Power Supply Troubleshooting - Toshiba T3400 Maintenance Manual

2.3

Power Supply Troubleshooting

The power supply controls many functions and components. To determine if the power
supply is functioning properly, start with Procedure 1 and continue as instructed. The proce-
dures described in this section are:
Procedure 1:
Procedure 2:
Procedure 3:
Procedure 1 DC IN Icon Indicator Check
The AC adapter converts AC to DC power and contains a charging circuit for charging the
batteries. The adapter connects to the DC IN socket connector on the back side of the com-
puter. When the AC adapter is connected and power is off, the AC adapter charges the
batteries.
The DC IN icon displays whether or not the AC adapter is connected and supplying power.
When the DC IN icon is green, the AC adapter is connected and supplying power.
If the DC IN icon does not light, the AC adapter is not supplying power, go to Check
1.
If the DC IN icon is flashing green, the AC adapter 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 DC IN icon LED indica-
tor lights are not burned out before performing the following checks:
Check 1 Make sure the correct AC adapter cable is firmly plugged into the DC IN socket
on the back of the computer.
Check 2 If the DC IN icon flashes green when the AC adapter is connected, its voltage
output is abnormal. Connect a new AC adapter and turn the T3400/T3400CT on
again to verify the indicator condition.
Check 3 The battery pack may be malfunctioning. Replace the battery pack and turn the
computer on again. If the problem persists, perform Check 4.
Check 4 Place the T3400/T3400CT in an environment between –20°C and 70°C until at
ambient temperature. Repeat the steps which caused abnormal operation. If the
same problem persists, perform Procedure 3.
T3400/T3400CT Maintenance Manual
DC IN Icon Indicator Check
Battery LED Indicator Check
Connection and Replacement Check
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