4535 612 10261 HD11 Service Manual Page 179
CSIP Level 1 Troubleshooting: Known Symptoms, Causes, and Corrective Actions
• Can the EMC coupling path be attenuated?
• Does operating an AM radio tuned between stations around 1,600 Hz (thus using it as an
EMI/RFI source tester) identify interference, which would be noticeable as audible static
noise on the radio while walking it around the room. Sometimes EMI/RFI sources are not
constant, but are temporary or surge situations that may only occur at certain times.
• Considering and locating the source/cause is important, but regardless of the source, since
the system is shielded against EMI and RFI, troubleshoot the system to determine if the EMI/
RFI shielding has been compromised. One place to start is to verify that all the system panels
are appropriately secured with all of the factory-approved fasteners.
System Hangs
or Crashes
Often the terms “hang” and “crash” are used interchangeably to describe the same symptom.
However, with the HD11, these two terms describe two different behaviors. It is important to
understand the difference between these terms because the causes are different, the trouble-
shooting techniques are different, and the information available to the FSE is different.
A “hang” is when the system stops responding to the keyboard. There is a normal image on the
monitor and the system may continue to be working (updated data in the image area, clock is
correct and continues changing), but the system does not respond to hard keys, soft keys, or the
trackball.
A “crash” occurs when the system detects an abnormal condition in either the hardware or the
software. When this happens, the system starts the “Crash Recorder,” which saves various logs
and memory dumps. The Crash Recorder displays a dialog box on the screen.
There is not any specific data associated with a “hang” (because from the software point of view,
everything is behaving normally. There may be something recorded in the event log which pro-
vides a clue to the cause of the hang. However, the best source of information is to ask the cus-
tomer about the keystrokes prior to a “hang.”
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