Fault 99 is the fault that happens when you keep trying to do the same
dumb thing six times in a row without solving the real problem. It is
designed to protect the amp from serious abuse and to save a couple of
expensive tubes.
With a Fault 99 there is some underlying problem that needs to be
resolved. I doubt it is in the microprocessor since it seems to be
doing its job. So it could be an operational issue or a real problem
in the electronics.
When any fault happens, the LEDS flash a code on the front panel to
help in diagnosing the problem. Yes -- it is in the manual. But once
you hit six identical faults without a successful operation then it will
no longer operate. This is designed to help the customer's wallet as
well as helping Alpha provide the best warranty in the business, a full
4-year warranty. The amp is smart enough to protect itself when being
abused -- or at least not having the problem solved after six unsuccessful
attempts to operate.
If you DO have an Alpha 87A and it faults, when you turn it back on
look at the pattern of flashing LEDs and go to the manual and look
up what that code means. That will give you a big head start in
solving the problem before the dreaded Fault 99 occurs. Repeated
operation without solving the real problem will just make the computer
mad, and it is a union computer so you only have six times before
it files a Fault 99 grievance! ;-)
--John W0UN
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