IBM 300 Service Manual page 54

Installing the NAS and Its Modem
If any of these items are missing or damaged, contact the place of purchase for
instructions on how to exchange your modem or obtain the missing items.
Figure 1-46. 7858 Operator Panel Display
1-40
2220 Setup and Service Guide
Attention
In order to avoid damage to the unit, verify the modem input ac voltage setting
against the power voltage source available at your wall socket before starting
the installation.
If needed, you can easily move the selector switch to the correct position by
using a screwdriver or a pen:
v Switch set to 115 for low voltage range: 90 - 137 V ac.
v Switch set to 230 for high voltage range: 180 - 265 V ac.
1. ____ Be sure that the power switch located on the modem rear panel is OFF
(switch in position "O").
2. ____ Plug the switched line telecommunication cable shipped with the modem
into the PSTN socket located on the modem rear panel. If this modem is not
being installed in the United Kingdom, connect the other end of the cable to
the telecommunication line.
3. ____ Connect the power attachment cord to the ac power socket located on
the modem rear panel and the power plug to a standard 3-pin grounded ac
outlet. Then, if this modem is being installed in the United Kingdom, connect
the telecommunication cables that you have attached to the modem to the
telecommunication lines.
4. ____ Observe the modem power-on sequence.
This is the normal power-on sequence:
v PWR light is turned on.
v SELFTEST RUNNING message displays for about 15 seconds.
Set the modem power switch to ON (switch in position I).
If the PWR light is not ON and the voltage selector switch is correctly set and
you are sure that the power voltage is present at the wall socket, the modem
is defective and should be replaced.
If the message SELFTEST RUNNING does not appear on the operator panel
within 10 seconds, the modem is defective and should be replaced. This
message remains on the display for about 15 seconds until it is changed by
the power-on sequence.
If the modem is set to the factory defaults, the operator panel shows :
AT CMD ec aa
td_ rd_ dsr_ II_
This operational message shows that the modem is set in AT command mode
for switched line operation with error control enabled and that it will
auto-answer an incoming call.