Power System Checkout; Checking The Ac Adapter - Lenovo ThinkPad W700ds Hardware Maintenance Manual

Table 1. FRU tests (continued)
FRU
TrackPoint or pointing
device
Touch Pad

Power system checkout

To verify a symptom, do the following:
1. Turn off the computer.
2. Remove the battery pack.
3. Connect the ac adapter.
4. Check that power is supplied when you turn on the computer.
5. Turn off the computer.
6. Disconnect the ac adapter and install the charged battery pack.
7. Check that the battery pack supplies power when you turn on the computer.
If you suspect a power problem, see the appropriate one of the following power supply checkouts:
• "Checking the ac adapter" on page 35
• "Checking operational charging" on page 36
• "Checking the battery pack" on page 36
• "Checking the backup battery" on page 37

Checking the ac adapter

You are here because the computer fails only when the ac adapter is used.
• If the power problem occurs only when the ThinkPad W700 Mini Dock is used, replace the Mini Dock.
• If the power-on indicator does not turn on, check the power cord of the ac adapter for correct continuity
and installation.
• If the computer does not charge during operation, go to "Checking operational charging" on page 36
To check the ac adapter, do the following:
1. Unplug the ac adapter cable from the computer.
2. Measure the output voltage at the plug of the ac adapter cable. See the following figure:
Applicable test
If the TrackPoint does not work, check the configuration as specified in the BIOS Setup
Utility. If the Trackpoint is disabled, select Automatic to enable it.
After you use the TrackPoint, the pointer may drift on the screen for a short time. This
drift can occur when a slight, steady pressure is applied to the TrackPoint pointer.
This symptom is not a hardware problem. If the pointer stops after a short time, no
service action is necessary.
If enabling the TrackPoint does not correct the problem, continue with the following:
• Interactive Tests ➙ Mouse.
If the Touch Pad does not work, check the configuration as specified in the BIOS Setup
Utility. If the Touch Pad is disabled, select Automatic to enable it. If enabling the Touch
Pad does not correct the problem, continue with the following:
• Interactive Tests ➙ Mouse.
Pin Voltage (V dc)
1 +20
2 0
3 Ground
.
Chapter 3 General checkout
35