User's Guide

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User Guide

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TFF-2220-00AA and TFF-2221-00AA User’s Guide D1436 Rev B

4.7.3 Tools

ZES does not provide the required materials and tools for changing batteries with the WhereCall

IV Tags. The following tools will be required to change the WhereCall IV batteries.

• One, torque wrench with a 5/64 inch hex drive bit and the torque set to 6.0 + .6 inch-

pounds [0.68 +

0.07 Newton-meters] for the six screws on the bottom cover of the tag.

• One, “small, pocket size” flat blade screw driver use to remove batteries from the battery

holder.

• One, ESD wrist strap or equivalent static protection device.

4.7.4 Procedure

To change the WhereCall IV batteries, the WhereCall IV must be in OFF mode and display

PWR OFF . See section 4.3 for instructions on turning the WhereCall IV off.

Step 1: Enter battery change mode as follows

Press and hold the button for several seconds until the display starts to cycle between

these options…ISO MODE, CCX MODE, DUALMODE, and CNG BATT. Release the

button when the display shows CNG BATT, then click the button again to activate the

mode. The WhereCall IV is now in a mode that draws more current in bursts to ensure

the circuitry fully discharges when the batteries are removed. This mode will expire in 5

minutes, so the batteries should be replaced within 5 minutes to ensure proper restart of

the internal processors.

Step 2: Remove the 6 screws from the bottom cover of the WhereCall IV and remove the

bottom cover and sealing gasket.