The 105A was built without a battery. The 105B has a battery and charger. I have a 105B that had the failed battery removed before I bought it. It works fine. I have it on a UPS; it survived our just-finished NorCal power shutdown just fine.
Jeremy On Fri, Oct 11, 2019 at 7:01 AM Scott McGrath <[email protected]> wrote: > As one who owns a 105 i had the battery properly rebuilt and basically > have it on low rate charge and periodically discharge the battery > > When rebuilding a 105 battery it’s important to replicate its > characteristics > > Remember HP also intended I believe that the battery would also serve as a > filter for the power supply. As I dont recall any version of the 105 > without a battery. > > > > On Oct 10, 2019, at 4:50 PM, Taka Kamiya via time-nuts < > [email protected]> wrote: > > The fact that 25V supply is dropping to 23.4V shows it is drawing far more > current than it is rated. I am assuming this is a regulated power supply. > Does the power brick actually shuts down at 500mA or does it let the the > voltage drop and try to supply what it can? Maybe one or more Nicad has an > internal short? That will cause and over-voltage situation per battery and > thus over-current. I've recently seen a brick power supply go into > oscillation and produce 3x rated voltage when too much current was drawn. > (and blew the circuit) > > Also, different batteries has different charging rates. As far as 105B > document goes, it says 24V 0.5Amp supply but that is for default > configuration. Designed charge rate is 390mA (page 3-4) and is current > controlled by A5Q3. > > I would actually measure how much current is drawn there. Since the fuse > is already blown, just put an am-meter across the fuse and see.... > > --------------------------------------- > (Mr.) Taka Kamiya > KB4EMF / ex JF2DKG > > > On Thursday, October 10, 2019, 4:00:41 PM EDT, Roy Thistle < > [email protected]> wrote: > > Hi All: > A 105B (quartz oscillator) is blowing the 1A fuse, after it is on about 1 > hour. > The fuse appears to have just melted (not a black mark as the result of a > flash, in the case of a high current short.)… just looks like the fuse wire > (inside the glass capsule) melted into some little blobs, for about 1/4 > the fuse length, near the middle. It wasn't a fast-blo or slow-blo fuse... > just the normal kind. > I think the unit is drawing just a little too much current, as the result > of the batteries needing charging (I had the fast charge option on when the > fuse blew.) And so, the fuse heated up, and finally melted. Not sure why > the batteries were not charging normally... but 20.1 volts is what I > measured across the pack, initially, and 23.4 V after about 45 min of > charging. > I am charging the batters, from a power cube, at 510 ma, and dropping > (cube gives 25V, 500mA max)… the batteries are 20 C size NiCads, wired in > series... that of course is a retrofit. > I don't want to put another fuse in, and blow that too, without some > reasonable explanation of why the first one failed! > Please, any comments, or hints/suggestions... much appreciated. > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > -- Jeremy Nichols Sent from my iPad 6. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
