Model 4640-B Appendix C–7
C. MAINTENANCE
To exchange the rechargeable battery packs with optional alkaline
battery packs use the following procedure:
Remove the four screws holding the display panel. Lift off the
panel.
Remove the ribbon cable on the back of the panel.
Remove the protective box covering the baseboard.
Locate the two battery packs. The battery leads are red and
black with white plugs.
Unplug the leads from the baseboard. Remove the screw
holding the battery pack to the gauge base. Slide the battery
pack forward and lift out (see note).
NOTE
If necessary, loosen the plastic top shell to exchange the
batteries. After the top shell has been removed, proceed.
Insert D-size alkaline batteries in the optional battery packs.
Install the packs in the gauge in accordance with the polarity
indicated on the labels.
REMEMBER to reconnect the battery packs and the control
panel ribbon cable. Reverse the above removal procedure for
installation.
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