5. If the AFAT battery pack or the plastic case containing
batteries is in the PTC-860’s battery compartment, remove
it. Refer to the “Removing the batteries” section on page 44
for the correct procedure.
6. The backup battery switch is located in a small opening just
inside the battery compartment and to the right, w hen the
PTC is facedown (see Figure 1). Insert the tip of a pen or
pencil into the opening and apply direct pres s u r e to push
down the switch. Make sure the switch is pressed down
completely.
7. Insert the AFAT battery pack or the plastic case containing
batteries into the PTC-860’s battery compartment. Refer to
the “Installing new batteries” section on page 45 for the
correct procedure.
8. Replace the battery door and tighten the two screws.
Note: If the backup battery switch has not been turned on, a
warning message displays when you turn on the PTC.
©Charging the battery pack
Charge your PTC-860’s AFAT nickel-cadmium battery pack, if
used, before you use the unit for the first time and whenever
the battery pack becomes weak. The PT C - 8 60’s low-battery
light glows when the battery pack is low.
Note: If you are using alkaline batteries in your PTC-860,
replace them whenever the low-battery light glows.
19