Okay, are you sure the internal switching contacts are working as
intended?
It's been a few years since I was inside one but my memory is that
there are two per solenoid?
Effectively a N/C one when the solenoid is in the 'de-selected'
state and a N/O one that closes when it is selected.
They function in a break before make way where the power to the
'select' coil is routed through N/C contact and the power to the
de-select coil through the N/O contact.
So, if the actuator rod is gunked up with gooey o-ring and not?
moving freely over it's full travel I guess that might explain what
you are seeing - which coil is remaining energised?
On 15/09/2024 12:20, Jinxie via
groups.io wrote:
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Okay. Well I have an 'intermediate update.' Cycling through 0
to 70dB I can see all solenoids switching seemingly normally -
apart from the second from left in the photo. Commencing with
all attenuators in the 'up'/off position, It flicks 'on' okay
but then remains stuck there and won't release again. And
clearly its coil is remaining energized as it can't be manually
flicked off, either. Not sure if this could account for the
problem I've had or whether there are other things amiss (such
as the perished o-ring) also.
So, anyway, once that first 20dB attenuator is switched in,
it cannot be switched out again and there's a minimum of 20dB
attenuation permanently in-circuit. Could there be an issue with
the control logic?
