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5.3 Checking the Battery Pack
1.
Invert the system unit and place it on its top.
2.
Remove the battery pack and measure the voltage at the battery
terminals between 1 (+) and 3 (-).
PICTURE 4
+------------------------------------------------------------------------+
¦ Pin
+------------------------------------+-----------------------------------¦
¦ 1
+------------------------------------+-----------------------------------¦
¦ 2
+------------------------------------+-----------------------------------¦
¦ 3
+------------------------------------------------------------------------+
If the voltage is less than +8.5 V dc, the battery pack is
discharged or defective.
If the voltage is more than +8.5 V dc, go to the next step.
3.
Using a low-power ohm meter, measure the resistance at the battery
terminals between
2 ( T) and 3 (-).
4 kilohms to 30 kilohms.
If the resistance is out of range, replace the battery pack.
4.
Remove the bottom cover and set the battery pack in place without
connecting any external power devices.
5.
Measure the voltage at the connector between terminals 1 (+) and 3 (-)
on the voltage converter and note the voltage.
PICTURE 5
6.
Using the AC adapter, apply external power to the system.
Warning:
Be careful not to cause a short circuit while doing the
following steps.
The charging circuit is active even if the system
power switch is set to off.
7.
Measure the voltage again between terminals
1 (+) and 3 (-).
If the voltage is not greater than that measured in Step 5,
replace the AC adapter, then go to the next step.
If the voltage is greater than that measured in Step 5, the
battery pack is good.
Repeat Steps 6 and 7 using a new AC adapter.
still not greater than that measured in Step 5, replace the
voltage converter.
IBM PS/2 Model N51 SX HMS
Checking the Battery Pack
¦ Voltage (V dc)
¦ +8.5 to +18.0
¦ Thermal Detection
¦ Ground
The resistance must be
¦ Copyright IBM Corp. 1991
5.3 - 1
¦
¦
¦
¦
If the voltage is
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