HP (Hewlett-Packard) HP 85660B ユーザーズマニュアル

Figure 5. 

 First Converter Replacement

3

For location of hardware and cables referred to in this procedure, see Figure 6.

1. Remove ac line cords, separate instrument sections, and remove top and bottom covers

from RF Section.

2. Remove five cables   from A6 PC boards; three from 

 and two from 

3. Remove RF Module PC board cover by removing six screws 

4. Remove 

 assembly and 

 

 and 

 PC boards.

5. Disconnect 4 (yellow) cable and 5 (green) cable from 2nd converter to release 

assembly.

6. Disconnect coaxial cable   between All YTO Loop and 

 ACLU at the ACLU.

7. Disconnect cable between 

 YTX and 

 ACLU at the YTX.

8. Disconnect cable between front-panel 

 LO OUTPUT connector and 

 ACLU at

the ACLU.

9. Disconnect 1 (brown) cable from 

 2nd Converter 

 OUT.

10. Disconnect cable between 

 Limiter and 

 RF Switch at the RF Switch.

11. Remove three screws   used to attach ACLU cover plate one at a time, removing cable

clamp and reinstalling the screws.

12. Disconnect wire harness connectors from ACLU and 2nd Converter to release wire harness

from the “totem pole” assembly.

10 A6