Real Time Clock Problems

Doesn’t Keep Time When Power Off

The first thing to check is the clock’s battery (Figure 20‑3). Measure its voltage relative to ground, as shown; it should be 2.7V or greater.

Figure 20‑3. Location of the clock battery.

The battery (LI-COR part number 442-03791) is a “coin” type, and is held in place in a holder on the corner of the board. It is easily removed, but be sure the instrument is powered off.

“Clock Stopped” Message

Open’s main screen displays the time and date, which should update each second. If the real time clock is not running, the message “Clock Stopped” is displayed instead. If this happens, contact LI-COR.