BASEWEST
Operating & Maintenance Manual
Model TS-421 Test Set
Page 7 of 8
25-60-45
21 December 2023
4.0 Care & Maintenance
4.1 The TS-421 test set is a sensitive electronic instrument and should be handled 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 enclosure is not completely sealed; keep the test set away from rain, spills,
and fluids to prevent damage to internal electronics.
•Do not apply external electrical inputs other than the P/N 36-1019 AC charger.
Prior chargers 36-1002, 36-1005 can be used.
•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.)
•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 replaceable P/N 6-1036 NiMH rechargeable battery is part of the back panel of the
test set enclosure and is replaced together. The battery is on-condition and has an
expected 5 to 7 year life. The battery should be replaced when the charge retention level
becomes unacceptable. Battery replacement can be accomplished at any time without
affecting calibration. Replacement is accomplished as follows:
•Remove protective cover.
•Remove back panel/battery assembly of the test set; retain 4 attach screws.
•Disconnect the battery connection to the test set and discard the old back
panel/battery assembly.
•Connect new the battery connection on the replacement back panel/battery
assembly with same orientation.
•Secure new back panel/battery assembly with four attach screws.
4.5 The unit is provided with a P/N 36-1012 two-prong European-type adapter to mate with
the 36-1019 AC Charger. Other adapters may be used so long as the input voltage is
either 110/120 or 220/240 VAC.
