682XXB/683XXB MM 5-15
TROUBLESHOOTING
TROUBLESHOOTING TABLES
If the signals are present and correct, go to step 8.
If the signals are not present or are incorrect, replace the
A6 PCB.
Step 8. Disconnect the cable, W123, from J7 of the Pulsed Switched
Filter assembly.
Step 9. Using the oscilloscope, verify the presence of a pulse train
with an output level of +2 volts to –2 volts, a pulse period of
1 ms, and a pulse width of 200 ms at the end of the cable,
W123.
If present, replace the Pulse Switched Filter assembly.
If not present, replace the cable W123.
Table5-4. MalfunctionsNot Displaying an Error Message (4 of 6)