Perforation Spark Detector

[Kootni]

Work in a plastic bag manufacturing company. Perforated spark detector which counts bags has gone kaput. I think it’s the inductor which generates 10kv volt through bag perforation which then sends the signal back to the counter is faulty.

Can’t find replacement board. New ones too expensive for company to afford.

Any ideas where can I get this part of the board? Will help greatly. Picture attached.

 

[buzzlightyear]

find out who made it and get a replacement board. then having to source parts .

 

[The Ghost]

That looks like a Line output transformer. Used to mess about with those from the back of the old CRT screens. Should be able to get one somewhere I imagine.

 

[Kootni]

That’s the trouble can’t even get the board. It’s an old machine. So just need this part and hopefully board should work. Just need to know where to get it from?

 

[buzzlightyear]

TRY rs component's .

 

[Kootni]

Nope not the high voltage one. Need something of similar type. Any other ideas please?

 

[StephenRowley]

any manufactures detail, circuit diagrams ect?

 

[telectrix]

LOOK HERE. MIGHT BE SOMETHING YOU CAN MODIFY:
big flyback transformer | eBay - https://www.ebay.co.uk/sch/i.html?_nkw=big+flyback+transformer&clk_rvr_id=1585900149756&gclid=CjwKCAjwmufZBRBJEiwAPJ3LplUpPnpvY3XT1QYtMVICy8FGZgL1oPdPkXXccexBMV-v3eUJi4xd8hoC_4kQAvD_BwE&geo_id=32251&MT_ID=10&cmpgn=794025009&crlp=267296384309_&keyword=big+flyback+transformer&rlsatarget=kwd-143973377533&abcId=1048846&treatment_id=7&poi=&adpos=1o1&device=c&crdt=0&ul_noapp=true

 

[Kootni]

ok will try. Ta.

trouble is without any drawings etc its so hard to workout the input voltages.

 

[xmetal]

Check for dry joints too, especially on the LOPT pins.

 

[Lucien Nunes]

I can't see how it is driven but check the power transistor and its driver transistor, any electrolytics and fusible resistors in that area and primary tuning capacitors. Anything that disrupts the drive waveform can push the output transistor into excessive dissipation and kill it. I can't tell what type of EHT rectification is in there if any; take care if it is diode-split, it might hold a charge for hours after switch-off.

It might be the same part that is used in a large photocopier, printer or other application for which spares are still available. You might have some luck trawling parts catalogues for any other devices that use EHT.