Tascam RC-898 - Manual (Page 14)

Section 2.2 - Rear Panel
2-6
[45] DIP switches (1 & 2)
The two DIP switches are both on when in the
down position. As shipped from the factory,
switch 1 is off (up) and switch 2 is on (dow), and
you probably will not need to change them.
However, when a passive device is connected to
the
EXT 1 connector and power is not provided
from the device to the tally supply pin, this switch
1 (
TALLY POWER ) should be set to the on
(down) position, allowing the RC-898 to use its
own power for this purpose.
Switch 2, GND LIFT (ground lift) controls the
isolation of the ground of the RC-848/DTRS sys-
tem from the ground of devices attached to the
EXT 1 and EXT 2 ports. Usually this switch is in
the on (down) position, but you may need to turn it
off (up) if your system suffers from hum prob-
lems. However, a full discussion of ground loops
and their associated problems is outside the scope
of this manual, and we recommend that you con-
sult one of the many reference works on this sub-
ject if necessary.
[46] Contrast
This control alters the contrast on the backlit LCD
display screen [11]. Use it to set the screen so that
it is easily visible from your preferred viewing
angle.