Checking the Voltage Converter (700, 700C)

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.

       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.

   Signal	Vdc Min.	Vdc 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

    

    
   NOTE: Only VOLT is marked on the system board.  Use the above figure to locate the VA, VG, VB, VC, and PWRGOOD  signal names.

   •  If all voltages are correct, the voltage converter is  operating correctly.
   •  If the voltages are not correct, go to the next step.

8.  Power-off the computer and unplug the AC adapter cable  from the computer.
9.  Check for a short circuit between  GND and VA, VG, VB, or VC.
   •  If there is a short circuit,  replace the following FRUs one at  a time to correct the problem.
     •  Voltage converter
     •  System board

   •  If there is no short circuit, go to the next step.

10.  Check the output voltage of the AC adapter cable  (see 'Checking the AC Adapter')
    •  If the output voltage is correct, go to the next step.

11.  Replace the following FRUs one at a time.
    •  Voltage converter
    •  System board

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