Chapter 2 47
Overall 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 45.
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 Chapter 7 ,
“Troubleshooting the Processor, Power Supply, and Display,” on
page 145.
b. If the display is dark but the fans are running, suspect either a
display problem, or a problem with the CPU boot sequence. Refer
to "Isolating a Display Problem" on page 160.
c. If the display looks good but the fans are not running, refer to "If
the Fans Are Not Operating" on page 123.
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 "Troubleshooting Power-up
Problems" on page 46.
3. Instrument powers on but does not boot:
a. Refer to "Verifying the A26 CPU Assembly" on page 149.
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