Komatsu 830E Shop Manual page 160

CARD REPLACEMENT
Some of the components on the cards are sensitive
to static electricity. To prevent damage, it is recom-
mended that a properly connected ground strap be
worn whenever removing, handling or installing a
card. After a card has been removed, it must be
carried and stored in a static proof bag or con-
tainer. Be certain control power is OFF before
removing a card.
NOTE: There are no adjustment potentiometers on the
control cards. Cards should not be removed during
troubleshooting unless it has been determined that a
card is at fault.
Removal
1. The FB cards are removed by first loosening the
two spring clips on the top of the hinged cover.
Swing the cover down to gain access to the
cards.
2. Each card is locked in place with a locking quick-
release lever at the top and bottom. Lift both
levers at the same time to release the locking
arrangement and move the card out of the socket
in the backplane.
3. Using both hands, grasp the card at the top and
bottom and pull gently. It will slide easily in its
guide strips to complete the removal.
4. Place the card in a static proof bag or container.
Installation
The cards are keyed to prevent them from inadvert-
ently being inserted into the wrong card slot.
1. To install a card, carefully insert it into its top and
bottom card slots. Slide the card into the panel
until the locking quick-release levers are close to
the panel edges.
2. Hold the levers and gently press the card further
into the panel, feeling the card and backplane
connectors start to engage. When the card is
inserted far enough for the locking levers to catch
on the panel edge, move both locking levers to
the locking position at the same time.
3. Swing the cover up and over the cards, latching
the two spring clips at the top.
E2-4
CARD REPAIR
FB cards in the FL275 panel are not field repairable.
Should one of the cards become inoperable, it should
be returned to the Komatsu Distributor under the GE
Unit Exchange Program.
Cards should be packed in a special shipping con-
tainer, designed specifically for shipping these cards.
Contact your Komatsu Distributor for instructions on
how to obtain these containers.
PANEL WIRING
The connectors for the FB cards, located on the end of
the card that plugs into the panel, each contain 210
pins.
The panel back, or backplane, has receptacles for the
card connectors, each having 210 pins to which wires
are wrapped, not soldered. The wrapping is done with
a special tool which wraps the wire tightly around the
pin. The pins are long enough to enable connecting
multiple wires. The panel backplane also has printed
circuits on it to facilitate inter-card circuit connections.
Electrical Propulsion Components 2/02 E02016