Replacing The Battery Pack - ABB STT04 Instruction Manual

REPAIR/REPLACEMENT AND UPGRADE

REPLACING THE BATTERY PACK

WARNING
REPLACING THE BATTERY PACK
6 - 2
8. Avoid static charges during repair. Make sure circuit board is thor-
oughly clean around its leads but do not rub or clean with an insulat-
ing cloth.
NOTE: An antistatic kit (field service kit, ABB part number
1948385?1) is available for personnel working on devices contain-
ing MOS components. The kit contains a static-dissipative work sur-
face (mat), a ground cord assembly, wrist bands and alligator clip.
1. Power off the STT04 terminal.
2. Place the STT04 terminal on a table or smooth surface with the
keypad facing down.
3. Remove the four screws from the lower case of the terminal.
4. Carefully lift the lower case off the PC board.
5. Grasp the PC board by the edges and turn it over so the compo-
nents on the board are facing up (Fig. 6-1).
6. Carefully disconnect the keypad connector strip from the PC
board. This will allow the PC board to lie flat next to the upper case
assembly.
To prevent ignition of a hazardous atmosphere, batteries must
only be charged or changed in an area known to be
nonhazardous.
7. Locate the battery pack connector on the circuit board (Fig. 6-1).
8. Squeeze the end of the connector tab and pull the connector from
the circuit board.
9. Remove the screw securing the battery pack (Fig. 6-1).
10. Place thumbs on the clips that secure the battery pack.
11. Push the clips away from the battery pack while using your fin-
gers to release the battery pack from the clips.
12. Remove the battery pack and dispose properly.
13. Turn the replacement battery pack over (batteries facing down),
and insert the bottom tabs under the Stop on the housing (Fig. 6-1).
14. Press down at the top of the battery pack until it snaps securely
into place.
15. Replace the screw that secures the battery housing.