Battery Fuse
Directly above the Standby Battery Connector is the unit's
Battery Fuse, which protects both the CP-220A and the
battery against the high currents that would occur if the
battery were connected with its polarity reversed. The
battery fuse is an AGC-Type or GLH-Type 8-ampere
fast-blow fuse, and like the AC Fuse, its approximate
dimensions are 1¼" long x ¼" diameter. As before, remove
such a fuse by pressing down on the cap and turning it a
quarter turn to the left. Replacement is done in the opposite
manner.
NOTE: The CP-220A will operate from a suitable Standby
Battery if the receiver is either deprived of AC
power or its AC Fuse is blown.
Listen-In Audio Connector
At the upper left of the rear panel, a set of two terminals is
provided (marked by two asterisks) for the connection of an
external device (e.g., a loudspeaker or a tape recorder) that
can be used to monitor or record the audible activities that
take place at the premises while a
Listen-In
account is
reporting.
Any device connected in this manner must present an
impedance to the CP-220A of no less than 8 ohms, and will
receive the same output provided to the front panel's
loudspeaker and headphone jack. The output at these
terminals is affected by the volume control on the front
panel but is not influenced by the connection of
headphones.
More information about
Listen-In
Accounts can be found in
Section 2
.
NOTE: Connection of a tape recorder to the Listen-In Audio
Connector may require a special cable or the
modification of the cable supplied with the recorder.
Sounder
The two corresponding terminals (marked by two asterisks)
represent a set of normally-open dry contacts that close
whenever the receiver's internal sounder is activated. They
allow for the connection of a remote annunciating device,
either audible or visual, which can be used to alert
personnel in another area of the Central Station that the
receiver may require attention or operator intervention.
CP-220A Central Station Receiver
Section 1: Getting Acquainted Page 1-13
Hook-Up and Installation Manual