Specifications

HD I/O Guide40
Switching Jumpers on the
Analog Output Card
Each Analog Output card for HD I/O provides a
jumper for each of the eight channels of output
on the card to switch between a Hi and Lo out-
put setting. The default setting for each jumper
is Hi. This is what you want for working with
professional gear that operates at +4 dBu levels.
However, if you are working with –10 dBV gear,
you can switch the jumper on Analog Output
card (on a channel-by-channel basis) from the
default Hi position to Lo for a –6 dB pad. You
can then adjust the Trim pot for the correspond-
ing output channels by an additional –4 dB to
accommodate –10 dBV gear.
To switch the jumpers for output channels on an
Output card:
1 Remove the Output card from the HD I/O
chassis (as described in Appendix A, “Adding or
Removing I/O Cards”).
2 Place the card on a stable, static free surface.
3 Using tweezers or a pair of needle nose pliers,
gently remove the jumper for each output chan-
nel that you want to modify.
4 Gently, but firmly, replace the jumper in the
position that you want for Hi or Lo output:
• Place the jumper so that it connects the
middle pin and the back pin (furthest from
the DB-25 connector) for the Hi setting
(this is the factory default setting).
• Place the jumper so that it connects the
middle pin and the front pin (closest to the
DB-25 connector) for the Lo setting (–6 dB
pad).
5 Replace the Output card in the HD I/O chassis
(as described in Appendix A, “Adding or Remov-
ing I/O Cards”).
Pin orientation on Output card