Northern Airborne Technology 247 - Manual (Page 9)

Model 247 Audio Mixing Amplifier
SM247 Installation and Operation Manual
Section 2 Rev: 1.00 Issue 2 Page 2-4
ENG-FORM: 805-0118.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
2.4.7 Post Installation Checks
2.4.7.1 Voltage/Resistance Checks
Do not attach the Model 247 until the following conditions are met.
Check the following:
a) Check pin <5> <10> <15> for +28 Vdc relative to ground.
b) Check pins <20> <25> and <30>
for ground (less than 0.5 Ω).
2.4.7.2 Power On Checks
Power up the aircraft’s systems and verify normal operation of all functions of the Model 247.
Upon satisfactory completion of all performance checks, make all required log book entries, electrical
load, weight and balance amendments and other documentation as required by your local regulatory
agency before releasing the aircraft for service.
2.5 Adjustments
The Model 247 cover must be removed to gain access to the internal adjustments shown in Figure 1
Internal Adjustments below. Refer to Assembly drawing 247-1 in the SM247 Maintenance manual.
To remove the Model 247 cover, remove the 2 screws in the top of the unit. Do not remove screws under
the base of the unit. Lift the cover to remove.
Reinstall the cover by following the same steps in reverse order. Tighten all screws securely but do not
over-tighten.
CAUTION
The Model 247 Series Audio Mixing Amplifier contains static sensitive
devices. Proper ESD handling procedures must be followed to prevent
damage to the unit.