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52 Operating Manual for GPIB for XHR/XFR Series Power Supply
Troubleshooting
Diagnostic
LEDs
This section describes the diagnostic LEDs found on the GPIB interface.
Computer Operating Properly (COP) LEDs The GPIB interface provides
three diagnostic LEDs, located at CR167, CR166, and CR89 on its PCB. Refer to
Figure 2.3, ‘GPIB Interface PCB” on page 22, 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 CR167 indicates that the GPIB interface
microprocessor successfully recovered from an illegal operating code. The event is
transparent to the GPIB communications bus and the GPIB interface continues to
function normally.
The red COP LED at CR166 indicates that a transparent restart caused by noise in
the master processor circuitry has occurred.
The red COP LED at CR89 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.