Panasonic Microwave

[Seafarer]

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

 

[JR North]

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

 

[Seafarer]

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

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

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

 

[Seafarer]

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 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

 

[Sam Goldwasser]

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 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

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/
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Important: Anything sent to the email address in the message header above is
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contact me via the Feedback Form in the FAQs.

 

[Seafarer]

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

 

[Seafarer]

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

 

[Sam Goldwasser]

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.

 

[Asimov]

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

SG> From: Sam Goldwasser <[email protected]>
SG> Xref: aeinews sci.electronics.repair:43295

SG> [email protected] (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?!?

 

[Paul Brooks]

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

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

 

[Seafarer]

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.

 

[Paul]

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

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.

 

[Seafarer]

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" <[email protected]> wrote in message

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

 

[NSM]

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

 

[Seafarer]

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.

 

[Steven]

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?

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.

 

[Seafarer]

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?

[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.

 

[[email protected]]

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?

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

 

[Michael A. Terrell]

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

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".