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Removal and Replacement Procedures
AM700 Audio Measurement Set Service Manual
6–75
CAUTION. The CRT can retain a high-voltage charge for a period of time after
operation of the instrument. Use a grounding probe to discharge the high-
voltage contact of the CRT before attempting to disconnect it.
9. Ground the lead of a grounding probe to the chassis of the AM700. Slide the
probe tip beneath the rubber insulation cup of the high-voltage lead on the
CRT. Hold the probe in contact with the high-voltage wire for 10 to
15 seconds, remove the probe tip, then reground the high-voltage wire with
the probe for 10 to 15 second more.
10. Use a pair of needle-nose pliers to release one side of the high-voltage
connector spring clip from the CRT. Use care not to break the CRT. Then
release the second side of the spring clip from the CRT.
11. Place the CRT face down in a protected area to prevent accidental breakage.
12. Disconnect the grounding lug from the rear chassis connector.
13. Disconnect J1 (from the power supply).
14. Remove the six T15 Posidrive screws holding the circuit board to the
chassis.
15. Tilt the board left side up to allow the board to clear the chassis edges and
lift the board out of the chassis.
Reverse the procedure to reinstall the Display Monitor board and the CRT.
1. Position the CRT so that the high-voltage lead may be reconnected to the
CRT. The connection belongs on the left side of the CRT when inserting the
CRT into the front-panel casting.
CAUTION. Reground the high-voltage lead and the CRT anode connector to
chassis ground for safety.
2. Reconnect the anode lead to the CRT. Hook one end of the spring clip in the
contact hole of the CRT. Use a pair of needle-nose pliers to compress the
spring to permit the other end of the spring connector to enter the contact
hole and release the spring. Make sure the anode connection is secure.
3. Align the four screw holes in the CRT mounting frame with the holes in the
front-panel casting and install the four T15 Posidrive screws to hold the CRT
in place. Leave all the screws loose until they are all in, then tighten each
snugly.
4. Reconnect all the connectors to the circuit board and the CRT socket to the
CRT. These are the deflection yoke connector, J4, the Trace Rotation yoke
connector, J7, the power supply connector, J1, and the ground lug connection