1.
Flip ET312B over, back side facing up.
2.
Remove silver warranty sticker and other sticker (if present) to expose case screws.
3.
Using a phillips-head
screwdriver: remove (2) case screws. Set aside.
4.
While holding top and bottom of case together, carefully flip unit up, with front
panel facing up.
5.
With power OFF: remove power switch cap by pulling it straight out.
6.
Lift bottom edge of front panel using orange
wood stick (supplied). Gently pry bottom edge up
and over bottom (2) switches.
7.
With front panel loosened: lower unit so that front panel
faces toward you, top side facing up.
8.
Continue lifting top half of case away from base and rotate it, keeping the front panel side
facing the LCD,
switches, and rest of ET312.
9.
Identify battery in rear part of enclosure. It will be connected to the circuit board with two wires,
one Red and one
Black.
10.
Compare the installed battery to the replacement battery included in kit. Make sure you can
identify the Red (+) and Black
(-) terminals on the new battery. They are color-coded for easy
identification.
11.
Remove the Red and Black wires from the original battery
by wiggling the terminal lugs up and
down while pulling outward. If needed, a small pair of insulated needle-nosed pliers may
be
helpful
in pulling the terminal lugs. Pulling from the wire will most likely cause the wire to
separate from the lug – make sure
to wiggle or push the lug itself, not the wire.
12.
Once the battery leads have been removed, remove (4) phillips-head screws from
the far
edges of the base of the battery bracket. These screws attach the battery assembly to the
bottom of the enclosure. There
is no need to remove the other (4, larger) screws.
13.
Once removed, lift the battery assembly up and out and set aside.
14.
Replace new battery
assembly into same position as original battery.
15.
Remove caps that may be covering battery terminals.
16.
Replace (4) phillips-head screws
into far edges of the base of battery bracket, making sure to
align the battery with the mounting posts in the case bottom. Tighten
enough to secure the
battery. Do not use excessive force.
17.
Connect the Red wire to the Red (+) terminal of the battery. Push terminal lug
are far onto
battery tab as possible.
18.
Connect the Black wire to the Black (-) terminal of the battery.
Push terminal lug are far onto
battery tab as
possible.
19.
Ensure that battery is securely mounted to base of enclosure.
20.
Ensure that Red and Black wires are securely attached
to proper terminals of battery.
21.
Fold top half of enclosure back towards bottom half. Front and rear panels should slide into
their respective
slots in bottom half of case.
22.
Once top half is almost completely mated to bottom, press bottom edge of front panel inward
over bottom (2)
switches (OK and Down) and continue closing enclosure. While holding top
and bottom halves together, flip unit over so that the
bottom side faces up.
23.
Replace bottom case screws (2). Tighten with enough force to secure case.
24.
Replace power switch cap. Power unit
up.
25.
We advise allowing
your new battery to charge before using it. 8 hours or so is usually
sufficient to bring it to a fully charged condition.
26.
Wrap electrical
tape (or packing tape) over exposed lugs of old battery. Recycle old battery at a
local battery recycling station.
