Lenovo ThinkPad 500 Hardware Maintenance Manual - Page 37

Power, system, checkout, Checking, adapter - thinkpad t500 replacement battery

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Power system checkout To verify a symptom, do the following: 1. Turn off the computer. 2. Remove the battery pack. 3. Connect the ac adapter. 4. Check that power is supplied when you turn on the computer. 5. Turn off the computer. 6. Disconnect the ac adapter and install the charged battery pack. 7. Check that the battery pack supplies power when you turn on the computer. If you suspect a power problem, see the appropriate one of the following power supply checkouts: v "Checking the AC adapter" v "Checking operational charging" on page 30 v "Checking the battery pack" on page 30 v "Checking the backup battery" on page 31 Checking the AC adapter You are here because the computer fails only when the AC adapter is used. v If the power problem occurs only when the ThinkPad Essential Port Replicator is used, replace the port replicator. v If the power-on indicator does not turn on, check the power cord of the AC adapter for correct continuity and installation. v If the computer does not charge during operation, go to "Checking operational charging" on page 30 To check the AC adapter, do the following: 1. Unplug the AC adapter cable from the computer. 2. Measure the output voltage at the plug of the AC adapter cable. See the following figure: 3 2 1 (20V) Pin Voltage (V dc) 1 +20 2 0 3 Ground Note: Output voltage of pin no.2 of the AC adapter may different from the one you are servicing. 3. If the voltage is not correct, replace the AC adapter. 4. If the voltage is acceptable, do the following: v Replace the system board. v If the problem persists, go to "ThinkPad T500 and W500" on page 47. Note: Noise from the AC adapter does not always indicate a defect. General checkout 29

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Power
system
checkout
To
verify
a
symptom,
do
the
following:
1.
Turn
off
the
computer.
2.
Remove
the
battery
pack.
3.
Connect
the
ac
adapter.
4.
Check
that
power
is
supplied
when
you
turn
on
the
computer.
5.
Turn
off
the
computer.
6.
Disconnect
the
ac
adapter
and
install
the
charged
battery
pack.
7.
Check
that
the
battery
pack
supplies
power
when
you
turn
on
the
computer.
If
you
suspect
a
power
problem,
see
the
appropriate
one
of
the
following
power
supply
checkouts:
v
“Checking
the
AC
adapter”
v
“Checking
operational
charging”
on
page
30
v
“Checking
the
battery
pack”
on
page
30
v
“Checking
the
backup
battery”
on
page
31
Checking
the
AC
adapter
You
are
here
because
the
computer
fails
only
when
the
AC
adapter
is
used.
v
If
the
power
problem
occurs
only
when
the
ThinkPad
Essential
Port
Replicator
is
used,
replace
the
port
replicator.
v
If
the
power-on
indicator
does
not
turn
on,
check
the
power
cord
of
the
AC
adapter
for
correct
continuity
and
installation.
v
If
the
computer
does
not
charge
during
operation,
go
to
“Checking
operational
charging”
on
page
30
To
check
the
AC
adapter,
do
the
following:
1.
Unplug
the
AC
adapter
cable
from
the
computer.
2.
Measure
the
output
voltage
at
the
plug
of
the
AC
adapter
cable.
See
the
following
figure:
1
2
3
(20V)
Pin
Voltage
(V
dc)
1
+20
2
0
3
Ground
Note:
Output
voltage
of
pin
no.2
of
the
AC
adapter
may
different
from
the
one
you
are
servicing.
3.
If
the
voltage
is
not
correct,
replace
the
AC
adapter.
4.
If
the
voltage
is
acceptable,
do
the
following:
v
Replace
the
system
board.
v
If
the
problem
persists,
go
to
“ThinkPad
T500
and
W500”
on
page
47.
Note:
Noise
from
the
AC
adapter
does
not
always
indicate
a
defect.
General
checkout
29