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One for the electronics expert

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Oddjob:

--- Quote from: Orcade-Ian on June 04, 2023, 05:06:54 PM ---Ken,
It appears worse than just fuses - there appears to be some serious trauma around that diode (D6?) in the second pic and the solder seems to have melted around the diode mount hole and that blue bodied resistor looks suspect too. What is that splodge between diodes D7 and D9 in the first pic? 
Those components are probably part of the bridge rectifier in the power supply.

Ian

--- End quote ---

I see what you're getting at Ian. It could be that the fuse blew after severely overheating and that sprayed the soldered joint where it was mounted on the PCB across both D6 and the blue diode. I may have to remove that board and see if the back of it shows any signs of damage.

I presume these fuses are extremely low ampage ones? around 1a or something?

No mention in the literature about running it longer than the 30 minutes the timer goes to.

If I an source some fuses it may be worth the cost just to see if it works or not, if not no harm done, if it does, free Ultrasonic.

Maybe some of these. https://www.amazon.co.uk/sourcingmap-Glass-Cartridge-Axial-3-6x10mm/dp/B008LTJH1K/ref=asc_df_B008LTJH1K/?tag=googshopuk-21&linkCode=df0&hvadid=570384070781&hvpos=&hvnetw=g&hvrand=11749060324832004749&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=1006886&hvtargid=pla-856719816406&psc=1

Laverda Dave:
My cleaner heats the water independently of the vib motor. The instructions specifically state do not use the vib motor for more than 30 minutes.

McCabe-Thiele (Ted):
Looks like they have dropped the Vevor ones and the price has shot up for the alternatives 6 L now £252 plus shipping.

Only concession is mine is stored in a heated room when not being used - it will probably fail any time soon it's 11 months old.

https://www.allendale-ultrasonics.co.uk/ultrasonic-cleaners/benchtop-ultrasonic-cleaners/6-litre-ultrasonic-cleaner

Toko_Jo:
US cleaners are switching several hundreds of volts at very high frequency into a highly
 capacitive load and are notorious for going pop...even the Ultrawave pro units do it. The usual failure items are power transistors or MOSfets that drive the US transducers. They are the 3 legged devices on heatsinks. Best bet is to use a multimeter on  diode test function to check every diode and betweel all legs of 3 legged output devices on heatsinks. The usual failure mode is short circuit, which will show 0v on the  diode test. If you experience this then best to desolder the device and re-check out of circuit just in case another component such as a coil etc is affecting the reading.

Laverdaroo:
Just to piss on yer chips a bit, I bought a knock off Chinese one at 7 litres, the timer runs to an hour and the water gets  hot up to 60 degrees in about 15 mins but l always warm it first on the stove as the gas is cheaper. I often put it on for a run, inspect and bob it on again for another hour. Had it three years and never had an issue. At 65 quid I wasn’t bothered if it went pop after using it for what I wanted as it saved so much time but it just keeps going.

For once, it appears I lucked out.

Unusual for me


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