2Service
164 Keysight 53210A/53220A/53230A Assembly Level Service Guide
Checking the battery and battery charger
The Option 300 Internal DC Battery is a Lithium-Ion battery that, when fully
charged, provides +12 VDC voltage to the motherboard for normal operation.
When fully charged, the internal DC battery can power the counter for
approximately 3 hours with external AC power removed.
Battery operation
When AC power is applied to the counter, the +15 VDC from the counter’s
standard AC power supply is routed through the battery connector cable and back
to the motherboard, where several switching power supplies are used to provide
the other DC circuit voltages needed by the counter measurement circuits (see
Table 2-6 above).
When AC voltage is disconnected or lost from the counter, the battery (if turned
ON) applies its own approximately +10 VDC to +12 VDC to the motherboard. This
voltage is sufficient for the switching supplies to continue operation.
Preliminary steps
1 Remove the instrument cover as follows:
2 Remove the AC power cord from the counter and disconnect any signal or
interface cables present.
3 To remove the counter handle, rotate the handle to the vertical (90 degree)
position and pull outward on the two side arms.
4 Using a T20 TORX screwdriver, loosen the two TORX screws securing the rear
panel bezel.
5 Slide the outside cover of the counter to the rear and remove the cover.
Before proceeding, follow all the ESD steps as outlined in “Do this first” on
page 183 of this service guide.
Refer as necessary to the illustrations in the section “To Remove the Cover and
Rear Bezel” on page 185 of this service guide.
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