Manual

Maintenance and Troubleshooting 8-25
Replacing EMU Components
IETG allows you to replace the following components in EMUs
supporting communications for externally-powered FlowHawks,
when necessary:
 GSM/GPRS Modem
 SIM Card
Note: Do not open the Communication Interface/Barrier
Box inside the EMU under any circumstances. In addition,
do not attempt to perform any component-level repair.
Replacing the Modem in the EMU
Replace the quad-band GSM/GPRS modem (p/n 507959) in the
EMU in the following way:
1. Disconnect the external power supply running to the EMU.
2. Open the enclosure in which the EMU is installed.
3. Loosen the four plastic screws on the cover of the EMU,
remove the cover, and then carefully set the cover aside to
avoid damage and prevent dirt from contacting the cover
gasket.
4. Disconnect the antenna cable from the modem by unscrewing
the gold nut (at the connector end of the antenna cable) from
the modem connector.