Maintenance
6–18
1720/1721
3. To install a bulb, hold it with the tweezers as described in step 2, position it
in front of the socket and push the bulb with your finger until it snaps into
place.
4. Replace the bezel.
1. Remove the bezel.
WARNING. The CRT may retain a dangerous charge. Ground the conductor of
the anode to discharge the CRT. Do not allow the conductor to touch your body
or any circuitry.
2. Slide a screwdriver with an insulated handle under the anode cap on the side
of the CRT, and ground the anode to the chassis, to discharge the CRT. DO
NOT touch the metal shaft of the screwdriver while doing this. Disconnect
the anode cap by prying it gently away from the CRT.
3. Disconnect J225 (trace rotation) on the Main board and push the connector
through the hole in the board.
WARNING. The crt is a high vacuum device and must be handled with care.
Safety glasses, gloves, and protective clothing should always be worn when
handling crts.
4. The CRT can now be pulled straight out (some pressure may be needed).
The CRT shield, along with the rubber manchet around its back, should
come out with the CRT.
1. If the CRT is to be replaced, remove the metal shield from the neck of the
old CRT and place it around the neck of the new CRT, with the WARNING
sticker towards the top of the instrument.. Ensure that the rubber manchet is
on the back edge of the shield.
2. Slip the CRT part way back into position and feed the trace rotation wires
(and plug) back through the hole in the Main board.
CRT Removal
Removal of the CRT
Replacement of the CRT
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