Service manual

QuadMADI (SUN820-211 and SUN820A211) continued

LED INTERPRETATION

1(red) UpError – If Error is also on then this

signifies that the Transputer error originated on

this card. If Error is off and UpError is on then

the Transputer error came from another card

2, 3, 4, 5 (green)Link0123–Link activity indicators

6(green) Error – Transputer Error light

7(red) Reset – Lights when the card is being reset

8, 9, 10, 11, 12 (yellow) Transputer soft LEDS – These have

different meanings depending on the stage of

the boot sequence. Once the desk is booted the

leftmost LED should be ON. The other four

come on if the corresponding port is muted (too

many errors). The second left represents port 0,

third left port I etc.

13, 14, 15, 16,

17, 18, 19, 20 (yellow) 96K Soft LEDS – The rightmost two of

these LED’s should be flashing. If either stop it

indicates that one or both of the metering

processors has crashed.

2121 (green) Word Clock OK – If this LED is on it

indicates that word clock is present in the rack

and that it is of 50/50 mark space ratio and that

it lies somewhere between 32K and 54K in

frequency. In other words it indicates that the

rack has a good quality wordclock.

There are two LEDS for each port that indicate the following

22, 24, 26, 28 (red) MADI Error – If this LED is on it means that

one or more of the following conditions has

been met.

1. the cable is broken causing TAXI violations

2. there are parity errors on the MADI stream

3. the MADI stream does not contain 56

channels

23, 25, 27, 29, (yellow) TAXI/MADI mode – This LED indicates

what format the port is running;

Off = TAXI mode i.e. it should be connected to

an IOS or MTI rack

On = MADI mode which means it is available

for external MADI connections (i.e. multitrack)

Digital Service Manual

Issue 3 Page 17

SUN820-211