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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.
If the voltages are correct, the problem is cleared.
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.
If the voltages are correct, go to step j.
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.
If the voltages are correct, go to step j.
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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TROUBLESHOOTING TABLES