Olympus DP21 Instructions Manual page 10

Battery Life
The DP21's control box incorporates a lithium ion coin battery (CR2032) for backing up the calendar function. The service
life of the battery is 1 to 6 years (it is widely variable because the battery power consumption is reduced during operation
connecting the AC adapter to the control box). The camera can be used even after the battery life has expired, but the
calendar is reset every time the AC adapter is unplugged.
For the battery replacement, contact Olympus.
Control Box Fan
The control box has a ventilation fan. Be careful not to block the ventilation opening. To ensure sufficient ventilation, install
the control box at a distance of 10 cm or more from an obstacle such as a wall.
Blocking the ventilation opening will result in malfunction or damage. Additional care is also required against penetration
of a foreign object through the ventilation opening because this may result in the fan damage. The rotation speed of the
control box fan varies depending on the system internal temperature. As a result, the fan noise may increase in the
following cases but this is not malfunction.
· When the ambient temperature is high in summer, etc.
· When the system temperature is high after long hours of use, etc.
· About 10 seconds after startup.
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