26 Chapter 1
Troubleshooting
Troubleshooting an Inoperative Instrument
Troubleshooting an Inoperative Instrument
When the instrument appears to be dead (no display and no fans), there
is often little evidence that points directly to the cause. This section
provides steps and solutions to typical failure modes relating to an
inoperative instrument.
Check the Instrument Setup
Before troubleshooting the instrument, ensure that it has been set up
correctly. Perform the steps in "Check the Basics" on page 23.
Initial Checks
Perform the following initial checks when first troubleshooting an
inoperative instrument.
1. Check the instrument display and fans.
a. If the display is dark and the fans are not running, suspect a
power supply or CPU problem. Refer to the "Power Supply Check"
on page 34.
b. If the display is dark but the fans are running, suspect either an
LCD problem, or a problem with the CPU boot sequence. Refer to
"Troubleshooting LCD Display Problems" on page 28.
c. If the display looks good but the fans are not running, refer to "If
the Fans Are Not Operating" on page 27.
2. If the instrument appears to abort the boot process, experiences a
failure during the self-diagnostic tests, or there is no response when
a front panel key is pressed, refer to "Check for Basic Functionality"
on page 31.
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