Preregulator Circuit Board

To remove the Preregulator circuit board, perform the following steps:

1. Remove the High-Voltage shield (see the "HighVoltage Shield" removal procedure).

2. Remove two screws securing the Preregulator board mounting brackets (one at the rear-top of the frame and one on the right side near the back corner of the frame).

3. Remove the securing screw through the access hole of the clear plastic shield from the top of the Preregulator board at the front-right corner.

4. Disconnect four wire connectors from the Preregulator board and note their positions for reinstallation reference.

To reinstall the Preregulator board, perform the following steps:

NOTE

Check for sufficient silicon grease and proper positioning of the insulator in the plastic holder housing Q933.

5. Reconnect two wire connectors (P803 and P804) to the front edge of the Preregulator board at the positions noted in step 4. Then position the board into the instrument frame.

6. Reconnect two wire conncetors (P801 and P802) to the left edge of the Preregulator board at the positions noted in step 4.

7. Reinstall the securing screw at the top of the Preregulator board (removed in step 3).

8. Reinstall the two bracket screws (removed in step 2).

9. Reinstall the High-Voltage shield (see the "HighVoltage Shield" reinstallation procedure).

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