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Panasonic Microwave

Discussion in 'Electronic Repair' started by Seafarer, Mar 14, 2005.

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  1. Seafarer

    Seafarer Guest

    I should know this but I'm not getting it at the moment,out of touch
    since retirement I guess.It's my machine and,unbeknown to me my wife
    decided to degrease the microwave[it had been unplugged for a week and
    I was golfing} On return I swiched it on and it fired up,trying a
    glass of water made it fail completely,no display nothing.I tested the
    250v 10A fuse in it read ok in and out of circuit.On a hunch it may be
    breaking down under load I replaced it with a 250v 6.3A fuse[I had no
    10A since I sold my stock]Up came the display.I tested the grill it
    worked fine so it's only the Micro.Jusat to track it I tried the micro
    with the 6.3A fuse and watched it flash[well it would]Thought I'd ask
    whilst I await the 10A fuses in case I've missed something.Can't be
    the TX as it works with grill.If not fuse guess it may be a hv
    diode.Cheers
     
  2. JR North

    JR North Guest

    You can not make any determinations until you install the correct fuse.
    JR
     
  3. Seafarer

    Seafarer Guest

    thanks I got that but I wanted to see the 6.3A fuse blow as a guide to
    a splashmark.Power is arriving to the low power TX but the 10A fuse
    shows,and tests fine until micro is started.I have ordered extra fuses
    but I still think the fuse would only fail in the HV circuit if the
    diode failed.Trouble is i live in the sticks and it will take a while
    to get parts.I'll go through the hv circuit.thanks again
     
  4. Seafarer

    Seafarer Guest

    Just as an upgrade,replaced fuse,grill,convection works,start
    microwave and power is cut and fuse fails and also the wall socket
    fuse blows tripping the power cutouts.
    Stripped most down,diode checks ok,no 4v coming to filement wires and
    mag fil leads and mag check is ok.
    I did notice well hidden three IC componants close to diodes but I
    could get to them today.I'll stip her down fully tomorrow and hope one
    of these is shorted,if not its on to the cappie.Regards
     
  5. HV capacitor, magnetron failing at HV, HV transformer short, etc.

    Will it run with HV transformer disconnected from HV cap and magnetron?

    --- sam | Sci.Electronics.Repair FAQ Mirror: http://repairfaq.ece.drexel.edu/
    Repair | Main Table of Contents: http://repairfaq.ece.drexel.edu/REPAIR/
    +Lasers | Sam's Laser FAQ: http://repairfaq.ece.drexel.edu/sam/lasersam.htm
    | Mirror Sites: http://repairfaq.ece.drexel.edu/REPAIR/F_mirror.html

    Note: These links are hopefully temporary until we can sort out the excessive
    traffic on Repairfaq.org.

    Important: Anything sent to the email address in the message header above is
    ignored unless my full name is included in the subject line. Or, you can
    contact me via the Feedback Form in the FAQs.
     
  6. Seafarer

    Seafarer Guest

    [snip]
    Just to wind this up,I stripped it down and found a transistor on the
    inverter board that showed b/e s/c.This would be the problem in the hv
    stage.Phoned up Panasonic and they said it was a common problem and as
    I noticed the Transistor had no case markings I asked the type and for
    a couple of replacements on my credit card.Panasonic said they would
    not issue the transistor but would only issue a new inverter board at
    160 pound plus vat! so there we have it,a microwave that costs 300
    pounds and needs a transistor worth a few pounds is now useless.Take
    my tip don't buy Panasonic.Regards
     
  7. Seafarer

    Seafarer Guest

    snip thanks Sam see the previous text,it's bloody annoying.Regards
     
  8. Yeah, you could probably come up with a replacement based on the requirements
    but I absolutely agree that companies are not exactly eager to help.

    --- sam | Sci.Electronics.Repair FAQ Mirror: http://repairfaq.ece.drexel.edu/
    Repair | Main Table of Contents: http://repairfaq.ece.drexel.edu/REPAIR/
    +Lasers | Sam's Laser FAQ: http://repairfaq.ece.drexel.edu/sam/lasersam.htm
    | Mirror Sites: http://repairfaq.ece.drexel.edu/REPAIR/F_mirror.html

    Note: These links are hopefully temporary until we can sort out the excessive
    traffic on Repairfaq.org.

    Important: Anything sent to the email address in the message header above is
    ignored unless my full name is included in the subject line. Or, you can
    contact me via the Feedback Form in the FAQs.
     
  9. Asimov

    Asimov Guest

    "Sam Goldwasser" bravely wrote to "All" (17 Mar 05 15:24:42)
    --- on the heady topic of "Re: Panasonic Microwave"

    SG> From: Sam Goldwasser <>
    SG> Xref: aeinews sci.electronics.repair:43295

    SG> (Seafarer) writes:

    SG> Yeah, you could probably come up with a replacement based on the
    SG> requirements but I absolutely agree that companies are not exactly
    SG> eager to help.


    Most times they are eager to discourage it.

    A*s*i*m*o*v

    .... You mean 15" sparks are SUPPOSED to come out of this thing?!?
     
  10. Paul Brooks

    Paul Brooks Guest

    If you are a Panasonic Service Agent and the unit is no more than 2 years
    old it is possible to get an exchange unit where you only pay for the labour
    charge. You need to prove DOP with a Sales Invoice. Try contacting Customer
    Services on 08705 357357.
    They should not be supplying this part to a non Service Agent due to the
    dangers involved and the Product Liability Law so I am rather amazed you got
    a price which is about right.
    We are finding a lot of the Inverter Power Supplies do fail but they
    normally do it within the first 2 years. It can be caused by the way due to
    the Magnetron going short to earth so that would need measuring first.
    Paul
     
  11. Seafarer

    Seafarer Guest

    [snip] Thanks for that,it's just over two years and I have sent a
    letter of complaint to them.I have repaired more microwaves than I
    care to think about including a service contract with Beefeater.Since
    retirement and buying the Pan.the bulb went and Panasonic would not
    replace it as I am not a Pan.Service agent.I sent my card up and they
    were happy to replace it knowing I was an engineer.I understand their
    caution my complanit is, it should not need a inverter board replacing
    for the sake of Q701 it makes no sense to small repairers.The mag has
    tested good at least the filiments show less than 1 ohm and there is
    no continuity between fil and case.I'll await my letter reply before
    ringing them although last time they put me it touch with an engineer
    who did guarantee work for them,that's where I got the price from.They
    don't really want to know.Appreciate the help and if you come across
    any spare Q701 parts I'd be happy to buy from you.Or a generic
    device.Thanks for the help.
     
  12. Paul

    Paul Guest

    Ok, if you have meggered the magnetro and there are no shorts then it is the
    'self-destruct' inverter. From memory I think the transistor is available
    but it is about £15 (penalties of living in the good old UK). Cust.Svcs
    should bend a fovourable ear for foc inverter replacement part but might not
    let you do it (unless you provide so many bits of paper you'll land up with
    bureaucratic madness. best of luck - they usually respond fairly quickly.
    Regards
    Paul
     
  13. Seafarer

    Seafarer Guest

    Thanks alot Paul,I'll await reply to the letter then get on to
    it.Appreciate the help.Regards
     
  14. NSM

    NSM Guest

    I have a 1200W combo microwave/convection unit (120 Volt). On mine, the MOV
    shoots smoke and sparks out of the top, and the smaller of the two
    transistors on the heat sink (right hand side) has a crack right through the
    body for no reason I can think of. Any idea of part identification?

    NM
     
  15. Seafarer

    Seafarer Guest

    Just as an update to this,Panasonic replied saying although they could
    see I was a well qualfied microwave engineer they would not send me a
    part as the whole inverter board will have to be replaced by a Pan
    Service centre at enormous cost.
    I have now bought a Sharp combi,half the price,twice as good and with
    no inverter board.Just the plain old fashioned hv.circuit.I can fix
    this with my eyes shut if necessary.Keep away from inverter boarded
    microwaves like Panasonic.It's a racket.
     
  16. Steven

    Steven Guest

    Caveat caveat, Sharp is owned by Matsushita as well as Panasonic. Might you
    consider that, while you are dismayed, Matsushita wishes to maintain it's
    normally well respected name by limiting repairs to these repair centers?
    Perhaps a better understanding can be had if you travel to an independent
    servicer who has a relationship with a supplier for Matsushita replacement
    parts?

     
  17. Seafarer

    Seafarer Guest

    [snip] As stated I am a well respected repairer with several trade
    accounts still,even after semi-retirement.My workshop is fully EEC
    approved and has been inspected by Sony amongst other before awarding
    work from them.As stated I won't spend 180 pounds on a board that a
    fifteen pound transistor has s/c. As stated I bought the Sharp that
    does the same in fact it is better as it uses the top and bottom grill
    for the oven thereby making the machine less bulky.The Sharp[new]was
    far less than the price of an inverter board.Says it all really no
    matter who owns what.Regards.
     
  18. Guest

    Since when is Sharp owned by Matsushita? It didn't appear that way only
    a few years ago.
     

  19. Ignore any posts from "Steven", "Progressive Bingo", and "Place
    bullseye here" They are all a troll who hangs around on
    who doesn't know anything about
    electronics but always has a useless opinion, or a factoid that is only
    valid in "Skippy World".
     
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