Fisher & Paykel GW503 Smart Drive transistors?

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  • July 5, 2007 at 3:26 am #28741
    pgaastra
    Participant

    Hi, anyone able to tell me what sort of transistors drive the IRF840 FETS on the MC230 motor controller board? They are little SOT 3 packages.

    I have been overhauling a machine which had totally seized bearings. I have replaced the bearings. The two IRF840’s have blown but some other components have gone too.

    One of the errors that came up before they blew this time was
    error 40 bowl disengage. I don’t understand this. To me the Smart drive doesn’t have a clutch.

    December 2, 2007 at 3:59 am #219863
    rftech
    Participant

    Re: Fisher & Paykel GW503 Smart Drive transistors?

    Hi mate..
    IRF840 is a N Mosfet 500V 8A 125W.
    My little book of tricks tells me a MTP 8N50, 2SK555, 2SK894, 2SK1496.
    Any of the above MAY work.. But you will HAVE to look up their datasheets and verify this against the IRF840’s data.

    Cheers.. 😯

    OH>>> Don’t forget to check the diodes that are between the S-G pins… These protect the transistors and probably will have taken a bashing too!..

    December 2, 2007 at 12:12 pm #219864
    Penguin45
    Participant

    Re: Fisher & Paykel GW503 Smart Drive transistors?

    Drum is driven by splined connector to shaft. For wash, the drum should float off the splines, ie up the shaft, to allow the motor to operate the paddle but not the drum. If it doesn’t, it effectively overloads the motor and you get a fault code.

    Penguin45.

    December 2, 2007 at 7:25 pm #219865
    pgaastra
    Participant

    Re: Fisher & Paykel GW503 Smart Drive transistors?

    rftech wrote:Hi mate..
    IRF840 is a N Mosfet 500V 8A 125W.
    My little book of tricks tells me a MTP 8N50, 2SK555, 2SK894, 2SK1496.
    Any of the above MAY work.. But you will HAVE to look up their datasheets and verify this against the IRF840’s data.

    Cheers.. 😯

    OH>>> Don’t forget to check the diodes that are between the S-G pins… These protect the transistors and probably will have taken a bashing too!..

    Thanks for that. My question was asking for the transistors which drive the IRF840’s

    Thanks

    December 2, 2007 at 7:56 pm #219866
    pgaastra
    Participant

    Re: Fisher & Paykel GW503 Smart Drive transistors?

    Penguin45 wrote:Drum is driven by splined connector to shaft. For wash, the drum should float off the splines, ie up the shaft, to allow the motor to operate the paddle but not the drum. If it doesn’t, it effectively overloads the motor and you get a fault code.

    Penguin45.

    That might explain something, it’s been a while since I was working on the machine. I replaced the seal and bearings. Maybe I messed something up when I reassembled it. It didn’t sound right when it started to wash.

    Since then I have aquired a couple more dud washing machines so I may be able to salvage one.

    January 28, 2008 at 1:16 am #219867
    rftech
    Participant

    Re: Fisher & Paykel GW503 Smart Drive transistors?

    pgaastra wrote:

    rftech wrote:
    Hi mate..
    IRF840 is a N Mosfet 500V 8A 125W.
    My little book of tricks tells me a MTP 8N50, 2SK555, 2SK894, 2SK1496.
    Any of the above MAY work.. But you will HAVE to look up their datasheets and verify this against the IRF840’s data.

    Cheers.. 😯

    OH>>> Don’t forget to check the diodes that are between the S-G pins… These protect the transistors and probably will have taken a bashing too!..

    Thanks for that. My question was asking for the transistors which drive the IRF840’s

    Thanks

    HAHA.. Sorry! I’ve been operating on very little sleep for the last few months..

    IR2111S Half Bridge Driver, Fixed 650ns Deadtime in a 8-lead SOIC package

    That’s the one – But in my opinion it’s very unlikely to be the problem.. more likely one of the IRF840.. It is recommended to replace all in one go but that can be expensive.. 6xAU$5 (approx AU$30) for all of them..

    You would be better off replacing the board with another one if anything more than the IRF840’s have gone…


    As always – POWER OFF AND PULL OUT PLUG FIRST BEFORE ATTEMPTING ANY WORK!

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