<x-flowed>I've usually found that the buffer ICs have issues when you get a bad
beep. So I'd change the 74LS245/373's on the RAM/ROM address or Data
buffers - starting with the data buffers.
Or grab a Fluke 9010A and the correct pod and troubleshoot professionally...
John :-#)#
At 7:14 PM -0500 6/9/05, Bill Karkula wrote:
>I worked on four Missle commands for the first time and got three of them
>working (what a design - not designed for easy hardware debugging). The
>fourth board has me stymied. It comes up with one high beep for one of the
>4116s being bad which I have replaced twice but the error still comes up.
>If I intentionally remove any other drams the correct beep error is caught.
>I've checked continuity to the suspect Dram but all is fine. I've gone over
>all of the sections of the board and they all seem to be working but the
>board as a system won't come up. It just keeps looping the dram beeping
>test. Any suggestions based upon your collective experience would be
>welcome.
>
>Thank You and Best Regards,
>
>Bill
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Received on Thu Jun 09 22:12:58 2005
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