All channels are out, no mute LED on pushing any mute button, FX display responds to changing the coding knob and just phono input to output works but none of the 12 channels. I don't suppose anyone has the sequence of voltages for the main ribbon off the SM power supply?
I suspect its ridiculous "design" again. One of these annoyed me before. There is an overall BREAK switch that mutes all channels but not phono connectors CD in. But and a very big BUT , there is no LED associated with that button in the main section. Accidently press it and there is no evidence of it being pressed and you have a permanently "dead" system. Along with you naturally assume , on each channel, the LED would light on pressing the adjascent mute switch and otherwise light on overload, as legend says OL. But no , once again simple 1 pole latching switches and no LED reminder of any particular channel being muted. The LED is just what the label says , OL , and not a MUTE reminder at all. I thought Mackie was supposed to be a good name in htis sort of stuff. A pierced plastic shroud will be fitted over that crass killer button, so it cannot be activated accidently. If required then would need inserting a pen tip or something.
This silent killer button is right on the edge, mid-way up the right side , just where the ball of the right thumb would press , in normal carrying. In the troubleshooting section of the user manual, no mention of this crass failure mode. In the bit about the BREAK switch it does though say "Check this switch first if you are having trouble with no sound in the system"
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