Duration: 23:09

1,040 views

21

0:00 Self Test
1:19 Intro and update
2:43 what is it?
3:29 previous state
4:10 the symptoms
5:30 the problem
7:15 Component location and explanation
9:30 tests and diagnostics
13:35 the exact fault
14:34 the fix
16:11 receiver sensitivity test demo
20:00 transmitter test demo
21:35 final thoughts


Showing off a working Marconi 2955 communications monitor/radio test set after fixing the PLL.
Capacitor C108 on board AA3 failed short in my unit causing a high PLL control voltage yielding incorrect frequencies from the generator and no output on HF.