5-38 682XXB/683XXB MM
If present, replace the A10 PCB.
If not present, replace the cable W122.
Error 143 Slope DAC Failed
Description: Error 143 indicates a problem with the level slope DAC
circuitry on the A10 PCB.
NOTE
When troubleshooting this error in a 682XXB model, begin
at step 3 of the procedure.
Step 1. Recalibrate the ALC slope. (Refer to chapter 4 for the cali-
bration procedure.)
Step 2. Run self-test.
If error 143 is not displayed, the problem is cleared.
If error 143 is still displayed, go to step 3.
Step 3. Replace the A10 PCB and run self-test again.
If error 143 is not displayed, the problem is cleared.
If error 143 is still displayed, go to step 4.
Step 4. Replace the A12 PCB and run self-test again.
If error 143 is not displayed, the problem is cleared.
If error 143 is still displayed, contact your local ANRITSU
service center for assistance.
Table5-17. ErrorMessages 121, 122, 123, 127, 142, and 143 (2 of 2)
TROUBLESHOOTING
TROUBLESHOOTING TABLES