Question about Sony ICF-CD543RM Clock Radio

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Primary winding of ac power xfmr open

What is the secondary voltage of this xfmr? I have a few that might work.

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  • Brian Eicher Apr 14, 2009

    Interesting..huh?

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Posted on Apr 14, 2009

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The limit switch to the left of fan switch is "Nordyne" part #626259. This switch is rated at140 degrees. When the temperature inside firebox exceeds 140 degrees, switch "opens" removing power from the secondary of 24vac xfmr.

The fan switch to the right of the limit switch is "Nordyne" part #626337. This switch closes when firebox temp reaches 115 degrees. Opens at 70 degrees.

At the top to the left of fan is a smaller limit switch, which is a secondary safety switch. The increased temperature within the heat exchanger box activates this switch. It is wired in series with the thermostat wiring.

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A smarter way is look for the source voltage--if the chip failed it got a resistor between it and the FLYBACK which is where the approx 30 volt source comes from for vertical---follow it to the xfmr.--there will be a open resistor in that line.

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Panasonic PT-51hx40b projection TV powers off when I try to turn it on


Not sure if the transformer is bad or something on secondary side is pulling the voltage down--if replacing it cured the issue you did good.

If not try to disconnect at source on secondary side to see if with no load the voltage comes up.

Looking for either the xfmr to be bad or something shorted pulling the voltage it creates down.

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ML 300RTW


First test your ac voltage going into the transformer. Then with the lights disconencted check the voltage at the terminals. (make sure your tester reads 12V DC) If you have voltage now, then you most likly have an open circuit or a short in your lighting wiring, or fixture socket.
http://www.malibulights.com/Docs/Pdf/8100-9300-01.pdf

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Do you get the high voltage coming up? You can check for this by measuring if there's any voltage at DL231 or/and DL221 (diodes off secondary of flyback). If there is voltage momentarily then the hv is trying to come on and the Flyback is likely at fault (excessive highvoltage detected) if not then usually power supply problem is indicated - Start there - tip-use the tuner shield as ground/return

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1 Answer

Makes a high pitch "chirping" sound when I try to turn it on


if its a hi pitched whine it could be the horizontal output xfmr make sure all solder joints around the xfmr are solid and the xfmr mounts are tight it sounds as if your hearing the 15,750 hz. horiz. signal

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Repair for Emerson MW8102SS microwave


What probably happened when the power went out is that you had a power surge or SPIKE as well, either before or after power was lost and then restored.

This sometimes can happen just before the power trips at your substation that feeds your house, or else it can happen when the power comes back on.

There are safeguards that are suppose to be in place to prevent this from happening, but sometimes they fail as well.

If you are in a bad area that has frequent power outages I would suggest adding an appliance surge suppressor to your microwave - similar to those like they use on refrigerators.

If your microwave is a 110VAC unit and somehow 220VAC is crossed circuit wise (as in underground, etc) then the same thing can cause your present day problem as well. Happened to my neighbor once and the same thing happened to their Litton Microwave. They gave it to me free, as they were just going to throw it out anyway.

I was able to open it up and get the part # off the L.V. XMFR and ordered a new one for like $10 direct from the XFMR mfr after getting their factory phone #. Litton wanted $36 for their same identical part. $$$

When this power outage happens like it did to you then you get a surge of current that will overload the primary side of the LOW VOLTAGE Transformer (XMFR) and causes it to go open circuit in the secondary - as in - it makes a break inside the XFMR itself causing the Control Panel to go dead as well. Because this AC XFMR is a step down type that takes 110VAC and drops it down to say maybe 18-24VAC you can see why it wouldn't like 220VAC on the primary side - as then the secondary side would rise up to say 36-48VAC which is way too high for the DC rectified voltages that run the Control Panel logic circuits, etc.

Nothing will work at this point except maybe for the cooking chamber light - maybe? If the Low Voltage XFMR has a fuse in it's circuit that fuse can be blown. If there is no fuse for that circuit then the L.V. XFMR has to be replaced. Usually the XFMR part will cost anywhere from $18 to maybe $35 if you can get one.

If you know someone that is handy with a DVM (digital volt meter) perhaps they can OHM out the primary and secondary side of that L.V. XFMR for you as I firmly believe that is your only problem.

One thing you might check first though is if there is a Circuit Breaker (CB) on the back of the MW unit. If it has one chances are it may have tripped, and by pushing the popped button back in - your problem would be solved hopefully. IF it even has a CB.

Hope the info helps out?

Best regards,

Frank

Mar 03, 2008 | Emerson MW8102SS 1100 Watts Microwave Oven

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