What is this black item

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Essential protection is provided by including a diode in the output stage.
Flyback diode - Wikipedia, the free encyclopedia
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MOSFET as a Switch
Inductance
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If there is no paralell diode to motor, then this is 'this' diode.
 
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After checking and giving board good clean, there is what looks like a zener symbol where our problem unit should go (sorry didn't give board good clean earlier).
Also on back of board there is the name "Alcon" followed by ECU 101 and ISS1, is this any help.
The circuit is my own work
 

Alcon is a famous Ophthalmic Pharmaceutical company. Their well known product is Contact Lenses (Alcon Ciba Vision). They also manufacture surgery equipment for Ophthalmology. The number you showed is the reference for the company product.
 

Thank you guys for your help, i'll take all info you've given and decide what item to try.
 

City fan said:
Thank you guys for your help, i'll take all info you've given and decide what item to try.
Click to expand...

Dont wory its zener diode 1,4W I think 8,5V try it give about 15V and see zener voltage. ;-)
 
Thanks:lol:

Did find site for Alcon electrics, now just capacitor manu.
 

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