> For a cheap (slightly)longer term fix, wipe the IC pins > with a swab moistened with WD40!
BALLISTOL is also recommended for that job. Best regards Ulrich Bangert > -----Ursprüngliche Nachricht----- > Von: time-nuts-boun...@febo.com > [mailto:time-nuts-boun...@febo.com] Im Auftrag von Robert Atkinson > Gesendet: Mittwoch, 20. Mai 2009 08:58 > An: Discussion of precise time and frequency measurement > Betreff: Re: [time-nuts] HP 5370A socket problem > > > > Hi, > I've not seen socket problems on my 5370B, but have with > other equipment. The TI leaf contact sockets seem to be the > worst. I've often wondered if it's a plating compatability > issue. Small differences in plating composition might be > causing problems. Retention force is not an issue as noted, > but high retention could be caused by corrosion. Often just > shifting the IC's in their sockets will effect a short term > cure. For a cheap (slightly)longer term fix, wipe the IC pins > with a swab moistened with WD40! > > Robert G8RPI. > > --- On Wed, 20/5/09, Chuck Harris <cfhar...@erols.com> wrote: > > > From: Chuck Harris <cfhar...@erols.com> > > Subject: Re: [time-nuts] HP 5370A socket problem > > To: "Discussion of precise time and frequency measurement" > > <time-nuts@febo.com> > > Date: Wednesday, 20 May, 2009, 5:06 AM > > Hi Didier, > > > > I have never doubted for one moment that the sockets were causing > > your problems, I just wonder how prevalent the failure is > > in the > > universe of 5370's. I have HP equipment that is both > > newer and > > older than my 5370A, that has the same sockets. It > > would not > > surprise me at all to find the 5370B has the same exact > > sockets > > too. > > > > Double sided boards are a treat to work on with > > desoldering > > equipment. Multilayer boards suck up so much heat > > that they > > are a real problem. It helps to cook them on an IR > > preheater for > > a while before removing parts. > > > > -Chuck Harris > > > > Didier wrote: > > > Hi Chuck, > > > > > > I agree, I could not see anything obvious that would > > indicate these > > > particular sockets would cause problems, other than > > they certainly looked > > > cheap, even considering the date of manufacture. The > > contact pressure was > > > quite considerable, based on how hard it was to pull > > the chips out, so it > > > probably was not a bad contact between the socket and > > the pins. There are a > > > bunch of chips on sockets, and I never tried to find > > out if a particular > > > chip was causing the problem. I replaced all the > > sockets (except the PAL, I > > > did not have a socket for him.) > > > > > > The good news is that the PWB has very thin traces > > (requiring little heat), > > > and the holes are fairly wide, so unsoldering the > > sockets was a piece of > > > cake, with the right tool. I did each unit in about 30 > > minutes, all > > > included. The easiest was to remove the plastic part > > of the socket BEFORE > > > unsoldering the contacts. It comes off easily when you > > pull on it. Then each > > > contact can be removed individually with minimum > > stress on the board. > > > > > > One of my two units had evidence of having been in > > uncontrolled storage for > > > at least some time before I got it. The case was very > > dirty, inside the unit > > > was dusty but relatively clean. The other was > > relatively clean inside and > > > out. > > > > > > One thing for sure, is that until I replaced the > > sockets, the units would > > > only work a few days at a time, and wiggling and > > reseating the PROMs would > > > fix the problem each time, until next time. > > > > > > Didier > > > > > >> -----Original Message----- > > >> From: time-nuts-boun...@febo.com > > [mailto:time-nuts-boun...@febo.com] > > On Behalf Of Chuck Harris > > >> Sent: Tuesday, May 19, 2009 7:52 PM > > >> To: Discussion of precise time and frequency > > measurement > > >> Subject: Re: [time-nuts] HP 5370A socket problem > > >> > > >> Hi Didier, > > >> > > >> I just had a look in mine, and it uses plain old > > TI sockets. They may, or may not be gold (I didn't > > look that carefully). My unit is S/N 2217A01399, so it > > sits in the middle of your two units. > > >> > > >> I know that my unit is special (because it is > > mine, of course ;-), but I just don't think it is all > *that* special. > > I have seen the same TI sockets used on so many different > instruments > > --I would bet more than half the stuff in my shop has them-- They > > seem to work more often than not. > > >> > > >> -Chuck Harris > > > > > > > > > _______________________________________________ > > > 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. > > > > > > > _______________________________________________ > > 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. > > > > > > > _______________________________________________ > 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. _______________________________________________ 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.
