CENT.MBECK%MIT-OZ@MIT-MC.ARPA (04/28/84)
From: Mark Becker <CENT.MBECK%MIT-OZ@MIT-MC.ARPA>
<Why doesn't someone fix this bug?>
This is for owners of U.S. Micro's or Delta Products 64k dynamic
RAM cards - You might want to check the installation of C6, a 10-to-47
uF capacitor located just to the left of where U2 and U4 butt together.
On some boards, the silk-screening is backwards! And the capacitor
may be installed backwards as well.
Typically this capacitor, after a period of time, will turn into
a resistor and load down the -5V going to the memory chips. The voltage
on the card I have reached -4V, at which point programs started crashing.
I replaced it - local Radio Shack had it on the shelf. Went and
checked three Delta boards and found they had the same problem.
Other than that, I've found the hardware to be pretty solid - no
other problems in two plus years of operation.
Mark Becker
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