Line Filter; Isolation Transformer; Power Controller Board - Hologic QDR 4500 Technical Manual

Line Filter

To remove and replace either Line Filter, refer to Figure 5-15 and follow the procedure below:
1. Turn off the QDR 4500 computer and instrument power switches, and main power
circuit breaker. Unplug the power cord.
2. Remove the power module rear cover (4 Phillips screws).
3. Locate the Line Filter and remove 5 push-on spade connectors.
4. Remove the 4 nuts holding the Line Filter and remove it.
5. Reverse the steps to install the new Line Filter.

Isolation Transformer

To remove and replace the Isolation Transformer refer to Figure 5-15 and follow the procedure
below:
1. Turn off the QDR 4500 computer and instrument power switches, and main power
circuit breaker. Unplug the power cord.
2. Remove the power module rear cover (4 Phillips screws).
3. Locate the Isolation Transformer and unplug all cables.
4. Remove the 4 nuts holding the Isolation Transformer and remove the transformer.
5. Reverse the steps to install the new Isolation Transformer.

Power Controller Board

To remove and replace the Power Controller Board refer to Figure 5-16 and follow the procedure
below:
1. Turn off the QDR 4500 computer and instrument power switches, and main power
circuit breaker. Unplug the power cord.
2. Remove the power module rear cover (4 Phillips screws).
3. Remove the side control panel (8 Phillips screws).
4. Remove all connectors from the Power Controller Board.
Section 5 - Remove & Replace
5-29