Empathy List Archives

BG

Bill Gold

Sun, Nov 6, 2011 4:02 PM

Joe:

After opening my meter and trying to get the NVRAM out of the sockets I used I have changed my mind and IMHO there would be no way, in normal shipping and handling, that these NVRAM would ever come out of their sockets.  I cannot remove them with my fingers by just pulling upwards and I almost can't get them out by rocking them back and forth in the sockets.  It is easier to remove the ribbon cables than it is to get the NVRAM out of these sockets.  If the meter took a G force shock sufficient to cause the NVRAM to come out of their sockets, then the meter would probably be non operational also and would require extensive repairs, once the NVRAM was put back into the sockets after the shock.

I can't identify the brand of "machined" sockets I used but they are very similar to the "Mill-Max" brand in the Allied catalog.  Mine are simply branded with a "S", with a bar on the top and bottom of the "S" but not connected to the "S".

I would have no problem shipping my 3458A to Loveland with these sockets for the NVRAM, and even better if I used the shipping box provided by Agilent.

Bill

Joe: After opening my meter and trying to get the NVRAM out of the sockets I used I have changed my mind and IMHO there would be no way, in normal shipping and handling, that these NVRAM would ever come out of their sockets. I cannot remove them with my fingers by just pulling upwards and I almost can't get them out by rocking them back and forth in the sockets. It is easier to remove the ribbon cables than it is to get the NVRAM out of these sockets. If the meter took a G force shock sufficient to cause the NVRAM to come out of their sockets, then the meter would probably be non operational also and would require extensive repairs, once the NVRAM was put back into the sockets after the shock. I can't identify the brand of "machined" sockets I used but they are very similar to the "Mill-Max" brand in the Allied catalog. Mine are simply branded with a "S", with a bar on the top and bottom of the "S" but not connected to the "S". I would have no problem shipping my 3458A to Loveland with these sockets for the NVRAM, and even better if I used the shipping box provided by Agilent. Bill

S

shalimr9@gmail.com

Sun, Nov 6, 2011 4:22 PM

I think the main issue with sockets is long term reliability. The 5370 is a good example. Both units I have suffered from bad socket syndrome, even though it took a crowbar to pull the chips out. Contact pressure was not lacking, but corrosion set in anyway. After replacing the cheap (and old) original sockets with new sockets with machined contacts, problems went away. A painstaking job, but well worth it.

Didier KO4BB

Sent from my BlackBerry Wireless thingy while I do other things...

-----Original Message-----
From: "Bill Gold" wpgold3637@att.net
Sender: volt-nuts-bounces@febo.com
Date: Sun, 6 Nov 2011 08:02:56
To: volt-nuts@febo.com
Reply-To: Discussion of precise voltage measurement volt-nuts@febo.com
Subject: Re: [volt-nuts] 3458A - To Modify or Not To Modify?

Joe:

After opening my meter and trying to get the NVRAM out of the sockets I used I have changed my mind and IMHO there would be no way, in normal shipping and handling, that these NVRAM would ever come out of their sockets.  I cannot remove them with my fingers by just pulling upwards and I almost can't get them out by rocking them back and forth in the sockets.  It is easier to remove the ribbon cables than it is to get the NVRAM out of these sockets.  If the meter took a G force shock sufficient to cause the NVRAM to come out of their sockets, then the meter would probably be non operational also and would require extensive repairs, once the NVRAM was put back into the sockets after the shock.

I can't identify the brand of "machined" sockets I used but they are very similar to the "Mill-Max" brand in the Allied catalog.  Mine are simply branded with a "S", with a bar on the top and bottom of the "S" but not connected to the "S".

I would have no problem shipping my 3458A to Loveland with these sockets for the NVRAM, and even better if I used the shipping box provided by Agilent.

Bill

volt-nuts mailing list -- volt-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.

I think the main issue with sockets is long term reliability. The 5370 is a good example. Both units I have suffered from bad socket syndrome, even though it took a crowbar to pull the chips out. Contact pressure was not lacking, but corrosion set in anyway. After replacing the cheap (and old) original sockets with new sockets with machined contacts, problems went away. A painstaking job, but well worth it. Didier KO4BB Sent from my BlackBerry Wireless thingy while I do other things... -----Original Message----- From: "Bill Gold" <wpgold3637@att.net> Sender: volt-nuts-bounces@febo.com Date: Sun, 6 Nov 2011 08:02:56 To: <volt-nuts@febo.com> Reply-To: Discussion of precise voltage measurement <volt-nuts@febo.com> Subject: Re: [volt-nuts] 3458A - To Modify or Not To Modify? Joe: After opening my meter and trying to get the NVRAM out of the sockets I used I have changed my mind and IMHO there would be no way, in normal shipping and handling, that these NVRAM would ever come out of their sockets. I cannot remove them with my fingers by just pulling upwards and I almost can't get them out by rocking them back and forth in the sockets. It is easier to remove the ribbon cables than it is to get the NVRAM out of these sockets. If the meter took a G force shock sufficient to cause the NVRAM to come out of their sockets, then the meter would probably be non operational also and would require extensive repairs, once the NVRAM was put back into the sockets after the shock. I can't identify the brand of "machined" sockets I used but they are very similar to the "Mill-Max" brand in the Allied catalog. Mine are simply branded with a "S", with a bar on the top and bottom of the "S" but not connected to the "S". I would have no problem shipping my 3458A to Loveland with these sockets for the NVRAM, and even better if I used the shipping box provided by Agilent. Bill _______________________________________________ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.

JL

J. L. Trantham

Sun, Nov 6, 2011 6:07 PM

I really appreciate everyone's thoughts about this. If I do it, I will
certainly use gold plated sockets. I have some of those on the shelf. I
don't believe they are 'machined' though.

I'll look at the Mill-Max items and see if I can get a set ordered.

My only hesitancy is that it is such a nice unit coupled with my desire to
keep equipment 'original' and the potential to damage the meter. However,
if I get the sockets installed, harvest the data from the NVRAM's, program a
new set of NVRAM's, install those then off to HP for their $550 cal and it
all works, I think that would be my preference. If it fails, then the
repair.

I have added sockets to a number of other boards in other HP equipment but
never anything quite as expensive as the 3458A.

Solder suckers and desolder braid have been my tools. I'll have to also
look at the possibility of adding a 'vacuum' type desolder iron. I have a
real cheapie that uses only a bulb that I have never been particularly fond
of but perhaps I could hook it up to an external vacuum then trigger the
vacuum at the appropriate time.

Joe

-----Original Message-----
From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] On
Behalf Of shalimr9@gmail.com
Sent: Sunday, November 06, 2011 10:22 AM
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] 3458A - To Modify or Not To Modify?

I think the main issue with sockets is long term reliability. The 5370 is a
good example. Both units I have suffered from bad socket syndrome, even
though it took a crowbar to pull the chips out. Contact pressure was not
lacking, but corrosion set in anyway. After replacing the cheap (and old)
original sockets with new sockets with machined contacts, problems went
away. A painstaking job, but well worth it.

Didier KO4BB

Sent from my BlackBerry Wireless thingy while I do other things...

-----Original Message-----
From: "Bill Gold" wpgold3637@att.net
Sender: volt-nuts-bounces@febo.com
Date: Sun, 6 Nov 2011 08:02:56
To: volt-nuts@febo.com
Reply-To: Discussion of precise voltage measurement volt-nuts@febo.com
Subject: Re: [volt-nuts] 3458A - To Modify or Not To Modify?

Joe:

After opening my meter and trying to get the NVRAM out of the sockets I

used I have changed my mind and IMHO there would be no way, in normal
shipping and handling, that these NVRAM would ever come out of their
sockets. I cannot remove them with my fingers by just pulling upwards and I
almost can't get them out by rocking them back and forth in the sockets. It
is easier to remove the ribbon cables than it is to get the NVRAM out of
these sockets. If the meter took a G force shock sufficient to cause the
NVRAM to come out of their sockets, then the meter would probably be non
operational also and would require extensive repairs, once the NVRAM was put
back into the sockets after the shock.

I can't identify the brand of "machined" sockets I used but they are

very similar to the "Mill-Max" brand in the Allied catalog. Mine are simply
branded with a "S", with a bar on the top and bottom of the "S" but not
connected to the "S".

I would have no problem shipping my 3458A to Loveland with these sockets

for the NVRAM, and even better if I used the shipping box provided by
Agilent.

Bill

volt-nuts mailing list -- volt-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.

I really appreciate everyone's thoughts about this. If I do it, I will certainly use gold plated sockets. I have some of those on the shelf. I don't believe they are 'machined' though. I'll look at the Mill-Max items and see if I can get a set ordered. My only hesitancy is that it is such a nice unit coupled with my desire to keep equipment 'original' and the potential to damage the meter. However, if I get the sockets installed, harvest the data from the NVRAM's, program a new set of NVRAM's, install those then off to HP for their $550 cal and it all works, I think that would be my preference. If it fails, then the repair. I have added sockets to a number of other boards in other HP equipment but never anything quite as expensive as the 3458A. Solder suckers and desolder braid have been my tools. I'll have to also look at the possibility of adding a 'vacuum' type desolder iron. I have a real cheapie that uses only a bulb that I have never been particularly fond of but perhaps I could hook it up to an external vacuum then trigger the vacuum at the appropriate time. Joe -----Original Message----- From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] On Behalf Of shalimr9@gmail.com Sent: Sunday, November 06, 2011 10:22 AM To: Discussion of precise voltage measurement Subject: Re: [volt-nuts] 3458A - To Modify or Not To Modify? I think the main issue with sockets is long term reliability. The 5370 is a good example. Both units I have suffered from bad socket syndrome, even though it took a crowbar to pull the chips out. Contact pressure was not lacking, but corrosion set in anyway. After replacing the cheap (and old) original sockets with new sockets with machined contacts, problems went away. A painstaking job, but well worth it. Didier KO4BB Sent from my BlackBerry Wireless thingy while I do other things... -----Original Message----- From: "Bill Gold" <wpgold3637@att.net> Sender: volt-nuts-bounces@febo.com Date: Sun, 6 Nov 2011 08:02:56 To: <volt-nuts@febo.com> Reply-To: Discussion of precise voltage measurement <volt-nuts@febo.com> Subject: Re: [volt-nuts] 3458A - To Modify or Not To Modify? Joe: After opening my meter and trying to get the NVRAM out of the sockets I used I have changed my mind and IMHO there would be no way, in normal shipping and handling, that these NVRAM would ever come out of their sockets. I cannot remove them with my fingers by just pulling upwards and I almost can't get them out by rocking them back and forth in the sockets. It is easier to remove the ribbon cables than it is to get the NVRAM out of these sockets. If the meter took a G force shock sufficient to cause the NVRAM to come out of their sockets, then the meter would probably be non operational also and would require extensive repairs, once the NVRAM was put back into the sockets after the shock. I can't identify the brand of "machined" sockets I used but they are very similar to the "Mill-Max" brand in the Allied catalog. Mine are simply branded with a "S", with a bar on the top and bottom of the "S" but not connected to the "S". I would have no problem shipping my 3458A to Loveland with these sockets for the NVRAM, and even better if I used the shipping box provided by Agilent. Bill _______________________________________________ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. _______________________________________________ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.

BS

Bob Smither

Sun, Nov 6, 2011 7:07 PM

J. L. Trantham wrote:

<snip>

Solder suckers and desolder braid have been my tools. I'll have to also
look at the possibility of adding a 'vacuum' type desolder iron. I have a
real cheapie that uses only a bulb that I have never been particularly fond
of but perhaps I could hook it up to an external vacuum then trigger the
vacuum at the appropriate time.

I have a Pace vacuum desoldering station that has served for many years.
Recently it seems to have lost its "oomph" and I bought a Hakko 808 unit:

http://www.frys.com/product/2760813?site=sr:SEARCH:MAIN_RSLT_PG

A little pricey, but I have been very happy with the Hakko unit.

--

---=====
Bob Smither, PhD Circuit Concepts, Inc.

             AT&T - Your world. Delivered. To the NSA.
               http://www.eff.org/legal/cases/hepting

Smither@C-C-I.Com http://www.C-C-I.Com 281-331-2744

---=====

J. L. Trantham wrote: <snip> > Solder suckers and desolder braid have been my tools. I'll have to also > look at the possibility of adding a 'vacuum' type desolder iron. I have a > real cheapie that uses only a bulb that I have never been particularly fond > of but perhaps I could hook it up to an external vacuum then trigger the > vacuum at the appropriate time. I have a Pace vacuum desoldering station that has served for many years. Recently it seems to have lost its "oomph" and I bought a Hakko 808 unit: http://www.frys.com/product/2760813?site=sr:SEARCH:MAIN_RSLT_PG A little pricey, but I have been very happy with the Hakko unit. -- ======================================================================= Bob Smither, PhD Circuit Concepts, Inc. AT&T - Your world. Delivered. To the NSA. http://www.eff.org/legal/cases/hepting Smither@C-C-I.Com http://www.C-C-I.Com 281-331-2744 =======================================================================

PK

Poul-Henning Kamp

Sun, Nov 6, 2011 8:03 PM

In message D3F58708FC39409DA31AA43E1F886658@S0028384766, "J. L. Trantham" wri
tes:

However,
if I get the sockets installed, harvest the data from the NVRAM's, program a
new set of NVRAM's, install those then off to HP for their $550 cal and it
all works, I think that would be my preference. If it fails, then the
repair.

Let me just clarify: You only need to bother with the single 2Kx8
CMOSRAM.

The other two NVRAMs are just so that your downloaded programs and
preferred settings don't disappear because you turn the instrument
off.

--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.

In message <D3F58708FC39409DA31AA43E1F886658@S0028384766>, "J. L. Trantham" wri tes: >However, >if I get the sockets installed, harvest the data from the NVRAM's, program a >new set of NVRAM's, install those then off to HP for their $550 cal and it >all works, I think that would be my preference. If it fails, then the >repair. Let me just clarify: You only need to bother with the single 2Kx8 CMOSRAM. The other two NVRAMs are just so that your downloaded programs and preferred settings don't disappear because you turn the instrument off. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.

JL

J. L. Trantham

Sun, Nov 6, 2011 9:44 PM

Just to make sure I understand, since they are all DALLAS chips (two
DS1230Y-150 for 'program memory', and a DS1220Y-150 for 'cal memory'), with
their internal batteries, they all will die in the future and that 'memory
of programs' function will be lost. So, therefore, it seems that they will
need to be replaced from time to time (mine are 14 years old) and since I am
going to need to remove them to replace them, why not place a socket?

I agree that only the smaller one is needed for the 'cal' memory.

Joe

-----Original Message-----
From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] On
Behalf Of Poul-Henning Kamp
Sent: Sunday, November 06, 2011 2:04 PM
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] 3458A - To Modify or Not To Modify?

In message D3F58708FC39409DA31AA43E1F886658@S0028384766, "J. L. Trantham"
wri
tes:

However,
if I get the sockets installed, harvest the data from the NVRAM's, program

a

new set of NVRAM's, install those then off to HP for their $550 cal and it
all works, I think that would be my preference. If it fails, then the
repair.

Let me just clarify: You only need to bother with the single 2Kx8
CMOSRAM.

The other two NVRAMs are just so that your downloaded programs and
preferred settings don't disappear because you turn the instrument
off.

--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.

volt-nuts mailing list -- volt-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.

Just to make sure I understand, since they are all DALLAS chips (two DS1230Y-150 for 'program memory', and a DS1220Y-150 for 'cal memory'), with their internal batteries, they all will die in the future and that 'memory of programs' function will be lost. So, therefore, it seems that they will need to be replaced from time to time (mine are 14 years old) and since I am going to need to remove them to replace them, why not place a socket? I agree that only the smaller one is needed for the 'cal' memory. Joe -----Original Message----- From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] On Behalf Of Poul-Henning Kamp Sent: Sunday, November 06, 2011 2:04 PM To: Discussion of precise voltage measurement Subject: Re: [volt-nuts] 3458A - To Modify or Not To Modify? In message <D3F58708FC39409DA31AA43E1F886658@S0028384766>, "J. L. Trantham" wri tes: >However, >if I get the sockets installed, harvest the data from the NVRAM's, program a >new set of NVRAM's, install those then off to HP for their $550 cal and it >all works, I think that would be my preference. If it fails, then the >repair. Let me just clarify: You only need to bother with the single 2Kx8 CMOSRAM. The other two NVRAMs are just so that your downloaded programs and preferred settings don't disappear because you turn the instrument off. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.

PK

Poul-Henning Kamp

Sun, Nov 6, 2011 10:19 PM

In message ABBBD83DE5B74F8885F0F686C7ACD9D3@cardiac5f772ce, "J. L. Trantham"
writes:

Just to make sure I understand, since they are all DALLAS chips (two
DS1230Y-150 for 'program memory', and a DS1220Y-150 for 'cal memory'), with
their internal batteries, they all will die in the future and that 'memory
of programs' function will be lost. So, therefore, it seems that they will
need to be replaced from time to time (mine are 14 years old) and since I am
going to need to remove them to replace them, why not place a socket?

Because in all likelyhood you will not care for the functionality
which the DS1230Y's deliver, so rather than risk another 56 pins
to unsolder, you can just leave them in, with no (relevant) loss
of functionality.

--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.

In message <ABBBD83DE5B74F8885F0F686C7ACD9D3@cardiac5f772ce>, "J. L. Trantham" writes: >Just to make sure I understand, since they are all DALLAS chips (two >DS1230Y-150 for 'program memory', and a DS1220Y-150 for 'cal memory'), with >their internal batteries, they all will die in the future and that 'memory >of programs' function will be lost. So, therefore, it seems that they will >need to be replaced from time to time (mine are 14 years old) and since I am >going to need to remove them to replace them, why not place a socket? Because in all likelyhood you will not care for the functionality which the DS1230Y's deliver, so rather than risk another 56 pins to unsolder, you can just leave them in, with no (relevant) loss of functionality. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.

JL

J. L. Trantham

Sun, Nov 6, 2011 11:13 PM

I agree.

However, if I am going 'all in' on damage to the board by placing sockets
for the EPROM and the DS1220Y, why not go 'all the way' and also do the
other DALLAS chips?

Interestingly, I got four HM62256LP-10 chips off theBay, inserted them in
U123-U126, and, miraculously, 'OPT 1,0' appeared. I noted that the sockets
are plain 'AMP' closed frame sockets with just plain 'tin' (I think?)
connectors. I think I will use the same socket, but with Gold Plating, for
the EPROM and the DALLAS chips as opposed to the Mill-Max.

Any thoughts?

Joe

-----Original Message-----
From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] On
Behalf Of Poul-Henning Kamp
Sent: Sunday, November 06, 2011 4:20 PM
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] 3458A - To Modify or Not To Modify?

In message ABBBD83DE5B74F8885F0F686C7ACD9D3@cardiac5f772ce, "J. L.
Trantham"
writes:

Just to make sure I understand, since they are all DALLAS chips (two
DS1230Y-150 for 'program memory', and a DS1220Y-150 for 'cal memory'), with
their internal batteries, they all will die in the future and that 'memory
of programs' function will be lost. So, therefore, it seems that they will
need to be replaced from time to time (mine are 14 years old) and since I

am

going to need to remove them to replace them, why not place a socket?

Because in all likelyhood you will not care for the functionality
which the DS1230Y's deliver, so rather than risk another 56 pins
to unsolder, you can just leave them in, with no (relevant) loss
of functionality.

--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.

volt-nuts mailing list -- volt-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.

I agree. However, if I am going 'all in' on damage to the board by placing sockets for the EPROM and the DS1220Y, why not go 'all the way' and also do the other DALLAS chips? Interestingly, I got four HM62256LP-10 chips off theBay, inserted them in U123-U126, and, miraculously, 'OPT 1,0' appeared. I noted that the sockets are plain 'AMP' closed frame sockets with just plain 'tin' (I think?) connectors. I think I will use the same socket, but with Gold Plating, for the EPROM and the DALLAS chips as opposed to the Mill-Max. Any thoughts? Joe -----Original Message----- From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] On Behalf Of Poul-Henning Kamp Sent: Sunday, November 06, 2011 4:20 PM To: Discussion of precise voltage measurement Subject: Re: [volt-nuts] 3458A - To Modify or Not To Modify? In message <ABBBD83DE5B74F8885F0F686C7ACD9D3@cardiac5f772ce>, "J. L. Trantham" writes: >Just to make sure I understand, since they are all DALLAS chips (two >DS1230Y-150 for 'program memory', and a DS1220Y-150 for 'cal memory'), with >their internal batteries, they all will die in the future and that 'memory >of programs' function will be lost. So, therefore, it seems that they will >need to be replaced from time to time (mine are 14 years old) and since I am >going to need to remove them to replace them, why not place a socket? Because in all likelyhood you will not care for the functionality which the DS1230Y's deliver, so rather than risk another 56 pins to unsolder, you can just leave them in, with no (relevant) loss of functionality. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.

PK

Poul-Henning Kamp

Sun, Nov 6, 2011 11:28 PM

In message C955030251514D26AE5A973DBA8D29DD@cardiac5f772ce, "J. L. Trantham"
writes:

However, if I am going 'all in' on damage to the board by placing sockets
for the EPROM and the DS1220Y, why not go 'all the way' and also do the
other DALLAS chips?

Well, to minimize the risk that you mess up one of the solderpads for
instance.

Interestingly, I got four HM62256LP-10 chips off theBay, inserted them in
U123-U126, and, miraculously, 'OPT 1,0' appeared.

It's not magic, it is code that looks for RAM in the relevant
memory-range and says "I have OPT 1" if it finds it :-)

--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.

In message <C955030251514D26AE5A973DBA8D29DD@cardiac5f772ce>, "J. L. Trantham" writes: >However, if I am going 'all in' on damage to the board by placing sockets >for the EPROM and the DS1220Y, why not go 'all the way' and also do the >other DALLAS chips? Well, to minimize the risk that you mess up one of the solderpads for instance. >Interestingly, I got four HM62256LP-10 chips off theBay, inserted them in >U123-U126, and, miraculously, 'OPT 1,0' appeared. It's not magic, it is code that looks for RAM in the relevant memory-range and says "I have OPT 1" if it finds it :-) -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.

CH

Chuck Harris

Sun, Nov 6, 2011 11:42 PM

The answer to a Pace desoldering station that has lost its "oomph" is
to let it pump alcohol for a while. What happens is the rosin flux vapors
get into the pump and solidify. That tends to cause the spring loaded
graphite vanes in the pump to get sticky and lag in their ability to follow
the cylinder walls as the pump spins...you lose your pumping action.

Pumping the alcohol dissolves the rosin, and frees the graphite vanes, and
restores pumping efficiency.

-Chuck Harris

Bob Smither wrote:

J. L. Trantham wrote:

<snip>

Solder suckers and desolder braid have been my tools. I'll have to also
look at the possibility of adding a 'vacuum' type desolder iron. I have a
real cheapie that uses only a bulb that I have never been particularly fond
of but perhaps I could hook it up to an external vacuum then trigger the
vacuum at the appropriate time.

I have a Pace vacuum desoldering station that has served for many years. Recently it
seems to have lost its "oomph" and I bought a Hakko 808 unit:

http://www.frys.com/product/2760813?site=sr:SEARCH:MAIN_RSLT_PG

A little pricey, but I have been very happy with the Hakko unit.

The answer to a Pace desoldering station that has lost its "oomph" is to let it pump alcohol for a while. What happens is the rosin flux vapors get into the pump and solidify. That tends to cause the spring loaded graphite vanes in the pump to get sticky and lag in their ability to follow the cylinder walls as the pump spins...you lose your pumping action. Pumping the alcohol dissolves the rosin, and frees the graphite vanes, and restores pumping efficiency. -Chuck Harris Bob Smither wrote: > J. L. Trantham wrote: > > <snip> > >> Solder suckers and desolder braid have been my tools. I'll have to also >> look at the possibility of adding a 'vacuum' type desolder iron. I have a >> real cheapie that uses only a bulb that I have never been particularly fond >> of but perhaps I could hook it up to an external vacuum then trigger the >> vacuum at the appropriate time. > > I have a Pace vacuum desoldering station that has served for many years. Recently it > seems to have lost its "oomph" and I bought a Hakko 808 unit: > > http://www.frys.com/product/2760813?site=sr:SEARCH:MAIN_RSLT_PG > > A little pricey, but I have been very happy with the Hakko unit.

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Re: [volt-nuts] 3458A - To Modify or Not To Modify?