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2-3.
Replacing Lithium Battery
2-3-1.
Note on Replacement of Lithium Battery
A lithium battery is mounted on the SY-449 board to back up the real time clock (RTC).
If this unit is not energized, the backup period is about two years. When the RTC is reset without using this unit for long
time, charge the lithium battery by energizing this unit all day long.
When the backup period is shortened even if the lithium battery is charged, the lithium battery must be replaced.
• Replacement part: Lithium secondary battery (ML621 (U))
• Part number:
1-756-134-16
!
Note on Replacement of Lithium Battery
CAUTION
When replacing the lithium battery, ensure that the battery is installed with "+" and "-" poles connected to
the correct terminals. Improper connection may cause an explosion or leakage of fluid, resulting in injury
or damage to surrounding properties.
2-3-2.
Replacing Lithium Battery
1.
Remove the SY-449 board. (Refer to
2.
Remove the Lithium secondary battery (ML621 (U)) from the four hooks of the battery holder, and replace it.
SY-449 board
Note
Be sure to use an insulating stick to remove the Lithium secondary battery (ML621 (U)).
3.
Install the removed parts by reversing the steps of removal.
4.
The date and time in the internal clock to be set. (For setting method, refer to Operation Manual.)
HDC-P43
"4-15. SY-449
Board".)
Hooks
Lithium secondary battery
Hooks
2-3
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