Garmin G1000 Nxi System Maintenance Manual page 147

Capacity Test
The PS-835 Emergency Power Supply must have completed a full charge prior to
any discharge testing. This test is performed with the battery removed from the
aircraft.
A. Press and hold TEST SWITCH (Figure 4-5, Item 4) and observe the OUTPUT
VOLTAGE MONITOR LED's.
1. If the 24VDC OUTPUT VOLTAGE MONITOR LED comes on, proceed with
Discharge Test procedure.
2. If OUTPUT VOLTAGE MONITOR LED's do not come on, check fuses at bracket
next to battery and replace if blown. Perform Cell Isolation Test if no fuses are
blown.
B. Discharge Test (Load Resistor)
1. Prepare for test by first constructing an X-Y graph similar to the one shown
below. If possible, use pre-printed graph paper to create a record of the
discharge period along the X-axis and voltage readings along the Y-axis.
2. Position all INDIVIDUAL CELL DIP SWITCHES (Figure 4-5, Item 5) to the ON
position. If the INDIVIDUAL CELL MONITOR LED DS12 is the only LED not
illuminated, proceed to the Cell Isolation Test.
G1000 NXi System Maintenance Manual
King Air 300 Series
190-00716-N1
NOTE
Page 134
Revision 1