Anritsu 682XXB - Manual (Page 189)

682XXB/683XXB MM 5-23
±15VLP Supply Problems
This supply provides ±15 volts to the Pulse Generator and the Refer-
ence, Coarse, Fine, and YIG Loop circuits.
Step 6. Perform the following procedure to isolate malfunctions to
the
±15VLP 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
±15VLP 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 A3, A4, A5, A6, and A7 PCBs.
f. Place the LINE switch to OPERATE and measure the
±15VLP voltages.
G If the voltages are correct, go to step g.
G 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.
h. Place the LINE switch to OPERATE and measure the
±15VLP voltages.
i. Continue steps g and h until the faulty PCB is located.
Table 5-6. Error Messages 105 and 106 (5 of 10)
TROUBLESHOOTING
TROUBLESHOOTING TABLES