Help with designator acronym, please ?

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Externet

Joined Nov 29, 2005
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In four places RNF shows on a schematic.
Left near center by 'orange white'
Right top between circled 5 and 7,
Lower right, inside 'timer' and by 'DC in'

What is RNF supposed to mean ? Anyone knows ?
The weird image is because schematic is printed on mirror mylar film, not paper.

1601258200796.jpeg
 
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