Chapter 6
Tools
Utilities
4460 GSM System Option and 4468 EDGE System Option
Version 12.20
225
MS Power Supply Option
This menu allows you to select and switch on/off the required supply voltage for
the mobile phone, for use with the MS Power Supply option of the 4400. The MS
Power Supply options is meant to replace a battery e.g. in environments where
the original battery is not yet connected to the mobile (such as in manufacturing
lines) or where faults must be traced back to either the phone or the battery
(such as in service). Moreover, the MS Power Supply can be used to test the effect
of over- or under-voltage on RF transmitter, RF receiver and audio parts.
Connection
: The MS Power Supply connector can be found at the left-hand side
of the 4400 front panel, below the USB ports (or floppy disk drive on old instru-
ments). The MS Power Supply option comes with a cable of one meter length.
One end of the cable can be plugged into the 4400, while the other end is open-
ended. The open ends can be used to connect the power supply to a fixture
holding the mobile phone. Willtek delivers the cable with open ends because
these fixtures are manufacturer-specific and hence open ends are most
universal.
The Supply entry field can be used to select a supply voltage in the range 0 to
approximately 11 V DC, in steps of 0.05 V (i.e. 50 mV). The option is specified from
0 to 10 V; higher voltages may or may not be achievable, depending on the
current being drawn from the power supply.
A status field next to the supply voltage entry field indicates the current status
of the power supply, i.e. either ON or OFF. A softkey is available to turn the ‘supply
on’ or ‘supply off’, respectively.
NOTE
For safety reasons, the supply voltage is always off at power-on. So the power
supply has to be switched on when required.
NOTE
If the power supply is short-circuited, the supply voltage and current goes
down. When the short circuit is removed again, the voltage will come back
after a few seconds (PTC resistor).
