch S2 and to contact 2 of SIGNAL
performed using Test Set, Radio TS-
1588A/AIC.
switch S6. With SIGNAL switch S6 in the spring
loaded METER position, the audio high output
e. When testing the emergency receiver audio
signal is applied across contacts A2 and A3 of
circuitry of the interphone control, INPUT SEL
switch S3 is placed in the R (receive) position and
relay K1 to OUTPUT MTR jack J4, and to the
RECEIVER SEL switch S4 is placed in the
output meter which monitors the audio output
EMER position. The audio signal developed
signal of headset amplifier A2. When SIGNAL
switch S6 is placed in the HD MIC position, the
across load resistor R3 is applied to the wiper
audio output signal of headset amplifier A2 is
contact of RECEIVER SEL switch S4 through
applied to HDST MIC jack J7 through contacts
the EMER position to the emergency receiver
B2 and B3 to relay K1.
audio line (terminal 27 of J1) of the interphone
d. When testing the interphone audio circuits
control. The audio output signal of headset
of an interphone control, INPUT SEL switch S3
amplifier A2 is then applied through OUTPUT
is placed in t h e R (receive) position and
SEL switch S2 and through SIGNAL switch S6,
RECEIVER SEL switch S4 is placed in the
through contacts A2 and A3 of relay K1 to
INTER position. The audio signal developed
OUTPUT MTR jack J4, or contacts B2 and B3 of
across load resistor R3 is applied to the wiper
relay K1 to HDST MIC jack J7 for monitoring.
contact of RECEIVER SEL switch S4, through
f. When INPUT SEL switch S3 and OUTPUT
the INTER position to the interphone line
SEL switch S2 are placed to the I position, the
(terminal 8 of J1) and the private interphone line
audio output signal from the audio oscillator is
routed through OUTPUT SEL switch S2 to
(terminal 6 of J1) of the interphone control. The
SIGNAL switch S6 and to OUTPUT MTR jack
audio output signal of headset amplifier A2 is
J4 where voltage measurements of the audio
then applied through OUTPUT SEL switch S2
oscillator signal can be made.
and through SIGNAL switch S6, through con-
2-2
