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4.23.3 MUX5(E) Fuses
On board fuses are provided for the +12V and +34V supplies.
If there is a fault on power-up or during operation, the status LED glows red.
If the Status LED is off, there is no communication with the MPU5 board. Check the +12V
fuse; if the fuse is serviceable switch the machine off and on and check that the power-up
sequence is obtained. If the sequence is not obtained, check that the +12V LED is lit on the
MPU6 board if not then the fault is likely to be the Power supply unit.
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