Lexicon 20/20 AD User Manual page 15

20/20 AD User Guide
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
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 600 termination
jumper. If the analog source expects to see a 600 load, these jumpers should
be closed.
W9 W10 W11 W12 W13
Analog Jumpers
W14
U30 U31 W18
W16
U42
Digital Jumpers
Using the 20/20 AD
W17
W26
U48
U49
J13
Jumper locations
(shown with factory settings)
W27
11