903-0628-00 Rev. 1
Model 903-HD User's Guide – FMB-X-2.5
Focal Technologies Corp.
Page 6-9
6.6 Model 903 Board Handling
The Model 903 includes several densely populated Printed Circuit Board Assemblies (PCBAs). Although
these boards are all conformally coated, care must still be taken while handling the boards to ensure the
PCBAs are kept clean and free from electrostatic discharge (ESD).
BOARD REMOVAL AND INSTALLATION
Ensure the system is powered down when removing or installing cards, as the system is not “hot
swappable”.
Model 903 boards are each held in place by two slotted screws through the front panel. Cards are held in
place within the rack by standard Eurocard card guides and 96-pin backplane connectors. The backplane
connectors have a strong mating force to ensure cards are held in place with significant vibration present.
To remove a board, completely undo the lower slotted screw from the chassis and loosen the upper holding
screw, leaving its threads partially engaged. Using the handle on the front panel, pull on the board slowly and
firmly until the backplane connector releases. The partially engaged screw will prevent the card from popping
out abruptly once the backplane connector disengages. Now undo the remaining screw and gently slide the
board straight out of the chassis, being careful not to flex the board or snag components on adjacent cards.
For HDB-TX cards, only remove the card far enough to reach and disconnect the ribbon cable
connector before fully extracting the card
. When handles are not available on the front panels, a
screwdriver may be used to carefully pry the panel away from the rack until the backplane connector
releases.
To install a card, insert the board in both the top and bottom card guides, then slowly push the card in to mate
it with the backplane connector. Tighten the top and bottom panel screws to hold the card in the chassis.
Connect the ribbon cable on an HDB-TX card before fully inserting the card
.
GENERAL HANDLING
Care must always be taken during the handling of PCBAs to ensure product integrity. The following guidelines
should be adhered to in working with PCBAs:
Always handle boards by the edges and do not touch any connectors or gold tabs.
Handle boards at an ESD safe workstation with a clean surface.
Never stack PCB assemblies on top of one another.
Special Considerations for FMB-X-2.5 Cards
The Model 903 fiber multiplexer boards (FMBs) have both electrical and optical components that require an
even greater amount of care during handling. Along with the points stated above, the following guidelines
should also be followed for the fiber multiplexer boards assemblies:
Ensure fibers are not crimped or moved away from their intended routes
If the assembly is set down, always place the boards bottom side down.
Ensure any disconnected optical connectors are cleaned immediately prior to reconnection.
Do not allow fiber bends with an equivalent loop radius less than 25 mm, even momentarily.
If internal fiber jumpers are used, ensure the card is removed only part way until the internal jumpers
can be disconnected before removing the card fully.
More information about fiber handling is provided in section 5.3 of this document.
Summary of Contents for Focal 903
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