
690XXB/691XXB MM
5-17
±
15VG Supply Problems
This supply provides
±
15 volts to the YIG, SDM, SQM Driver circuits;
and CPU I/O circuits; the YIG-tuned Oscillator, Switched Filter, and
Down Converter assemblies; the Electronic Step Attenuator (if Option
2E or 2F installed); and the 10MHz DDS circuits (if Option 22 is
installed).
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.
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 A13 (if installed), A14, and A16 PCBs.
f.
Place the
LINE
switch to
OPERATE
and measure the
±
15VG voltages.
q
If the voltages are correct, go to step j.
q
If the voltages are still incorrect, go to step g.
g. Place the
LINE
switch to
STANDBY.
h. Remove the electronic step attenuator (if installed) and
the YIG-tuned oscillator, switched filter, and down con-
verter assemblies.
i.
Place the
LINE
switch to
OPERATE
and measure the
±
15VG voltages.
q
If the voltages are correct, go to step j.
q
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 9)
TROUBLESHOOTING
TROUBLESHOOTING
TABLES
Summary of Contents for 680 C Series
Page 4: ......
Page 5: ......
Page 13: ...Figure 1 1 Typical Series 690XXB 691XXB Synthesized CW Signal Generator Model 69187B Shown ...
Page 61: ......
Page 97: ......
Page 205: ......
Page 207: ......
Page 221: ......
Page 225: ......
Page 241: ......
Page 259: ......
Page 275: ......
Page 285: ......
Page 289: ......
Page 299: ......
Page 303: ......
Page 315: ......