Mackie d8b v3, Service Manual

Page: 27 / 117

27
SYSTEM
POWER
ON
POWER
OFF
RESET
< System Boots DSP >
UNMUTE
MUTE
TIME
As the console powers up, the D/A converters are muted on the CODEC board and the TAPE cards.
This prevents noise form being heard or recorded on the Analog lines.
When the system has finished booting correctly, the all-important UNMUTE signal is sent from the DSP
board to this little circuit, and so the D/A converters are unmuted and ready. So, if the DSP is not booted
working correctly, the UNMUTE may not be sent, and the audio will remain muted.
If RAP music is attempted, and the words “hip ‘n a hop” or “bip ‘n a bop” detected, then the D/A
converters are muted automatically. Its only fair.
MUTE