5-18
690XXB/691XXB MM
±
15VA Supply Problems
This supply provides
±
15 volts to the PIN Control, ALC, and Analog In-
struction circuits and the Electronic Step Attenuator (if Option 2E or
2F is installed).
Step 5.
Perform the following procedure to isolate malfunctions to
the
±
15VA 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
±
15VA 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 A9, A10, and A12 PCBs and the electronic
step attenuator (if installed).
f.
Place the
LINE
switch to
OPERATE
and measure the
±
15VA 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/assemblies.
h. Place the
LINE
switch to
OPERATE
and measure the
±
15VA voltages.
i.
Continue steps g and h until the faulty PCB/assembly is
located.
Table 5-6.
Error Messages 105 and 106 (4 of 9)
TROUBLESHOOTING
TROUBLESHOOTING
TABLES
Summary of Contents for 680 C Series
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