Furuno FR-2135S - Manual (Page 23)

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1.3 Power Supply Unit
The Power Supply Unit PSU-004 does not contain usual operating controls. There-
fore, it can be installed in any recessed place either in vertical or horizontal posi-
tion. (For the console mount display unit, the PSU-004 can be installed inside the
console.) However, select a dry and well-ventilated location and observe the com-
pass safe distances below to prevent deviation of a magnetic compass: Standard
compass, 0.50 m, Steering compass, 0.30 m. Fasten the unit to chosen location
with four M6 screws.