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USER MANUAL - VMA1240 INSTALLATION MIXING AMPLIFIER
Front PCB
J300
- Mic Emergency.
This jumper decides whether
the internal mics remain active
when an emergency signal is
present at the emergency input.
Shown position = active (default)
Move jumper to de-activate
internal mics in emergency.
Low-Z or LINE (Transformer) output configuration
To convert the amplifier to high-voltage
line operation, the low impedance output
socket should be unplugged from CN5 on the
amplifier pcb (a short pair of heavy red and black
wires), and replaced by the spare plug connected to
the toroidal transformer nearer the rear of the unit
(same wire types). Note that the low-impedance output
will no longer be available once the transformer is plugged
in. The secondary (output side) of the transformer is perma-
nently wired to the line output connector (a 4-pin 5 mm-pitch
screw terminal type), thus the high-voltage output will be active once
the internal connector change has been made. In high-voltage line
operation, always use the safety cover fitted over the connector!
Amp PCB
CN5
CN9
CN7
