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©2000 Crown International, Inc.
IQ-USM 810 Service Manual
4-10 Maintenance
130447-1 Rev. A
will cause the IQ-USM 810 to automatically reboot. If
the top cover is off the unit, switch S1 on the System
Controller board (the long board with the rear panel
DB9F and DB37M connectors) will reboot the unit. The
LED located next to the switch is lit when the unit is not
in reset.
Q. I notice there is a switch on the SHARC board. What is it
for?
A. The switch on the SHARC board resets the SHARC
processors independently of the System Controller. The
problem with using this switch to reset the SHARC pro-
cessors is they need the System Controller to reboot
them. In practice, the SHARC board reset switch is not
used. The LED by the switch lights when the SHARC's
are not in reset. Reset is controlled by the System Con-
troller. If a reboot of the SHARC's is required, use the
System Controller reset switch to reset the entire IQ-
USM 810 and reboot the SHARC's.
Q. I plug in the IQ-USM 810 and nothing happens. What's
the matter?
A. First, ensure that AC power is indeed being applied
to the unit. Next, take the cover off the unit and see if
any of the LED's on the System Controller or SHARC
boards are lit. If so, check the cable between the Sys-
tem Controller board and Front Display board. If no
LED's are lit, check the cable between the power sup-
ply (located under the System Controller board) and
the System Controller. If that seems OK, check the power
supply by removing the System Controller. A fuse is lo-
cated on the power supply board. Replace ONLY with
the same type fuse.
Q. What is preset “P00?”
A. Preset P00 is a factory default preset that allows the
IQ-USM 810 to be placed into a known, safe state. In
P00, all faders are at minimum and all filters, gates,
delays, etc. are off. It is a good place to start when start-
ing to configure a unit or if you need to get back to a
known starting point.
Q. What is the purpose of the “Infinity Pattern” on the front
panel?
A. The Infinity pattern is also referred to as a “test” pat-
tern. It’s serves no real purpose other than to provide
an attractive display when front panel level or gate sta-
tus indication is not desired.
Q. How should I set the baud rate on the IQ-USM 810?
A. The baud rate for the RS232 interface is adjustable
and is accessed by the front panel (see the Reference
Manual for information on settng the baud rate). In prac-
tice, you should try to run at as a fast a rate as you can
without problems. Some computers have difficulties
keeping up at 115 k baud. If you notice the IQ-USM
810 dropping off-line occasionally, try a slower baud
rate. The IQ for Windows software automatically adjusts
to the selected baud rate of the IQ-USM 810 during
initialization, so no setup of the software is required.
Q. Why don't I have a control to set the baud rate of the IQ
loop?
A. The IQ loop's baud rate is fixed at 38.4 k baud and
is not adjustable.
Q. What voltage should I use to wire analog control pots to
the IQ-USM 810's Control Port?
A. The IQ-USM 810 needs a 0 to +10V voltage to utilize
the full range of the Control Port's analog inputs. +10VDC
is provided on the Control Port connector for this pur-
pose. If you want the remote pot to control only a por-
tion of the fader range, use the IQ for Windows software
to tailor the range desired. In general, the Control Port
pots should be wired between GND and +10VDC.