ŸIf the problem is not corrected, replace the qui charger or the power cord.

3. Install the battery pack into the quick charger.

ŸIf the charging indicator does not start blinking, replace the quick charger.

Checking

the Voltage

Converter

(700,

700C):

Use

the

following procedure to isolate a

problem

with

the

ThinkPad

700, 700C voltage converter.

Note: If the problem only occurs when using the computer with a good battery pack, replace the voltage converter.

1.Power-off the computer.

2.Power-off all attached devices and disconnect them from the computer.

3.Unplug the AC adapter cable and remove the battery pack from the computer.

4.Carefully place the computer bottom-side up and

 

remove the

bottom cover.

5.

Plug the

AC

adapter cable into the computer.

6.

Power-on

the

computer.

Important

Be careful not to actuate the suspend switch (located between the Esc key and the LCD) during the operation. When you turn the computer upside down with the LCD opened, put something under the computer to prevent accidentally actuating the suspend switch.

7.Check the voltages of the voltage converter on the system board. See the following figure.

Signal

V dc Min.

V dc Max.

 

 

 

VA

+4.75

+5.25

VG

+4.75

+5.25

VB

+4.75

+5.25

VC

+3.42

+3.78

PWRGOOD

+4.00

+5.25

 

 

 

ThinkPad 700, 700C, 720, 720C (9552)77