I tried it with another source unit and it's still the same, it also damaged the unit which no longer produces clear audio, I suspect it's blown an op amp - I'll fix that later.
Check the shield ground continuity to the case for the head unit.
Start a new thread if you need help with it.
1507:
Do you read 0 ohms between any of the output transistors or rectifiers and the heatsink?
Have you removed it from the heatsink yet (don't, if you haven't).
Start a new thread if you need help with it.
1507:
Do you read 0 ohms between any of the output transistors or rectifiers and the heatsink?
Have you removed it from the heatsink yet (don't, if you haven't).
Q820 Centre leg is 0 ohms between the heat sink,
I removed the securing screw and lifted Q820 off the heat sink and powered up the amp,
With the multimeter red probe on B+ and black probe on the rca shield it now reads 11.93v DC
I tested for audio and its working again.
I'll see if I have a spare insulator to place between Q820 and the heatsink hopefully it should do the trick.
Thank you Perry for your invaluable assistance in locating the issue.
I removed the securing screw and lifted Q820 off the heat sink and powered up the amp,
With the multimeter red probe on B+ and black probe on the rca shield it now reads 11.93v DC
I tested for audio and its working again.
I'll see if I have a spare insulator to place between Q820 and the heatsink hopefully it should do the trick.
Thank you Perry for your invaluable assistance in locating the issue.
In the future, measure the shield voltage with the black on the primary ground and the red on the RCA shields. The voltage should be very near 0v. Using the B+ terminal doesn't tell you much in most cases.