DAC1 USB
Instruction Manual Revision D
Page 50
Internal Settings
Removing Top Cover
The
DAC1 USB
cover must be removed to
gain access to the jumpers. Do not attempt
to remove the faceplate or rear panel.
CAUTION: The
DAC1 USB
contains static
sensitive components and should only be
opened by qualified technicians. Static
discharge may cause component failures,
may affect the long-term reliability, or
may degrade the audio performance. Use
a static control wrist strap when
changing jumper settings.
CAUTION:
•
Disconnect AC power by unplugging
the power cord at the back of the
DAC1 USB
.
•
Remove only the 8 screws holding the
cover (4 on each side).
•
Do not remove any screws on front or
rear panels.
•
Never remove the power entry safety
cover in the rear corner of the
DAC1
USB
.
•
Always connect a static-control wrist
strap to the chassis before touching
any internal component.
Jumpers
The following functions are jumper
configured:
•
10 dB Headphone Gain Reduction
•
Headphone Switch Disable
•
XLR Output Pads
•
Default Digital Input
•
Coaxial Input Termination
A 2-pin jumper plug at header P2 can be
moved in order to select a default input which
will be selected upon each power-up. A
jumper at JP7 can be removed to disable the
75-Ohm termination on the coaxial digital
input. Four 8-pin headers (P4, P5, P6, and
P7) allow selection of the output level at the
XLR jacks.
CAUTION: Do not remove jumpers at JP3,
JP4, JP5, and JP6. The
DAC1 USB
will
not function without these jumpers.
Jumpers should never be installed on
header P9.
Default Digital Input (P2):
A 2-pin jumper on header P2 (see Photo 1)
can be used to choose an input source which
will be active upon each power-up.
The 2-pin jumper sets the power-up default
input to:
•
USB Input *** (Jumper plug between pins
1 and 2 of the header)
•
Coaxial Input (Jumper plug between pins
3 and 4 of the header)
•
XLR Input (Jumper plug between pins 5
and 6 of the header)
•
Optical Input (Jumper plug between pins 7
and 8 of the header)
*** = Factory Default
P2
1 2
3 4
5 6
7 8
Photo 1 – Default Digital Input (P2)
