Hach-Lange DR 3900 User Manual - Manual (Page 123)

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Expanded programs
6.8.6 Service menu
Use of the service menu requires a service code. This menu is
reserved exclusively for servicing tasks.
6.8.7 Service time
In order to make sure a regular inspection is performed, an
automatic memory reference for the service times can be
entered. After switching the instrument on, this memory reference
will be activated and indicated at the appropriate time.
1. Press Service Time in the "System Check" menu.
2. Activate the On checkbox.
3. Press Last service.
4. Enter the date of the last service.
5. Press OK to confirm the selection.
6. Activate the options field under Next service.
7. Select a time interval for the next service.
8. Press OK to confirm the selection.
When the next service is due the report "Next service due!!" is
displayed when the instrument is switched on.
9. Press OK to return to the Main Menu.
Contact the manufacturer to schedule the next service date.
6.8.8 Lamps operating time
The "Lamps operating time" provides information on the
switch-on cycles of the lamps.