Good Evening,
I recently purchased an Alpha 87A, and the original purchaser provided me with
the Alphamax upgrade kit, which Alpha sent him, but he never installed. It
consists of a PAL (U8) and an eprom (U7) which are to be changed out. I
replaced the PAL and eprom, and installed the berg jumper, as per the included
instructions. However, when completed, the amplifier hard faults off within 10
seconds of power up.
I immediately pulled the new eprom, and reinstalled the original eprom, then
removed the new berg jumper, and re-assembled the amp. It works perfectly with
the old eprom once again. As per the instructions, the new PAL can remain in
place if/when reverting to the older software eprom.
Just to be sure, I tried the procedure again, with the same results. The worst
part is the eprom's location, so it requires pulling the front panel each time!
The only thing I can guess is that the eprom lost some "bits" from sitting in a
box the past 9 years or so. Or, the eprom was programmed improperly from the
get-go.
I have eprom burning equipment here in my shop, so burning another eprom (or
erasing/re-burning this one) would not be an issue, but the bin image file is
not available online anywhere as far as I can tell. Therefore, even if I
read the current eprom I have in my hands, I can't verify it's contents.
Of course, this had to happen on a weekend, so I can't even call Alpha
(now RFC) until Monday.
Would anyone happen to have an image of the 87A's Alphamax-capable eprom
contents, or at least know the CRC checksum?
Anyone else experience a similar situation?
Thanks,
Eric
K2WD
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