DataKinetics DSC110 User Manual page 162

The end plate retaining screw should be removed and the faulty board withdrawn.
The replacement should then be unpacked and inserted in the unit, and the two
ribbon cable headers reconnected to the board in the same positions that they
were removed from the faulty card. The Alarm Port connector should be re-
connected to the rear of the unit.
8.3.7 Replacement of Ethernet Card
The Ethernet card is fitted in board position 2.
Before the faulty board is removed, the Ethernet connector should be unplugged
from the rear of the unit.
The end plate retaining screw should be removed and the faulty board withdrawn.
The replacement should then be unpacked and inserted in the unit, The Ethernet
connector should be re-connected to the rear of the unit.
8.3.8 Fan Replacement
The fans are bolted to a fan tray which can be easily removed from the chassis to
allow replacement of a faulty fan. The fan tray is fixed by three countersunk
screws accessed from the underside of the chassis and two pan head screws
fixing to the top card guide support bracket (containing board position numbering
legend).
After removing these screws, the fan tray can be lifted upwards until the bottom of
the tray is clear of the power supply unit (PSU). At this point the Power Fail alarm
connector (grey/black cable) and the fan supply connector (orange/black cable)
should be unplugged from the small circuit board located beneath Fan 2. The
ribbon cable connected to this circuit board is an integral part of the circuit board
and has to be removed from the lower connector on the back edge of the alarm
card using the ejectors. It may be necessary to withdraw the alarm card from the
chassis to gain access to this connector. Once the ribbon cable is free, it should
be drawn back through the card guide support assembly and the fan tray
completely removed from the chassis.
Each fan can be removed from the fan tray by removing the four corner nuts and
bolts; this also frees the fan finger guards. Each fan has a supply and alarm
connector which can be unplugged from the IFC assembly. The lower fixing bolts
of Fan 2 also secure the IFC assembly fixing bracket.
The bottom two bolts fixing Fan 1 and Fan 2 together with the bottom left hand
bolt fixing Fan 3 are shorter than the other fan fixing bolts; they should not be
mixed on re-assembly. Each fan should be connected to the IFC assembly, the
wire tidied and cable tied as necessary before the fan tray is refitted to the
chassis.
Re-fitting the fan tray is the reverse of the removal procedure. Remember to
connect the Power Fail and Fan Supply connectors as the tray is lowered into
position.
8.3.9 PSU replacement
The PSU is located at the front of the unit and is fixed by four screws from the
underside of the chassis.
DataKinetics DSC110 / DSC210 User Manual Issue 12 Page 162