Durst Omega 2 Operating Instructions Manual page 72

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Encoder ruler could be scratched!
Reduced functionality of the printer
Do not touch the encoder ruler with hard objects.
Clean encoder ruler with the specified cleaning cloths only.
1. Move the print carriage to the left.
2. Switch off printer.
3. Saturate a fresh cleaning cloth of the type specified with isopropyl alcohol.
Wipe off dirt particles horizontally!
Scratching of large areas of the encoder ruler
Wipe encoder ruler vertically only.
1
Fig. 50 Wiping encoder ruler in vertical direction
4. Carefully wipe encoder ruler (1) with the cleaning cloth in the vertical
direction.
5. Move print carriage to the right manually.
6. Clean the rest of the encoder ruler in the same way.
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Omega 2