Operating instructions

4. Run your finger around the outer edge of the top battery in a circular motion until one edge of the battery pops up.
Remove the top battery. Turn the unit over so the bottom battery drops out into your hand. Discard the used
batteries, regardless of age or amount of use. Closely examine the metal contacts inside the battery compartment;
check for signs of bending, breakage or corrosion, which indicates the entrance of moisture into the battery
compartment. If you see any signs of damage, return the Matrix to an Authorized U.S. Divers Dealer and do not
attempt to use it until after it receives service. If everything looks good, proceed to the next step.
5. Install two new 3-volt lithium batteries (Duracell
®
DL 2032, Radio Shack
®
23-162, Maxell
®
CR 2032, or
Panasonic
®
CR 2032) into the battery compartment directly on top of each other with the positive (+) side of both
batteries facing upward. Note: Avoid touching the metal contacts, or the flat sides of the batteries, as skin oil
impairs correct contact.
6. Lightly lubricate a new O-ring using a food grade silicone grease, such as Dow Corning 111. This grease is available
at most dive shops. Do not over lubricate. Install the new O-ring onto the battery hatch, making sure to gently
stretch it over the threads; do not roll it down the threads. Only use the proper U.S. Divers O-ring. Use of the
incorrect O-ring may void the warranty.
7. Carefully thread the battery hatch into the case back in a clockwise direction until snug. Using a quarter or nickel,
tighten the battery hatch until it is flush with the case back.
Check for Proper Function
1. To ensure that the battery installation was successful, activate the unit and watch it go through its diagnostic mode
and battery check as described on pages 15 & 16. If the battery icon is still displayed, return the unit to an Autho-
rized U.S. Divers Dealer for service.
2. Observe the LCD to ensure it is consistently clear and sharp in contrast throughout the screen. If any segments
appear dim or are missing, return the unit to your Authorized U.S.Divers Dealer for service. If everything is working
properly, proceed to the next step.
Installing the Matrix Module Back Into the Boot
1. Make sure the spacer is in the boot.
2. Place the Matrix module over top of the hole in the boot, making sure it is properly aligned. Dip the top edge of the
module into the hole and press the bottom edge with your palm until the bottom edge just enters the hole.
3. If necessary, correct the alignment of the module. Press the module completely into the boot until it “snaps” into
place.