Cloud Electronics PM16 - Manual (Page 20)

PM4/8/12/16 & PM4/8-SA Installation and User Guide v1.0 20
Installation
Accessing the internal PCB
With most installations, it will be necessary at some point to access the PM’s internal
PCB. Access is required to make connections to the analogue interface (possibly including
DC power connections) and to connect the associated audio output, to move the
various configuration jumpers, to adjust the mic or chime levels and, on the SA models, to
connect to the external message trigger inputs, if used.
The standard (non-SA) and SA models of the PM are fitted with different PCBs, but the
housing and method of access are the same. Refer to “PCB layout diagrams” on page 49
for PCB layout diagrams showing locations of jumpers, pre-set controls, connectors and
other primary PCB items.
To gain access to the PCB, first disconnect any source of external power (e.g., a local
external PSU or the Digital Paging Interface). Then remove the five pozidrive screws
securing the bottom cover plate onto the moulded housing. Gently lift the housing free,
noting that the PCB to which the top panel components are mounted is connected to
the lower PCB by a ribbon cable. Take care not to stretch or snag either this or the cable
from the gooseneck mic. The ribbon cable may be unplugged from the PCB to give easier
access to the board, if wished.
Re-assembly is the reverse procedure; always use the same screws.
Mounting Options
In most cases, the PM will be used as a desk-top, free-standing unit. In situations
where desk space is at a premium, or where access to the microphone needs to be
restricted, an alternative mounting method is to fix it on a vertical surface such as a
wall. In this case, it may be appropriate to fit a shorter gooseneck mic, as the standard
one (300 mm) may prove awkward in use and possibly constitute a hazard.
Free-standing
No special provisions are needed to use the PM in a free-standing mode. Cable access
is via the rear glands and the unit is provided with four rubber feet to prevent slipping
on a polished surface. The standard 300 mm gooseneck microphone will be suitable
for all normal desk or counter locations.
Wall Mounting
NOTE: if the standard gooseneck mic is to be replaced with the shorter alternative
(see “Fitting the MI100166 gooseneck microphone” on page 21), perform the