Gilderfluke&Co Sd-50 Audio & Show Controllers - Manual (Page 21)

7) ! Heart (Sd-50/0, Sd-50/8, Sd-50/40)
The ‘heartbeat’ will always flash so that you can see that the Sd-50/xx is alive. If this LED doesn’t flash
at least twice per second, you should power down the Sd-50/xx and check the power supply and connec-
tions to the Sd-50/xx. During flash memory downloads, this LED will flash alternately with the DMX/MIDI/
Serial LED at twice the normal heartbeat rate. During firmware upgrades, these two really go pitter-pat.
8) ! Left (Sd-50/0, Sd-50/8, Sd-50/40)
This LED flickers to give you a rough approximation of the audio being played out of the left side of the
audio player. It is downstream of the volume processing done on the Sd-50/0, and will dim to reflect
changes in
volume level . It is upstream of the Left Volume Control Pot . Changes in the Left Volume Control
Pot will not affect the output level of this LED.
9) ! Fuses (1 LED on Sd-50/8, 5 LEDs on Sd-50/40)
The eight inputs of a Sd-50/0 and the eight outputs of the Sd-50/8 or Sd-50/40 make one, eight-bit
wide ‘channel’. The forty outputs of the Sd-50/8 or Sd-50/40 are divided into five, eight-bit wide ‘channels’.
The eight inputs of a Sd-50/0, eight outputs of a Sd-50/8, and last channel of a Sd-50/40 are shared
with the eight optically isolated inputs to the audio half of the Sd-50/8 or Sd-50/40. This channel, and only
this channel can be switched between 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
‘
" J6 ’ input, when the switch is in the ‘external’ position. If the fuse LED is off for this channel, check to
confirm that this switch is not in the ‘external’ position if you are not feeding this channel an external voltage
source.
Each channel is fused for approximately one Amp of continuous 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 actually ‘Polyswitch fuses’, which act more like circuit break-
ers. Once the overload is removed, they reset.
10)! J8 ʻAʼ, ʻBʼ, ʻCʼ, & ʻDʼ Input LEDs (Sd-50/8, Sd-50/40)
These four LED will light to show current is flowing through the four ‘ J8 ’ Show Control Trigger inputs.
These LEDs are on the output side of the optoisolators, so if they are glowing, the microcontroller in the unit
should be seeing the signal. These four trigger inputs are the only way to use a switch closure input to start
the animated sequence playing on a Sd-50/8 or Sd-50/40. If not using the GPS, these LEDs will flash
slightly as the clock chip in the Sd-50/8 or Sd-50/40 is read.
11)! Output LEDs (8 LEDs on Sd-50/8, 40 LEDs on Sd-50/40)
These LEDs show the current status of the Show Control digital outputs . If a LED is lit, then that output
is ‘ON’. Because the outputs of a Sd-50/8 or Sd-50/40 are ‘Open Collector, Switch To Ground’, you can
ground out any output pin, and the appropriate LED will light. This can be useful when diagnosing output
wiring problems. If you are commanding ‘on’ an output and you don’t see a LED, then the output is proba-
bly drawing too much current and the output is ‘self protecting’. Disconnect the load and see whether the
LED now lights. If it does, then it definitely 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.
Gilderfluke & Co.• 205 South Flower Street • Burbank, California 91502 • 818/840-9484 • 800/776-5972 • fax 818/840-9485
Sd-50/xx Manual / October 29, 2012 2:29 PM / page 21 of 120