MILWAUKEE ELECTRIC TOOL CORPORATION
13135 WEST LISBON ROAD • BROOKFIELD, WISCONSIN 53005 USA
(262) 781-3600
TO: AUTHORIZED portable electric tool SERVICE STATIONS DATE: March 2009
factory SERVICE CENTERS
TOOL(S) \ PRODUCT(S) AFFECTED: 2401-20 M12 Screwdriver, 48-11-2401 12V Compact Lithium-Ion
Battery Pack, 23-66-1095 Electronic Switch Module Assembly
SUBJECT: “23-66-1095 Electronic Switch Module Assy versus 48-11-2401 12V Compact
Lithium-Ion Battery Pack”
Symptom Possible Cause(s) Solution(s)
switch -
trigger
‘quick-pull’ –
no power
Battery Pack
An aged / used 48-11-2401 12V battery Pack can lead to the
impression of a bad 23-66-1095 Switch in the M12 Screwdriver – if
the trigger can be pulled slowly and deliberately versus a
‘quick-pull’ allowing the tool to turn-on and run – the battery pack
is to blame.
switch no power
Switch electronics FET
Switch electronics FET may be faulty – attempt to run screwdriver
with known-good battery pack.
Battery Pack connected
to Charger - alternately
flashing red/green
Charger lights
Bad connection between
Battery Pack and Charger
battery pack only part-
way-in-charging-bay
and/or ‘rocked’/ moved
during charge cycle
Aged / Used Battery Pack -
Faulty Battery Pack -
FULLY seat battery pack into charger – a slight tap on the battery
pack may be needed to fully seat pack. NOTE: with alternately
flashing red/green Charger lights unplug the Charger from power
source and let it sit until the lights stop flashing – this allows circuit
board capacitor to self discharge.
A fully charged aged / used battery pack can cause a flashing
red/green condition; run/drain battery pack and retry charging on
known good Charger. If Battery Pack takes a normal charge it is
functional - if the period of run time becomes noticeably shorter with
a normal charge, this indicates the end of the Lithium Ion battery
packs service life; customer should replace battery pack with a new
Lithium Ion battery pack.
Pack may not be accepting charge or switch electronics FET may be
faulty. Attempt to charge Battery Pack on known-good Charger.
Tool’s Battery Pack fuel
gauge drops to NO
lights after one or two
screw insertions – no
LEDs lit or blinking.
DEFECTIVE Battery Pack Battery Pack shows four lights, and then – battery pack is ‘dead’–
fuel gauge drops to NO lights after one or two screw insertions and
fails to rebound after 30 seconds of non-use
Battery Pack Protection Battery Pack Protection - to protect itself from damage and extend
its life, the battery pack’s intelligent circuit monitors current draw and
temperature. In extremely high torque, binding, stalling, and short
circuit situations, the battery pack will turn OFF the tool if the
current draw becomes too high. In these situations, the tool will
"buzz" for about 5 seconds before it turns OFF. To reset, pull and
release the trigger. Under extreme circumstances, the internal
temperature of the battery could become too high; the battery pack
will then shut off.
This bulletin is for informational purposes. PLEASE NOTE ON SERVICE PARTS LIST: 54-04-2400, 54-42-2400
O INFORM YOU
PRODUCT
SUPPORT
BULLETIN # 493
(2 pages)
(2 pages)
(13 pages)
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