Audio Developments AD144 - Manual (Page 4)

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INTRODUCTION
Unpacking
If there are any signs of damage to the outside of the carton, please notify us or your
supplier immediately, regardless of the unit's apparent physical condition. This is in
case a claim has to be made at a later date because of previously undetected transit
damage. The packaging material should not be discarded until the mixer has been
acceptance tested and a suitable transit/storage case is available for secure, safe
storage.
Visual Inspection
Identification - please make a separate note of the serial number for your own capital
equipment records. Ensure that it agrees with the number on the invoice/packing
note. The serial number label is on the case exterior.
Configuration - check that the correct number and combination of input modules have
been installed. If, for any reason, you wish to change the positions of the modules, do
not do so until after completion of any acceptance tests. Any tests then made will be
to a known configuration and can be compared with our factory records.
Temperature - check the meter glasses for condensation. If the package has been in
transit during cold weather, leave the mixer for at least 12 hours to allow it to return to
normal room temperature. Any measurements or subjective tests then made, will be
to a known temperature reference.
Specific Points
Until the mixer has been acceptance tested we strongly recommend that modules are
not removed for adjustment. If adjustments are necessary, refer to the section on
adjustments and calibration. All customer functions are external, except the following.
Limiter threshold - is set at the factory at +8dBu (PPM 6), but an internal preset
potentiometer allows adjustment to any other level above 0dBu. The limiters are to be
found on the left-hand PCB of the output module. Presets are also available for
adjusting limiter attack and release times.
Line-up tone - at 1kHz and 10kHz is calibrated on the meters to PPM4, giving a line
output level of 0dBu with A, B, C, D faders set to maximum. NOTE - PPM4
refers to the mark on a BBC PPM Scale. Other meter scales have a different mark at
0dBu level. Alternative calibration levels are possible via the internal preset.
RH-output ident - as an alternative to continuous tone on all main outputs; B & D
outputs can be pulsed with tone for 3 seconds.