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52 Operating Manual for RS-232 for XT/HPD 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 CR13, CR14, and CR141 on its PCB. Refer to
Figure , ‘Figure 2.3, RS-232 Interface PCB continued.” 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 CR13 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 CR14 indicates that a transparent restart caused by noise in
the master processor circuitry has occurred.
The red COP LED at CR141 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.