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need a wiring diagram for a sharp m/wave, model R7E53 bm, s/no. 20914436. can anyone oblige me with this info. thanks.
TELL..Re: M/wave wiring diagram req’d ??.please.
can anybody give me a site on the internet to get this wiring diagram, getting desperate now, thanks
TELL..Re: M/wave wiring diagram req’d ??.please.
don`t have a wiring diagram but what problem are u having
maybe able to help??Isn’t in the back of the owners manual, or inside the casing perchance? Samsung always put the schematic in the book, but it’s years since I’ve seen a Sharp manual…
Re: M/wave wiring diagram req’d ??.please.
diagram not in the casing etc, no book from cust, what happened is the
8 amp safety blown fuse blown, tested the components, trans, cap, diode, etc, and found magnetron filament shorting to earth, goosed, fitted new mag, test m/c saftey fuse blown again. went back into components testing, found the relay blk, and brn wires run back through to the main control panel and are giving a readind down to earth,????.
there is an earth lead on the main p.c.b which runs to a door monitor (microswitch) and down to earth. i’m not getting any other reading to earth off anthing else.??
TELL..
P.S. apprieciate the response, Davecas & dpm.If there’s only one wire to the microswitch and the other sode goes to ground, obviously the switch is on the (isolated) LV/ SELV control circuit. Sounds like a breakdown on the pcb then?
Re: M/wave wiring diagram req’d ??.please.
did fuse blow only when programme selected and start button pushed?
or did it blow as soon as plugged in?
if blew prior to being switched on fault usually lies in microswitches
if occurred when powered up then is usually on high voltage side, quite often if the magnetron goes down to earth it take out the diode on the capacitor usually the one accross the capacitor terminals but occassianally the one from capacitor to case.
As a rule if I am changing a Maggy on a Sharp I would change the diodes as well.
I personally have never known a board go down to earth.
Hope this helpsRe: M/wave wiring diagram req’d ??.please.
magnetron filament has gone down to earth orig fault, new mag in, diode ok, bleed resistor ok, cap ok, and my reading on the transformer windings are ok.
the m/wave will power up to setting to cook, and fuse ok, wont blow.
but set on to cook ie… press start, it pops the fuse.. thats why i need a diagram for the pcb. as this earth lead off it has a circuit through to earth?????.
TELL..Re: M/wave wiring diagram req’d ??.please.
I’ve never had a PCB go to earth…..
However as I don’t know this appliance, you could disconnect the live and nuetral to the primary side of the HV transformer and retest, this eliminates the HV side if the fuse blows.
From there, the next step is checking the operation of the door switches, the best bet being you have one shorted together.
I have no diagram but if memory serves, both live and nuetral from the board are switched by the door micro switches and both can be isolated by unplugging one plug from the PCB.
KevinRe: M/wave wiring diagram req’d ??.please.
will go through the wiring and components again, and isolate the LV side at trans, to check it out.
TELL..Re: M/wave wiring diagram req’d ??.please.
does sound like a door switch. if one switch is faulty and allows microwave to run on when door is about to be opend anouther microswitch shorts from ground to live to make shure the fuse blows.
normaly 2 or 3 switches on the doors but check them all. normaly only one dies.Re: M/wave wiring diagram req’d ??.please.
As I recall, one switch (a changeover) switches live, but also has a lead to a shunt resistor which is hooked to Nuetral.
If the live is not removed from this switch by another switch opening 1st, as the door opens then it shorts live to nuetral through the shunt, hence one fuse blowing.Hope that helps
KevinRe: M/wave wiring diagram req’d ??.please.
on the job now checking through, fingers crossed. thanks gentlemen. will keep you informed.
TELL..
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