Tip & How-To about Norelco 3405 LC Electric Shaver

I accidentally ran my 3405 LC on 220V ! What can I try to fix it?

Most likely R3 (470 ohm) and R4 (430 ohm) are burned and need to be replaced, these are both 1/4 watt resistors. Probably good to check the diodes for a dead short, but these resistors most likely opened first. Hope this helps, Good luck!

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tr51 gets hot


Do you have a "swing kit" or a "swing diode" installed?
This could also be called an NPC ("Negative Peak Clipping") Modification. There should be a 1/2 watt 100 ohm resistor attached on the unbanded end of the diode. If it is a "Kit", It will not have a 100 ohm resistor and can cause TR51 to overheat during long transmissions.
You may want to remove the diode or kit if you have one in there and, as a better choice, change R238 (near VR13) to a 220K ohm resistor.
That will give you Killer loud audio with a stock mic. You probably won't be able to use a pre-amp (Power) mic after changing R238 to a 220k ohm.Back down the carrier power to 3 watts and watch the modulation get violent!

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The resistor is open? Look for the resistor to be in series with a diode and check to see if the diode is shorted. The resistor and diode should be part of a power supply circuit. Check to see that it is not driving a short. If there is a short, it is probably the sound chip or maybe the vertical. You can't just replace the resistor without actually finding and correcting the cause or you'll just fry another resistor.

Hope you find it.

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if r 11 is bad you should really check the bearing on the tub you will probably find it to be bad or going bad causing the moter to pull more amps causing r 11 to burn out.

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Thanks for the update. I'll need to look through my records for similar problems. Stay tuned...
Dan

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