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AC Adapter Test
Do
the
following to analyze an AC Adapter
problem.
I. Unplug
lhe
AC Adapter from
lhe
power outlet and
lhe
computer.
.
2.
Inspect
lhe
AC Adapter for any
signs
of overheatmg
or
damage.
3.
Inspect
lhe
AC Adapter power cord for cuts or
damage.
Replace the
power cord,
if
necess~.
4. Plug lhe power
cord
inlo lhe
power
outl~t.
Listen
for any
sound
that
might
indicate
defective
operation.
s.
Measure
the
output voltage al the
AC
Adapter
plug
between
pins
I
and
3.
Pin
Voltage
(V
de)
Signal Name
I
2
3
4
+17.8
to
+2
1
de
oulpul
VCCSEL# (VCCC
mode
select
signal)
de
ground
RTN
Open
If the voltage is
incorrect,
but
not
0,
replace the AC
Adapter.
•
If
the
voltage
is
O,
check
the power
cord
and
the
power outlet.
Jf
the power
cord
and power
outlet
are
OK,
replace
the AC Adapter.
•
If the voltage is
correct,
suspect a
short circuit
or a
failure
in
the
computer.
Go to
"System Power
c
Problems" on page
17.
14
ThinkPad Power
Series 820
If
the
system
does
not
start
up when
the
system
is
powered on
with the
battery
pack removed
and
the
AC Adapter
connected,
and
if
you
hear noise
coming
from the
AC Adapter, suspect a
short circuit in the
computer. Go
10
the
"System
Power
Problems"
on
page 17.
•
If the system stans up
with the battery pack installed
and
the AC
Adapter
disconnected, replace
the
DC/DC card and make
sure
that the system
starts
up
with the AC Adapter
connected. If
the system
starts
up,
the
original
DC/DC
card
was bad.
If the
system
still
does not start up,
replace the
AC Adapter
and
reinstaU the
original DC/DC card.
Make sure the
system
starts
up with the new AC Adapter and the
original
DC/DC
card.
Battery Pack Test
Note: When the battery
power becomes
low, the
computer
alerts
you
by sounding three
short
beeps.
When it
becomes critically
low,
the
computer generates
six long
beeps.
I.
Remove the battery pack
from
the
computer.
2.
Make
sure
that the storage switch
D
on
the
battery
pack
is
in the
ON (I) position.
3.
Measure the
voltage between
battery pack
terminals
+and -.
Terminals
Description
+
+8.4
±
2.1 V
de
s
Data
T
Thermal
-
Ground
Hardware Maintenance
Service
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