Isgus Perfect 2040 Operating Manual page 134

If such a date has been set in your unit, the PERFECT displays the following
message:
Hint!
The functions of the unit are not affected by the message
"SERVICE REQUIRED".
4-102 Getting Started
= Confirm setting.
Recorder changes to year.
= Set desired year.
Value range: 00 - 99
Note: By keeping this key
pressed the next value is
scrolled.
= Confirm the selection, setting
routine is completed.
The recorder changes to
operating display and shows
the current date and time.
Chapter 4