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Troubleshooting
50 Operating Manual for RS-232 for XPD Series Power Supply
Troubleshooting
Diagnostic
LEDs
This section describes the diagnostic LEDs found on the RS-232 interface.
Computer Operating Properly (COP) LEDs The RS-232 interface provides
three diagnostic LEDs, located at D5, D4, and D1 on its PCB. Refer to Figure 2.3,
‘RS-232 Interface PCB” on page 18, for their locations. At present, these LEDs
turn on to signal COP events for the interface's microprocessors. Issue a RST
(reset) command to turn off the diagnostic LEDs.
The green COP LED at circuit designation D5 indicates that the RS-232 interface
microprocessor successfully recovered from a timeout error due to a
communications bus error. The event is transparent to the RS-232 communications
line continues to function normally.
The red COP LED at D4 indicates that a transparent restart caused by noise in the
master processor circuitry has occurred.
The red COP LED at D1 indicates that a transparent restart caused by noise in the
slave processor circuitry has occurred.
WARNING
Exercise caution when using and servicing power supplies. High energy levels can
be stored at the output voltage terminals on all power supplies in normal operation.
In addition, potentially lethal voltages exist in the power circuit and the output
connector of power supplies which are rated at 40V and over. Filter capacitors store
potentially dangerous energy for some time after power is removed.