HP 650 Installation Manual page 54

Description and Operation
LEDs and Buttons
Obtaining Diagnostic Information: The Diag Button
Using a non-conducting, pointed implement such as a wooden pencil or
a toothpick, press and release the recessed Diag button on the routing
engine. (See figure 2-6 on page 2-9.)
Pressing the Diag button resets the router just as does pressing the
Reset button, plus it also generates diagnostic messages that appear on
the console, in the event log (which can be displayed from the Main
menu), and in the crash history (which can be displayed using NCL's
Crash command; for details, refer to chapter 16 of the Operator's
Reference). When the router appears to "hang," use the Diag button
rather than the Reset button. If this does not reset the router, then try
pressing the Reset button.
Some of the diagnostic tips in tables 3-1 and 3-2 refer you to entries in
the event log (which can be displayed from the Main menu) and the
crash history (which can be displayed using NCL's Crash command). To
display either the event log or the crash history, you must have a console
connected to the router before you switch the router on, with the PC or
terminal set to 9600 baud.
2-14