Power

System

Checkout

 

To verify the symptom of

the problem power on th

puter

using

each of the

following power sources:

1.Remove the battery.

2.Connect the AC Adapter and check that power plied.

3.Disconnect the AC Adapter and install the cha battery; then check that power is supplied b battery.

If you suspect a power problem, refer the the power supply check listed below:

Ÿ “Checking the AC Adapter”

Ÿ “Checking the Operational Charging” on page 33

Ÿ“Checking the Battery” on page 33

Checking the AC Adapter:

You are here

 

because the computer fails only when the

AC Adap

used:

 

 

 

Ÿ If the power problem

occurs

only when

the Th

Port Replicator with Advanced

Etherjet

Feature.

ŸIf the power-on indicator does not turn on, c

power cord of the AC Adapter for correct c and installation.

ŸIf the operational charge does not work, go “Checking the Operational Charging” on page 33.

Unplug the AC Adapter cable from the computer an measure the output voltage at the plug of the A cable. See the following figure.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Pin

 

Voltage

(V

dc)

 

 

 

 

 

 

 

1

 

+15.5

to

+17.0

 

 

 

 

 

 

 

2

 

Ground

 

 

 

 

 

 

 

If

the voltage is not correct, replace the AC

If the voltage is within the range, do the fol

Ÿ Replace the DC-DC & BATT board.

Ÿ Replace the system board.

ŸIf the problem is not corrected, go to “Und Problems” on page 45

Note: An audible noise from the AC Adapter does n

always indicate a defective adapter.

32 ThinkPad 390X / i 1700 HMM

Page 38
Image 38
IBM I 1700 manual Voltage is not correct, replace the AC, Pin