GE LBI-31482, Maintenance Manual

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DESCRIPTION
The General Electric Beacon

Monitor Pager is a
highly reliable, extremely compact receiver for tone and
voice paging and channel monitor applications.
The Pager is equipped with a built-in speaker, earphone
jack and antenna, and is shipped with two nickel-cadmium
rechargeable batteries and an external earphone.
The receiver is housed in a ruggedly-constructed case,
with all operating controls conveniently mounted on the top
and side of the case. An accessory jack on the bottom of the
radio is provided for an external earphone.
Power for the Pager is normally supplied by two re-
chargeable nickel-cadmium batteries that fit in a separate
battery compartment in the bottom section of the case. The
batteries can be recharged either in or out of the receiver.
If desired, the Pager can also be operated by mercury,
zinc-carbon, or alkaline batteries. However, these batteries
are not rechargeable.
The spring clip on the Pager may be used to clip the ra-
dio to a pocket or belt.
OPERATION
Turn the receiver on by placing the Power/Volume
switch to Volume HI position (See Figure 1). Several short
bursts of tone should be heard. The receiver is now ready to
receive messages.
Before a message is received, a short, interrupted burst
of tone will be heard, followed by a voice message. As soon
as the message is completed, press the Reset/Monitor button
to reset the receiver.
The Pager operates in either the SELECTIVE or MONI-
TOR mode.
In the SELECTIVE mode, the Pager operates as a tone
and voice receiver, and allows only those calls that are tone
coded for the Pager to be heard. After the call has been re-
ceived, the Pager switches automatically to the MONITOR
mode. The Pager will remain in the MONITOR mode, re-
ceiving all calls on the channel until the RESET switch is
pressed.
Placing the mode switch in the MONITOR position al-
lows all calls on the channel to be heard whether they are
tone coded or not. The Pager will squelch when no calls are
being received.
An earphone is available for use in high-noise areas, or
for receiving messages in private. Plugging the earphone
into the earphone jack disables the Pager speaker so that
messages can only be heard through the earphone.
After receiving the first message, it may be desirable to
reduce the volume by placing the OFF-HI switch in the LO
position.
CHARGERS
A single-unit desk-top charger and a multi-unit charger
are available for recharging the nickel-cadmium batteries in
the radio as well as spare nickel-cadmium batteries.
Temperature characteristics of nickel cadmium batteries
prevent a full charge at temperature extremes. For maxi-
mum capacity, recharge the batteries at room temperatures
between 65° to 85° Fahrenheit.
To use the charger, connect the power cable to an appropri-
ate power source. Place the Pager into the charger. The red
light will turn on, indicating that the Pager is being charged. To
charge spare nickel-cadmium batteries, place them into the bat-
tery insert. A second red light will come on to indicate that the
batteries are being charged.
BATTERY INFORMATION
Two different types of batteries are normally used in the
Pager. The type and battery life for each battery is shown in the
following chart.
BATTERY
TYPE
PART
NUMBER
TYPICAL
BATTERY
LIFE
Nickel-Cadmium
(Rechargeable) 19A703502P1 25 Hours
Mercury (Not
Rechargeable) 19A701300P1
Mallory MP401,
Eveready EP401E 115 Hours
BATTERY REPLACEMENT
The Pager is shipped from the factory ready for immediate
operation upon installation of two fully charged batteries.
To install or replace the batteries:
1. Slide the Pager OFF-HI switch to the OFF position.
2. Press in the battery cover on the ridges at the top of
the cover and slide cover down as shown.
3. Replace batteries according to the (+) and (-) signs in
the battery compartment.
4. Slide battery cover back into place.
CIRCUIT ANALYSIS
RECEIVER
Paging receiver Types ER-145-A1, -B1, -C1 and -D1 are
double-conversion, superheterodyne receiver for tone and
voice paging in the 33-50 MHz range. One circuit board con-
Failure to press the Reset button after receiving a
message may shorten battery life. Do not press the
Reset button while receiving a message or an alert
tone. Doing so will prevent you from receiving the
message.
NOTE
Figure 1 - Operating Controls
Do not attempt to charge mercury, alkaline or zinc-
carbon batteries. To do so may cause the batteries to
explode.
WARNING
Nickel-cadmium batteries should be fully re-charged
before using.
NOTE
Do not dispose of either the rechargeable battery or the
Mercury battery by burning. To do so may cause a bat-
tery to explode.
WARNING
There is no way to dispose of mercury batteries with-
out possible polution except by returning them to the
manufacturer for recycling.
Mallory Battery Company will buy all used mercury
batteries at the current market price. Batteries are to be
shipped prepaid, enclosing a packing slip indicating
who is to receive payment for the batteries to:
Mallory Battery Company
Plant #2
Lexington, North Carolina 27292
NOTE
Figure 2 - Battery Replacement
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