BASEWEST
Operating & Maintenance Manual
Model TS-421 Test Set
Page 7 of 7 25-60-45
2/15/23
4.0 Care & Maintenance
4.1 The TS-421 test set is a sensitive electronic instrument; it should be treated and protected
with appropriate care. Damage from obvious abuse cannot be covered by warranty.
Be particularly careful to protect the touchscreen from any physical damage
(damage to the touchscreen is not covered by warranty).
The case is not completely sealed; keep away from rain, spills, and fluids to
prevent damage to internal electronics.
Do not apply external electrical inputs, except AC charger provided.
Protect from extreme temperatures and humidity; it is best to store the instrument
in temperature-controlled spaces.
It is recommended to keep the protective cover in place at all times except for
battery replacement. (Note: the back of the protective cover is provided with a
rotating stand that can be removed if it is not useful to the operators.)
Avoid excessive exposure to sunlight and UV radiation.
4.2 Maintenance is limited to wiping the unit enclosure and touchscreen down lightly with a
clean cloth moistened with alcohol. DO NOT use cleaners or solvents.
4.3 Field repairs except battery replacement are not authorized and will void warranty.
4.4 The P/N 6-1036 NiMH rechargeable battery is rated at a nominal 5-year life. Battery
replacement, when required, is accomplished as follows:
Remove protective cover.
Remove back panel of the test set enclosure; retain 4 attach screws.
Note: the removable battery pack is nested in the back panel.
Disconnect battery connection.
Separate the battery pack from the back cover carefully (Velcro attachment).
Install the new battery pack in the same location and orientation.
Reconnect battery connection.
Reinstall back panel with installed battery pack with four attach screws.
5.0 Calibration
A separate BaseWest calibration manual, 25-60-46, is provided with each new unit, and is
available on the BaseWest website. Calibration is recommended on one-year cycles but
is dependent on user requirements. Calibration can be accomplished without opening the
test set body.
