Technical support

Fault Finding Guide

Work through a few focused questions to identify the likely cause and find the relevant technical guidance.

Choose the closest answerD3 wire disconnected

500 Series Audio All phones No speech at all D3 wire disconnected

Recommended guidance500 Series

What to check

The D3 wire at the door panel is the source of the voltage for all speech and DTMF commands.

The D3 terminal should have 10v DC everywhere which drops to about 7v DC when a conversation is in progress.

Reconnect the D3 wire.

ID13533