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690XXB/691XXB MM
5-19
±
15VLP Supply Problems
This supply provides
±
15 volts to the Reference, Coarse, Fine, and YIG
Phase-Lock Loop circuits.
Step 6.
Perform the following procedure to isolate malfunctions to
the
±
15VLP supply and outlying load circuits.
a. Place the
LINE
switch to
STANDBY
.
b. Replace the A15 PCB assembly.
c.
Place the
LINE
switch to
OPERATE
and measure the
±
15VLP voltages per Table 5-7.
q
If the voltages are correct, the problem is cleared.
q
If the voltages are incorrect, go to step d.
d. Place the
LINE
switch to
STANDBY
.
e.
Remove the A3, A4, A5, and A7 PCBs.
f.
Place the
LINE
switch to
OPERATE
and measure the
±
15VLP voltages.
q
If the voltages are correct, go to step g.
q
If the voltages are still incorrect, contact your local
Anritsu service center for assistance.
g. Place the
LINE
switch to
STANDBY
, then install one of
the removed PCBs.
h. Place the
LINE
switch to
OPERATE
and measure the
±
15VLP voltages.
i.
Continue steps g and h until the faulty PCB is located.
Table 5-6.
Error Messages 105 and 106 (5 of 9)
TROUBLESHOOTING
TROUBLESHOOTING
TABLES
Summary of Contents for 680 C Series
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