Lots of background hiss with Merlin 410

[Steven Stone]

I have an old Merlin 410 PBX in my house, acquired dumpster diving when
a local volunteer Fire Department upgraded their PBX.
It is on a UPS, has the music on hold feature, with 3 incoming lines
from my telco. Since summer, after some thunderstorms, I've noticed
significant white noise in the background on all extensions. No noise
if I use the same outside lines without the PBX.
Is there a specific area / module of this PBX that is known to fry
during thunder storms ?

Thanks
Steve
N2UBP

[T]

Post by Steven Stone
I have an old Merlin 410 PBX in my house, acquired dumpster diving when
a local volunteer Fire Department upgraded their PBX.
It is on a UPS, has the music on hold feature, with 3 incoming lines
from my telco. Since summer, after some thunderstorms, I've noticed
significant white noise in the background on all extensions. No noise
if I use the same outside lines without the PBX.
Is there a specific area / module of this PBX that is known to fry
during thunder storms ?
Thanks
Steve
N2UBP

How about intercom calls?

Check the lightning protectors on your incoming lines. Sounds like one
of them did its job.

[Etop Udoh]

Post by Steven Stone
I have an old Merlin 410 PBX in my house, acquired dumpster diving when
a local volunteer Fire Department upgraded their PBX.
It is on a UPS, has the music on hold feature, with 3 incoming lines
from my telco. Since summer, after some thunderstorms, I've noticed
significant white noise in the background on all extensions. No noise
if I use the same outside lines without the PBX.
Is there a specific area / module of this PBX that is known to fry
during thunder storms ?
Thanks
Steve
N2UBP

I used to service those units (as best as I could) and it would be
cheaper to dump it. You could try replacing the small line
transformers on the front board and if that doesn't do it then the
problem is in the middle component board -> and all is lost then....
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