Studio Technologies 50 2000 - Manual (Page 31)

Model 50/51 User Guide Issue 4, July 2000
Studio Technologies, Inc. Page 31
Talent Amplifier Over Current LED
During normal operation the talent ampli-
fier Over Current LED should not light. It
will flash on and off if the talent amplifier
output is loaded to exceed its maximum
output current. The most common reason
for an over current condition would be a
shorted interconnecting cable. Also,
connecting more than the specified maxi-
mum of four Model 35 or Model 38 Talent
Amplifiers can also cause the LED to light.
Possible, but not likely, would be a fault
condition in a Model 35 or Model 38.
If the LED does light, troubleshooting
should prove quite simple. Begin by
disconnecting the cable that is plugged
into the talent amplifier output connector.
Perform the disconnection directly on the
Model 50’s back panel. The LED should
stop lighting. Now check through all the
wiring to determine where the short circuit
condition is located. The Model 50 will not
be damaged if the Over Current LED is
lighting so you should use it to help you
locate the fault in your system. In just a
few minutes you should be able to isolate
exactly what cable or talent amplifier is
causing the problem.
Control Console Over Current LED
During normal operation the control con-
sole Over Current LED should not be lit.
It will flash on and off if the power source
that supplies the Model 51 Control Con-
sole is loaded to exceed its maximum
output current. The most common reason
for an over current condition would be a
shorted 5-conductor MIDI-style intercon-
necting cable. A major fault in the Model
51 would also cause the LED to light.
If the LED does light, you should find
troubleshooting very easy. Begin by dis-
connecting the cable that is plugged into
the Control Console/MIDI In connector on
the Model 50’s back panel. The LED
should stop lighting. Reconnect the cable
to the Model 50 and disconnect the
cable’s other end from the Model 51. If the
LED still lights you have a bad cable. If the
LED does not light there is a problem with
the Model 51. Replace the cable if it
proves to be bad—remember you’ll need
a MIDI-style cable with all five conductors
connected. If the Model 51 appears to be
at fault it will need to be returned to the
factory for repair.
Input Data LEDs
The Model 50 Central Controller’s front
panel contains two LEDs that represent
incoming data. The Bus LED lights any
time valid MIDI-compatible data enters
the unit. The Model 50 LED lights only
when data is received that is valid for the
Model 50. The Model 50 uses MIDI sys-
tem-exclusive messages to perform all
operations. When the Model 51 Control
Console is connected to the Model 50,
both data LEDs will light any time the
Model 51 generates data. This is because
the Model 51 will only generate data that
is compatible with the Model 50.
If you are not using the Model 51, and
instead are supplying MIDI data using
another device, the LEDs should prove
extremely useful when troubleshooting.
Once the Model 50 is connected to a data
bus that is carrying MIDI data, the Bus
LED will light whenever any MIDI data is
received. Only when the MIDI data con-
forms to the Model 50’s MIDI system-
exclusive format will both the data LED’s
light. If the Bus LED lights, but the Model
50 LED does not, this indicates that the
data is not configured correctly for the