Operation
Troubleshooting
48
Operating Manual for GPIB for XPD 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 D5, D4, and D1 on its PCB. Refer to Figure 2.3,
‘GPIB 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 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 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.
