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SERVICING THE AT10.1
58
3.5. REPLACING DEFECTIVE COMPONENTS
WARNING:
High voltages appear at several points inside the battery charger. Use
extreme caution when working inside the charger. Do not attempt to
work inside the charger unless you are a qualified technician or
electrician.
Disconnect and lock out all power from the battery charger before
starting to remove or replace any components. Turn the ac power off at
the distribution panel upstream from the battery charger. Disconnect the
battery from the charger output terminals.
NOTE: Refer to the drawings in Appendix C while performing the
following procedures.
Removing the safety shield
Some of the repair procedures described below require you to remove the
clear plastic safety shield over the I/O (input/output) panel inside the front
panel. You remove the shield by taking off the wing nuts on the front.
Don't lay the shield on the top of the charger; the top vents are needed for
cooling.
CAUTION: Hazardous ac and dc voltages are present on the I/O
panel terminals and several internal components.
Removing the enclosure shroud
You may need to remove the enclosure shroud in order to make some
internal measurements, and to replace or repair some components.
Remove all power from the charger. Remove the eleven screws that hold
the shroud on the rear and bottom of the enclosure, then the two screws on
the left side that hold the rectifier heat sink assembly. Support the front
panel and lift the shroud straight up to remove it. Be sure to save the
plastic washers from the door hinge.
The heat sink assembly is supported from the rear panel. Avoid putting
any mechanical stress on the heat sink.
Replacing the enclosure shroud
Lower the shroud onto the enclosure base. Install and tighten the eleven
screws that hold the shroud on the rear and bottom of the base before you
install the two screws that support the heat sink assembly on the left side
wall. Remember to reinstall the plastic washers on the door hinge.