VCA Control
An external pot (500K) can be connected to the AMIS60/120 for remote control of the master level. The
external pot is governed by the master level of the amplifier allowing the installer to set the volume, then
lock the amplifier in a rack, leaving the user with just a master volume control that cannot go beyond the
level set on the master (front panel) control. Connection is via a 2 wire terminal strip on the rear panel of
the amplifier.
Other Features
Tone Generators
Four separate tones are available from the in-built tone generator board. All four tones can be activated
individually via a contact closure connected to the screw terminals on the rear of the amplifier. To activate
the bell chime for example, just run a pair of wires from the Tone generator common and the Bell terminal
to an external switch. Activating the switch, or closing the pair of wires, will activate the bell. When any
tone is activated, all inputs (except for inputs 1 and 2) will automatically mute. To adjust the level of the
tone generator, disconnect the power lead, remove the amplifier lid and locate the pot labeled R6. (located
behind the Bass adjustment pot). This pot adjusts the level for all 4 tones.
Tones available on the AMIS60 and AMIS120 include:
- Evacuation Tone
- Alert Tone
- Bell Tone
- Pre-Announce Chime
Muting
A VOX muting card is installed in the AMIS60 and AMIS120. This feature provides automatic muting of
some channels when others are active. It is normally used so that a paging microphone can have priority
(by muting) over background music. VOX muting is available from channels 1 and 2, meaning that any
signal on channels 1 and 2 (mic or line) will mute channels 3 & 4. The muted channels will automatically
ramp back up to normal volume when the signal on channels 1 and/or 2 is no longer active. The amplifier
ships with the VOX muting function enabled. To disable the VOX muting, disconnect the mains power
lead and remove the lid of the amplifier. Looking down from the front of the amplifier, a three position
jumper (labeled JP2) is located just to the left and behind the level pot for channel 1. To disable VOX
muting, move the jumper to the middle and left pins. (Factory setting is with VOX enabled with the jumper
on the middle and right pins).
Fuse Sizes
Mains AMIS60, 230 VAC: 2 Amperes Slow Blow
Mains AMIS120, 230 VAC: 4 Amperes Slow Blow
Notes
The DC fuse is located on the circuit board. This is a feature of the AMIS series amplifiers,
which are equipped with a current limiting circuit preventing excessive DC currents, thus
eliminating the risk of blowing high tension fuses. In the unlikely event
that the DC fuse
actuates, the output transistors should be checked, as it is probable that the amplifier has been subjected to
very extreme conditions.
(2 pages)
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