excellent fix, and you, hopefully, improved your soldering technique! On Fri, 19 Jan 2024 at 17:46, D. Hugh Redelmeier via talk <[email protected]> wrote:
> My LASER printer / scanner, a Brother MFC-L2729DW, would not power on. > Normally something like this is due to a power supply failure, but I > googled and found this: > > <https://www.youtube.com/watch?v=OgkHv1c01tQ> > > (The video is incomplete; there is another one that is linked from the > first, but all the useful info is in the first.) > > Following his instructions, I found that I could reset the machine to > work. But he said that it would fail again on a power failure or even > just turning it off. Furthermore, doing this too many times breaks the > printer. > > It turns out that settings are kept in a RAM that is powered by a > supercapacitor (instead of a battery). Furthermore, that > supercapacitor wears out. All you need to do to fix the printer is > to replace the supercapacitor. > > The video claims all recent Brother printers have these > supercapacitors. > > The video shows you how the replace the supercapacitor. You need a > new supercapacitor, which he will sell you. > > Armed with this information, I > > - bought a suitable supercapacitor from digikey.ca (cheaper and faster > than ordering from Australia). Actually I bought a slightly smaller > one, but that seems to be OK. The original was 0.33F, 5.5V. > I paid $3.48 for two, plus $8.00 shipping, plus HST. > > - pulled apart the printer, as per video > > - hacked out the old supercapacitor and soldered (badly) the new > supercapacitor. (Doing the job right would have required removing > the circuit board. Instead, I left the old supercapacitor's legs > and soldered the new one's legs to the old ones.) > > - struggled to get the plastic panel back in place. > > It works. > --- > Post to this mailing list [email protected] > Unsubscribe from this mailing list > https://gtalug.org/mailman/listinfo/talk >
--- Post to this mailing list [email protected] Unsubscribe from this mailing list https://gtalug.org/mailman/listinfo/talk
