Lexicon PCM 42 - SECTION THREE INSTALLATION; 3.1 Power Requirements; 3.2 Audio Signal Connections

ADEQU
TOM AND , whether or not it 's
k-mounted, This is of particular importance if the
s mounted above power ampli er heat
gener: 2Ng gear.
Since the PCM 42 processes low-level audio signals,
if iS advisable to locate it away from strong elec-
tromagnetic fields, such as those generated by power
transformers, motors, fluorescent ballasts, etc.
3.1 POWER REQUIREMENTS
The PCM 42 is set at the factory to operate at either
100, 115, or 230 volts (50 - 60 Hz). The factory-set
voltage is indicated on the rear panel next to the power
receptacle. The maximum power required is 20 watts.
Units set for 100 or 115 volts are fused at 1/4 ampere,
230-volt units at 1/8 ampere.
THE OPERATING VOLTAGE SHOULD NOT BE
CHANGED EXCEPT BY A QUALIFIED SERVICE
TECHNICIAN.
The PCM 42's power cord has a standard three-pin
IEC connector to simplify adaptation to power sources
in various countries, and to provide chassis-to-mains
grounding according to accepted safety standards.
SECTION THREE
INSTALLATION
3.2 AUDIO SIGNAL CONNECTIONS
r stereo (or
>} Plugs for Input
ad this Ssupsection fo
or foot pedal cor é
e proper cable for each
ensure that YOU are
function.
IGE UTD ruSsed WA
g (Tip = signal high, | Ring = signal iow,
Sleeve = shield ground).
it can aiso be used with unbalanced input sources
when fed by a T/S phone plug (Tip. = signal high,
Sleeve = sana ow! shi ield). This creates a traditional
single-ended inpu
NOTE: if a T/R/S plug is used with a
source, be sure to short the ring and sl
together.
single-ended
eeve terminals
OUTPUTS
The MAIN, DIRECT and DELAY audio outputs (Fig.
2.2, L, G and F) are unbalanced (single-ended), and are
intended for use with a T/S phone plug. Load im-
pedances of 5 kilohms or higher can be driven to full
levels; loads as low as 600 ohms may be driven without
loss of signal quality, although the output level will be
reduced slightly. lf the PCM 42 is used to drive
microphone level inputs from the DIRECT or DELAY
outputs, it will be necessary to insert a 20- or 30-dB pad
at the input to the driven device. The MAIN OUTPUT
has its own level control.