mc²56 MKII Technical Manual
V5.10.2/1
267
Chapter 4: Service/Maintenance
DALLIS Unit(s)
Master Board: LEDs & Switches
A choice of DALLIS
support different connections to/from the Nova73. All versions provide similar
front panel functions:
ACTIVE LED
Flashes green when the card’s internal control system is
booted and running.
The
ACTIVE
LED on each Nova73 module, or DALLIS card,
should blink in time with all other
ACTIVE
LEDs (at 1Hz).
This shows that the card is synchronous to the rest of the
system. If an LED is out of sync, then check that the card is
fitted correctly, and if the symptom persists, replace the card.
WCLK OK
LED
Illuminates in green when the DALLIS is receiving a valid sync
signal.
POWER OK
LED
Illuminates in solid green when the DALLIS PSUs are running
normally.
If the LED flashes, then there is a PSU error.
ALARM LED
Illuminates in red when the
WCLK Port
The DALLIS can be synchronised to an external sync
reference connected to this BNC.
I/O Ports
See
for details on the different I/O
connections.
On some boards, LEDs show the status of the signals
arriving at the connection.
CTRL Port
This port can be used to connect a local computer to update
firmware or provide diagnostics.
Silk Screen
Shows the part number of the master board.
Further information can be found in the data sheet, available in the "
" guide.
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