On 12/3/2014 7:09 AM, amdx wrote:
Happy Days,
A recap, I ordered an M48T86PC1 from China and it turned out to be
old stock, and the Lithium battery was dead.
I received a Dallas DS12887A Cmos Clock Lithium Battery from Mouser
as replacement for the M48T86PC1. I installed it and the computer
works just fine.
Next step, see if the computer will still run the HP 3330B Synthesizer
and the HP 3570A Network Analyzer under GPIB control.
Thanks for all the help,
Mikek
Reply by amdx●December 4, 20142014-12-04
On 12/4/2014 1:08 PM, Don Y wrote:
> On 12/4/2014 12:07 PM, Don Y wrote:
>>>>> I have the cover cut off the top. It exposed two more boxes inside.
>>>>> There is not a dimple in those. This did not come apart easy, I cut
>>>>> the cover
>>>>> and pried off some of it, the rest does not want to come off.
>>>>
>>> Next question would be, is the Dallas chip built the same way as
>>> the ST
>>> microelectronics chip? ie. do I grind on pin 16 and 20.
>
> Obviously, you want to screw with the OLD (known bad) chip, first!
>
Ya, I ground into it this morning. I found metal near pin 16 but,
I didn't find any metal at a reasonable depth near pin 20. I went deeper
than any of the pictures of grinding on the other chips. Over 3/32".
It doesn't make a lot of sense because internally there are two
compartments, the two pins are not in the same compartment. Pin 20 is
right a the seam between the two compartments.
I ordered a new chip from Mouser. I'll wait for it before doing any more.
Thanks, Mikek
Reply by Don Y●December 4, 20142014-12-04
On 12/4/2014 12:07 PM, Don Y wrote:
>>>> I have the cover cut off the top. It exposed two more boxes inside.
>>>> There is not a dimple in those. This did not come apart easy, I cut
>>>> the cover
>>>> and pried off some of it, the rest does not want to come off.
>>>
>> Next question would be, is the Dallas chip built the same way as the ST
>> microelectronics chip? ie. do I grind on pin 16 and 20.
Obviously, you want to screw with the OLD (known bad) chip, first!
Reply by Don Y●December 4, 20142014-12-04
On 12/4/2014 7:33 AM, amdx wrote:
> On 12/3/2014 12:49 PM, Don Y wrote:
>> On 12/2/2014 5:07 PM, amdx wrote:
>>> On 12/2/2014 5:14 PM, Don Y wrote:
>>>> On 12/2/2014 5:58 AM, amdx wrote:
>>>>> I'm not going to tear up this maybe new? 2003 or 2013 chip just to
>>>>> measure
>>>>> the battery.
>>>>
>>>> You don't need to destroy the chip to expose the battery connection.
>>>>
>>>> Dig up my previous post for URL to similar photos.
>>>
>>> I went back and found the link you posted, I don't think my IC is
>>> the same as in your link.
>>
>> Sorry, my bad.
>>
>> Try this:
>>
>> <http://www.hardwaresecrets.com/article/Replacing-the-Motherboard-Battery/81/3>
>>
>>
>> (after verifying that it does, in fact, pertain to the device(s) you have
>> in front of you)
>>
>>> I have the cover cut off the top. It exposed two more boxes inside.
>>> There is not a dimple in those. This did not come apart easy, I cut
>>> the cover
>>> and pried off some of it, the rest does not want to come off.
>>
> Next question would be, is the Dallas chip built the same way as the ST
> microelectronics chip? ie. do I grind on pin 16 and 20.
<shrug> Dunno. You also want to do this OUT of the circuit (as you have
no idea if those pins are N/C on the motherboard). And, if it confirms the
location of the cell, probably cut those legs so they can't connect to the
PCB.
(Where are you located?)
> I'll give it a try,If I can measure a voltage near 3v, I'm probably OK.
Remember, DVM not (analog) VOM. The latter will effectively kill the cell
in the time it takes you to measure.
Reply by amdx●December 4, 20142014-12-04
On 12/3/2014 12:49 PM, Don Y wrote:
> On 12/2/2014 5:07 PM, amdx wrote:
>> On 12/2/2014 5:14 PM, Don Y wrote:
>>> On 12/2/2014 5:58 AM, amdx wrote:
>>>> I'm not going to tear up this maybe new? 2003 or 2013 chip just to
>>>> measure
>>>> the battery.
>>>
>>> You don't need to destroy the chip to expose the battery connection.
>>>
>>> Dig up my previous post for URL to similar photos.
>>
>> I went back and found the link you posted, I don't think my IC is
>> the same as in your link.
>
> Sorry, my bad.
>
> Try this:
>
> <http://www.hardwaresecrets.com/article/Replacing-the-Motherboard-Battery/81/3>
>
>
> (after verifying that it does, in fact, pertain to the device(s) you have
> in front of you)
>
>> I have the cover cut off the top. It exposed two more boxes inside.
>> There is not a dimple in those. This did not come apart easy, I cut
>> the cover
>> and pried off some of it, the rest does not want to come off.
>
Next question would be, is the Dallas chip built the same way as the
ST microelectronics chip? ie. do I grind on pin 16 and 20.
I'll give it a try,If I can measure a voltage near 3v, I'm probably OK.
Mikek
Reply by Don Y●December 3, 20142014-12-03
On 12/2/2014 5:07 PM, amdx wrote:
> On 12/2/2014 5:14 PM, Don Y wrote:
>> On 12/2/2014 5:58 AM, amdx wrote:
>>> I'm not going to tear up this maybe new? 2003 or 2013 chip just to
>>> measure
>>> the battery.
>>
>> You don't need to destroy the chip to expose the battery connection.
>>
>> Dig up my previous post for URL to similar photos.
>
> I went back and found the link you posted, I don't think my IC is
> the same as in your link.
> I have the cover cut off the top. It exposed two more boxes inside.
> There is not a dimple in those. This did not come apart easy, I cut the cover
> and pried off some of it, the rest does not want to come off.
Reply by amdx●December 3, 20142014-12-03
On 12/3/2014 4:29 AM, Jasen Betts wrote:
> On 2014-12-02, amdx <nojunk@knology.net> wrote:
>> On 12/1/2014 11:53 PM, Jasen Betts wrote:
>>> On 2014-12-02, amdx <nojunk@knology.net> wrote:
>>>
>>>> Another route, any chance I could measure the battery voltage?
>>>
>>> Absolutely, I told you how last month.
>>>
>> You said,
>> "It's a regular 0.3" PDIP CMOS RTC chip potted with a lithium battery,
>> they can be opened and the chip connected to a replacable battery."
>>
>> I tore up as much of the cover as I could and have not got to the
>> battery. It is fitted between two PCI connectors with very little room
>> to maneuver.
>>
>> I'm not going to tear up this maybe new? 2003 or 2013 chip just to
>> measure the battery.
>> Thanks, Mikek
>
> just drill two small holes to reach the power pins and probe with some
> fine wire,
I only what to come off as just a little bit of a smart ass.
"just drill two small holes" about what size drill bit?
How deep do I need to drill?
"to reach the power pins" Does it matter where I drill these
"small" holes on this 3/4" x 1-1/4" chip so that I can probe the power pins?
Here's diagram showing where to cut on a DS1287 Clock chip.
http://www.mcamafia.de/mcapage0/jpg/ds1287rw.gif
I don't know that it is the same chip. it doesn't use all the pins,
But I'll grind on the chip I have out and see what I run into.
Mikek
Reply by Jasen Betts●December 3, 20142014-12-03
On 2014-12-02, amdx <nojunk@knology.net> wrote:
> On 12/1/2014 11:53 PM, Jasen Betts wrote:
>> On 2014-12-02, amdx <nojunk@knology.net> wrote:
>>
>>> Another route, any chance I could measure the battery voltage?
>>
>> Absolutely, I told you how last month.
>>
> You said,
> "It's a regular 0.3" PDIP CMOS RTC chip potted with a lithium battery,
> they can be opened and the chip connected to a replacable battery."
>
> I tore up as much of the cover as I could and have not got to the
> battery. It is fitted between two PCI connectors with very little room
> to maneuver.
>
> I'm not going to tear up this maybe new? 2003 or 2013 chip just to
> measure the battery.
> Thanks, Mikek
just drill two small holes to reach the power pins and probe with some
fine wire,
--
umop apisdn
Reply by amdx●December 2, 20142014-12-02
On 12/2/2014 5:14 PM, Don Y wrote:
> On 12/2/2014 5:58 AM, amdx wrote:
>> I'm not going to tear up this maybe new? 2003 or 2013 chip just to
>> measure
>> the battery.
>
> You don't need to destroy the chip to expose the battery connection.
>
> Dig up my previous post for URL to similar photos.
I went back and found the link you posted, I don't think my IC is
the same as in your link.
http://www.squirrel.com/squirrel/sun-nvram-hostid.faq.html#attach
I have the cover cut off the top. It exposed two more boxes inside.
There is not a dimple in those. This did not come apart easy, I cut the
cover and pried off some of it, the rest does not want to come off.
Thanks, Mikek
Reply by Don Y●December 2, 20142014-12-02
On 12/2/2014 5:58 AM, amdx wrote:
> I'm not going to tear up this maybe new? 2003 or 2013 chip just to measure
> the battery.
You don't need to destroy the chip to expose the battery connection.
Dig up my previous post for URL to similar photos.