Installation guide

Troubleshooting
Troubleshooting Assembly Level Problems
1-47
— If the supply voltage is bad at the origin, troubleshoot the problem using that assembly's
troubleshooting procedure.
703 Output Voltage
• Replace the A16 Frac-N (Option UNJ or Option 506).
704 Filter Test
• If the -6 V supply is good on the connector pins indicated:
a. Turn power off to the signal generator.
b. Remove the A16 Frac-N (Option UNJ or Option 506) and ohm the connection between the appropriate
J42 and J10 pins.
— If the connection is good:
a. Re-insert the A16 Frac-N (Option UNJ or Option 506).
b. Remove the A13 Output (Option 501, 502, 503, 504 or Option UNJ).
c. Turn power on to the signal generator.
d. Connect a semi-rigid cable-extender probe to P4 and connect a signal analyzer to the probe; P4
delivers the RF output of the A16 Frac-N (Option UNJ or Option 506) through W41.
To locate W41, refer to “Option UNJ - Semi-Rigid Cables includes the A21 YTO Driver (Option
UNJ or Option 506) and the AT1 Electronic Attenuator (Option 501, 502, 503, 504 or
Option UNJ) or the AT1 High-Power Mechanical Attenuator (Option UNB) with A28 Reverse
Power Protection (Option 501, 502, 503, 504 or Option UNJ)” on page 3-46.
e. Tune the signal generator to the following frequencies and check for the presence of a signal:
— If these signals are good, replace the A16 Frac-N (Option UNJ or Option 506).
Table 1-23
Options Tune
(MHz)
Check
(MHz)
Level
(dBm)
All 300 300
± 10 > +5
All 500 500
± 10 > +5
All 900 900
± 10 > +5
502/503/504/506 1300 1300
± 10 > +5
503/504/506 2250 2250
± 10 > +5
503/504/506 3000 3000
± 10 > +5