1-4. Cautions when Replacing the Lithium Battery
The lithium battery is installed on the SY-467 board. This lithium battery is used to back up the real-time clock (RTC).
RTC stops operating when the battery life expires. Replace the battery and reset the DATE (M03) of the
MAINTENANCE menu. (Refer to OPERATION MANUAL.)
Part No. Name Usage
1-756-134-1X
Lithium Battery (ML621 (U)) For internal clock
CAUTION
Ensure that the battery is installed with + and – poles connected to the correct terminals. An incorrect
connection may cause an explosion or leakage of fluid.
1-4-1. Replacing Procedure
Preparation
1. Remove the top cover. (Refer to “2-2. Top Cover”.)
2. Remove the optical cable. (Refer to step 1 in “2-4-1. LEMO Connector Assembly”.)
3. Remove the top chassis. (Refer to step 1 in “2-5. Top Chassis/Air Distributor Assembly”.)
4. Remove the SY-467 board. (Refer to steps 1 and 2 in “2-7. SY-467 Board/AT-195 Board”.)
Procedure
1. Replace the lithium battery on the SY-467 board.
Lithium battery
Hooks
Hooks
Lithium battery
Battery holder
SY-467 board
Note
When installing the lithium battery, install it to the orientation shown in the figure.
2. Install the removed parts by reversing the steps of removal.
HDCU3500/HDCU5500
1-10
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