I suspect your the second person to look inside !

Some one else has had it  apart and not reassembled it correctly

John

Edited By john swift 1 on 27/07/2018 12:03:18

Have you informed trading standards – This is probably just one assembly operator who made a dozen wrong before the supervisor noticed but didn't bother to recall the earlier units as he would have got a rollicking for not training the operator properly.

>ouch<

I sincerely hope you paid attention to the 'admonition'. I'd suggest calling Miss Li to complain, but you might expire before you got to the end of the phone number.

I note it has 'CE' in roman script, not a proper CE mark…

It can only be the curve in the board that let it function for a while.

Neil

Thanks for the story and photos, Clive

Products are cheap … Life is cheap

That's the world we are making for ourselves.

MichaelG.

.

[sorry … feeling more cynical than ever, in this weather]

Edited By Michael Gilligan on 27/07/2018 16:10:21

I have been a fan of cheap goods from Ebay and BangGood but some recent experience have made me wonder…

I bought one of the cheap blue demagentisers with the little red button. It really works but I left it under a notebook (heavy enough to activate the red button) for 5 minutes. It melted.

I bought a thermostatially controlled soldering iron which heats to 450C in 40 seconds… and left it on for 8 hours. It melted.

Luckily the melted plastic in these products has a very pungent smell.

I'm not completely put off but I would strongly advise that these bargains are only operated under supervision.

I shall stir the pot!

This was obviously assembled by one of those chaps who believe elf and safety have gone mad. Reckoned it was smart to save time and effort by reversing the pillars. He's down the pub this very moment telling his mates what fools the designers are for not spotting such an obvious trick. Of course he knows nothing about electricity…

When I rebuilt my Hardinge, the original Variac that fed the carriage feed motor, via a rectifier, was burned out (the motor was missing as well ). I replaced the motor, the Variac and also the original selenium rectifiers with modern silicon bridge rectifiers. The new, correctly sized Variac didn't last very long, probably because the current in the original had been limited by the original rectifiers.

Anyhow:- I got a Chinee PWM DC motor controller and wired it in. It worked perfectly for a while, then let all its magic smoke out. Turns out that one of the PCB tracks ran right to the edge of the board and was close enough to eventually ground out on the case. The bad design could have been worked around with a plastic shield or a bigger case.

I bought another one and opened it up, expecting to need to insert a shield if the PCB was of the same design. Low and behold, this one already had a bit of insulating tape stuck to the case in just the right place!

Under rated components, quarter Watt instead of half watt resistor insures a repair department.

The trick is getting It to fail just after 12months, then you can buy a new one or have it repaired ?

Hmm! think the moral here is buy from a known domestic supplier for electrical tools at least you would expect that supplier to ensure the appliance conforms to UK / CE standards. Very cheap if it won't kill you ??

I have to admit I was tempted by the offerings on the web but decided to buy from Machine -DRO instead because of the above rational. We had some Ultrasonic cleaners purchased probably some 12/15 years back from a German supplier, at the time they were price prohibitive in the UK and we saw these at an exhibition in Nurnberg at a very acceptable price, one failed which they fixed it without any problem and they have been in continuous use — several days a week ever since, Recently 2 of the 3 have failed hence our replacement with new ones.

Looked inside and way beyond my understanding of things electrical, possibly not a great deal wrong but no idea how to figure what so closed the box and acquired new ones.

Reading Clive's findings I reckon it was the right decision ! What price is life worth ?

John

Reviving an old thread. My Ultrasonic cleaner has died. It powers on okay, heats up okay, appears to start on the timer and switches off again after appropriate time but I do not get the ZiZiZi noise it used to emit. No bubbles or cleaning.

I came across this thread whilst searching for repairing said item. Took the bottom of to check for problems and can see no issues. Checked all 6 fuses are okay, can see no melted or blown bits, all wires connected and good. It is model with 4 transducers.

See picture below of board.

Any ideas on what to look at, check next, or do I just scrap it and buy another.

Colin