Anritsu 682XXB, 683XXB 682XXB/683XXB MM 5-29, A3 Reference Loop

682XXB/683XXB MM 5-29
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,
replace 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
oscillator 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 50W).
If present, replace the A3 PCB.
If not present, replace the cable W110.
Table5-8. ErrorMessages 108, 109 and 110(1 of 2)
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