60
Swapping Out a Control Panel
An EMX Surface control panel can be swapped out while the console
remains on-air since all program audio flows through the Mix Engine. The
only audio in the Surface is for the cue speakers and the headphone jack.
It should take less than five minutes to power down the Surface, swap out
a defective control panel, and repower the Surface.
If swapping out a Quad Fader panel, which has channels on it that are
feeding air, note the fader positions since you’ll need to match their
positions on the replacement panel to ensure there are no level changes
when the Surface is repowered.
To swap out an EMX Surface control panel:
1.
Use a 1/16” hex driver to remove four hex mounting screws.
2.
Unplug the 1620 power supply for the EMX Surface. If the Surface is
using redundant power, unplug both supplies. All lights should be off
on the EMX Surface.
3.
Use the encoder knobs, at the top of the control panel to lift up the
panel enough so it can be flipped over and the keyed ribbon cable,
which connects that control panel to the Host card, can be
unplugged.
4.
Hold the replacement control panel upside down next to its slot and
plug in the keyed ribbon cable.
5.
Set the control panel into place on the chassis rails and fasten the
four hex screws removed in step 1.
6.
If the Monitor Control panel was replaced pull the CR and HDPN
faders to full off. On a Quad Fader panel with live audio on its
channels, set the faders to the same positions as on the defective
panel so that when the Surface is powered up, and the fader
positions are read, the audio levels will not change appreciably.
7.
Plug in the power supply (or supplies) to power the EMX Surface.
The EMX Surface takes about two minutes to boot up. The same audio
sources, assignment button settings, and monitor selections as set on the
original panel will appear on the replacement panel. If the faders were set
as on the original panel, and the EMX console has continued playing on air,
there might be momentary audio level changes as the Surface retakes
control (especially if EQ or Dynamics are active since there will be a couple
seconds where the audio will be flat before the EQ and Dynamics settings
are re-applied).
Replacing the Headphone Jack
The board operator’s headphone jack can be serviced in the field. It
screws into a threaded hole in the lower chassis. A headphone cable
extends from that jack to a keyed 3-terminal Phoenix connector (CT21) on
the host board. The upper rear cover on the meter bridge will need to be
removed (#1 Phillips screws) to access that connector.
On an EMX Surface with one blank panel remove that panel (or the
accessory panel) and the Monitor Control panel to access the jack. The
Monitor Control panel will not need to be unplugged. Set some padded
material onto the last Quad Fader panel and set the Monitor Control panel
upside down on it while the headphone jack is replaced. On Surfaces with
five blank panels, remove the right-most two or three blank panels, or
accessory panels, to access the headphone jack.
Use an adjustable wrench to rotate the square plastic jack housing to
begin to loosen it then unscrew the jack by hand. Be sure to place shrink
tubing over the new jack’s solder joints to prevent shorting components
when an accessory panel is installed in the right-most accessory slot.
Mix Engine Status LEDs
If the red Error LED lights up on the front of the Mix Engine, it indicates
a fault in Mix Engine operation. Although audio may still be passing
through the Engine and there may be no other sign of trouble, the error
indicator is saying otherwise.
To clear the fault, try rebooting the Mix Engine using PR&E Navigator
(right-click on the Mix Engine icon in the System Dock and select Reboot
Blade). If the Mix Engine reboots and the Error LED turns off then the
issue was resolved.
If the Mix Engine reboots and the red Error LED is still lit then the Mix
Engine will have to be power cycled. Since this action will cut off all audio
through the Mix Engine while it is power cycled, the EMX console will have
to be bypassed if it’s on-air. Unplug the AC cord from the Mix Engine. Wait
a minimum of ten seconds to ensure power is fully removed from all
internal circuits, then plug the AC cord back in.
If the red Error LED is still lit after a power cycle it indicates there is a
serious circuit fault in the Mix Engine and it would need to be sent in to
Wheatstone for repair. See page 59 for contact information.
Ethernet Switch LEDs
Each RJ45 jack on the built-in Ethernet switch has two green LEDs. Both
blink rapidly for 1GB (Gigabit) speed devices (like the Mix Engine and
Razor Blade). One blinking green LED indicates the connected device is
operating at 100MB speed. The EMX Surface and many PCs use 100MB
NICs. Since each stereo audio stream uses about 5 MB of bandwidth, a
100MB NIC can still handle about 16 simultaneous audio streams.
Summary of Contents for EMX
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