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COURIER HIGH SPEED MODEMS
G-12 Additional Operations
2. Replace the modem in the case top: ease the voice/data
switch into the opening in the front panel and make sure the
back of the board rests on the locator pins at the rear (from
which you removed the screws).
3. Reconnect the modem's RS-232, power and phone cables, in
that order. Be sure the phone cable is plugged into the jack
closest to the center of the modemthe jack represented by
the wall jack icon on the case bottom label.
CAUTION: When you power on the modem there will be
potentially hazardous voltage, particularly near the phone
jacks. Do not touch the board when the power is on.
4. Power on the modem. Try MI/MIC closure again. Check
to see that the Off Hook (OH) status light goes on. If you
dialed a number, listen for an answer tone from the remote
modem. Then drop the DTR signal. The modem should go
on hook and the OH status light should go off.
5. If closure is not working properly, review the steps in this
section. Be sure the jumper switches are in the reverse
position of those in Figure G-1. If you still have problems,
there may be a problem with the phone cable. Or there may
be a problem with your hardware.
6. When the equipment is working correctly, disconnect the
modem’s RS-232, power and phone cables, and replace the
bottom of the modem case. Ease the two nibs near the front
corners into their openings in the front of the case top, guide
the rectangular slot over the volume switch, and ease the
back of the case bottom into place. Replace the two screws,
the two vinyl feet, and the volume slide-switch cover.