Installation guide

Troubleshooting
Troubleshooting Assembly Level Problems
1-48
— If these signals are bad, carefully remove the A16 Frac-N (Option UNJ or Option 506) with
the power on.
a. Connect a semi-rigid cable-extender probe to P1 and connect a signal analyzer to the
probe; P1 delivers the YO input of the A16 Frac-N (Option UNJ or Option 506) through
W38.
To locate W38, 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.
b. 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).
(Refer to “A16 Frac-N (Option UNJ or Option 506)” on page 2-38.)
— If these signals are bad, replace the A21 YTO Driver (Option UNJ or Option 506)
(Refer to “A21 YTO Driver (Option UNJ or Option 506) and A22 Coupler (Option 506)”
on page 2-50.)
— If the connection is bad, replace the A19 Daughterboard.
(Refer to “A19 Daughterboard” on page 2-44.)
• If the -6 V supply is bad on the connector pins indicated:
a. Check the origin of the supply.
— If the supply voltage is good at the origin, replace the A23 Motherboard.
(Refer to “A23 Motherboard” on page 2-52.)
— If the supply voltage is bad at the origin, troubleshoot the problem using that assembly's
troubleshooting procedure.
705 F/2 Test
• Replace the A16 Frac-N (Option UNJ or Option 506).
Table 1-24
Options Tune
(MHz)
Check
(MHz)
Level
(dBm)
All 300 4800
± 300 > −10
All 500 8000
± 300 > −10
All 900 7200
± 300 > −10
502/503/504/506 1300 5200
± 300 > −10
503/504/506 2250 4500
± 300 > −10
503/504/506 3000 6000
± 300 > −10