Page 1 of 1

WTB: Cherokee PSU FOUND

Posted: Wed Feb 07, 2018 11:20 am
by JacquesT
    My Cherokee I bought on eBay went 'poof' after 2 months, so I'm looking for a replacement. Due to weight I suspect UK and mainland EU would be the only real options for not-so-stupid shipping costs.

    I'm going to be upfront and say I'm willing to spend up to £50 + shipping for a good working unit as this is purely hobby related.

    Thanks.

    Re: WTB: Cherokee PSU

    Posted: Thu Feb 08, 2018 3:17 am
    by Irinikus
    Isn’t it possible to recap the blown power supply that you have? Or is the problem not capacitor related?

    Re: WTB: Cherokee PSU

    Posted: Thu Feb 08, 2018 3:36 am
    by JacquesT
    Irinikus wrote:Isn’t it possible to recap the blown power supply that you have? Or is the problem not capacitor related?


    It's not caps related, the power input circuit blew near the relay area. The unit emitted a weird warbling noise from the same area before it went poof! I opened it up and it was well cooked, it's now decorating the 'metal only' chute at our local recycling centre! :)

    Re: WTB: Cherokee PSU

    Posted: Thu Feb 08, 2018 6:36 am
    by Irinikus
    It's a pity you didn't take any photo's of the blown circuitry, as this could be a weak spot in the design, that can maybe be fixed before it fails catastrophically.

    Re: WTB: Cherokee PSU

    Posted: Thu Feb 08, 2018 7:37 am
    by spiroyster
    Pm'd ;)

    Re: WTB: Cherokee PSU

    Posted: Thu Feb 08, 2018 1:06 pm
    by JacquesT
    Irinikus wrote:It's a pity you didn't take any photo's of the blown circuitry, as this could be a weak spot in the design, that can maybe be fixed before it fails catastrophically.


    ;) Have camera, will take photos! There is no way to get a camera in to the area in question though, it's under the heatsink of the row of voltage regulators.

    Trying to get to the component(s) that failed will be a pita! I've indicated the area in question on the images. There were loads of dust balls between the component pins, not sure if these could cause a short?

    (Ignore "Inout side" typo on first speech bubble!)

    Image

    Image

    Image

    I have loads of photos of the Cherokee PSU if anybody wants to see them, took them when cleaning the fan.

    https://flic.kr/s/aHsmcsfGEM

    spiroyster wrote:Pm'd ;)


    Thanks, hope you can find something! :)

    Re: WTB: Cherokee PSU

    Posted: Thu Feb 08, 2018 7:09 pm
    by Irinikus
    Thanks for posting the pics! :D

    I for one haven't seen the inside of one of these units before, so this is rather informative, as it shows that they didn't glue the components together, as you often see in switch-mode power supplies. this makes it easier to service.

    As for the components underneath the heat sink, it will be interesting to see what's under there, as you will probably find that more than one of these units has failed in this way.

    Re: WTB: Cherokee PSU

    Posted: Thu Feb 08, 2018 7:27 pm
    by robespierre
    It appears that there are a string of four TO-220 (or similar) three-leg components on that heatsink. A dentist's mirror would help in seeing what's printed on them.

    Re: WTB: Cherokee PSU FOUND

    Posted: Fri Feb 16, 2018 2:24 pm
    by JacquesT
    Found thank you.