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4. Set switch S2 for proper supervision of the
ASC-2.
CAUTION: Incorrect settings can cause
failure of the backup amplifier to transfer.
SETTING SWITCH S2
Riser 1
SW1
O
SW2
O
SW3
SW4
SW5
X = Enable backup amplifier supervision
O = Disable backup amplifier supervision
X = Closed or ON,
a. Check the system wiring plan to be certain
of amplifier and riser assignments; then
set switch S2, dipswitches SW1 and SW2
by following the table above. Refer to
Figure 2 for the location of switch S2.
b. Close SW5 on switch S2 if this ASC-2 card
supervises the backup amplifier. If one
backup amplifier is shared by more than
one ASC-2 card, open SW5 of S2 on all
ASC-2 cards except the one that
supervises the backup amplifier.
5. Refer to Figure 2 again; note the position of
J1 and J2.
a. To set the ASC-2 for 25.2V RMS:
• Refer to No. 10 below.
• Place J1 jumper in the left-hand position
with the gold-plated edge facing up.
• Check that fuse F1 is 6A.
Figure 3
Placing the User Key in the OMM-1
Amplifier input
Riser 2
Riser 3
ILLEGAL
X
O
X
O
X
X
NOT USED
NOT USED
O = Open or OFF
b. To set the ASC-2 for 70.7V RMS:
• Refer to No. 10 below.
• Place the J1 jumper in the right-hand po-
sition with the gold-plated edge facing up.
• Check that fuse F1 is 2A.
c. If the backup amplifier is an EL-410C/D,
place the jumper J2 in the upper position
with the gold-plated edge facing up. This
connects the backup amplifier input
negative side to the MXLV power supply.
Otherwise, place J2 in the lower position.
Check the data sheet of your amplifier for
more information.
6. Do NOT install the card in its edge connector
until ALL OMM-1 field wiring is completed
and checked for shorts, opens, and other
faults. Refer to the Wiring Checkout Chart.
Replace the card in its protective bag if the
wiring is not complete.
7. Place the user key from the installation kit in
the OMM-1 card edge connector for the
ASC-2. This prevents the installation of any
other card type in the ASC-2 slot. Two keys
to prevent reverse installation of the card are
already factory installed in the OMM-1 edge
connectors. See Figures 3 and 4.
Figure 4
Location of the
User Key for the
ASC-2
3
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