Lenovo ThinkPad 560E ThinkPad 560X Hardware Maintenance Manual (Oct 1997) - Page 42

Checking the Backup Battery, Status Indicator Checkout, System Board Checkout

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4. If the voltage is more than +11.0 V dc, measure the resistance between battery terminals 3 and 4. The resistance must be 4 to 30 K ohm. If the resistance is not correct, replace the battery pack. If the resistance is correct, replace the DC/DC card. If the problem persists, replace the system board. Checking the Backup Battery 1. Power off the computer and unplug the AC Adapter from the computer. 2. Turn the computer upside down. 3. Remove the DIMM cover and backup battery (see "1010 Backup Battery" on page 60). 4. Measure the voltage of the backup battery. See the following figure. Wire Red Black Voltage (V dc) +2.5 to +3.7 Ground If the voltage is correct, replace the system board. If the voltage is not correct, replace the backup battery. If the backup battery discharges quickly after replacement, replace the system board. Status Indicator Checkout If an LED problem occurs, do the following: 1. Power off the computer. 2. Power on the computer. 3. All the LEDs in the indicator panel should turn on for a moment after the computer is powered on. Make sure they turn on. If the problems persists, replace the system board. System Board Checkout The processing functions are performed by the system board. When a numeric code calls the system board as a FRU, use the following procedure to isolate the problem: 32 IBM ThinkPad 560X (2640-60x, 70x) HMM

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4.
If the voltage is more than
+
11.0 V dc, measure the
resistance between battery terminals 3 and 4.
The
resistance must be 4 to 30 K ohm.
If the resistance is not correct, replace the battery
pack.
If the resistance is correct, replace the DC/DC
card.
If the problem persists, replace the system
board.
Checking the Backup Battery
1.
Power off the computer and unplug the AC Adapter
from the computer.
2.
Turn the computer upside down.
3.
Remove the DIMM cover and backup battery (see
“1010
Backup Battery” on page
60).
4.
Measure the voltage of the backup battery.
See the
following figure.
±
If the voltage is correct, replace the system board.
±
If the voltage is not correct, replace the backup
battery.
±
If the backup battery discharges quickly after
replacement, replace the system board.
Wire
Voltage (V dc)
Red
+
2.5 to
+
3.7
Black
Ground
Status Indicator Checkout
If an LED problem occurs, do the following:
1.
Power off the computer.
2.
Power on the computer.
3.
All the LEDs in the indicator panel should turn on for
a moment after the computer is powered on.
Make
sure they turn on.
If the problems persists, replace the system board.
System Board Checkout
The processing functions are performed by the system
board.
When a numeric code calls the system board as a
FRU, use the following procedure to isolate the problem:
32
IBM ThinkPad 560X (2640-60x, 70x) HMM