HEIDENHAIN TNC 620 User Manual page 62

3
Cleaning
Use operating gloves to prevent the device from
becoming dirty.
In order to maintain the functionality of the keyboard, use only
cleaners stated to contain anionic or nonionic surfactants.
Do not apply the cleaner directly to the keyboard unit.
Slightly dampen a suitable cleaning cloth with the
cleaner.
Switch the control off before cleaning the keyboard unit.
Never use the following cleaners or cleaning aids, in order
to avoid damage to the keyboard unit:
Aggressive solvents
Abrasives
Compressed air
Steam blasters
The trackball does not require periodic maintenance.
Cleaning is required only if the trackball stops
functioning.
If a trackball is embedded in the keyboard, clean the trackball as
follows:
Switch off the control
Turn the pull-off ring by 100° in counterclockwise direction
Turning the removable pull-off ring moves it upwards out of the
keyboard unit.
Remove the pull-off ring
Take out the ball
Carefully remove sand, chips, or dust from the shell area
Scratches in the shell area may impair the functionality or
prevent proper functioning.
Apply a small amount of an isopropyl alcohol cleaner to a lint-free
and clean cloth
Please observe the information for the cleaner.
Carefully wipe the shell area clean with the cloth until all smears
or stains have been removed
62
Fundamentals | Visual display unit and operating panel
HEIDENHAIN | TNC 620 | User's Manual for Setup, Testing and Running NC Programs | 01/2022