08-20-2017, 02:53 PM
Five months later...and I once again have the 4230 up and running.
The right channel output transistors were blown by the transient apparently created when I accidentally turned the 4230 back on immediately after turninig it off back in March. In fact...two of the four literally blew apart. The other two in the right channel remained intact but shorted internally.
In addition, a few resistors in the output circuit were also taken out and these were also replaced.
This time, after replacing parts, I slowly brought it up on the Variac and it came right up with no trouble.
Before I consider putting it into service, though, I'm going to add a CL-80 or CL-90 inrush current limiter to try and prevent another episode of releasing the magic smoke.
The right channel output transistors were blown by the transient apparently created when I accidentally turned the 4230 back on immediately after turninig it off back in March. In fact...two of the four literally blew apart. The other two in the right channel remained intact but shorted internally.
In addition, a few resistors in the output circuit were also taken out and these were also replaced.
This time, after replacing parts, I slowly brought it up on the Variac and it came right up with no trouble.
Before I consider putting it into service, though, I'm going to add a CL-80 or CL-90 inrush current limiter to try and prevent another episode of releasing the magic smoke.
--
Ron Ramirez
Ferdinand IN
