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PAGE 6 of 29 SENTRY TECHNICAL MANUAL VER1.6

INTERCOM 3 PCB

NOTE

In the event of the speech needing to be adjusted to eliminate feedback or to increase the

speech volume to an acceptable level the following two options are available :-

Option 1. The speech can be adjusted at the door panel amplifier by adjusting the two

volume controls (One for transmitting to the apartment and one for receiving from the

apartment).

Option 2. There is also a volume POT [VR1] on the intercom 3 PCB. This will adjust both

directions of speech at the same time and is only intended for situations when the volume

cannot be adjusted sufficiently at the door panel. (Note: This will also adjust the call tone

volume both at the door and at the apartment station).

CN1 Connections in from Sentry PCB

CN2 Connections out to apartment station

Volume adjust

The intercom 3 apartment station

interface PCB is required whenever

the 500, 500M or 500ST apartment

station are used. This PCB converts

the duplex speech into simplex

speech and controls the switching of

the apartment station

CON Terminal Function

CN1

+12V +12Vdc In

Gnd Ground

3 Switched 12Vdc

4 Calltone

2 Receive Speech

1 Transmit Speech

5 Lock Trigger

CN2

1 Lock button

6 Talk button

2 Switched 12Vdc

3 Speaker

5 Ground

+12V +12Vdc Out

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 31 32

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