Switch Hardware
If a model A power supply goes into shutdown, it will remain shut down until the power switch is turned off and turned on again (power cycle). The power switch must remain off long enough for the SHUTDOWN LED to extinguish (this allows the capacitors to discharge).
WARNING! A replacement AC power supply should never be placed in an 
contains a DC power supply, and 
these instructions are not heeded, there is a risk of electrical shock, danger to personal health, and serious damage to the equipment.
If the power supply needs to be replaced, please refer to Chapter 3, Hardware Maintenance Procedures, for
