PCB componant identification

[Mark(IOM)]

Hello all,

I went to a Hotpoint WT540/1P that was not working. When I looked at the PCB, I saw 2 componants had blown. I would like to have a go at fixing the PCB, as I think it would be an iteresting exercise. Dont try, you dont learn eh… However, I am unable to identify the two componants I need to get. I have attached a photo of the identical pieces. I need one of the black ones and one of the yellow ones. There is no writing on the black ones that I can see, but on the yellow one there is like a number. It is either U or V 07 2750 7K and I cant make out the last number of letter.
Can anyone assist with the identification please.. ❓ and indeed any tips comments or warnings..!!

Thanks a lot….

[Martin]

PCB componant identification

Don’t fuff about with it Mark, you’ll be on a loser. Simply ship it to EMW and they will send you a working replacement. The logic being that when components on these PCB’s fail it then needs reconfiguring…..Smartcard stuff, smart thinking Batman! 😉

[Allsorts]

Re: PCB componant identification

The Triacs are Z0607 MA
Z0607 MA

And the yellow componant is a K275 variable resistor

George

[RocketMan]

Re: PCB componant identification

The Variable resister is here:
http://www.ebay.co.uk/itm/150612065605? … 1423.l2649

I’ve got some if would like one. Can have it in the post monday if you want.

[Mark(IOM)]

Re: PCB componant identification

Thanks for your information and advice people, just what I wanted.. 😀 … I have to say though, I did not think about the possibility of having to reconfigure the machine after any such repairs as stated by Martin..!! :eeek:
The customer has writen this machine off, so I was going to use the opportunity as a project, as I have not tried it before, and see if I can resurect it so to speak. But if after having replaced the parts, I have to reconfigure the machine after, that is more expense, so whats the point… Has anyone done this before, who knows the answer… or what is the consensus of opinion, that I WILL have to reconfigure after replacement, or that I MIGHT have to..? I would be interested in your comments.

Thanks people.

[Allsorts]

Re: PCB componant identification

I do these sorts of repairs on a regular basis… I would say that the success rate is about 70{e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d} .. but I only attempt the repairs on boards that do not require reprogramming, else they are reprogrammable without the need for additional devices. Though I must say, I find that there are few that would require reprogramming when this sort of repair is effected.

The trouble I find is having the enthusiasm to do the repair.. it is tedious and time-consuming.

George

[leavemetogetonwithit]

Re: PCB componant identification

I had it from a Hotpoint trained engineer a couple of years ago that the eeproms don’t lose their programme easily. I’d have a go if I were you but follow the tracks & wiring back to see what caused the blow out before you replace the components, otherwise they’ll blow again. I’ve never seen one of the varistors blown up. Are you sure it’s not just smoke from the adjacent triac?
Mike.

[RocketMan]

Re: PCB componant identification

Had one a little while back. The triac and variresistor were very close together and the triac burnt a hole in the resistor. Hence I had the supply of them. Cause was a water leak onto drain pump.

[Mark(IOM)]

Re: PCB componant identification

Yes, it is definately the fact that they have blown…. when I took the board out and inspected it, both the triac and the resistor had blown off the board..! they were lying in the plastic case that surrounds the board.!… I think it is the door lock that caused the problem….

[Author]

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