Instruction manual

DAC1 PRE Instruction Manual Rev I Page 8
Front Panel
Input Status Display
The DAC1 PRE has a six-LED input-selection
indicator on the front panel. These LED’s
flash when an error condition occurs on a
selected digital input. All LED’s turn off when
the DAC1 PRE is in Standby Mode or is
turned off.
The numbers next to the LED’s match the
numbers adjacent to the digital connectors on
the rear panel. Digital input “1” is TOSLINK
Optical. Inputs 2, 3, and 4 are RCA Coaxial.
Error Indication
The Input Status Display will flash when an
error occurs on the selected digital input. The
type of error is indicated by the number of
flashes before standby engages.
Error Codes:
• No signal – 16 slow flashes – audio muted
• Data transmission errors - 16 flashes –
audio muted
• Non-PCM – 16 flashes – audio muted
• Non-audio – 32 rapid flashes – audio muted
• Invalid sample (v-bit) – 64 very rapid
flashes – no mute
Common causes of errors are:
• Disconnected cable
• Data drop-outs due to a bad cable
• Incompatible data type (AC3, ADAT, etc.)
• Non-Audio data
If the error is not resolved within +/- 15
seconds, the DAC1 PRE will enter Standby
Mode. The DAC1 PRE will resume normal
operation when it detects a valid input signal
at the last chosen input. There is no error
indication on the analog input.
“Source” and “ON/OFF” Switch
The rotary Source Selector control is located
directly to the right of the Input Status
Display. Rotate the knob to select an input.
The rotary Source Selector switch is
equipped with an on/off switch. Press the
control knob to turn the DAC1 PRE on or off.
The on/off function features a soft mute and
soft un-mute function that responds very
quickly. Because of this fast response, the
on/off function also serves as a mute control.
Press the Source Selector switch to mute all
audio outputs. Press again to restore all
audio outputs.