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| Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Panasonic Microwave
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 |
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#2
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You can not make any determinations until you install the correct fuse.
JR Seafarer wrote: 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 -- -------------------------------------------------------------- Home Page: http://www.seanet.com/~jasonrnorth |
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#3
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On Mon, 14 Mar 2005 14:01:33 -0800, JR North
wrote: You can not make any determinations until you install the correct fuse. JR Seafarer wrote: 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 -- -------------------------------------------------------------- Home Page: http://www.seanet.com/~jasonrnorth 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 |
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#7
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On 16 Mar 2005 13:30:28 -0500, Sam Goldwasser
wrote: (Seafarer) writes: On Mon, 14 Mar 2005 15:54:26 GMT, (Seafarer) wrote: I should know this but I'm not getting it at the moment,out of touch 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. snip thanks Sam see the previous text,it's bloody annoying.Regards |
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#8
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(Seafarer) writes:
snip thanks Sam see the previous text,it's bloody annoying.Regards 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. |
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#9
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"Sam Goldwasser" bravely wrote to "All" (17 Mar 05 15:24:42)
--- on the heady topic of " Panasonic Microwave" SG From: Sam Goldwasser SG Xref: aeinews sci.electronics.repair:43295 SG (Seafarer) writes: snip thanks Sam see the previous text,it's bloody annoying.Regards 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?!? |
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#10
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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 "Seafarer" wrote in message ... On Mon, 14 Mar 2005 15:54:26 GMT, (Seafarer) wrote: 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 [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 |
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On Sun, 20 Mar 2005 07:07:29 +0000 (UTC), "Paul Brooks"
wrote: 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 [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. |
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#12
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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 "Seafarer" wrote in message ... On Sun, 20 Mar 2005 07:07:29 +0000 (UTC), "Paul Brooks" wrote: 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 [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. |
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On Mon, 21 Mar 2005 14:34:17 +0000 (UTC), "Paul"
wrote: 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 "Seafarer" wrote in message Thanks alot Paul,I'll await reply to the letter then get on to it.Appreciate the help.Regards |
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"Paul" wrote in message ... 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)... 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 |
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Caveat caveat, Sharp is owned by Matsu****a as well as Panasonic. Might you
consider that, while you are dismayed, Matsu****a 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 Matsu****a replacement parts? "Seafarer" wrote in message ... On Mon, 14 Mar 2005 15:54:26 GMT, (Seafarer) wrote: 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 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. |
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On Tue, 29 Mar 2005 07:26:01 GMT, "Steven" wrote:
Caveat caveat, Sharp is owned by Matsu****a as well as Panasonic. Might you consider that, while you are dismayed, Matsu****a 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 Matsu****a replacement parts? [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. |
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Steven wrote:
Caveat caveat, Sharp is owned by Matsu****a as well as Panasonic. Might you consider that, while you are dismayed, Matsu****a 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 Matsu****a replacement parts? Since when is Sharp owned by Matsu****a? It didn't appear that way only a few years ago. --- Met vriendelijke groet, Maarten Bakker. |
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#19
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