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TM 11-6625-3145-14
Maintenance: General Information-318/338 Service
Removing the CRT Circuit Board
1.
Remove the cabinet (see Removing the Cabinet).
WARNING
The CRT anode and the output terminal of the high-voltage multiplier may retain a
high-voltage charge after the instrument is turned off. To avoid electrical shock,
ground both the output terminal of the multiplier and the CRT high-voltage anode
lead to chassis ground before disconnecting the high-voltage lead.
2.
Ground the CRT high-voltage lead to chassis ground, then disconnect the high-voltage lead from the CRT by
squeezing the spring clip in the connector and pulling it outward.
3.
Loosen the high-voltage lead from any tight places on the chassis so that it will permit removal of the CRT circuit
board.
4.
On the CRT circuit board, disconnect P040, P001 and P100, noting their location.
5.
Remove the three screws that secure the board to the chassis.
6.
Carefully remove the CRT circuit board from the chassis.
7.
To reinstall the CRT circuit board, position it into place on the chassis and secure it with the three retaining screws.
8.
Reconnect P040, P001, and P100 while observing correct arrow alignment.
9.
Reroute the high-voltage lead and connect it to the CRT.
10.
Reinstall the cabinet.
Removing the Cathode-Ray Tube (CRT)
WARNING
Use care when handling a CRT. Protective clothing and safety glasses should be
worn. A void striking it on any object which might cause it to crack or implode.
When storing a CRT, place it in a protective carton or set it face down on a smooth
surface in a protected location with a soft mat under the faceplate to protect it from
scratches.
1.
Remove the cabinet (see Removing the Cabinet).
WARNING
The CRT anode and the output terminal of the high-voltage multiplier may retain a
high-voltage charge after the instrument is turned off. To avoid electrical shock,
ground both the output terminal of the multiplier and the CRT high-voltage anode
lead to chassis ground before disconnecting the high-voltage lead.
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Summary of Contents for 318
Page 119: ...318 VERIFICATION AND ADJUSTMENT PROCEDURES ...
Page 182: ...338 VERIFICATION AND ADJUSTMENT PROCEDURES ...
Page 253: ...318 ___________________ TROUBLESHOOTING TREES ...
Page 344: ...338 TROUBLESHOOTING TREES ...
Page 517: ...TM 11 6625 3145 14 318 338 4434 923 318 Block Diagram ...
Page 518: ...TM 11 6625 3145 14 318 338 4434 924 338 Block Diagram ...
Page 519: ...TM 11 6625 3145 14 318 338 4434 925 318 Acquisition Module Wiring Diagram ...
Page 520: ...TM 11 6625 3145 14 318 338 4434 926 318 338 Mainframe Wiring Diagram ...
Page 521: ...TM 11 6625 3145 14 318 338 4434 926 338 Acquisition Module Wiring Diagram ...
Page 522: ...TM 11 6625 3145 14 318 338 4434 928 Figure 9 1 318 A01 Input A Board Component Locations ...
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Page 528: ...TM 11 6625 3145 14 Figure 9 3 318 338 A03 ACQ Control Board Component Locations ...
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Page 542: ...TM 11 6625 3145 14 Figure 9 8 318 338 A10 CRT Board Component Locations ...
Page 544: ...TM 11 6625 3145 14 Figure 9 9 318 338 A11 Inverter Board component Locations ...
Page 546: ...TM 11 6625 3145 14 Figure 9 10 318 338 A12 Regulator Board Component Locations ...
Page 551: ...TM 11 6625 3145 14 Figure 9 12 338 A01 Input A Board Component Locations ...
Page 553: ...TM 11 6625 3145 14 318 338 SERVICE ...
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Page 555: ...PIN 058584 ...