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Maintenance & Troubleshooting 7 - 13

Mobile 
computer is not 
communicating 
through the 
modem.

The modem cable is not 
fully connected.

Connect the modem cable securely to both the modem and the 
telephone jack.

Modem is not securely 
connected to the mobile 
computer.

Reconnect the modem firmly to the mobile computer.

Communication software 
is not installed or 
configured properly.

Set up the communication software as described in the MC909X 
Integrator Guide.

Problem in the telephone 
lines.

Connect a conventional telephone and dial the remote modem to 
verify the telephone lines are functioning. If the remote modem does 
not answer the call and emit answering tones, contact the remote 
System Administrator. 

Mobile computer’s 
battery is low or 
discharged, which shuts 
off power to the modem.

Install a charged battery in the MC909X, or use an external DC power 
adapter to recharge the battery. 

ActiveSync 
fails.

A partnership was not 
established with the host 
computer.

Establish a partnership with the host computer (refer to the MC909X 
Integrator Guide).

Host computer is not 
selected in the 
ActiveSync window on 
the mobile computer.

Select a host computer in the ActiveSync window, and perform setup 
(refer to the MC909X Integrator Guide).

Mobile computer or 
modem was 
disconnected from the 
telephone line while 
ActiveSync was in 
progress.

Disconnect the modem cable for 30 seconds to hang up the local 
telephone connection. Close any open windows on the mobile 
computer and any modem connections.