b. If the voltage is correct, make sure the connection between the DC/DC card and the system board is not loose.

c. Replace the DC/DC card.

d. If the problem is not corrected, replace the system board.

e. If the problem persists, go to “Undetermined Problems” on page 32.

2.Unplug the AC Adapter cable from the ac power outlet and wait 5 minutes or longer to allow the overvoltage protection circuit 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 defect.

Battery Checkout:

If the error is due to the battery,

do the following:

 

1.Turn off the computer.

2.Remove the battery and measure the voltage between the battery terminals+) and 41). (

Terminal

 

Voltage (V dc) / Signal

 

 

 

 

 

1

 

+0 to+13.5

 

 

 

 

 

4

 

Ground ( )

 

 

 

 

 

Note: Signal

lines not used in these steps are used

for

communication between the system and

the

battery.

3.If the voltage is+11less.0 Vthandc, the battery has been discharged. Recharge the battery.

If the voltage is still+11.less0V thandc after recharging, replace the battery.

Note: The voltage of the battery could show 0 V because of the overdischarge protection

14

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Image 16
IBM 380Z manual Battery Checkout, Lines not used in these steps are used, For Communication between the system Battery