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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Cmos battery in Micron Transpoet Trek 2
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 |
#2
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Cmos battery in Micron Transpoet Trek 2
mike wrote in message
... 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 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/ |
#3
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Cmos battery in Micron Transpoet Trek 2
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 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/ |
#4
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followup to: Cmos battery in Micron Transport Trek 2
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 |
#5
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followup to: Cmos battery in Micron Transport Trek 2
mike wrote in message
... 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 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/ |
#6
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followup to: Cmos battery in Micron Transport Trek 2
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 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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