BASEWEST
Operating & Maintenance Manual
Model TS-420 Test Set
Page 7 of 10
25-60-41
24 Jan 2002
Figure 4. Internal Battery Charging Arrangement
c) The battery should be left on charge for approximately eight (8) hours, or overnight.
After charging, disconnect the charger and place the Mode Selector switch into the
AMMETER position and Press-To-Test. If the Self-Test indicator illuminates GREEN,
and the Battery Status indicator is OFF, the unit is sufficiently charged to return to
service.
NOTE
: If the unit must be used before full charge is reached, the unit may be returned
to service temporarily if the Self-test indicator and the Battery Status indicators are
both on (GREEN and AMBER, respectively). The unit MAY NOT be returned to
service if the Self-Test indicator is RED.
d) If the Self-Test indicator comes on RED after a full charge cycle, the test set should be
returned to BaseWest for service.
5.3 Battery Replacement
The internal rechargeable Ni-Cad battery should provide several years of service. Use the
following procedure to replace the battery when necessary.
a) Turn the test set face down on a stable surface. Remove four (4) screws on bottom of
instrument case.
Charger Receptacle
AC Charger
P/N 36-1002