5-24 682XXB/683XXB MM±15VFM Supply Problems
This supply provides ±15 volts to the FM circuits.
Step 7. Perform the following procedure to isolate malfunctions to
the ±15VFM supply and its outlying load circuit.
a. Place the LINE switch to STANDBY.
b. Replace the A15 PCB assembly.
c. Place the LINE switch to OPERATE and measure the
±15VFM voltages per Table5-7.
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 A11 and A13 PCBs.
f. Place the LINE switch to OPERATE and measure the
15VFM voltages.
If the voltages are correct, go to step g.
If the voltages are still incorrect, contact your local
ANRITSU service center for assistance.
g. Place the LINE switch to STANDBY,then install on the
remove PCBs.
h. Placethe LINE switch to OPERATE and measure the
±15VFM voltages.
i. Continue steps g and h until the faulty PCB is located.
Table5-6. Error Messages 105 and 106 (6 of 10)
TROUBLESHOOTING
TROUBLESHOOTING TABLES