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Storage Switch

Note: Signal lines, not used in these steps, are used

for communication between the system and

the battery. The storage switch is used to

control the power to the internal

microprocessor of the battery. The storage

switch should be set to off (0) only when the

battery is going to be kept in storage for more

than two months.

3. If the voltage is less than +8.0 V dc, the battery pack

has been discharged or is defective. Recharge the

battery. If the recharging does not work, go to Step 5

to check the charging circuit.

If the voltage is still less than +8.0 V dc after the

recharging, replace the battery.

4. If the voltage is more than +8.0 V dc, measure the

resistance between battery terminals 3 and 4. The

resistance must be 4 to 30 kilohms.

If the resistance is not correct, replace the battery

pack.

If the resistance is correct, replace the DC/DC card.

5. To check the charging circuit, do the following. Plug

in the AC Adapter with the battery pack removed,

then power-on the computer.

6. Measure the charging voltage between DC/DC

terminals 1 (+) and 4 (−).

Terminal Voltage (V dc) / Signal

1 +8.0 to +16.0

2 Send

3 Thermal

4 Ground (−)

5 R1

6 Select

7 R2

ThinkPad 355x, 360x, 370C, 750x, 755C, 755Cs 209

IBM ThinkPad 755 Series User Manual

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