Installation
8
Upgrading Bridge Firmware
The bridge firmware resides in PROMs on the motherboard. See Figure 3.
To swap out the firmware PROMs
1.
Remove the power cord and any cables from the AT-3675 front panel.
Opening the bridge without unplugging the power cord may expose personnel
to high voltage, risking the possibility of injury or death. See safety
statements starting on page i.
2.
Remove the three screws along the front edge of the top.
3.
Turn the bridge upside-down and loosen the top cover by removing the
three screws along each side and the three screws along the back.
4.
Remove the top cover by sliding it towards the back. If the cover fits
tightly, use a screwdriver to dislodge it.
The person handling the PROM(s) must be grounded to prevent electrostatic
discharge.
5.
Carefully remove PROM(s) with an IC puller or a flat screwdriver.
6.
Carefully reposition and reinstall the PROM(s). Check for bent pins or
misalignment between the PROM and socket.
7.
Reinstall the top cover and screws.
Figure 3: Location of the
PROMs on the AT-3675 Logic
Board
Warning
!
Caution
Front Panel of Bridge
Channel A LEDs
ODD
EVEN
B6
B7
B8
B8
B11
Transmit
Receive
