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20 4: Troubleshooting the 4092A
Caution
When opening the top cover and changing the power supply settings, use proper ESD precautions.
This includes ensuring that you are properly grounded before touching the internal PWA of the
unit to change the jumper settings.
Required for this procedure:
#1 Phillips screwdriver
To change the jumper setting:
1. Disconnect both power supplies from their power source.
2. Using a #1 Phillips screwdriver, remove the top cover.
3. Move the jumper one position to the left to the 2S position.
4. Replace the top cover.
5. Reconnect the power supplies.
4.6 Replacing Power Supplies
For units with a single power supply, the normal LED state is for one LED to be green and the
other not lit. For units with dual power supplies, the normal LED state is for both LEDs to be
green.
If a power supply LED is red, check that the affected power supply is connected to a properly
functioning 100–240 VAC, 50/60 Hz power source. If the LED remains red, you should replace
the power supply.
For AC power supplies, use only TSC 4501A power supplies. For DC power supplies, use only
TSC 4502A power supplies.
In a unit with dual power supplies, you can hot swap the power supplies. This means you can leave
the working power supply connected to power and all input and output devices connected when
you replace the failed power supply.
Power supply jumper configured for
one power supply (in the 1S position).