What Value is this Ceramic Resistor?

[adamq]

Hi all,

I'm confused by a power resistor. Here is the picture.

I see it's 5W but then the 0-Ohm-01J confuses me. Is this a 0.01 ohm resistor?

The resistors im familiar with have decimal ratings, followed by either Ohm or R.

I'm replacing it because it is burned out (other pic)

 

[davenn]

Is this a 0.01 ohm resistor?

yes

I'm replacing it because it is burned out (other pic)

probably not

it most likely is just be heat from that other resistor beside it
that is confirmed by the way the white resistor is marked

 

[adamq]

Thanks.

I'm replacing with a 0.05 ohm 10w resistor as that's the smallest I could source locally.

This is part of a DC motor controller board which has given up the ghost.

Hoping for the best.

 

[adamq]

Hmm just noticed the other part of your reply.

The other resistor is ohming out correctly.

The rest of the board is completely clean.

It's the only obvious sign of failure I can see... I'll try the replacement and see if it doesn't fix it.

 

[adamq]

Update, you're right. That wasn't the problem.

This DC motor controller just stopped working one day. Can't seem to figure out why. It's off a lathe.

 

[davenn]

The rest of the board is completely clean.

show a pic of the whole board ... both sides

 

[adamq]

Don't mind the crummy solder job... Not a pro by any means.

The heat sinks are connected to three D8020L rectifiers and two BT151 thyristors.

I noticed the heatsink of one of the D8020L is electrified/not insulated. Not sure why one and not the others, but it is.

 

[adamq]

A few more angles if it helps.

The two lower heatsinks are both d8020l, as is the top left.

The two top right are both BT151's

 

[adamq]

Unbelievable. Months of not being able to use this lathe and taking it apart here and there, all because of a safety switch that I didn't know existed.

The two blue wires (K3 and K4) run into the head stock of the lathe which made me wonder why. Turns out there's a switch on the Chuck guard so that if the workpiece or chuck key hits the guard the whole lathe shuts down. Good feature, and it's supposed to auto reset (spring loaded), but it jammed open.

I jiggled the guard and sure enough it's fine.

So for all you with a mini lathe (sieg, harbor freight, metalworker, busy bee, little machine shop, central machinery, or any other brands) who end up on this thread because the lathe Motor won't turn, check the Chuck guard switch, not the control board.