Needed: Litton Microwave Service Manual
Neil Watkinson
I'm not sure I have the right news group for this request, so if not could
someone point me in the right direction.
I own a Microwave Oven that has broken down, and I've been told that not only
can the part not be found, but neither can a service manual to describe it
sufficiently to find a replacement.
The Microwave is a Litton, Generation II, Multi-Wave, model number AU2485.A
I beleive the manufacturer was NEC (this could be wrong) and it was purchased
about 6 years ago.
If anyone has, knows of, a service manual for this beastie so that I can get
the specs on the low voltage transformer could they e-mail me on
Many many thanks in advance.
Neil......
Neil Watkinson (:-) Stone Microsystems (Aust) Pty. Ltd. | ( /~ )
Phone : +61 2 818 3211, Fax : +61 2 818 3070 | \ /\ /
Address : 20-22 Fred Street | \ (OO) /
Lilyfield, N.S.W., 2040, Australia ,,,^..^,,, | I'd rather be skiing.
--
Neil Watkinson (:-) Stone Microsystems (Aust) Pty. Ltd. | ( /~ )
Phone : +61 2 818 3211, Fax : +61 2 818 3070 | \ /\ /
Address : 20-22 Fred Street | \ (OO) /
A LERMA
Watkinson) writes:
What you have been told is basically horse hockey.
I've never used a 'service' manual for a microwave.
the schematics are on this inside of the case.
If not a fuse its a safety switch , if not safety switch then its
the magnetron
if not a magnetron its the transformer. - all items basically
generic.
Did the guy LOOK at it?
Look at the circuit card (Back of it) with control crap onit.
often a solder joint breaks - then burns off the copper trace...
Filip M Gieszczykiewicz
>>[my microwave oven died - what now]
>What you have been told is basically horse hockey.
>I've never used a 'service' manual for a microwave.
>the schematics are on this inside of the case.
>If not a fuse its a safety switch , if not safety switch then its the
>magnetron if not a magnetron its the transformer. - all items basically
>generic. Did the guy LOOK at it?
>Look at the circuit card (Back of it) with control crap onit.
>often a solder joint breaks - then burns off the copper trace...
Greetings. If not that, check the relay - 15A assigned to switching
12A inductive loads is not good. Replace with 20A relay. Also,
be very careful when removing safety-switches. They are aligned
so mark the position before removing the assembly - otherwise
have a few boxes of fuses handy. [sigh]
Also, some newer sets have realized that relays are getting more
expensive than 20A triacs so you're bound to see some of those. They
are pretty reliable. It helps to clean the connectors - oxidation
is not good (heating).
I've also seen wires twist and "blow" much like the fuse. It's
usually around the safety-switch. Seems that some microswitces
have high resistance, they heat, the connector heats -> oxidizes
faster, connections deteriorate, more heating, "PUFF"....
And don't forget the thermal switches! They can open and stay
that way and make you climb up the wall. Check them if none of the
above is the problem.
Microwaves are suprisingly simple... especially to repair. I should
confess that I don't really understand how the magnetron works - in
this case, taking one apart didn't help (well, I did get 2 nice
magnets for the fridge ;-)
Take care.
--
+-->Filip "I'll buy a vowel" Gieszczykiewicz | E-mail: fi...@alpha.med.pitt.edu
| http://alpha.med.pitt.edu:9000 for a peek at new sci.electronics FAQ V2.0
| ftp to bode.ee.ualberta.ca and get file /pub/cookbook/contents. Neat stuff.
| Making money with CS and spending it on EE, robotics, windsurfing, & dreams.
John Lundgren
from the cathode to the body of the magnetron. It's like blowing over
the open end of a bottle, it will oscillate at the frequency determined
by the dimensions of the cavities. There's a tap and a waveguide to take
out the power. The magnets cause the electrons to spiral as they go
outward.
--
John C. Edwards
>What you have been told is basically horse hockey.
>I've never used a 'service' manual for a microwave.
>the schematics are on this inside of the case.
>If not a fuse its a safety switch , if not safety switch then its
>the magnetron
>if not a magnetron its the transformer. - all items basically
>generic.
What component(s) would go out if metal is microwaved?
The big, apparently ungrounded metal racks in some ovens contrast with those
that complain mightily or bite the dust when a sheet of foil is hidden under the
warm-food-to-be. How can this be?
Illuminate me.
John Edwards
Baylor College of Medicine
David DiCarlo
jlun...@news.kn.PacBell.COM writes:
>the open end of a bottle, it will oscillate at the frequency determined
>by the dimensions of the cavities. There's a tap and a waveguide to
take
Can the oscillator cavity be changed to change the frequency of
oscillation?
2.45 GHz is adjacent to the 2.3 to 2.45 GHz amateur frequency assignment.
Cheap source of a 700 watt transmitter for amateur tv...
Dave DiCarlo
r14...@waccvm.sps.mot.com
martin johnson
>In article <2t2feu$5...@search01.news.aol.com>, ale...@aol.com (A LERMA) says:
>>What you have been told is basically horse hockey.
>>I've never used a 'service' manual for a microwave.
>>the schematics are on this inside of the case.
>>If not a fuse its a safety switch , if not safety switch then its
>>the magnetron
>>if not a magnetron its the transformer. - all items basically
>>generic.
>What component(s) would go out if metal is microwaved?
The 4000 volt diode is a common part to go bad.
>The big, apparently ungrounded metal racks in some ovens contrast with those
>that complain mightily or bite the dust when a sheet of foil is hidden under the
>warm-food-to-be. How can this be?
>Illuminate me.
>John Edwards
>Baylor College of Medicine
--
______________________________________________
| martin johnson mar...@uiuc.edu |
| "mind your business", on first US coin |
|____________________________________________|
Clifton T. Sharp
> Also, some newer sets have realized that relays are getting more
> expensive than 20A triacs so you're bound to see some of those. They
Even the real old ones. I have a Magic Chef high-end oven that dates back
to 1977, and when it went out (in 1993!) it was the triac that was bad. No
relays, thank you. :-S
--
Optimists say, "The glass is half full."
Cliff Sharp Pessimists say, "It's half empty."
WA9PDM We realists say, "Before I decide,
cli...@indep1.chi.il.us tell me what's in the glass."