HP sv6 - Manual (Page 106)

hp scalable visualization digital compositor
compositor self-test sequence
Appendix A 106
the values should match. If the value does not match, two failing cards
are identified, the one driving the test value and the one receiving the
test value, as it is impossible to determine which of the two cards has the
failing bus connection.
testing output or input cards
The test can have two results. One is success. The other is failure, along
with a list of one or more cards that failed. This result is accessible to the
host through the compositor protocol. The result is also available without
the host. A successful test puts the cards into normal operation. If the
test fails, the speaker on the compositor sounds a long, low-pitch, failure
beep. If the controller has the ability to talk to the failing card or cards, it
will set the LEDs to red. This way the operator will be able to visually
identify failing cards.
testing controller cards
This procedure does not do any specific test of the controller card
backplane connections. Being a single connector, and having a position
that is the same for all configurations, it is believed that failure of the
card upon installation is unlikely. In the event there is a bent pin or a
poorly seated controller card, it is likely that the controller card will not
function at all, since it controls the power switch and the processor that
can test the other cards. Although very unlikely, it is possible that an
input or output card that fails the test may actually be a failure of one of
the pins on the controller card.
The test procedure depends of a few of the bus connections in order to
detect that a card is present in a slot. If one of these critical signals is
shorted or open, the test may miss a failure by not knowing that a card is
even in the slot, or the test may misidentify a card.
LED indicators
LED1 Card LEDs
ON=Compositor ready Green = Working and connected
OFF= Compositor not ready Yellow = Cable not connected, no signal
Red = Unintialized or ERROR