Maintenance
1720/1721
6–19
WARNING. The CRT may retain a dangerous charge. Ground the the anode
connector to discharge the CRT. Do not allow the conductor to touch your body
or any circuitry.
3. Use a screwdriver to ground the anode connector on the CRT to the chassis.
4. Slide the CRT into the instrument, guiding the rubber manchet on the end of
the shield into the rear CRT support.
5. Align the socket on the A10 CRT Socket board with the pins and key on the
CRT. Gently push the CRT and the socket board together until the CRT pins
are fully seated in the socket.
6. Replace the trace rotation connector (J225, Main board), and snap the anode
lead onto the anode connector on the side of the CRT. (To ensure the correct
orientation of J225, the red lead is toward the front of the instrument.)
7. Wipe the faceplate of the CRT to remove fingerprints, then replace the bezel.
If the fit is too tight to allow the bezel to go into position, or if the CRT has a
loose fit after the bezel is completely tightened down, then the rear CRT
support must be repositioned.
To reposition the rear CRT support, loosen the two nuts that hold the support
in place. With the CRT and bezel in place, push the support towards the
front of the instrument until it is snug against the rubber manchet on the rear
of the CRT shield. Tighten the two support nuts.
8. Wipe off the faceplate of the crt to remove fingerprints.
9. Replace the bezel.
1. Remove the five rear screws. See Figure 6-4.
2. Unsolder the six bnc and one ground connection. (If 1700F10 Field Upgrade
is installed, unsolder leads from the battery connector.)
3. Pull the rear panel free from the chassis; be careful not to pull the unsoldered
wires.
4. To replace, reverse the procedure.
Removing the Rear Panel
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