[time-nuts] HP 3458A ISOLATOR DTACK err @ pwr up

Greg Burnett gbusg at comcast.net
Tue Jul 28 03:44:49 UTC 2009


Brooke wrote:

At power up the HP 3458A briefly says TESTING RAM and all the panel pixels 
are
on then displays ISOLAOR DTACK.  The repair manual says:
201 Outguard Controller A5.
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Hi Brooke,

The component-level packet is Agilent p/n 03458-90033.
https://onlinestore.tm.agilent.com/Agilent/en/US/partnerMkt/onlinestore?cmd=eFAPCatProductDetail

What's the p/n and Rev of the A5 outguard controller board in your 
particular box, and, if it has DS1220Y & DS1235Y Dallas Semiconductor 
Nonvolatile Rams, what are the date codes on those I.C.s?

After the ISOLATOR DTACK error, did you hit "key shift blue" + "Error" keys 
to see if there are additional errors hidden behind the first? You have to 
keep hitting that key sequence until you've read all errors (if there are 
more than one). After you've read the last error, can you hit "key shift 
blue" + "Clear" to get the DMM to actually function? Or is it locked-up at 
that point?

73,
Greg 




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