I disconnected the mains power for 60s before testing
Before re-connecting, disconnected the + power feed to the HA200 and the handsets
Tested:
Pair B7/8: 12.07v
Pair B9/11: 18v
Pair B 10/11: 0v
Pair C 1/5: 12v
Re-connected the + feeds and re-tested the PSU. Got the same values.
Forgot to...
Hi
I have a fairly old BPT system installed: H200 entry panel; E310 PSU; XP/3 handsets (3 of them).
It has worked pretty well for 10+ years, but following a fairly close lightning strike the H200 and one of the handsets have failed.
I was advised to change the H200 audio module (this fix worked...