High Voltage Shocker - components blown in new machine

[Douglasbell01]

Re: High Voltage Shocker - components blown in new machine

The fuse on the board (when it originally blew) had darkened glass (scattered metal?).

Since testing again with the step-down voltage convertor (without replacing the MOV), 2x fuses have popped. Clear glass.

[goontron]

Re: High Voltage Shocker - components blown in new machine

check that you got the correct rated fuses if you do it sounds like you might have a half shorted component, its the fuse the board blowing clear correct?

[budm]

Re: High Voltage Shocker - components blown in new machine

Yep, that is the good old trick when look at the glass fuse, if it is blacken inside the fuse, then you have really shorted load. Just like the one shown in the post 1 when MOV blown.

[Douglasbell01]

Re: High Voltage Shocker - components blown in new machine

Thanks. It sounds like there's a half-shorted component in that case, because the new fuse blows clear.

Next step ideas? From earlier posts, it sounds as if I need to work out a way to test the resistance of components around the fuse. So there may well be another 1/2/3/4/5 components to replace.

Are you optimistic of this being reparable? I may be able to buy/borrow testing gear. But don't want to waste anyone's time.

[budm]

Re: High Voltage Shocker - components blown in new machine

You mean the fuse on that power supply board is blowing? Did you do any resistance testing as suggested on post 15? Any pictures of the whole board both sides?

[Douglasbell01]

Re: High Voltage Shocker - components blown in new machine

Yes, the fuse in the photos is the one that blows still (before changing the MOV, but with a step-down convertor in use).

I've not managed to do any resistance testing (but will try to get the gear to do this).

Also, the machine is stored at a friend's house. I'll try to photograph the board (both sides) asap.

[Douglasbell01]

Re: High Voltage Shocker - components blown in new machine

WOW, multimeters are cheap! Just found one (new, free postage) for roughly $5 US on Ebay UK. http://tinyurl.com/ml7vgq9

[momaka]

Re: High Voltage Shocker - components blown in new machine

Wait, so did you take out the blown MOV out yet? If you haven't, you will keep blowing fuses.

[Douglasbell01]

Re: High Voltage Shocker - components blown in new machine

Replaced the MOV and fuse. Machine working again!

Then the step down transformer blew after about an hour's use. Easily replaced. Wrong values.

[bexy2386]

Re: High Voltage Shocker - components blown in new machine

douglasbell01 did you manage to fix your yudu printer? I have just done exactly the same. Any advice? Does it work fine now with a convertor plug now you have replaced the fuse? I have no idea how to go about fixing the fuse!

[Agent24]

Re: High Voltage Shocker - components blown in new machine

WOW, multimeters are cheap! Just found one (new, free postage) for roughly $5 US on Ebay UK. http://tinyurl.com/ml7vgq9

For that price, including shipping, that's not a multimeter, that's garbage, really.

[DjKrish]

Re: High Voltage Shocker - components blown in new machine

When a fuse blows, diodes, power transistor and bridge rectifiers are the first to check followed by other components.