Thanks to everyone so far for their thoughts
The 87A was completely "OFF" - not in standby. I understand that there is still
some power running some some of the circuits as the meters indicate exciter
power levels even when powered down.
Upon power up the amp goes into it's warm-up mode - the Wait LED lights; no
Hard Fault Codes are indicated; after warm-up mode - upon pressing a Band
segment button on the Amplifier there is motor movement in the amp as it does
it's "thing". However the amplifier does not sense the RF from the exciter to
change bands automatically. Also no "amplification" is indicated. Th amp does
not shut down by itself and powers down without issue when turning it off.
We removed the top cover looking for a component, (based on the "bang and
flash" described by my father I expected to see something blown (capacitor?).
Nothing was immediately evident however.
I tried to talk to the amplifier using a comm program as described in the
manual - I was unsuccessful in this however. I guess my Father will call Alpha
power Monday and ultimately probably box it up and ship it back for diagnoses
and repair.
Previously to this problem the amp has performed without issue for 4 1/2 years
- my Father just chases DX - I occasionally go to his station and operate
contests with it.
(My apologies for the non-technical nature of my descriptions)
73
Jon
K9JS
On a non related amp note - I am off to PJ2 for a week of R&R and a Multi entry
in the CQWW RTTY contest next weekend, PJ2/K9JS during the week and PJ2B during
the contest. I'll only be able to access email Monday for a while before
leaving so any questions posed to me will not be able to be read and answered
until my return 27 September.
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