HP 8753E - Page 320

5. Press L24) Lxl] to count the frequency of the 2nd Lo signal.
. . . . . .
6- Press Ihnenu_) ~$ji!t~:~t~~~~ Lsoo] Ck/m.
Verify that the counter reading matches
the corresponding 2nd Lo value for the CW frequency. (Refer to ‘lhble 7-2.)
7. Verify the remaining CW frequencies, comparing the counter reading with
the value in Table 7-2:
n Press (FJ (i&i).
n Press (%GJ Irln_u.
8. Press L25_) Lxl] to count the frequency of the PLREF signai.
9. Press @J ~~~~~: L500) m. Verify that the counter reading matches
the corresponding PLREF value for the CW frequency. (Refer to ‘Pable 7-2.)
10. Verify the remaining CW frequencies, comparing the counter reading with
the value in ‘lhble 7-2:
n Press(TJ(l&iJ
n Press(sol(KiJiJ.
11. Check the results.
q If aII the counter readings match the frequencies listed in Table 7-2, skip
ahead to “A13/A14 Fractional-N Check”.
q If the counter readings are incorrect at the 500 kHz and 2 MHz settings
only, go to ‘TN LO at Al2 Check”.
q If aII the counter readings are incorrect at aII three CW frequencies, the
counter may be faulty. Perform the “OsciIIoscope Method” check of the
signals described below. (If the signais are good, either the A10 or Al4
assemblies could be faulty.)
7-14 Source Troubleshooting