Furuno TS-331A - Manual (Page 53)

6. CATCH SENSOR OPERATION
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3. Pull out the battery cap together with the main housing from the polyurethane
housing.
Battery Cap Main Housing
Main housing and battery cap
4. Unscrew the battery cap from the main housing to access the battery holder.
Battery Holder
Battery cap separated from main housing
5. If you are replacing dead batteries, remove dead batteries.
6. Coat battery contacts with a slight amount of silicone grease.
7. Insert three new “D” (International Standard Number R20) alkaline batteries
in the battery holder, all batteries plus (+) side up.
Battery inserted plus (+) side up.
Install batteries with correct
correct polarity.
Improper polarity may cause
the batteries to explode.
WARNING
Batteries inserted in battery holder