Allen&Heath ML5000 USER GUIDE - Manual (Page 27)

ML5000 User Guide 27
D3 SAFE / EDIT. This green LED has a different
function according to console operating mode:
Normal The LED lights when the channel has
been made safe from the snapshot and MIDI
automation.
Solo-in-Place The LED lights when the channel
has been made safe from solo-in-place.
Edit Safes Indicates that the channel is safe from
the automation when entered from normal mode, or
safe from solo-in-place when entered from SIP.
Edit Groups The LED lights to indicate that the
channel is assigned to the group.
Preview Snapshots The LED lights to indicate
that the channel is muted in the snapshot memory
being previewed.
D4 PAFL. Press this switch to listen to the
channel signal in the headphones or engineers
monitor without affecting the main outputs.
Either PFL or stereo in-place AFL. Either PFL
(pre-fade listen) or AFL (after-fade listen) is
selected according to the master section INPUT
PAFL switch P2 . AFL is ‘in-place’ as it provides a
stereo mix of L and R with C mixed into both. This
lets you listen to the image of the signal in the 3
output main mix using the console stereo
headphones and monitor.
Latching or momentary action. The switch
provides latching or momentary action depending
on how long it is held down. Press and hold for
longer than 1 second for momentary action.
PAFL override monitor. Pressing any input PAFL
automatically overrides any currently selected
output AFL or monitor source. Releasing PAFL
restores that selection.
Auto cancel or Add mode. The master section
ADD MODE switch P1 determines if pressing a
channel PAFL cancels or adds to any previous
selection.
Clear all. Pressing the master section CLEAR ALL
switch P3 turns off any PAFL / AFL switches
selected and restores the monitor source.
D5 INPUT METER. The 5 LED bar meter
displays the pre-fade signal level. SIG lights to
display signal presence at –26dB, -6, 0 and +6
display normal signal level, and PK (peak) lights
when the signal is within 5dB of clipping. PK
senses the signal at 4 critical stages in the signal
path, pre-insert, pre-EQ, pre-fader and post-fader,
to warn of potential overload. PK can flash, for
example, if the preamp is clipping while signal reads
low due to attenuation through an inserted
processor.
D6 VCA GROUP Indicators. These LEDs light
to show which VCA groups the channel is assigned
to. The channel can be assigned to more than one
group. The channel is assigned or removed from a
group using the EDIT GROUPS function in the VCA
master section K . The LEDs function according to
console operating mode:
Normal The LEDs display the current VCA group
assignments.
Preview Snapshots The LEDs display the VCA
group assignments in the snapshot memory being
previewed.
D7 FADER. A 100mm smooth travel K-fader is
fitted providing +10dB gain above the nominal 0dB
operating position. Audio is not passed through the
fader. Instead, its position is read by the console
computer which produces a DC voltage to control
the level of the channel VCA (voltage controlled
amplifier).
Removing the Fader
The vertical, offset shaft design of the fader reduces
the risk of damage through dust and liquid spillage.
The fader should provide long life subject to the
usual wear and tear and not normally require
servicing or replacement. If necessary, access to
the faders is by removal of the fader module from
the top of the console. First unclip and lift away the
plastic ident strip. Undo the fader panel crosshead
screws and lift the module up being careful not to
damage the circuit assemblies and cables. The
fader can be unscrewed, its harness unplugged,
and then removed by sliding it out of the assembly.
Checking the Channel Signal Level
When plugging in a new source start with the
channel muted or fader and sends turned down.
Adjust the GAIN control A2 for an average
channel meter reading of ‘0’ with loud moments
lighting ‘+6’. Select PAD A3 if the signal is still too
high with gain turned down. Reduce the gain if the
red PK LED D5 lights. It may be necessary to re-
adjust the gain if changes are made to the equaliser
or inserted signal processing. If the PK LED lights
with channel meter reading low then check the
channel for correct gain structure, in particular the
equaliser and inserted equipment settings.
Set the master INPUT PAFL switch P2 for PFL
and select the channel PAFL D4 to check the
signal quality in the headphones. The signal is also
displayed on the main VU and LED bar meters
providing finer resolution and dynamic display.