TROUBLESHOOTING

TROUBLESHOOTING

TABLES

Table 5-8.Error Messages 108, 109 and 110 (1 of 2)

A3 Reference Loop

Error 108 Crystal Oven Cold

Description: The oven of the 100 MHz crystal oscillator or the Option 16 high-stability 10 MHz crystal oscillator has not reached operating temperature.

Step 1. Allow a 30 minute warm up, then run self-test again.

If error 108 is not displayed, the problem is cleared.

If error 108 displays and Option 16 is not installed,

qreplace the A3 PCB.

If error 108 displays and Option 16 is installed, go to step 2.

Step 2. Disconnect the cable between Motherboard connector A20J4 and the Option 16 crystal oscillator assembly.

Step 3. Run self-test again.

If error 108 is not displayed, replace the Option 16 crystal

qoscillator assembly.

If error 108 is still displayed, replace the A3 PCB.

Error 109 The 100MHz Reference is not phase-locked to the

External Reference

Description: The reference loop is not phase-locked to the external 10 MHz reference.

Step 1. Using a coaxial cable with BNC connectors, connect the rear panel 10 MHz REF IN connector to the rear panel 10 MHz REF OUT connector.

Step 2. Disconnect the cable, W110, from A3J7.

Step 3. Using an oscilloscope, verify the presence of a 10 MHz signal at the end of the cable. The signal amplitude should be >0.5 volts peak-to-peak (into 50￿).

qIf present, replace the A3 PCB.

If not present, replace the cable W110.

682XXB/683XXB MM

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Anritsu 683XXB, 682XXB manual A3 Reference Loop, Error 108 Crystal Oven Cold

682XXB, 683XXB specifications

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