Removal and Replacement
Maintenance
820
1. Have handy a screwdriver with a size T 15 Torx
R tip (Items 1 and 2).
2. Set the oscilloscope so its top is down on the work surface, with its front
facing you.
WARNING
To avoid injury: Use care when handling a monitor. If you break its
display tube it may implode, scattering glass fragments with high
velocity and possibly injuring you. Wear protective clothing,
including safety glasses (preferably a fullface shield). Avoid striking
the display tube with or against any object.
To avoid damaging the monitor: Store the monitor with its display
tube face down in a protected location, placing it on a soft,
nonabrasive surface to prevent scratching the face plate.
3. Take the precautions outlined in the WARNING above. Refer to Fig
ure 810 while doing the following steps.
4. Unplug the main board/power supply cable.
5. Remove the three T 15 Torx
R screws securing the monitor assembly to
the bottom ofthe main chassis. Rotate the oscilloscope so its bottom is
down on the work surface.
WARNING
To avoid injury or death, do not unplug the anode from the monitor
when removing or replacing the monitor module.
6. Remove the three T 15 Torx® screws securing the monitor assembly to
the top ofthe chassis. (See Figure 810 to locate the screws.)
7. Push up on the left top tab lock on the trim ring and pull the left corner of
the trim ring forward slightly.
8. Tilt the rear ofthe monitor assembly upward slightly. Slide the monitor
assembly back in the main chassis until it stops (about 2 cm). Now lift it
straight up out ofthe top ofthe main chassis to complete the removal.
9. While heeding the WARNING on monitor handling that immediately
precedes step 3 ofthis monitor removal procedure, store the monitor
assembly in a protected location. Place it face down on a soft, nonabra
sive surface to prevent scratching the face plate.
10. Reinstallation: perform steps 8 through 5 in reverse order to reinstall the
monitor assembly.
Monitor Assembly
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