The cpu card in my 5371A seems to have died. It's asserting reset constantly, with lights 1 and 6 on. Unfortunately, my service manual doesn't include any schematics for that card. Does anyone have any suggestions? (other than doing a lot of tedious tracing) -- Bill Ezell ---------- They said 'Windows or better' so I used Linux.

wje wrote: > The cpu card in my 5371A seems to have died. It's asserting reset > constantly, with lights 1 and 6 on. > > Unfortunately, my service manual doesn't include any schematics for that > card. Does anyone have any suggestions? (other than doing a lot of > tedious tracing) > > Try fig 7G8 in part 2 of the 5371A manual available on the Agilent website. Bruce

wje wrote: > The cpu card in my 5371A seems to have died. It's asserting reset > constantly, with lights 1 and 6 on. > > Unfortunately, my service manual doesn't include any schematics for that > card. Does anyone have any suggestions? (other than doing a lot of > tedious tracing) > > Correction: Figure 7G8 on page 7G17 for the processor board schematic. Bruce

My 5372A had the same problems. Error: Contact problems in IC sockets and jumpers Remove IC and jumpers and put those back. This solved my problems Juerg

Thanks. I don't know how I missed those manuals on the Agilent site; I had looked there a while ago. Bill Ezell ---------- They said 'Windows or better' so I used Linux. Bruce Griffiths wrote: wje wrote: The cpu card in my 5371A seems to have died. It's asserting reset constantly, with lights 1 and 6 on. Unfortunately, my service manual doesn't include any schematics for that card. Does anyone have any suggestions? (other than doing a lot of tedious tracing) Correction: Figure 7G8 on page 7G17 for the processor board schematic. Bruce _______________________________________________ time-nuts mailing list -- [1]time-nuts@febo.com To unsubscribe, go to [2]https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. References 1. mailto:time-nuts@febo.com 2. https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

On both of my 5370As, the only way to permanently fix socket problems of that type was to replace all the sockets with gold plated, machined pin sockets. On the 5370, that was easy because the boards have relatively large holes compared to the socket pins, and there is no ground plane, so it was easy to unsolder the pins with the good desoldering tool I have access to at work. Prior to that, I had removed all chips and sprayed the sockets with DeOxIt Gold several times, but the problem always came back pretty quickly. I think it was tin wiskers. Didier > -----Original Message----- > From: time-nuts-bounces@febo.com > [mailto:time-nuts-bounces@febo.com] On Behalf Of Jürg Kögel > Sent: Friday, August 08, 2008 4:07 AM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] HP 5371A problem > > My 5372A had the same problems. > Error: Contact problems in IC sockets and jumpers Remove IC > and jumpers and put those back. > This solved my problems > > Juerg > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com To unsubscribe, > go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there.

Thanks, all. In this case, it was a 74ALS1035 OC hex buffer that gave up the ghost. I've temporarily replaced it with 6 diodes, which works like a charm. After all, what's an OC buffer but a diode plus a little 1x gain? Bill Ezell ---------- They said 'Windows or better' so I used Linux. Jürg Kögel wrote: > My 5372A had the same problems. > Error: Contact problems in IC sockets and jumpers > Remove IC and jumpers and put those back. > This solved my problems > > Juerg > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > >