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Drill stopped working

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Hi guys I have a drill brand name 'casals' that stopped working. When I opened it found a type of diode with switch that was burned. Would like to know what this diode was so I can change it.
Thanks.
 

alec_t

Well-Known Member
Most Helpful Member
Drill model?
Any decipherable markings on the failed component?
Any good sharp close-up pics?
 
That most likely is a Universal (brushed) motor, I have never seen a diode on any of these before, be interesting to know the function of the diode in this case, are you sure it is in fact a diode?
Max.
Don't know exactly if is a diode cause it's broken in two but looks like a diode.
The thing I don't know what type cause with burnt no codes are visible
 

MaxHeadRoom78

Well-Known Member
Some devices that appear to be diodes are TVS Transient Voltage Suppression diodes, they are in fact two back to back.
Max.
 

MaxHeadRoom78

Well-Known Member
If this is a variable speed drill the Universal type use a 'Dimmer' style control for this, there must be a little more electonics in there?
Max.
 
If this is a variable speed drill the Universal type use a 'Dimmer' style control for this, there must be a little more electonics in there?
Max.
Hi Max no this has no variable speed just two speeds hi low
Do you know of a part no for that TVS that you mentioned please?
Thanks
 

alec_t

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Perhaps the 'diode' is indeed a diode, either bypassed or providing half-wave rectification for a universal motor according to the speed selector position.
 

kubeek

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If it is a real cheapo it could be using the diode to run the motor on half-wave rectified mains voltage.
 

Inquisitive

Super Moderator
How about a photo. It would help.
 

spec

Well-Known Member
Most Helpful Member
Perhaps the 'diode' is indeed a diode, either bypassed or providing half-wave rectification for a universal motor according to the speed selector position.
If it is a real cheapo it could be using the diode to run the motor on half-wave rectified mains voltage.
My misuse's hair dryer goes from full wave rectification to half wave for the fan motor to go from max speed to half speed.

spec
 

spec

Well-Known Member
Most Helpful Member
You seem to misuse those the same way I do ;)
Yes, drying paint on car/electronic equipment, drying PCBs, drying adhesives, heating components to check for faults... :D

It is a rolls Royce, salon model too, but she never complains.

spec
 

ChrisP58

Well-Known Member
Sounds to me like a rectifier diode that's used to halve the voltage for low speed. If it now runs only on high speed, then it's failed short.

I would replace it with the highest current diode that you can make fit in the space.

If your mains voltage is 120, use at least a 200 volt diode. If 240, use at least a 400 volt one. But I would probably choose a 800 or 1000V part as it's not going to be much more money and will be more immune to the transients coming off the motor brushes.
 
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