Lexicon 20/20 AD manual Analog Jumpers

20/20 AD User Guide Using the 20/20 AD

The following figure indicates the locations and factory settings of these jumpers on the board. In their closed positions, the jumpers have their right two (or lower two) pins shunted together. To open a jumper, move the shunting block to the left (or upper) two pins. (Note that the jumpers in J13 have only two pins; to open, simply remove the shunting block.)

W1 W2 W9 W10 W11 W12 W13 W14

Analog Jumpers

		W17
U30	U31 W18	W27
W16		W26
	U42	U48
		U49
		J13

Digital Jumpers

Jumper locations

(shown with factory settings)

Note that the 20/20 AD’s analog inputs are not transformer isolated. It is, therefore, necessary to have one ground connection between the 20/20 AD and the audio source.

In addition to the ground lift jumpers, each analog input has a 600Ω termination jumper. If the analog source expects to see a 600Ω load, these jumpers should be closed.

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