Step
1520-8
Is
there
power
to
the
drawer?
NO
Go
to
“Step
1520-9.”
YES
Go
to
″
MAP
0410:
Repair
Checkout
″
in
the
Diagnostic
Information
for
Multiple
Bus
Systems
.
Step
1520-9
Set
the
circuit
breaker
to
the
off
position,
and
replace
the
power
cable
between
the
circuit
breaker
and
the
device.
Is
there
power
to
the
drawer?
NO
Go
to
“Step
1520-14”
on
page
20.
YES
Go
to
″
MAP
0410:
Repair
Checkout
″
in
the
Diagnostic
Information
for
Multiple
Bus
Systems
.
Step
1520-10
Are
all
the
circuit
breakers
turned
on?
NO
Turn
the
circuit
breakers
on.
Then
go
to
″
MAP
0410:
Repair
Checkout
″
in
the
Diagnostic
Information
for
Multiple
Bus
Systems
.
YES
Go
to
“Step
1520-11.”
Step
1520-11
1.
Set
all
of
the
circuit
breaker
switches
to
the
off
position
(switches
in
the
down
position).
2.
Locate
terminal
board
2
(TB2)
on
the
outside
of
the
rear
cover
of
the
power
distribution
panel.
3.
Measure
for
-40
to
-60
V
dc
on
terminal
board
2
(TB2)
between
positions
one
and
two
(side
A
circuit
breaker)
and
between
positions
five
and
six
(side
B
circuit
breaker).
Is
the
voltage
between
-40
and
-60
V
dc?
NO
Go
to
“Step
1520-12.”
YES
Go
to
“Step
1520-13”
on
page
20.
Step
1520-12
1.
Remove
the
six
screws
attaching
the
top
cover
of
the
power
distribution
panel.
2.
Remove
the
top
cover
and
then
remove
the
insulator.
3.
Using
a
multimeter,
attach
the
black
multimeter
cable
lead
to
the
return
bus
bar
(+),
and
then
attach
the
red
multimeter
cable
lead
to
the
-48
V
dc
bus
bar
(-).
4.
Measure
for
-40
to
-60
V
dc
between
the
-48
V
dc
bus
bar
(upper
bar)
and
the
return
bus
bar
(lower
bar)
in
the
power
distribution
panel.
Was
the
correct
voltage
present?
NO
Ask
the
customer
to
check
the
power
source
for
the
correct
voltage,
and
check
the
external
power
cable
(from
customer’s
power
source)
for
continuity.
YES
Go
to
“Step
1520-13”
on
page
20.
Chapter
2.
Maintenance
Analysis
Procedures
19
Summary of Contents for THINKPAD T42 -
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