dlp@akguc.ATT.COM (Dan Philen) (01/06/89)
I think that this question was answered some time ago, but I failed to copy it down. Question? What is involved in replacing the battery in a 7300 (3B1)? Is it soldered in; what is the replacement battery; what tricks or problems to watch out for; if its soldered in then can you put in a battery holder ? Thanks in advance for any helpful hints. Dan Philen akgua!dlp
mvadh@cbnews.ATT.COM (andrew.d.hay) (01/06/89)
In article <9608@akguc.ATT.COM> dlp@akguc.ATT.COM (Dan Philen) writes: >I think that this question was answered some time ago, but I failed >to copy it down. Question? What is involved in replacing the >battery in a 7300 (3B1)? Is it soldered in; what is the replacement >battery; what tricks or problems to watch out for; if its soldered >in then can you put in a battery holder ? >Thanks in advance for any helpful hints. it's a lithium cell, soldered in. the board was designed for a coin cell, but i've seen many types in there. i believe a coin cell holder would be an easy fit. -- Andrew Hay +------------------------------------------------------+ Apprentice Polymath | Yes, the wages of sin ARE death, but after they take | AT&T-BL Ward Hill MA | taxes out, it's kind of a tired feeling really | mvuxq.att.com!adh +------------------------------------------------------+
yren@phoenix.Princeton.EDU (Yong Ren) (07/06/89)
The battery in my unix-pc is dead for months. I opened the cover up and found that the battery is soldered on the board. What is the proper procedure to replace it? I know this must have been discussed on the net quite often. Well, I didn't read those postings carefully since I thought it still had several years of life ahead. Thanks in advance. - yren@phoenix.princeton.edu - yren@pucc.bitnet
thad@cup.portal.com (Thad P Floryan) (07/10/89)
I don't like to repost something so soon, but it seems the newsgroup expired
on Yong Ren's system, so here it comes again ...
From: thad@cup.portal.com (Thad P Floryan)
Newsgroups: unix-pc.general,comp.sys.att
Subject: Re: Battery Upgrade, what is it ... (was Re: VarTech 7300 deal)
Date: 20 Jun 89 07:15:25 GMT
Re: battery replacement in the UNIXPC ...
At last month's (Sunnyvale, CA) AT&T Computer User Group Meeting, UNIXPC SIG,
I replaced the battery in one member's UNIXPC as part of the evening's program.
The operation comprised:
1) opening the UNIXPC and stripping it down to the ground.
2) pulling the battery jumper pin
3) clipping out the old lithium battery
4) desoldering the two battery lead stubs, and cleaning out the holes with
solder wick
5) mounting and soldering a lithium battery holder
6) slipping a new battery into the holder
7) inserting the battery jumper pin
8) reassembling the entire system
9) powering up, booting with the diagnostic disk, setting the real time clock
10) rebooting from HD
Total parts cost: $1.99 for the battery (at Fry's), and $1.29 for the holder
(also from Fry's).
Parts list:
1) RayOVac Computer Clock Battery. "Lifex (tm) Lithium Replacement Battery for
Expansion Board Real Time Clocks." The generic part number is BR2325,
which is identical to the stock battery in the UNIXPC except it doesn't have
the two leads welded to it. These batteries are about the size of a US
quarter, and are claimed to have a 10-year shelf life; nominal 3 VDC.
2) Lithium battery holder. I don't know the manufacturer (since these are
bulk packaged by Fry's Electronics), but the underside of the holder bears
these markings:
MPD
U.S.A.
U.S.PAT.NO.
4,487,820
Needless to say, considering the silk screen on the motherboard, it appears
(to me) the motherboard was DESIGNED to have a socketed battery holder identical
to the one I installed; it was a perfect fit (no bending, etc.).
Once the battery is so socketed, future replacement would be on the order of
less than 10 minutes (to open the case, lift the metal cover, exchange the
batteries, and close it up.)
Thad Floryan [ thad@cup.portal.com (OR) ..!sun!portal!cup.portal.com!thad ]lenny@icus.islp.ny.us (Lenny Tropiano) (07/11/89)
In article <9282@phoenix.Princeton.EDU> yren@phoenix.Princeton.EDU () writes: |> |> The battery in my unix-pc is dead for months. I opened the cover up |>and found that the battery is soldered on the board. What is the proper |>procedure to replace it? I know this must have been discussed on the net |>quite often. Well, I didn't read those postings carefully since I thought |>it still had several years of life ahead. |> Thanks in advance. |> Certainly whatever you do, don't call the AT&T National Parts for this battery. Without my knowing, the company I work for (by day) called and bought one of these 3V lithium batteries... Paying a meer $13.00 ;-) Radio Shack sells them for ~$1.29 ... my suggestion is to carefully desolder the old battery (noting polarity) and solder a 2AA battery holder in its place. -Lenny -- Lenny Tropiano ICUS Software Systems [w] +1 (516) 589-7930 lenny@icus.islp.ny.us Telex; 154232428 ICUS [h] +1 (516) 968-8576 {ames,talcott,decuac,hombre,pacbell,sbcs}!icus!lenny attmail!icus!lenny ICUS Software Systems -- PO Box 1; Islip Terrace, NY 11752