This Mackie SRM650 active speaker was dropped off yesterday, non functional as regards powering up.
Owner said power had previously been intermittent for a short while then non functioning.
Service manual is freely available online for the SRM series. Starting at the most obvious place, the SMPS board, disconnected everything else applied AC via the variac & current limiter & measured the outputs. Voltages measured correctly. SMPS was removed from the back plate and traces /soldering checked, no issues found.
Reconnected the amplifier board expecting it to shut down the power supply & everything started working & still is after 2 hours soak testing & two power restarts.
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