Electro-Numerics RACECLOCK MM-01 Operating and safety instructions

MILEMARKER, MM-01
BATTERY REPLACEMENT PROCEDURE
Milemarker Raceclock model MM01, utilizes two internal sealed lead-acid batteries for clock operation. With
fresh, fully charged batteries installed, the clock will operate for approximately 10 hours. These batteries, EN part
number 860-008, are 6V and are connected internally in series to provide 12V operating voltage. Battery kit,
MM01-BK provides the correct replacement batteries and the necessary replacement parts which are removed
during battery replacement.
To replace the batteries, it is necessary to partially disassemble the clock.
1) Using a Philips screwdriver, remove the 12 screws around the base of the clock.
2) Insert the screwdriver into the lower vent-slots on the ends of the clock and gently pry upward, pushing the
base downward to separate the top enclosure from the base. Alternately pry each end until the top enclosure
is completely free from the base.

3) With the enclosure top free from the base, carefully lift the enclosure top and lay it on the table behind the
clock being careful not to disturb the wires connected between the enclosure top and the base.
4) Remove the (+) positive (red wire) and (-) negative (black wire) from the batteries. There is a small amount
of silicone adhesive on the terminals to keep them in place.

Ribbon cable tie-wrap
Top strap
Large bottom tie-wrap
5) Cut the top strap, the large bottom tie-wrap and the small ribbon cable tie-wrap. When removing the top
strap, note how the strap is fed through the buckle for re-installation of the new strap.
Cut the ribbon cable tie-wrap
Cut the top strap Cut the large bottom tie-wrap

Remove the black jumper wire
6) Remove the black jumper wire from the left-hand battery positive (+) battery terminal and the right-hand
battery negative (-) terminal. There is a small amount of silicone adhesive on the terminals to keep them in
place. Remove the two batteries. There is a small amount of silicone adhesive underneath the batteries to
keep them in place.
7) Note the orientation of the batteries for re-installation. Apply a small amount of silicone to the clock base
under the new batteries and between the batteries and the center (molded) post. Position the batteries as
shown. Install the large bottom tie-wrap. Tighten using neddle-nose pliers and trim the end.
Remove the two batteries
Install the new batteries noting the orientation Install the large bottom tie wrap
Center (molded) post

Tighten the bottom tie wrap
8) Install the new top strap and buckle. Reference how the old strap was fed through the old buckle when
installing the new buckle. Trim the ends.
Trim the bottom tie wrap
Install the top strap starting on the right Feed the strap as shown
Install the top strap buckle Tighten and trim the ends

8) Install the black jumper wire from the left hand battery (+) positive battery terminal and the right hand battery
(-) negative terminal. Add a small amount of silicone adhesive on the terminals to keep them in place. install
the two power wires with the red wire to the right-hand battery positive (+) terminal and the black wire to the
left-hand battery negative (-) terminal. Add a small amount of silicone adhesive on the terminals to keep
them in place.
9) Install the ribbon cable tie wrap and trim. Check the operation of the clock with the top cover still not
installed. With the clock functioning correctly, install the top cover, being careful not to damage the wires.
Push the cover down firmly to snap into the bottom plate. Install the 12 screws to retain the top cover to the
bottom base.
Install the black jumper wire Install the two power wires
Install & trim the ribbon cable tie wrap Install the top cover
Electro-Numerics, Inc.
42213 Sarah Way, Temecula CA 92590
Tel: [phone] or 951-699-2437