Section 5 Maintenance Internal Battery
3BSE 027 941 R301 121
To exchange the internal battery:
1. Using a blade screwdriver, release the captive screw from the PM8xx and
remove the right-hand cover.
2. Identify and remove the internal battery.
3. Insert a serviceable battery and check that battery polarity and orientation are
correct.
4. When power is re-established, ensure that the B(attery) LED is illuminated
Figure 33. Right-hand Cover Removal – here shown with PM860
Cover
Captive screw
Internal
battery
holder
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