Troubleshooting, Troubleshooting tables – Anritsu 682XXB User Manual
Page 187
682XXB/683XXB MM
5-21
±15VG Supply Problems
This supply provides
±15 volts to the YIG Driver; SDM, SQM Driver;
CPU; and CPU I/O circuits andw the Switched Filter and Down Con-
verter assemblies.
Step 4.
Perform the following procedure to isolate malfunctions to
the
±15VG 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
±15VG voltages per Table 5-7.
G
If the voltages are correct, the problem is cleared.
G
If the voltages are incorrect, go to step d.
d.
Place the
LINE
switch to
STANDBY
.
e.
Remove the A13, A14, A16, and A17 PCBs as applicable
for your model.
f.
Place the
LINE
switch to
OPERATE
and measure the
±15VG voltages.
G
If the voltages are correct, go to step j.
G
If the voltages are still incorrect, go to step g.
g.
Place the
LINE
switch to
STANDBY.
h. Remove the switched filter and down converter assem-
blies.
i.
Place the
LINE
switch to
OPERATE
and measure the
±15VG voltages.
G
If the voltages are correct, go to step j.
G
If the voltages are still incorrect, contact your local
ANRITSU
service center for assistance.
j.
Place the
LINE
switch to
STANDBY
, then install one of
the removed PCBs/assemblies.
k. Place the
LINE
switch to
OPERATE
and measure the
±15VG voltages.
l.
Continue steps j and k until the faulty PCB/assembly is
located.
Table 5-6.
Error Messages 105 and 106 (3 of 10)
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