all the other configuration actions can be performed from the front panel or a control terminal after the installation is completed. information and detailed instructions for these operations appear in chapter 3 and chapter 4.
fcd-2 printed circuit boards
fcd-2 consists of two printed circuit boards (pcbs): the main board and the ltu board (see figure 2-1).
the main board contains most of the fcd-2 circuits and has several jumpers used to select various characteristics.
the ltu board contains the main link ltu circuit. the ltu is used only with the balanced interface, to extend the range on the twisted pair cable up to maximum of 33 db. it is not required when the unbalanced interface is used.
→ to set the fcd-2 internal jumpers:
1. open the fcd-2 case.
2. set the main board jumpers, referring to figure 2-1.
3. set the ltu board switch, referring to figure 2-1.
4. reinstall the fcd-2 cover.
access to the inside of the equipment is permitted only to the authorized and qualified personnel.
to avoid accidental electric shock, always disconnect the interface cables and the power cord before removing the unit from its casing.
line voltages are present inside fcd-2 when it is connected to power and/or to the lines. moreover, under certain fault conditions, dangerous voltages may appear on the lines connected to the unit.
any adjustment, maintenance and repair of the opened instrument under voltage should be avoided as much as possible and, when inevitable, should be carried out only by a skilled technician who is aware of the hazard involved.
capacitors inside the unit may still be charged even after the unit has been disconnected from its source of power.
fcd-2 contains components sensitive to electrostatic discharge (esd). to prevent esd damage, avoid touching the internal components, and before moving jumpers, touch the fcd-2 frame.
opening the fcd-2 case
to reach the internal jumpers and switches of fcd-2, it is necessary to open its case.
→ to open the fcd-2 case:
1. disconnect all the cables connected to fcd-2.
2. loosen the screw located at the rear panel of the unit.
3. slide out the top cover to gain access to the unit interior.
setting the internal jumpers and switches
the internal jumpers and switches located on the fcd-2 main board and ltu board are identified in figure 2-1. the functions of jumpers are described in table 2-1.
reinstalling the fcd-2 cover
after completing the internal settings, reinstall the top cover.
→ to reinstall the fcd-2 top cover:
1. slide the top cover along the grooves of the unit case.
2. secure the top cover by fastening the rear panel screw.