Technical data

84 4000 X-Series Oscilloscopes Service Guide
4 Troubleshooting
fan power cable connected as shown in the following
figure.
Figure 14 Setup for troubleshooting internal assemblies
Other advice:
• Place the front deck in a cover or rest it on a cloth to
prevent scuffing the front panel knobs.
• Because of the short length of the interboard supply
cable, elevate the rear deck to prevent strain on the
cable.
6 Make sure the keyboard cable, display cable, display
backlight power cable, and all other cables except the fan
power cable are properly connected.
CAUTION
MAKE SURE EARTH GROUND IS MAINTAINED FOR THE FRONT DECK !
For example, connect a cable with alligator clips between the rear deck chassis
and the front deck chassis, or connect a BNC cable from one of the BNCs on the
system board to a known grounded BNC on your workbench.