FRITSCH PULVERISETTE 23 - Manual (Page 29)

9 Repairs
DANGER!
Mains voltage!
– Before beginning with repair work, unplug the mains
plug and protect the device against being unintention-
ally switched back on.
– Indicate repair work with warning signs.
– Repair work may only be performed by specialised per-
sonnel.
– Put safety equipment back into operation after mainte-
nance work.
9.1 Checklist for troubleshooting
Fault description Cause Remedy
No display No mains connection, main switch "Off". Plug in mains plug. Switch on main switch.
Mill reduces speed Mechanical overload Press STOP button
When the piston gets too hot it expands and
becomes too stiff.
Reduce the load. Allow it to cool down.
Mill stops running Switched off due to thermal overload of the
drive.
Allow the device to cool down.
Drive was blocked Clear the jam in the device.
Speed sensor is defective Call customer service.
Grinding stock escapes Clamping device loose Tighten clamping device.
Seal ring defective or not inserted properly. Insert the seal properly or replace it.
Burr formation on the stainless grinding
bowls.
Remove the burr with a scraper or fine
emery paper.
Sealing surfaces are soiled. Cleaning the sealing surfaces. The best
cleaning method is to use standard fleece.
Centre ring not inserted or soiled. (Only for
ZrO
2
)
Insert the centre ring properly or clean it.
Repairs
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