2.3 Power Supply Troubleshooting
The T1900fr1900C's power supply controls many functions and components in the
computer. To detennine
if
the power supply is functioning properly, start with Procedure 1
and continue with the other procedures as instructed. Procedures described in this section are:
Procedure
1:
DC
IN
LED Indicator Check
Procedure
2:
Battery LED Indicator Check
Procedure
3:
System PCB Replacement Check
Procedure 1
DC
IN LED Indicator Check
The
T1900fr1900C's AC adapter converts AC power
to
DC power and contains a charging
circuit which charges the computer's batteries. The adapter connects
to
the DC
IN
socket
connector on the left side
of
the computer. When it is connected and the power is turned off,
the AC adapter charges the batteries.
The DC
IN
indicator displays whether
or
not the AC adapter is connected and supplying
power.
o When the DC
IN
indicator is orange, the AC adapter is connected and supplying
power
to
the computer.
o
If
the DC
IN
indicator does not light, the AC adapter is not supplying power to
the computer,
or
is not attached
to
the computer,
go
to
Check 1 .
..
o
If
the DC
IN
indicator is flashing orange, the AC adapter's voltage supply
is
abnormal
or
the power supply is not functioning properly, go
to
Check
1.
If
any
of
the above indicator conditions are abnormal, make sure the LED indicator lights are
not burned out before performing the following Checks.
Check 1 Make sure the correct AC adapter's cable is firmly plugged into the DC
IN
socket
on the back
of
the computer.
T1900 (PA2417U),
1.1
A T1900C (pA2478U), 1.7 A
Check 2
If
the DC
IN
indicator flashes orange when the AC adapter is connected, its
voltage output is abnormal. Connect a new AC adapter and
tum
the computer on
again
to
verify the indicator condition.
2-5
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