DMTA-20043-01EN [U8778624], Rev. B, May 201348 Chapter 44. Make sure that the battery compartment door is closed correctly.5. To restore the instrument’s original finish, clean the casing with a soft cloth.6. To remove persistent stains, use a damp cloth with a mild, soapy solution. Do notuse abrasive products or powerful solvents, which could damage the finish.7. Once the connector protectors are removed, make sure the connectors are drybefore connecting anything to them. If they are wet, dry them with a soft, drycloth, or let them air dry.4.2.2 Screen and Screen Protector CleaningNever use abrasive products or powerful solvents to clean the OmniScan SX touchscreen and screen protector. Clean the touch screen and screen protector using adamp cloth moistened with a standard, evaporating glass cleaner. If necessary,remove any paper-towel residue with a soft-bristle brush.4.3 Replacing the Touch-Screen ProtectorThis section explains how to replace the touch-screen protector.To replace the touch-screen protector1. Remove any dust or dirt on the touch screen (dust and dirt cause bubbles toappear on the protective film). See section 4.2.2 on page 48.2. Simply remove the label marked No. 1, and peel away the protective film on theback.Avoid touching the back of the screen protector after the protective film on the back ispeeled away. Doing so will leave a trace of your finger prints.3. Align the protector into the correct position on the screen, and slowly install thescreen protector.4. Remove the label marked No. 2, and peel away the film on the front. Providedthat there is no dust trapped underneath, all small bubbles will dissipate within48 hours.