Carbon dust deposits on PCB/Modules? – WD440P

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  • January 7, 2011 at 11:24 am #60017
    neon_3SP_glow
    Participant

    Hotpoint WD440P – 39154166

    Customer complains that intermittenly the machine will get stuck on the distributing spin section. ie, after rinsing, drum will slowly tumble and never end, not kicking into the higher spin speeds. The machine has done this for hours before the customer switches it off.

    Discovered a lot of carbon dust on the module (mark 4). Has anybody expirenced similar faults caused by the dust? Failing that EMW will have another job!

    Thanks in advance for any response.

    January 7, 2011 at 11:58 am #340436
    nigegt
    Participant

    Re: Carbon dust deposits on PCB/Modules? – WD440P

    Yes, I carry a little nail brush for cleaning the backs of those boards. Have had a few WMA’s lately with drum action problems caused by carbon build up too.

    Nige

    January 7, 2011 at 5:04 pm #340437
    Martin
    Participant

    Re: Carbon dust deposits on PCB/Modules? – WD440P

    neon_3SP_glow wrote:Discovered a lot of carbon dust on the module (mark 4).

    If by clearing it the problem wasn’t cured then, as you say, it’s a job for EMW.

    neon_3SP_glow wrote:Has anybody expirenced similar faults caused by the dust?

    On the PCB side it’s usually not a problem as the surface and surface components attached are lacquered and therefore insulated. But on the other side surface components, especially eeproms, can suffer the dreaded ‘ionisation effects’. 🙁

    January 8, 2011 at 12:13 pm #340438
    neon_3SP_glow
    Participant

    Re: Carbon dust deposits on PCB/Modules? – WD440P

    hey guys, thanks for the advice.

    I re-fitted the PCB after cleaning and asked the customer to report back…. unfortunately it was still faulty… EMW it is!

    Seen the LG PCB’s? They lacquer the whole lot in about 5mm of glue!!!

    January 8, 2011 at 1:16 pm #340439
    odom
    Participant

    Re: Carbon dust deposits on PCB/Modules? – WD440P

    neon_3SP_glow wrote:Seen the LG PCB’s? They lacquer the whole lot in about 5mm of glue!!!

    Soldering iron cuts through it nicely though 🙂

    They really are a pain though – makes inspecting and testing the board very difficult, which is what I suspect LG want, so you just buy new boards from them. Thankfully see very few LGs around here.

    January 19, 2011 at 9:56 am #340440
    neon_3SP_glow
    Participant

    Re: Carbon dust deposits on PCB/Modules? – WD440P

    After fitting the re-con board, customer now complains drying cyle is not heating, although original problem has not re-ocurred.
    Drying element was O.C. and so was the one shot stat! Grrrr!

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