Sewing machine power supply/capacitor blown up

[Simon Smith]

Hi. Hoping someone here may be able to help. My wifes sewing machine went up in smoke the other day. I searched the net for a replacement power module but no luck so I decided to see what went wrong.
A capacitor inside the power module has blown up but unfortunately some of the ID has disappeared so I am unable to fully identify the component part number. Can anyone suggest a suitable replacement or how to determine what would be required?

Hope the photo link works

Thanks.

 

[Robert_fay]

I can't read all the numbers on the folded side. I know the PME271M is a series of caps that you can buy almost any where. https://www.digikey.com/short/jpfmtt is a link to the series from Digikey. I think there are some numbers on the right side of the pic I can not see that may be able to help.

 

[(*steve*)]

Given that you know the series, if you measure the dimensions of the cap you can probably narrow down there possible range of values.

 

[Simon Smith]

Hi Robert, The numbers on the other side are 250v - SH, so probably of no use. Nothing else is visible.
I've trawled the net using the numbers I can see but it seems to come down to a selection with different capacitance values, not knowing this value is my problem. Unfortunately this value seems to be generally marked on the top of the cap which is now missing!

 

[Simon Smith]

The machine is a ELNA club 500 btw.

 

[Robert_fay]

I don't have any information on the machine itself. Only option I have would be to get the measurements as Steve said and look at the series.
Can you get the following Lead spacing. Height off board. LxW

 

[Simon Smith]

Given that you know the series, if you measure the dimensions of the cap you can probably narrow down there possible range of values.

Thanks Steve, Good idea, I hadn't considered that. I'll get measuring.

 

[Alec_t]

The yellow label in the last pic has 'C104' on it, which could relate to a 100nF capacitor. Can you show us the whole label?

 

[Simon Smith]

The yellow label in the last pic has 'C104' on it, which could relate to a 100nF capacitor. Can you show us the whole label?

Hi Alec. I'm fairly certain the 'C104' relates to the component number for assembly, all the caps are numbered c101, c102, c103 etc as are resistors r101,r102 etc.

The photos shows the cap removed from the board and all the label thats left after blowing up!

 

[Simon Smith]

I don't have any information on the machine itself. Only option I have would be to get the measurements as Steve said and look at the series.
Can you get the following Lead spacing. Height off board. LxW

Lead spacing is 15mm, height is 13mm, length 18mm & width 8mm, as best as I can measure

 

[Robert_fay]

So just based off measurements you provided and the series number it would lead me to look at part PME271M568MR30
18.5mm x 7.8mm x 13.5mm
15.2mm lead spacing

 

[Simon Smith]

So just based off measurements you provided and the series number it would lead me to look at part PME271M568MR30
18.5mm x 7.8mm x 13.5mm
15.2mm lead spacing

I was just looking myself on RS components and came up with:
P276QP683M275(1) PME271M568M(1) which appears to be the same as your offering Robert.

I think I will give it a try as I really have nothing to lose, the machine is spare parts junker without a power supply!

I will update as soon as I know the result!

 

[duke37]

If this is a capacitor across the mains, it should run without it but produce radio interference.

 

[WHONOES]

I think the numbering on the capacitor is the old Philips components numbering system. The division was taken over by Rifa a number of years ago but they kept the Philips system as it was very logical. It is possible to determine exactly what the component is and its value from the number.

 

[Simon Smith]

If this is a capacitor across the mains, it should run without it but produce radio interference.

Looking at the circuit board it does run across the mains input. TBH I haven't tried running it without the cap as I wasn't sure if this would be safe & its a pain to reassemble.

 

[Simon Smith]

I think the numbering on the capacitor is the old Philips components numbering system. The division was taken over by Rifa a number of years ago but they kept the Philips system as it was very logical. It is possible to determine exactly what the component is and its value from the number.

I tried searching using the numbers 40/085/56 but nothing sensible comes up unless I use the PME code. As Robert suggested, by using the cap dimensions along with the PME code it narrows it down to one cap.

 

[Alec_t]

It is possible to determine exactly what the component is and its value from the number.

My interpretation of the PME code number is that it's a X2 type 68nF metallised paper cap, 275VAC.

 

[Simon Smith]

Good news, The cap arrived this morning, fitted and everything is working great.
I really cannot thank you all enough for your input, its great to find a forum like this.

 

[Simon Smith]

My interpretation of the PME code number is that it's a X2 type 68nF metallised paper cap, 275VAC.

Exactly what I ordered. Fitted this morning and everything running fine

 

[Alec_t]

Good to hear.