CHECKOUT GUIDE
by removing one of the devices, use the computer under
the same condition, and see whether a power shutdown
occurs. Do this procedure for all devices to determine the
cause.
Power Systems Checkout
To verify the symptom of the problem, power on the
computer using each of the following power sources:
1. Remove the battery pack.
2. Connect the AC Adapter and check that power is
supplied.
3. Disconnect the AC Adapter and install the charged
battery pack; then check that power is supplied by the
battery pack.
If you suspect a power problem, see the appropriate power
supply checkout in the following list:
“Checking the AC Adapter”
“Checking Operational Charging” on page 37
“Checking the Battery Pack” on page 37
“Checking the Backup Battery” on page 38
Checking the AC Adapter:
You are here
because the computer fails only when the AC Adapter is
used:
1. If the power problem occurs only when the port
replicator is used, replace the port replicator.
2. If the power-on indicator does not turn on, check the
power cord of the AC Adapter for correct continuity
and installation.
3. If the operational charge does not work, go to
Checking Operational Charging.
4. Unplug the AC Adapter cable from the computer and
measure the output voltage at the plug of the AC
Adapter cable. See the following figure:
(16 - 10 V)
5. If the voltage is not correct, replace the AC Adapter.
6. If the voltage is within the range, do the following:
Replace the system board.
Pin
Voltage (V dc)
1
+
15.5 to
+
17.0
2
Ground
36
Summary of Contents for ThinkPad 770E
Page 80: ...FRU REMOVALS AND REPLACEMENTS 74...
Page 102: ...FRU REMOVALS AND REPLACEMENTS Locate the microphone spacer and cable 96...
Page 111: ...FRU REMOVALS AND REPLACEMENTS ThinkPad 770 770E 770X and 770Z 105...
Page 123: ...PARTS LIST Parts List ThinkPad 770 770E 770X and 770Z 117...
Page 136: ...IBM Part Number 37L5152 Printed in U S A S1 L 9621 2...
