Gilderfluke&Co Mp3-50 Audio & Show Controllers - Manual (Page 16)

output and you don’t see a LED, then the output is probably draw-
ing too much current and the output is ‘self protecting’. Discon-
nect the load and see if the LED now lights. If it does, then it defi-
nitely is an overload problem. If it does not, then try turning ‘on’
some of the other outputs. If they light OK, then the output driver
might be damaged. If they do not, then verify your addressing
and retest.
A Mp3-50 has eight optically isolated trigger inputs which can
be used to select, start and change the audio levels of the audio
half of the Mp3-50 player. These LEDs will light to show trigger in-
puts being sent into the audio half of the Mp3-50. The only out-
put channel on a Mp3-50/8, and the last output channel on a
Mp3-50/40 are shared with these audio trigger inputs. Normally
these are not used to trigger the audio on a Mp3-50/8 or Mp3-
50/40. The ‘hidden’ MPU trigger inputs from the Show Control half
of the Mp3-50/8 or Mp3-50/40 are normally used instead. This
leaves these eight outputs free to be used as outputs.
11) Fuses (1 LED on Mp3-50, 1 LED on Mp3-50/8, 5 LEDs on Mp3-
50/40) : The eight inputs of a Mp3-50 and the eight outputs of the
Mp3-50/8 or Mp3-50/40 make one, eight-bit wide ‘channel’. The
forty outputs of the Mp3-50/8 or Mp3-50/40 are divided into five,
eight-bit wide ‘channels’.
The eight inputs of a Mp3-50, eight outputs of a Mp3-50/8,
and last channel of a Mp3-50/40 are shared with the eight opti-
cally isolated inputs to the audio half of the Mp3-50/8 or Mp3-
50/40. This channel, and only this channel can be switched be-
tween using ‘internal’ and ‘external’ power using the switch on the
bottom of the unit. This will be lit when there is an external voltage
source present between pins #1 and #10 of the 1/4 J6 input,
when the switch is in the ‘external’ position. If the fuse LED is off for
this channel, check to make sure that this switch is not in the ‘ex-
ternal’ position if you are not feeding this channel an external
voltage source.
Each channel is fused for approximately one Amp of continu-
ous current. These LEDs light to show if the fuses are OK. If any are
out, then a short circuit (or too heavy of a load) is dragging the
outputs down and causing the fuse to open. The fuses are actual-
ly ‘PTC fuses’, which act more like circuit breakers. Once the over-
load is removed, they reset.
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