D950 Digital Mixing System
9-6 Troubleshooting/Maintenance SW V3.3 Date printed: 03.09.03
9.3.2 Looking at the LEDs
9.3.2.1 LEDs of the MEMNET Card, 1st Generation 1.950.615.20
FAIL The red FAIL LED on a working card normally should be off. It is on
whenever the card fails or it is reset either manually or by the system.
IDLE The green IDLE LED has a special meaning on the MEMNET card. Its
flashing rate depends on how much communication is going on. The busier
the system communication is, the higher is the flashing rate. No flashing
could mean that the PC system is not working, or that the MEMNET flash
EPROM is being erased.
SYNC The green SYNC LED turns on whenever a valid AES/EBU SYNC input
signal is fed to the MEMNET SYNC input, and the system has locked to
the external clock. When the LED is off the core operates from its internal
48 kHz clock source.
IF 1...4 Only the first of the four green IF LEDs is used on a MEMNET card.
When it is on, the optical-fibre link to the PC is valid. When it is off, either
the core or the PC is shut down, or the optical link is broken. The IF 2...4
LEDs are not used.
Card number The card number has no real meaning on a MEMNET card during normal
operation and should simply be set to a non-zero value. When the card is
reset while this number is zero, the flash EPROM memory will be erased.
This can be useful when the core system must be forced to reload a con-
figuration for whatever reason.
Connectors The first interface (SC connector) is used to connect the core to the Con-
trol PC. When the connection is done properly, the IF1 LED will be green.
The three remaining SC connectors are not used.
RS 232 This serial interface is used only for card testing during manufacturing.
Do not connect anything during normal operation!
4
2
FAIL
IDLE
SYNC
IF 3
IF 1
IF 2
IF 4
RS 232
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