No power in Mackie TH-15A
The Mackie 1202 mixer I connected to my Mackie TH-15a had a live mic connected to it that caused a brief, but loud feedback loop when I turned on the power. Now the TH15a is dead and the green power LED is out. Unfortunately the fuse is fine, both visibly and via a continuity meter. How could feedback blow the power supply and how would I go about replacing it?
Music - Mackie - TH-15A Active DJ Powered THUMP Speaker Stand and Cable Set...
Answers & Comments
I) I assume the fuse you mentioned was in the mains plug - did you also check the fuse in the TH15A mains input socket? This is accessed by pulling out the tab in the bottom section of the socket (below the centre pin). This is a 3.15Amp antisurge fuse, 20mm type.
ii) If this fuse has blown, then replace it & all may be well ...... but if it blows again, then move to step iii).
iii) With mains disconnected, remove rear panel (outer screws) & check the power supply PCB for damaged components, especially R111 & R112 (100ohms). If the latter are burnt or open circuited, then the amplifier module may have blown.
regards, Dave