Envision Peripherals NV3128 manual Troubleshooting, Isolating Faults, Power

5.4 TROUBLESHOOTING

Certain features of the NV3128 facilitate troubleshooting the router.

·Power supplies and all active modules can be removed and re-inserted live without damage.

·Since mapping of the crosspoint modules takes place continuously, a crosspoint card removed and re-inserted will be updated within a few cycles of video vertical retrace.

·Removing the Universal Control/Command Interpreter will not upset the switch mapping. Re-inserting that module will re-initialize the entire switch to the default input if the module is so configured or if the backup RAM’s life is exceeded. The module is designed to mainain its settings for a few days unpowered. The backup supply is a capacitor, not a battery, so it does not require replacement.

·The Univeral Control/Command Interpreter continuously monitors the health of the power supplies.

·The NV3128 includes PC compatible computer programs that control, map, configure and provide diagnostic utilities for the system.

5.4.1ISOLATING FAULTS

The repetitive nature of router circuitry greatly simplifies the task of isolating problems in the signal paths. The following processes will isolate most problems to the board level.

POWER

A quick glance at the switch front panel will indicate the health of the power supplies and of the power distribution system. Each active module in the system has front panel LEDs that glow when the module is powered normally.

·	SYMPTOM:	All LEDs are OFF.
	PROBABLE CAUSE:	Missing AC input, blown fuses, or PS2001 problem.
	ACTION	Check AC input. Check fuses inside rear panel AC input
		connectors.
·	SYMPTOM	LEDs off on one module.
	PROBABLE CAUSE	Check fuses on module. Fuses OK? Module may be faulty.
	ACTION	Replace fuses or replace module.

NV3128 RS-422A Machine Control Data Routing Switch 5-4