IBM 310ED - Manual (Page 33)

Checking the AC Adapter: You are here because
the computer fails only when the AC Adapter is used.
If the power-on indicator of the AC Adapter does not turn
on, make sure of the following:
Power cord is not damaged.
Power cord is securely connected to the AC Adapter
and AC power outlet.
If the above confirmation does not solve the problem,
replace the AC Adapter.
If the power-on indicator of the AC Adapter is on, then
proceed to the next step.
1. Unplug the AC Adapter cable from the computer and
measure the output voltage at the plug of the AC
Adapter cable.
Replace the system board.
If the problem is still not corrected, go to
“Undetermined Problems” on page 23.
If the voltage is not correct, go to the next step.
2. Unplug the AC Adapter cable from the AC power
outlet and wait five minutes or longer to allow the
over-voltage protection circuit of the AC Adapter to be
fully discharged and initialized.
3. Plug the AC Adapter cable into the AC power outlet.
4. Measure the output voltage of the AC Adapter.
5. If the voltage is still not correct, replace the AC
Adapter.
Note: An audible noise from the AC Adapter does not
always indicate a defective adapter.
Pin Voltage (V dc)
1 19.0 to 20.5
2 Ground
ThinkPad 310, 310D, 310E, 310ED (2600) 9