PAGE 5
User Manual PCA 120 USB
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Mains Connection (33)
The supply transformer has been designed for use on either 115V AC or 230 V AC, selected by slide
switch on the rear panel
(32)
. The amplifier is factory set at 230 V AC mains voltage.
Battery Connection (24V DC) (15)
When using externaI batteries, the amplifier must be earthed via the screw terminal due to the high
voltages present. This is necessary to ensure the case is earthed and ensure electrical stability.
Input Connections
Mics 1~2 incorporates balanced standard XLR 3P and DIN 5P sockets on the rear panel.
Inputs 3~4 incorporate balanced standard COMBI socket (1/4” stereo jack, and XLR 3P) and DIN 5P on the
rear panel. With the input selector
(35 & 37)
, it is possible to choose the input device (MIC or LINE level ans to
feed a condenser microphone with 24 V phantom power).
Wiring is as follows
:
XLR 3P
Pin1 : Screen
Pin2 : Signal (live)
Pin3 : Signal (return)
DIN 5P
Pin1 : Signal (live)
Pln2 : GND
Pin3 : Signal (Return)
Pin4 : Priority Control
Pin5 : GND
1/4” STEREO JACK
Tip : Signal (live)
Ring : Signal (Return)
Sleeve : Screen
SLEEVE RING TIP
CONNECTIONS
Base sockets
(Front view)
NOTE
: Mic 1 & 2 incorporate phantom power
.
look for the
S 401 and S402
jumpers on the main PCB. The default position is ON, therefore, change the
jumper to the OFF position.
NOTE
: Mic 3 & 4 phantom power can be turned on/off using the rear panel switch
(35)
,
(37)
.
which is ON by default If you need to disable the phantom power,
Priority Microphones
PCA 120 USB
has a cascade priority system, i.e., Mic 1 has the highest priority (apart from TEL/EMER), Mic 2
has priority over the rest of inputs except Mic 1, Mic 3 has priority over the rest of inputs except Mic 1 & Mic 2,
and, finally, Mic 4 has priority only over AUX and USB/SD player/recorder.
To enable priority short pins 2 & 4 on the DIN 5P connector of the chosen input.
- Priority terminals
(40)
have the same purpose
BUT ONLY
APPLIED TO MIC 1.
Chime On/Off
Switching on the manual chime on/off
(36)
switch on the rear panel and on priority conditions of any Mic
input, it will activate the chime function ( ‘Ding Dong’ ) pre-annoucement chime).
The default volume of the chime is pre-set at the factory and should be suitable most applications.
Turn the front panel potentiometers clockwise to increase the volume or anticlockwise to reduce the volume.
NOTE
: Mic 1 & Mic 2 are provided with a “Sens VR”
(26)
&
(29)
sensitivity potentiometer for gain adjustment.
- The priority state only remains active whilst the switch is closed.
- If the Chime switch
(36)
is set to on, a ‘Ding Dong’ pre-annoucement chime
will be played; after which an annoncement can be made.
EN
