
690XXB/691XXB MM
5-33
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 690XXB 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.
q
If error 143 is not displayed, the problem is cleared.
q
If error 143 is still displayed, go to step 3.
Step 3.
Replace the A10 PCB and run self-test again.
q
If error 143 is not displayed, the problem is cleared.
q
If error 143 is still displayed, go to step 4.
Step 4.
Replace the A12 PCB and run self-test again.
q
If error 143 is not displayed, the problem is cleared.
q
If error 143 is still displayed, contact your local Anritsu
service center for assistance.
Table 5-17.
Error Messages 121, 122, 123, 127, 142, and 143 (2 of 2)
TROUBLESHOOTING
TROUBLESHOOTING
TABLES
Summary of Contents for 680 C Series
Page 4: ......
Page 5: ......
Page 13: ...Figure 1 1 Typical Series 690XXB 691XXB Synthesized CW Signal Generator Model 69187B Shown ...
Page 61: ......
Page 97: ......
Page 205: ......
Page 207: ......
Page 221: ......
Page 225: ......
Page 241: ......
Page 259: ......
Page 275: ......
Page 285: ......
Page 289: ......
Page 299: ......
Page 303: ......
Page 315: ......