![]() I have some service documentation of the Helix series mixers (12, 17 and 24, so if you need more you can conatct me: frankdevries. (Not very efficient!) But as far as I can see, the FW voltage is not the problem here. This voltage is lowered to + 5 V by a resistor on the FW board and a 7805 regulator. It is specified as +12,2 V, but I measured 14 V. You could use a metal part of a jack as ground reference.įor the FireWire board an extra voltage supplied by the switched PSU is used. There are also two stereo channels for additional connectivity and two aux returns that can be utilized to further increase the number of inputs. If possible, first measure the voltages coming out of the power supply. Eight Mic/Line Inputs with Preamps The Helix Board 18 FireWire features eight Mic/Line inputs with preamps, phantom power, and six insert points for recording or live use. If for example the + or - 15 V is too low, clipping of the positive or negative parts of the waveform (dependng on which voltage is too low) will occur. 7 user reviews on Phonic Helix Board 18 FireWire. The Helix series mixers use mainly 4 supply voltages: + 15 V and - 15 V for the analog part (audio), + 5 V for the DSP and logic and +48 V only for the phantom power. One of the power supply voltages might be too low or even missing. It seems it is a power supply problem distorted sound, no meters, solo buttons not working, headphones low level and distorted.
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