TROUBLESHOOTING

TROUBLESHOOTING

TABLES

Table 5-6.Error Messages 105 and 106 (9 of 10)

+24VH Supply Problems

This supply provides +24 volts for the YIG-tuned oscillator heater, the V/GHz circuit on the A12 PCB, and the coarse, fine, and YIG loop circuits. When the 682XXB/683XXB is switched to OPERATE, it also takes over the function of the 24VS supply and supplies +24 volts to the 100 MHz reference oscillator oven heater, the front panel LINE switch circuitry, and the optional 10 MHz high stability time base oven heater.

Step 10. Perform the following procedure to isolate malfunctions to the +24VH 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 +24VH voltage per Table 5-7.

qIf the voltage is correct, the problem is cleared.

If the voltage is incorrect, go to step d.

d.Place the LINE switch to STANDBY.

e.Remove the A4, A5, A7, and A12 PCBs and the YIG- tuned oscillator assembly.

f.Place the LINE switch to OPERATE and measure the +24VH voltage.

qIf the voltage is correct, go to step g.

If the voltage is still incorrect, contact your local

ANRITSU service center for assistance.

g.Place the LINE switch to STANDBY, then install one of the removed PCBs or the YIG-tuned oscillator assembly.

h.Place the LINE switch to OPERATE and measure the +24VH voltage.

i.Continue steps g and h until the faulty PCB/assembly is located.

682XXB/683XXB MM

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Anritsu 683XXB, 682XXB manual +24VH Supply Problems

682XXB, 683XXB specifications

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