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Table
6-3.
Binary
Controlled
Comparator-Based Systems
Troubleshooting
PRELIMINARY PROCEDURE
1.
If
the
laser
head
does
not
emit
red
light,
check
that
the
rear-panel
POWER
ON
light
i s
lit.
If
it
i s
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
+15-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
+15
volts
i s
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
ON
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
k15-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
+15
volts
is
present
at
the
system
cable
connector
for
the
receiver.
If
it
i s
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
It).
ELECTRONIC INSTALLATION PROCEDURE
1 .
If
+I5
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
reference
LED
does
not
light
on
the
10764B
Fast
Pulse
Converter
card,
check
for
pres-
ence
of
reference
signal
from
laser
head
and,
if
the
signal
is
present,
replace
or
trouble-
shoot
the
107646
card.
If
measurement
LED
does
not
light,
check
for
the
measurement
signal
from
the
associated
receiver.
If
the
signal
is
present,
replace
or
troubleshoot
the
10764B
card.
If
either
signal
is
not
present,
troubleshoot
the
associated
unit.
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Table of Contents
Troubleshooting
