rmfowler@texrex.uucp (Rex Fowler) (12/03/90)
On my 2 Meg motherboard at location C38, there is a capacitor whose legs are touching. Can somebody tell me if they have the same situation. The capacitor is right next to the 1st row of 256K memory chips(location A2). Since I've been having so many 'parity error' crashes, I'm hoping that maybe this is the culprit. Here is a basic diagram of what I see: ------ / \ | | | | \ / ------ / \ | / | / |/ <---------- Touching right here!! /\ / \ / \ solder solder I know the drawing sucks but I think it gets the idea across. Is this something that I should be worried about (causing my crashes?) or is it like this by design? -- Rex Fowler <rmfowler%texrex@cirr.com> UUCP: egsner!texrex!rmfowler
thad@cup.portal.com (Thad P Floryan) (12/03/90)
rmfowler@texrex.uucp (Rex Fowler) in <1990Dec3.045132.399@texrex.uucp> writes:
On my 2 Meg motherboard at location C38, there is a capacitor whose
legs are touching. ...
Since I've been having so many 'parity error' crashes, I'm hoping that
maybe this is the culprit.
That was a GOOD diagram you drew! Electronic components are NOT designed
for aerial or elevated connections like you depict, so I'd suggest using a
toothpick (or some other small, non-conducting tool) and "pry" those legs
apart WITH THE SYSTEM POWERED OFF.
"Chances are" (and DON'T ask me to sing that!) there is no permanent damage.
If you have a VOM or DVM you may wish to verify the +5VDC supply is still
within the +/- 5% tolerance (i.e. +5.25 to +4.75) and make any adjustments if
it is not.
Thad Floryan [ thad@cup.portal.com (OR) ..!sun!portal!cup.portal.com!thad ]hashemi@leadsv.UUCP (Rahmat O. Hashemi) (12/05/90)
In article <1990Dec3.045132.399@texrex.uucp> rmfowler@texrex.uucp (Rex Fowler) writes: >On my 2 Meg motherboard at location C38, there is a capacitor whose >legs are touching. Can somebody tell me if they have the same situation. >The capacitor is right next to the 1st row of 256K memory chips(location A2). > This could indeed be the cause of your problems. The capacitor is between the power/ground pins, so if the legs are intermittently touching each other, they are causing a power-to-grouns short. Hope that you did seperate the legs, and hope that helped you :-) .
rmfowler@texrex.uucp (Rex Fowler) (03/03/91)
On the rear right corner of my motherboard (underneath the metal shielding) there is a sticker with the words "test 5" on it. Has anyone else seen anything like this? Or did I get "lucky" and get some sort of "beta- motherboard"? Anyone know what it means? -- Rex Fowler <rmfowler%texrex@cirr.com> UUCP: egsner!texrex!rmfowler
thad@public.BTR.COM (Thaddeus P. Floryan) (03/03/91)
In article <1991Mar3.034413.649@texrex.uucp> rmfowler%texrex@cirr.com writes: >On the rear right corner of my motherboard (underneath the metal shielding) >there is a sticker with the words "test 5" on it. Has anyone else seen >anything like this? Or did I get "lucky" and get some sort of "beta- >motherboard"? > >Anyone know what it means? As I've stated before (as a result of researching the "DRUN Patch" for WD2010 usage), there are TWO (2) "thingies" which characterize each 3B1 motherboard: 1) the board schematic level. This is a number, in the copper, near the left rear portion of the topside of the motherboard. The "good" numbers will have, as their last parts, any of: -00222-00 -00225-00 -00230-00 A "bad" (obsolete) board will be, for example, a -00216-00. I have seen stickers placed over the "copper" number which further revise the board (perhaps due to one of the inner layers being revises) along the lines of -00236-00, etc. 2) the board revision level ("Rev.Level") with respect to the board schematic level, as a sticker near the volume control bearing the legend, for example, "REV. D" or "REV. C" or "REV. J", etc. A "REV.C" on the -00222-00 board is NOT THE SAME as a "REV.C" on a -00225-00 board. Part of the frustrations during my researching the "DRUN Patch" was not realizing (at first) BOTH numbers are required to "identify" a given board. As far as your "TEST 5" sticker goes, looks like simply a QA sticker and is nothing to be concerned about. The only time you should be sweating icicles is if your motherboard bears the dreaded -00216-00 schematic level! :-) Thad P.S. I hope this posting gets out; some 20+ postings I did between the hours of 1AM and 7AM Friday, March 1, seems to have gotten lost here at BTR during (or because of) the time when each posting was greeted by the phrase: "Your posting is spooled for later processing." Sheesh, b-news. Anyone know of any bugs in that regards? On SunOS? So if anyone thinks I've been silent recently, I have NOT. And I didn't save copies of what I posted (on many subjects). :-( Thad Floryan [ thad@btr.com (OR) {decwrl, mips, fernwood}!btr!thad ]