Hi @steviecripps,
Did you mean the fuse (brown component with the arrow on the board, pointing towards it - best seen in 3rd image down that you posted above) blows when the machine is connected to the power supply?
If so did you replace it with a T3.15A 250V¹ fuse. (supplier example only)
If this isn't the fuse you meant, did you test the fuse mentioned above for continuity using a DMM's (digital multimeter) Ohmmeter function to see if it is OK?
If OK it would test 0.00 Ohms - a short circuit, if faulty it would test OL or infinite Ohms - an open circuit.
Fuses can blow without showing any signs that they have done so, especially those that are encapsulated in a solid case and not a glass see through tube where you can see the fuse wire itself.
¹ If the fuse is blown, ensure that any replacement fuse has exactly the same rating, especially the "T" rating. The "T" indicates that it is a timed (aka slow blow) fuse and not a standard fast acting fuse e.g. T3.15A 250V and not 3.15A 250V.
Slow blow fuses are used because they can withstand the high inrush currents that occur when power is first connected to the board. These currents which last for <8-10mS (milliseconds) can be several times the value of the normal maximum operating current that is used by the machine. If a standard fast acting fuse having the same voltage/current rating was used in its place it would blow immediately the power was connected, whereas the slow blow fuse would hold until the current subsided..
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@steviecripps I converted this from a comment to its own question. that way you most likely get a bit more help. you know we love pictures on here. Post some of your circuit board. Let's see what you got going on here. Adding images to an existing question
crwdns2934271:0crwdnd2934271:0 oldturkey03 crwdne2934271:0
Hey @jayeff Ok, so the resistor is a red herring. I discovered that my cheap multimeter doesn't measure low ohms so I believe that it was ok. I checked the power inputs and seemed fine. So I added a new fuse then tested without the motor and switch circuit attached. The fuse didn't pop! So I added the button circuitry back, it didn't pop. So I soldered the motor back online and again it didn't pop! I reassembled the unit and the power light appears to suggest there is power going in but when I hit the button to start grinding the motor doesn't spin up and the power / function light flashes. It could be a motor failure I guess or there is some sort of pressure switch which is on the top underneath the casing which I could look at also...
crwdns2934271:0crwdnd2934271:0 Stevie Cripps crwdne2934271:0
I have the same problem with the T3.15A 250V fuse blowing when plugging in the machine. Replacing the MOV surge suppressor and disconnecting the switch circuit didn’t help. Did you manage to figure out if the motor was the problem on your unit?
crwdns2934271:0crwdnd2934271:0 Ccc crwdne2934271:0
@ccc32322 The motor was my next focus, so I disconnected it from the board, replaced the T3.15A 250V fuse then powered up also disconnecting the switch connections and the fuse didn't blow. I then reattached the switch connector and the light came on. I then put the motor back in line and the fuse didn't blow the light came on - but the motor didn't function when the button was pushed. After the second push the light around the button would gently pulse but there was no action from the motor at all. Do let me know if you make any progress with your unit. At the moment it look like I'll be stripping mine for spares!
crwdns2934271:0crwdnd2934271:0 Stevie Cripps crwdne2934271:0