Audio Desk Systeme - Vinyl Cleaner – Repair of Water Pump Failure


After the water pump of my beloved Vinyl Cleaner from Audio Desk Systeme stopped working I searched the web and found that I’m not the only one with this problem. But nowhere did I find a blog or post that would describe a repair procedure – other than to mail the machine back to Germany for an expensive repair.

If your machine is still under warranty you should of course send it back for warranty repair. But if your machine is out of warranty (like mine) and your only option is to spend lots of money to get it fixed, you might want to consider repairing it yourself.

The way the vinyl cleaner is designed does not allow any maintenance or replacement of any component located inside the machine without destroying something. The whole machine is glued together! Something I have not seen before to this extent – especially not on a high dollar item like this. Only the components in the upper compartment where the white cleaning rollers are located can be accessed thru the opening in the top cover.

To get started you need to separate the bottom PVC plate from the bottom of the tank. Both plates are glued together. I used a flat pry-bar to carefully separate the bottom plate without breaking it. Shining a flash light thru the water sight glass you can see the blue water pump thru the drain hole of the tank.

To get to the water pump you need to remove the bottom of the tank (or parts of it) which is glued to the recessed side walls.

Use a permanent marker to draw straight lines on the tank bottom – 5 mm inbound from the side walls. The PVC side walls are 5 mm thick. Try to cut slightly inside that line to not cut into the recessed side walls. I used a Dremel with a cut-off wheel.

Once the bottom of the tank is removed you have access to the water pump and all other internal components. To disconnect the pump wires from the main board you need to remove the front panel with on/off switch. Follow the pump cable from the tank and disconnect both wires from the terminal.

In my case it turned out that the pump actually did not fail - it was simply seized up. Once I rotated the little impeller by hand and hooked it up to the 24 V DC power supply in the sink it started to pump fine again.

In case you find your pump to be dead and need a replacement look for “Barwig Tauchpumpe Typ 3 24 V DC”. Price is around 18 EUR (appr. 20 USD) at amazon.de or conrad.com. Unfortunately I was not able to find a supplier who would ship to the U.S.. You may need to be creative – or plan your next vacation in Germany ...

If you use aquarium grade silicone adhesive instead of strong PVC adhesive to put it all together you will be able to undo everything easier in case you need to access the inside of the machine again. 

Feel free to email me if you have questions or need pictures.

Decibell

decibell
In reviewing the specifications of the pumps being recommended, I’ve noted something that no one has mentioned and may be the cause of failures. These pumps are specified to have a maximum duty cycle of either 15 or 30mins with a like cooling period after. Now this is NOT mentioned in any of the Audio Desk documentation and if you are doing a batch of records where you do a 5min wash cycle and a 1 min dry cycle, this will obvious cause long term issues if you don’t pause for a time after every third record.

One could make the argument that a continuous flow pump should have been spec’d, but given it wasn’t, this tip may allow others to get more life out of their machines. 
For those interested here is a link to the Comet Elegant 24v pump data sheet that has been referenced: https://www.comet-pumpen.de/fileadmin/pdf/pumpen_datenblaetter/24v/Datenblatt_ELEGANT_24V_1305.79.00...

Note that it states “continuous operation possible”; HOWEVER, its rated lifetime at 24v is only up to 500 hours. 
@mscardina
It takes appr. 10 seconds to pump the water from the tank to the upper compartment. The pump turns off after that and the wash cycle begins. It takes 180.000 pump/wash cycles to use up 500 hours of the pump's lifetime! I don't think pump wear is the issue here. Most likely contamination of the pump's journal bearing with gunk from dirty records.
@decibell, thanks for the response and pictures. I don't believe the pump stops during the wash cycle for 3 reasons. First, the filter in the rear doesn't have a purpose if the water is not continuously circulating. Second, there is no cover that blocks the water from flowing back through the pump when the rollers come together if the pump were to stop. Finally, there is no water level control as the overall quantity decreases if it is not continuously circulating via the filter trough.

I have also examined my motor carefully and while there was "gunk" at the bottom of the tank, the impeller was very clean which make sense as water is flowing through it and it is sealed very well. Assuming a brushless design, the typical failure would be from overheating as my impeller freely turns.
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