10
V.35 SYNC MODEM ELIMINATOR
3.1.2 O
PENING THE
T
OP OF THE
P
ORT
-B E
ND
This is a tricky procedure, so follow these instructions very carefully. Now that
you have the middle section open, find the DIP switch. It is mounted in plain
view on top of the V.35 SME’s insides, in one corner of one of the unit’s
circuit boards; refer to Figure 3-3 on the next page. If you hold the unit so
that this DIP switch is in the
lower left
corner of the exposed area, the housing
panel you need to remove is the
nearest
one to the Switch, the one to its
left
. If
you look closely, you will see that this panel partially obscures a copyright
notice printed on the DIP switch’s circuit board, as well as the edge of this
board (the jumpers you need to get at are on the unit’s main board, beyond
and below this edge).
Figure 3-2. Removing the top panel on the Port-B end.
To remove this panel, you need to unscrew and remove the two screws that
hold it on. These are at the very end of the unit: They are the top two screws
in Port B’s M/34 connector (one in the upper left corner, one in the upper
right—see Figure 3-2 below). Use a long, thin flathead screwdriver to back
these screws out one at a time. As you unscrew each screw, try to hold the unit
with the opposite side of Port B angled upward, so that when the associated
nut and lug washer come loose, they fall into your hand rather than into the
adjacent hole in the V.35 SME’s housing. (If any of the nuts or washers should
happen to fall into the unit, don’t panic; they can be shaken through to the