User manual

User Manual PS 680 / Issue 1 © 1999 ASL Intercom, Utrecht, Holland.
3
5.0 FRONT PANEL CONTROLS
1 POWER ON/OFF switch
Mains power push button for switching ON and OFF
the internal power supply.
2 OVERLOAD LEDS
These LED’s illuminate if the internal power supply
has shut off line power due to overload.
If the internal power supply is overloaded (too many
user stations are connected or short-circuit in the
interconnecting cables or thermal overload), it
activates a circuit-breaker which immediately shuts off
line power. This circuit breaker resets automatically 3
seconds after the overload situation is terminated,
restoring line power automatically.
During short-circuit, the overload LED extinguishes
very shortly every 3 seconds. During thermal overload
the LED burns continuously.
This overload LED also comes on every time you
switch on the main power.
3 POWER LED
This LED illuminates if line power is supplied by the
internal power supply.
4 ALL MIC'S ON/OFF button
With this pushbutton all microphones of the connected
stations can be muted.
5 ALL BUZZERS ON/OFF button
With this button all buzzers of the connected stations
can be muted.
6 AUX VOLUME control knobs
These knobs adjusts the master level of the aux (I & II)
input signals before these are routed to the matrix.
7 AUX MATRIX trimmers
These trimmers control the volume of each AUX input
as send to that specific channel.
6.0 REAR PANEL CONTROLS & CONNECTORS
8 A & B LINE connectors
These XLR-3 type connectors are for connecting user
stations, via standard microphone cable.
There are two connectors for channel A and two
connectors for channel B.
Pin assignments :
1. 0 V / ground shield
2. +30 V power wire
3. audio wire
9 AUX INPUT connectors
This XLR-3 type aux input is electronically balanced
and accepts audio levels between -18dBu to +22dBu
on line level, and -38dBu to +2dBu on mic level.
Pin assignments :
1. 0V / ground
2. Signal +
3. Signal -
When mic level is selected, a +30V DC phantom
power is supplied to pins 2 and 3.
10 MIC /
LINE
SWITCHES
With these switches the sensitivity of each AUX input
can be chosen, Mic level or Line level.
When mic level is selected, a +30V DC phantom
power is supplied to pins 2 and 3.
11 MIC GAIN
When Mic level is selected this trimmer adjusts the
sensitivity of the AUX input.
10 FUSE
This fuse protects the PS 680 against severe internal
damage, in case of malfunction in the power section.
To remove the fuse the mains cord must be removed.
It is most important to place the correct fuse in the
holder :
mains voltage
fuse
90 - 240 VAC T 1250 mA
Spare fuses will be found in the small packet supplied
with the unit.