Quote:
Originally Posted by madmike17
Turns out, the truck is positive ground. with the transformer disconnected, I read 307 volts dc to ground.
|
Now that's with C34 still in-circuit, right? And you're getting 307V
positive to ground across C34?
Quote:
|
When I reconnected the circuit, the vibrator didnt even run.
|
Sounds like something's shorted out on the B+ line, like maybe filter cap C29. Did you replace it after it 'spilled its guts' from reversed polarity?
Quote:
|
After a lot of fooling around with it it finally began to run. Unfortunately, the radio does not work. A hum the same frequency as the vibrator came through the speaker, but nothing else. As i turned the tuning cap, there were crackles and pops from the cap itself. It sounded like high voltage arcing between the plates. Should the rotors have hv on them?
|
The tuning cap shouldn't have any signifigant voltage on it, maybe just a few volts max.
Quote:
|
I know the stator is directly connected to ground.
|
Normally the tuning cap rotors are at ground and the stators are the 'hot' side of the cap (unless you've a got a very unusual style of tuning cap).
Quote:
|
The vibrator really didnt want to start, I had to tap on it and shake it to make it start. I think I am in over my head. Now what?
|
You might try disconnecting what you did before, leaving just C34 in-circuit, and see if the vib will start up easily. If so, it suggests a heavy short in something 'downstream' (like in C29) lugging the supply down and stalling the vib.