Acom 03AT Operating Manual page 7

Fig.2-1. Remote AATU unit on-mast installation and cables arrangement (bottom view).
c) Using a 5mm (0,2") Allan key unscrew all 10 captive screws М6 located on the bottom panel of the unit (see fig.2-
1,d). Pull the metal hood upwards carefully and remove it. Using a "Philips 1" screwdriver, unscrew all 12 М3х8mm
screws that hold the rear lid of the unit. Carefully slip it off in order to get access to the Printed Circuit Boards "Power
Supply" and "Control". On the "Control" PCB find the two optic devices, marked U10 and U11 on the PCB, and
having knurled plastic nuts, permanently installed on their optic connectors (a split-socket type to tighten the optic-
cable cores) - see fig.2-2,a & 2-3. The black-case device is the photo detector receiver while the white-case is the
optic emitter. For now, as the other cable end is still not connected, it is meaningless which core to which device
shall be connected. Identifying is easy on the second end at the first power on see S.2-4(c).
Fig.2-2. Remote unit connections
d) Unscrew the plastic cable-gland cap (marked "OPTOLINK CONTROL" on the bottom panel - fig.2-1,e & 2-2,e) and
thread it over the optic cable in such a direction as to be able to screw it onto the same cable gland later. Push the
bared optic cable end into the cable-gland hole and direct it to both optic-device apertures (fig.2-2,a-b & 2-3).
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