lenny@icus.islp.ny.us (Lenny Tropiano) (06/18/89)
In article <40@docwrk.UUCP> srh@docwrk.UUCP (Steven R. Houser) writes: ... |>The machine I received is clean and works fine. It has "UNIX PC" on the |>monitor instead of "PC 7300". Also, "battery upgrade" was stamped on the |>carton. I'm not sure what this means, but I noticed that the backup |>battery actually keeps the clock running after the machine is turned off. |>My other 7300 doesn't do that. |> Basically it can mean one of two things ... one, is that they replaced the dead (or presumeably dead) lithium battery that is soldered to the motherboard. Or if they did what I think they did, they replaced the solder connections with some sort of AA battery case that will make it easier to replace batteries in the future. All UNIX pc's and 7300's *should* save the clock in hardware (assuming the battery still works, if your machine boots up to "January 1, 1970" it doesn't) ... -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
wjc@ho5cad.ATT.COM (Bill Carpenter) (06/18/89)
In article <726@icus.islp.ny.us> lenny@icus.islp.ny.us (Lenny Tropiano) writes: > |>Also, "battery upgrade" was stamped on the carton > > Basically it can mean one of two things ... one, is that they replaced > the dead (or presumeably dead) lithium battery that is soldered to the > motherboard. Or if they did what I think they did, they replaced the solder > connections with some sort of AA battery case that will make it easier I have a 7300 that came in a carton stamped "battery upgraded". When I opened it up, I found that instead of a flat "coin" battery, there was instead an axial-leaded thing about 3/4" long and 1/2" diameter. No socket; soldered in place. I don't know if "upgraded" means "replaced" or if the axial battery is really somehow better (which I guess could only mean it will last longer). -- Bill Carpenter att!ho5cad!wjc or attmail!bill
thad@cup.portal.com (Thad P Floryan) (06/20/89)
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 ]