DoorKing 1812 Owner's Manual download pdf (Page 44)

5.2 Phone Line Polarity

C.O. (Phone Company)

Phone In

Phone Out

Home

Bypass

Switch

DC Positive

DC Negative

1812

Terminal

Phone In

Phone Out

Ground

DC Positive

DC Negative

Check polarity on terminals.

Example: set a VOM meter to measure DC volts.

Place the positive lead on 1812 terminal 2 and the

negative lead on 1812 terminal 1. If the meter shows

a positive voltage - OK. If the meter shows a negative

voltage (needle moves off scale to the left), reverse

the wires. Repeat this process to check other wire

pairs on bypass switch and 1812 terminal strip.

Dashed lines are existing circuit board

connections and are shown for clarification purposes

only. DO NOT add any additional jumpers to wiring

or terminals.

When connecting multiple 1812 systems, maintain

common polarity on all connections.

When troubleshooting 1812 operational problems,

check phone line polarity. Crossed polarities can

affect system operation.

Ring

Tip

Ring

Tip

Gnd

Surge

Suppresser

White/Blue

Blue/White

Central Office (C.O.)

Demarcation Device

Green

Red

Wiring if surge

suppresser is

not used.

Earth

Ground

White/Blue

Blue/White

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DoorKing 1812 Owner's Manual Page 44

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