AMETEK HPD Series - Manual (Page 52)

Operation
Troubleshooting
50 Operating Manual for GPIB for XT/HPD 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 CR13, CR14, and CR141 on its PCB. Refer to
Figure 2.3, ‘GPIB Interface PCB” on page 17, 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 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 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.