Specifications

Troubleshooting and Repair Procedures
194 025-9035AA
Other Checks
If you are not making connection, and you have some kind of switch on the telephone line
to the terminal, for instance to switch between a desk telephone and the terminal, make
sure it is in the correct position.
Also, make sure there are not other devices on the line, for example FAX machines, other
modems, computers, terminals, desk phones someone might pick up when they hear it
ringing, etc.
If you are not sure where the problem lies, let us call the terminal with our modem. If we
can connect to it successfully, this will at least tell us that the problem is not in the
terminal.
Machine/Environment
PC-compatible computers, peripherals, and environments can vary widely.
Incompatibilities can affect everything from not being able to link up at all, to occasional
intermittent problems. You should review these items:
Hardware
• CPU SPEED
We have encountered a few problems with machines running at their higher speed
clock rates.
• BOARDS
Plug-in boards, such as multi-function or expansion boards, can cause problems
with conflicting interrupts or addresses. For instance, there may be a hidden COM
port on a board. Check all of your documentation for each board - if it mentions
COM ports, find out how to disable any you are not using.
There has been a case where a real-time clock board was causing a problem because
of an interrupt conflict.
• DISPLAY
Occasional problems have occurred with certain video display cards. If there is
anything unusual about your display, try a standard display mode and monitor for
testing.
• UPDATES
Check with modem manufacturer and computer manufacturer - are there any
software/firmware/hardware updates to the equipment? In one case, the customer
needed a newer driver for his modem.
• CONNECTORS/SOCKETS
Try unplugging and plugging the card, re-seating other cards in the PC, and trying
different slots. This should fix any problem due to poor connections.