13.2.2 Hot patchability
The front panels of CPU cards and interface cards (not rear panels), and all
external power supplies and fan card assembly are hot patchable– that is,
they can be plugged in or removed from the matrix while the power is on, and
they will be neither damaged, nor will they cause damage to the system.
In addition, the system smoothly incorporates a newly added card. Sometimes
re-inserting a CPU card can reset the matrix. Replace CPU cards during
maintenance down times if possible.
13.2.3 Onboard processors
If one analog port interface malfunctions, the malfunction will normally affect
only the panels connected to that analog port interface. The malfunction should
not affect any other cards or panels in the system. In all cases, removing a
faulty card affects only the devices connected to that card.
13.2.4 Fail-Safe communication
In the event of a CPU card failure, the second CPU card takes over operation of
the system, while the first card is repaired or replaced.
13.3 Troubleshooting
When attempting to identify the cause of the trouble, it is helpful to begin with
the two most basic areas which cause malfunctions:
• The flow of electric current from the power supplies to the cards.
• The flow of data between the program software, the circuit cards, and
the attached audio devices.
13.3.1 Troubleshooting power supply problems
Electric current in the matrix starts in the external power supplies and travels
through the PSU internal PSU assembly to the backplane connectors, and then
travels to the circuit cards themselves. When power-supply problems occur,
those four areas—the power supplies, the internal PSU assembly, the
backplane connectors, and the circuit cards—should be explored to identify
where the trouble is occurring. Solving power-supply problems starts with
identifying the specific component causing the problem.
The matrix’s backplane connectors are part of the matrix’s infrastructure and
are not serviceable by field personnel. If it is determined that a problem is in
the matrix’s backplane connectors, the matrix must be returned for repair.
Backplane connector malfunctions are rare, but should be considered as
possibilities.
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