GE DigitalFlow DF968, Service Manual

Page: 48 / 78

Parts Replacement 4-5
March 2008
Installing an Option Card
The Model DF868 flowmeter can accommodate up to six option
cards. The option cards are installed into sockets on the rear of the
printed circuit board, and they are held in place with a metal bracket.
A single metal bracket is used to secure all the installed option cards.
Note:
If the Model DF868 presently has no option cards installed, be
sure to purchase the metal mounting bracket along with the
first option card.
To install an option card, refer to Figure 4-2 on page 4-11 and
complete the following steps:
1. Remove the printed circuit board, as described in a previous
section of this chapter.
2. If one or more option cards are already installed, remove the four
fasteners that secure the metal bracket to the printed circuit board.
Lift the metal bracket straight up and away from the printed circuit
board.
Note:
The fasteners may be either plastic snap rivets or metal
hardware (in some older meters). In either case, they may be
discarded, as new plastic snap rivets are provided.
3. There are six 32-pin option card sockets (
J41–J46
) on the rear of
the printed circuit board. To install an option card, insert its 32-pin
connector into any available option card socket and gently press
the card into place. Make sure that the pins in the connector are
straight and properly aligned with the socket and that the
connector is positioned on the right side of the option card.
Caution!
Do not force the option card into the socket. If the card
does not enter the socket easily, check for and straighten
any bent pins in the connector and try again.
4. Repeat step 3 to install any additional option cards.
5. Place the metal bracket over the option cards, making sure that all
option cards are aligned with the plastic card guides in the bracket.
Secure the metal bracket to the printed circuit board with the snap
rivets provided. See the installed assembly in Figure 4-1 on
page 4-10.
Complete the option card installation by proceeding to the Installing
the Printed Circuit Board (page 4-7) section of this chapter.