5
POWER -
Constantly lit red to indicate the device is powered on.
ACTIVE -
Illuminates green when a loop is being driven correctly.
OVERDRIVE -
Becomes increasingly steady red as an audio signal in-
creases. If it is continuously red, the drive level of the loop is too high
and audio may be distorted.
If the ACTIVE LED is not illuminated and the OVERDRIVE LED is con-
stantly illuminated, the induction loop is disconnected or open-circuit.
Remedial action must be taken.
Audio Input Signal
•
Standard recommended input:
Computer sound card signal with typical 1 volt RMS.
•
Typical levels for larger speakers can be accepted by removing the
two jumpers on header HDR1.
•
100V ‘Line’ can be accepted in J2.
LEDs
