Identifying a fried component.

I’m trying to replace the Fed component in the photos contained within
the below linked ZIP file [1] can anyone identify it?
http://www.homeurl.co.uk/fried_component.zip
it’s the one with the scorch marks around it, between the fuse the large
capacitor and the nondescript black box.

Thank you.

[1] I do apologise to the hard of bandwidth, it’s a very dull, 3.8Mb zip
file containing 4 jpgs of a printer power supply that is not working
because some clever dick plugged it into a 220 supply when what it
really wanted was a 110 volt one.

--
Bob
Currently borrowing a black and red Yamaha XJ750 with fuel injection
Present: Honda XL125RF (FS)
Past: Honda CG125
bob at homeurl tomato dot co dot uk
remove the red fruit if you’d like to email me.

 

Probably a varistor or other similar spike-suppression component, which has
gamely tried to shunt the entire mains supply, and failed in the attempt. If
you are lucky, it blew the fuse (if not the one on the PCB, then the one in
the plug) before any harm was done to the PSU itself. However, I wouldn't
bank on it.

Good luck

Rick

 

The Z1 next to it would normally indicate a zener diode (common in voltage
regulation circuits) but my guess is that metal oxide varistor (MOV) has
been used instead of a zener - a Zinc Oxide Varistor is a voltage
dependent, nonlinear device that has an electrical behavior similar to back
to back zener. When exposed to high voltage transients the varistor
impedance changes many orders of magnitude from a near open circuit to a
highly conductive level, thus clamping the transient voltage to safe level -
unfortunately NOT enough in your case! See here for details
http://www.angliac.com/NewBookPDF/Suppressors/537_540.pdf Your local TV
repair shop may be able to identify the value of the required part and
replace it - otherwise, look for a non-working printer that you can
cannibalise.

Good luck

Tony

 

Thank you, that all makes sense. The problem is as it’s wired across
live and neutral wouldn’t the system work despite the fact it’s blown?

--
Bob
Currently borrowing a black and red Yamaha XJ750 with fuel injection
Present: Honda XL125RF (FS)
Past: Honda CG125
bob at homeurl tomato dot co dot uk
remove the red fruit if you’d like to email me.

 

No fuse in the plug (US you see) but the one in the photo is a
replacement for the very fried one that was in there.

I'm of to buy a new one for about £30

thanks

--
Bob
Currently borrowing a black and red Yamaha XJ750 with fuel injection
Present: Honda XL125RF (FS)
Past: Honda CG125
bob at homeurl tomato dot co dot uk
remove the red fruit if you’d like to email me.

 

Bad form but I don’t care.

Brother have sold me a new power supply for the Princely sum of 350 Hong
Kong Dollars, [1] they were a bit worried about me electrocuting myself
but I did an evil fart in their office so they decided they didn’t mind
if I did; and now the printing machine is working like a dream.

[1] about 26 quid

--
Bob
Currently borrowing a black and red Yamaha XJ750 with fuel injection
Present: Honda XL125RF (FS)
Past: Honda CG125
bob at homeurl tomato dot co dot uk
remove the red fruit if you’d like to email me.