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Table
6-4. English/Metric
Pulse
Output Electronics
System
Troubleshooting
I
PRELIMINARY
PROCEDURE
I
1.
If
the
laser
head
does
not
emit
red
light,
check
that
the
rear-panel
POWER
ON
light
is
lit.
If it
is
not,
check
for
a
power
line
short.
This
can
cause
the
power
supply
to
current
limit
and
reduce
the
voltage
output
level
to
near
zero
volts.
Also
check for
an
open
circuit
in
the
power
supply
wiring.
If
the
POWER
ON light
is
lit,
check
the
status
of
the
four
rear-panel
indicators
associ-
ated
with
the
+15-volt supplies
(two
UNBAL
indicators
and
two
FUSE
indicators).
If
power
is
available
to
the
laser
head
but
the
head
does
not
emit
red
light,
refer
to
the
separate
manual
for
the
laser
head
for further
troubleshooting
information.
2.
If
the
LED
indicator
on
one
of
the
system
receivers
does
not
light,
verify
that
the
+I5
volts
is
present
at
the
system
cable
connector
for
the
receiver.
If
it
is
not,
troubleshoot
the
power
supply
and
the
system
wiring.
If
voltage
is
present
at
the
receiver
connector
and
the
LED
is
not
lit,
refer
to
the
separate
manual
for
the
receiver
for
further
troubleshooting
information.
INSTALLATION A N D ALIGNMENT O F LASER HEAD, RECEIVER, A N D
OPTICS PROCEDURE
1.
If
the
laser
head
does
not
emit
red
light, check
that
the
rear-panel
POWER
O N
light
is
lit.
If
it
is
not,
check
for
a
power
line
short.
This
can
cause
the
power
supply
to
current
limit
and
re-
duce
the
voltage
output
level
to
near zero
volts.
Also
check for
an
open
circuit
in
the
power
supply wiring.
If
the
POWER
ON
light
is
lit,
check
the
status
of
the
four
rear-panel
indicators
associated
with
the
fl5-volt
supplies
(two
UNBAL
indicators
and
two
FUSE
indicators).
If
power
i s
available
to
the
laser
head
but
the
head
does
not
emit
red
light,
refer
to
the
separate
manual
for
the
laser
head
for
further troubleshooting
information.
2.
If
the
LED
indicator
on
one
of the
system receivers
does
not
light,
verify
that
the
+I5
volts
is
present
at
the
system
cable
connector
for
the
receiver.
If
it
is
not,
troubleshoot
the
power
supply
and
the
system
wiring.
If
voltage
is
present
at
the
receiver
connector
and
the
LED
is
not
lit,
check
optics
and
alignment
(refer
to
Section
11).
ELECTRONIC INSTALLATION PROCEDURE
1.
If
$5
volts
is
not
present
at
the
10740A
Coupler
rear
panel,
check
power
wiring
for
a
short
or open
circuit.
Also
check
the
output
of
the
power
supply
with the
cables
disconnected.
2.
If
the reference
or
measurement
LED
indicators
on
the
10760A
Counter
cards
do
not
all
light
when
power
is
applied,
verify
presence
of
reference
signal
from
laser
head
and
measurement
signal
from
each
receiver.
If
either
signal
is
not
present,
troubleshoot
the
laser
head,
asso-
ciated
receiver,
or
optics
(refer
to
Section
11).
If
the
signals
are
present,
troubleshoot
the
associated
10760A
Counter
card.
Counter
cards
can
be
interchanged
at
this
point
to
verify
trouble
source.
3.
If
the
+
or
-15V
dc
power
source
supplies
a
small
voltage
(near
zero
volts)
check
for
a
short
circuit
in
the
10740A
Coupler
or
on
the
10755A
Compensation
Interface
card.
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Troubleshooting
