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TM 11-5820-890-20-2
1-28
1.10.
DC POWER INPUT AND DISTRIBUTION. Continued
g.
Remote Control.
An LS 671 or AM 1780 can remotely power up the vehicular amplifier adapter (VAA) or power supply
adapter (PSA) if they are set to the remote mode.
Primary power enters the MB at connector J1, pin B. From here it is distributed to MB J3 and J4. Cables
carry the dc on pin B to an LS 671 or AM 1780. If the LS 671 ON/OFF switch is set to ON or the AM 1780
MAIN PWR switch is set to NORM, the dc on pin B is returned on pin D and sent back through the
cables to MB J3 or J4. MB J3 or J4 connect pin D to the system connector J5, pin E. This is a direct
connection to the VAA or PSA system connector P1, pin E.
DC power on P1, pin E of the VAA or PSA energizes relay K1 allowing power to exit on pin C. Pin C of
the MB distributes the dc power to connectors J3 and J4. The cables then send the power on pin C to
the LS 671 or AM 1780 in order to power their audio amplifiers.
DS1 will light at the LS 671 indicating complete power. DS501 will light at the AM 1780 if CB501 is set to
ON.
The cables and interconnects that provide for remote power are as follows:
MB
J3*
CX 13313
CX 13300
P1
P2
P1
AM 1780
J501
* This is the typical connection. Some instances connect to MB J4.
MB
J3
CX 13417
CX 13300
P2
P1
AM 1780
J501
J1
J2
*
LS 671
J1
P2
P1
CX 13292
P1
P2
* CX 13292 and CX 13300 may be connected to J1 or J2 of CX 13417.
*
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