5634RCS User’s Manual
64
The following diagnostic diagram will illustrate some simple methods to isolate your
modem problem. Refer to the flowchart in figure C-1 step by step to isolate your hardware
problem.
POWER
ON
NO
Power Adpater
damage
NO
Check if the line
quality is OK
(you can try to use
another phone line
with your modem)
Check if the dialing
up AT command
operation is
correctly set
Check if the COM
Port and RS-232
cable are linked
properly
Check if the
communication
software is
correctly
configured
Check if the Power
Adapter is O.K.
Check if the MR
indicator is turned
on
Check if TR
indicator is turned
on
Try to Dial up or
answer a call
Check if OH
indicator is turned
on
Wait for remote
modem "Carrier"
signal
Check the dialing
or answering AT
command is been
correct set
Check if the CD
indicator is turned
on
Check if the
remote modem is
ready to receiving
your call
Baud Rate is
setting correctly
Modify the baud
rate setting
YES
YES
YES
YES
YES
YES
NO
NO
NO
YES
YES
NO
YES
YES
YES
YES
Contact the
delear
YES
Display
"CONNECT"
message
Type AT
then press
Enter
YES
NO
NO
NO
Figure C-1 Hardware Troubleshooting Diagnosis