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Joined: May 2007
Posts: 5,058 Likes: 5
Moderator-1A2, Cabling
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Moderator-1A2, Cabling
Joined: May 2007
Posts: 5,058 Likes: 5 |
Sounds like an open A lead.
As Arthur suggested, open the KSU and short the Black/Brown pair - the light should come on. If it doesn't, remove the station wiring and try again. If it still doesn't, then the internal KSU cabling is open or has been removed.
Very often line 5 was used for an Intercom. 401 B Intercom and Dial Intercoms did not need an A lead. Perhaps it was "stolen" for some other use.
If the lamp does light, then try shorting the line from inside the set.
As far as hearing ringing signal, but not dial tone, you might be "off half a pair on the cut down". Double check your wiring.
Sam
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