Agilent Technologies Infiniium 90000 A Service Manual page 76

Chapter 4: Troubleshooting
Front Panel Display Trouble Isolation
W A R N I N G
SHOCK HAZARD!
The backlight inverter assembly, which is mounted at the front corner of the oscilloscope near
the flat-panel display, operates at 1.65 kV at turn on. DO NOT handle this assembly while it is in
operation. An LED on the inverter board illuminates to indicate the presence of high voltage.
W A R N I N G INJURY CAN RESULT!
Once the cover is removed, the fan blades are exposed both inside and outside the chassis.
Disconnect the power cable before working around the fans. Use extreme caution in working
with the oscilloscope when the cover is removed. If the procedure allows, replace the cover over
the chassis (without screwing it back in place) before turning the oscilloscope on. If the
procedure requires you to have the cover off, be careful not to contact these fan blades with any
part of your body.
For information on how to replace the display parts, see "Replacing Assemblies," beginning on
page 89.
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