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

 YTX Replacement

I

For location of hardware and cables referred to in this procedure, see Figure 4.

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

from RF Section.

2. Disconnect cable 

 between All YTO Loop and RF Module.

3. Remove five cables from RF Module PC boards; three from 

 Phase Lock and two

from 

 YTX Driver.

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

5. Remove 

 assembly and 

 

 and 

 PC boards.

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

assembly.

7. Remove ribbon cable 

 between 

 YTX Current Driver and motherboard.

8. Disconnect 5-pin connector   from 

 and remove 

 by removing two screws 

The 

 YTX contains an extremely sensitive diode located inside the

LO/IF connector. This diode is highly susceptible to blow-out from static
discharge. Be very careful when handling the YTX to avoid damaging this
diode.

9. Disconnect all cables from 

 YTX.

10. Disconnect bus cable   from motherboard.

11. Remove two screws   holding YTX to motherboard.

12. Remove YTX from RF Module.

13. Place YTX in RF Module. Be sure insulator is properly installed between YTX and

motherboard.

14. Replace two screws   to attach YTX to motherboard.

15. Reconnect bus cable   to motherboard.

The 

 YTX contains an extremely sensitive diode located inside the

LO/IF connector. This diode is highly susceptible to blow-out from static
discharge. Be very careful when connecting cables to the YTX to avoid
damaging this diode. Ground (discharge) all cables before connecting them
the YTX.

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