Cmos battery in Micron Transpoet Trek 2

M

mike

Guest
First time in quite awhile that I've posted, usually I just lurk and
enjoy the tips and problem solutions I pick up here - hope you don't
mind me posting from Google...

I think the battery is getting low in this older laptop, (circa 1997)
and the main problem is that it's soldered to the motherboard. I
can't see any markings on it and the solder blobs holding it are
rather large (compared to any other solder joints on the board.

The battery is about 1/4 inch tall and about 3/8 inch in diameter, but
shows no ID numbers as mounted, would any one happen to be familiar
with this machine? I'm thinkinking of just adding a couple wires and
mounting a battery somewhere else, if I can confirm that it is a 3
volt battery (it reads about 1.7 volts and the computer losses time
pretty quick, several minutes every hour.

Thanks in advance for any ideas and /or information.

Mike Lightner
 
mike <mlightner@survivormail.com> wrote in message
news:c5b0845f-a2d3-4ea2-af54-f4e092a0ea4a@i28g2000prd.googlegroups.com...
First time in quite awhile that I've posted, usually I just lurk and
enjoy the tips and problem solutions I pick up here - hope you don't
mind me posting from Google...

I think the battery is getting low in this older laptop, (circa 1997)
and the main problem is that it's soldered to the motherboard. I
can't see any markings on it and the solder blobs holding it are
rather large (compared to any other solder joints on the board.

The battery is about 1/4 inch tall and about 3/8 inch in diameter, but
shows no ID numbers as mounted, would any one happen to be familiar
with this machine? I'm thinkinking of just adding a couple wires and
mounting a battery somewhere else, if I can confirm that it is a 3
volt battery (it reads about 1.7 volts and the computer losses time
pretty quick, several minutes every hour.

Thanks in advance for any ideas and /or information.

Mike Lightner
Click to expand...

Exactly the same as this PC I'm writing this on. 2 wires soldered to the
existing , in place, soldered-in battery and a 3V battery wrapped up and
stuck somewhere else. I forget what value of safety resistor I put in line ,
probably a
about 10K


--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/
 
N_Cook wrote:

Exactly the same as this PC I'm writing this on. 2 wires soldered to the
existing , in place, soldered-in battery and a 3V battery wrapped up and
stuck somewhere else. I forget what value of safety resistor I put in line ,
probably a
about 10K
Click to expand...
That's encouraging to hear - I guess these Transports (sorry 'bout
earlier typo) are pretty durable machines. Safety resistor sounds
good - I assume to protect the battery? how is it in the circuit?

Thanks muchly.
Mike

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/
Click to expand...
 
mike <mlightner@survivormail.com> wrote in message
news:9181d98d-11db-4ccd-bc51-6c29fe347989@k17g2000prn.googlegroups.com...
The battery addition was successful, I used a CR2032 and the socket
off a scrap MB, and put a 10K resistor in series with one of the wires
- found that that dropped the I-draw from about 50uA to around
30uA, and the laptop is now keeping the correct time again.

Thanks again,
Mike
Click to expand...

When I did that I could not be sure how the original battery would affect
things, would it quickly drain the new battery? But I did that on this pc
some years ago and the clock time still advances marginally, so presumed all
ok.


--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/
 
The battery addition was successful, I used a CR2032 and the socket
off a scrap MB, and put a 10K resistor in series with one of the wires
- found that that dropped the I-draw from about 50uA to around
30uA, and the laptop is now keeping the correct time again.

Thanks again,
Mike
 
N_Cook wrote:

When I did that I could not be sure how the original battery would affect
things, would it quickly drain the new battery? But I did that on this pc
some years ago and the clock time still advances marginally, so presumed all
ok.

I was kind of surprised that the current draw without the resistor was
Click to expand...
so low, but I wasn't monitoring the voltage at the same time so don't
know if it was holding steady or not - at any rate, good to hear that
it's apparently a long lasting repair.

Mike
 
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