Heath Consultants Heath Data Recorder (HDR) - Manual (Page 40)

40
Back-up Battery Replacement Procedure
This procedure describes how to replace the lithium back-up battery BT1 (HPN 77R65-8001) and the profiler back-up coin
cell battery BT2 (HPN 77R65-8002). It is recommended to replace both batteries at the same time. If configured, the
instrument will alert the user of a low lithium back-up battery on the LCD and via being connected to the instrument either
by direct RS-232 or modem.
Replacing the lithium back-up battery: Warning: Make sure the main battery voltage is at least 1.2 V
dc
!
1.
Remove the metal shield from the PCB. Take care not to lose the hardware.
2. Locate BT1 in the lower middle part of the PCB. Refer to the photos below:
3.
Lightly push down on the center retainer clip and use a small, thin bladed screwdriver to gently pry the latches on
the retainer clip free from the holder.
4. Remove the lithium battery and retainer clip from the holder.
5.
Remove the retainer clip from the lithium battery.
6. Observe the correct polarity of the lithium battery in the holder and insert the new lithium battery into the holder.