682XXB/683XXB MM 5-51
Error 144 RF was Off when Selftest started. Some tests where
not performed
Description: Indicates that some self-tests where not performed be-
cause the RF Output was selected OFF on the front panel.
Step 1. Press the OUTPUT key on the front panel to turn the RF
Output ON.
Step 2. Run self-test again.
Table5-24. ErrorMessage 144
TROUBLESHOOTING
TROUBLESHOOTING TABLES
Error 145 AM Meter or associated circuitry failed
Description: Indicates a failure of the internal amplitude modulation
function. The 682XXB/683XXB may or may not provide amplitude
modulation of the RF output signal using modulating signals from an
external source.
Step 1. Set up the 682XXB/683XXB as follows:
a. Press SYSTEM , then Reset .
b. Press MODULATION, then AM to go to the Internal AM
Status display.
c. Press On/Off to turn internal amplitude modulation on.
Step 2. Using an oscilloscope, verify the presence of a 10 volt peak to
peak sine wave signal with a period of 100 ms at the rear
panel AM OUT connector.
If present, replace the A10 PCB.
If not present, replace the A8 PCB.
Table5-25. ErrorMessage 145