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 answerRibbon cable disconnected

500 Series Ringing All phones Not ringing Ribbon cable disconnected

Recommended guidance500 Series

What to check

The ribbon cable must be plugged onto the column of pins correctly.

Early types had 3 empty pins on empty sockets at the top end and newer types do not.

So if replacing the 500-LS pcb with a newer type, plug in with the top wire on the top pin.

Plug on correctly.

See page 13 of the installers notes booklet..

ID13533