Re: Stuck channels on a 16550A


Harout S. Hedeshian wrote:
I have a 16550A with several stuck channels. One of them is always
stuck hi and two other stuck low. I checks the cables on another card
and they work fine. When I boot the 16500B into diagnostic mode, the
card passes all self diagnostics and it shows that all channels are
changing, but when rebooted in to normal mode, the hi channel always
shows hi even if I short it to ground. This leads me to believe that
the problem is somewhere before the sampling ICs. How likely is it that
one of the 1DX5-001 has gone bad? Does the self-diag test these? Is
there any part you would suggest I troubleshoot first? Does anyone else
have a 16550A with stuck channels that they are willing to sell for
parts? Or any known good 1DX5-001 [P]LCC parts?

UPDATE: I jumped the bad channel (always showing hi) to the input
channel on another pod that one showed hi as well. If I check the
voltage on a normal channel with my voltmeter, I get 0 volts. But the
stuck channel shows 1.4 volts all the time. Jumpering that channel to
ground accomplishes nothing. It is bit #3 on pod 1, does anyone know
which chip to check?

.

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