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Okki Nokki repair

Records need cleaning, be it new or second-hand. For years I did this by hand, letting the records dry on the air. A few months ago an opportunity came to buy an Okki Nokki second hand with almost no hours. This added another dimension to cleaning records since difference between air-dried and vacuum dried records is audible. So a big bummer when suddenly the Okki Nokki decided not to start anymore: Only a click when switched on, nothing else.

Can we fix it?
Since only a click was audible at switch on, something could be wrong with the liquid sensor. The manual states that residual liquid has to be drained regularly from the reservoir to prevent damage at an interval of 20 to 30 records. Otherwise warranty will be nullified. Each drain I did was about half a cup full, far less than the mentioned 350ml. So what coud be wrong? I decided to open it up and see for myself despite voiding warranty.
Searching te web for how-to's or pictures was not successful for the latest model so found out myself and decided to share..
Okki Nokki repair
Latest model Okki Nokki (June 2016)

Okki Nokki repair
Okki Nokki repair
Referred to manual entries..

Let's open it..
This took me a while to figure out, so these are my steps by trial and error:

  1. Put the Okki Nokki on it's side with the suction arm opening at the lower side.
  2. At the bottom remove the two philips screws and remove the four rubber feet (using a torx screwdriver).
  3. Remove the plastic ventilation grill. The hole willl provide for a grip to pull the bottom out of the enclosure (watch it: the hole may have sharp edges which can harm your fingers).
  4. Carefully remove the bottom. This is not so easy since it is a snug fit to prevent air leakage when operating the vacuum pump.
  5. Now you can do your stuff inside..
  6. Close it again following the steps in reverse order
When the bottom is removed, the resorvoir, motors and relais are visible. The liquid sensor is located in the reservoir and was heavily polluted with dirt. Apparently that much dirt comes from cleaning vinyl. Strange that the sensor gets inoperable so easy by dirt. Or maybe it is the cleaning fluid being used (Okki Nokki in my case) that evaporates leaving only the dirt behind. Might be something to do with my cleaning routine interval? Anyway much dirt was collected in and around the sensor what caused activation of the relais. After cleaning it worked again, so nice. I disconnected the sensor from the relais to see if the Okki Nokki would become operational, and it did. This is how I use it now to prevent pollution shutting the Okki Nokki down again. I now have to be very aware that fluid drainage has to be done regularly because excess water will harm the vacuum pump.
Below lots of pictures..

Okki Nokki repair
On its side, unscrew philips screws and remove feet..

Okki Nokki repair
The removed bottom plate. Not glued but a snug fit. Do not use a screwdriver or so as leverage as this will cause air leakage..

Okki Nokki repair
Overview of the innards..

Okki Nokki repair
The floatless relais and vacuum pump..

Okki Nokki repair
Detailed view of the vacuum pump.

Okki Nokki repair
Switches at the front..

Okki Nokki repair
Relais indicating that drainage is needed with no water in the reservoir..

Okki Nokki repair
The reservoir, a plastic box, with drain tube and sensor (inside)..

Okki Nokki repair
The built up dirt below the sensor..

Okki Nokki repair
Reservoir removed. Be aware of the four clips that secure the lid.

Okki Nokki repair
The polluted sensor..

Okki Nokki repair
Residual dirt in the reservoir..

Okki Nokki repair
Cleaning the sensor..

Okki Nokki repair
Clean with a spray bottle, like for plants..

Okki Nokki repair
The result..

Okki Nokki repair
Sensor has sideholes as well for level sensing..

Okki Nokki repair
Reservoir put back again..

Okki Nokki repair
Relais indicating water supply, so no active sensor (disconnected sensor)