Help on Tek 2710 requested

[baun-godby]

I have a 2710 Spectrum Analyzer that suddenly wil not complete bootup.

Error messages:

Cannot clear I/O Subsystem
FF Loopback Exp 55 Act FF
FF Loopback Exp AA Act FF
CFC Loopback Exp 55 Act FF
CFC Loopback Exp AA Act FF
CFC Loopback Exp 55 Act FF
CFC Koopback Exp AA Act FF

Unit then locks up.

Any hints on where to begin would be appreciated. Power supplies measure
within normal, I have reseated all cards, etc.

Thanks!

Terry Baun

 

[Don Taylor]

"baun-godby" <baun-godby@insightbb.com> writes:

I have a 2710 Spectrum Analyzer that suddenly wil not complete bootup.

Error messages:
Cannot clear I/O Subsystem
FF Loopback Exp 55 Act FF
FF Loopback Exp AA Act FF
CFC Loopback Exp 55 Act FF
CFC Loopback Exp AA Act FF
CFC Loopback Exp 55 Act FF
CFC Koopback Exp AA Act FF

This may be obvious, perhaps even true, and yet completely useless.

It looks like they were sending out an alternating bit stream and
expecting that to loop around and back to the input. But it looks
like the line is stuck high.

Since it says it can't initialize the I/O, I'd wonder whether this
might be somewhere in one of the various serial or parallel links.

 

[baun-godby]

Thanks very much for sharing your thoughts. The idea that the data line(s)
may be locked high did not occur to me and I'll have a closer look. I think
it has to be something rather simple....

--Terry Baun