US Robotics COURIER - Page 172

-
-
I .-
-
-
COURIER HIGH SPEED MODEMS
4. Gently pry off the plastic volume slide-switch cover.
5. Raise the back end of the case bottom until it is at about a 60 °
angle; lift it away from inside the front of the modem. Put
the case bottom aside.
6.
7.
Locate the Voice/Data switch at the front of the modem. Lift
up and remove the modem (printed circuit board), carefully
easing the Voice/Data switch out of its opening in the front
panel.
Turn the modem rightside up and locate jumper switches J4
and J6, near the power-adaptor socket. Use Figure E-1 as a
guide .
• t
1 ...
- --- 1
EllJ6
J4Ell
STANDARD
Ml/MIC
WIRING
Figure E-1-Courier Modem Board
-J6.
J4-:
8. The jumpers are black shunts that cover two out of three
upright metal contacts. As shown in the figure, the modem
is shipped with the jumpers over the two contacts on each
switch that are closest to the front panel. The third contact
on each switch is exposed.
Lift off
the jumpers from J4 and J6. Reverse the positions
shown in Figure E-1. That is, on each switch, cover the
contact closest to the back of the modem and the contact at
the center. Make sure the jumpers cover two contacts on
each switch, or you'll disable the MI/MIC function.
9. Replace the modem in the case top: ease the Voice/Data
switch into the opening in the front panel and make sure the
Fax and Other Operations E-21