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FIND
OUT
WHY
THE
A50
SHUTDO
WN
LED
IS
OFF
Use
this
procedure
when
the
fan
is
rotating.
If
the
fan
is
rotating,
the
A50
SHUTDOWN
LED
turning
o
indicates
the
A50
shutdown
circuit
is
protecting
the
+5
VD
power
supply
from
the
over
voltage
condition.
The
+5
VD
power
line
may
be
shorted
with
one
of
power
lines
higher
than
+5
V
.
The
problem
may
be
in
the
A50
DC-DC
Converter
,
the
A2
post-regulator
,
and
any
of
assemblies
obtaining
the
power
from
+5
VD
supply
and
the
higher
power
supplies
.
1.
Disconnect
the
Cable
from
the
A50J3
Turn
the
analyzer
power
o.
Disconnect
the
cable
from
the
A50J3.
Turn
the
analyzer
power
on.
If
the
A50
SHUTDOWN
LED
is
still
o,
replace
the
A50
DC-DC
Converter
.
If
the
A50
SHUTDOWN
LED
goes
on,
the
A50
DC-DC
Converter
is
veried.
Turn
the
analyzer
power
o
and
reconnect
the
cable
to
the
A50J3.
Continue
with
the
next
Disconnect
the
Cable
from
the
A1J10.
2.
Disconnect
the
Cable
from
the
A1J10
Turn
the
analyzer
power
o.
Disconnect
the
cable
from
A1J10.
Turn
the
analyzer
power
on.
If
the
A50
SHUTDOWN
LED
is
still
o,
replace
the
A1
CPU
.
If
the
A50
SHUTDOWN
LED
goes
on,
the
A1
CPU
is
veried.
Turn
the
analyzer
power
o
and
reconnect
the
cable
to
the
A1J10.
Continue
with
the
next
R
emove
A
ssemblies.
3.
Remove
Assemblies
a.
Turn
the
analyzer
power
o.
b.
Remove
the
assemblies
,
A3,
A5,
A6,
A13,
A17,
A60
and
A70.
Don't
remove
the
A2
post-regulator
.
c.
Turn
the
analyzer
power
on.
If
the
A50
SHUTDOWN
LED
is
still
o,
the
A2
post-regulator
is
probably
faulty
.
Replace
the
A2
post-regulator
.
If
the
SHUTDOWN
LED
is
still
o
after
replacing
the
A2
post-regulator
,
inspect
the
A20
motherboard
for
soldering
bridges
and
shorted
traces
on
the
F
AN
POWER
and
the
F
AN
LOCK
signal
paths
.
If
the
A50
SHUTDOWN
LED
goes
on,
the
A2
post-regulator
and
the
A20
motherboard
are
veried.
Continue
with
the
next
step
.
d.
Reinstall
each
assembly
one
at
a
time
.
Turn
the
analyzer
power
on
after
each
is
installed.
The
assembly
that
causes
the
A50
SHUTDOWN
LED
to
go
on
is
the
most
probable
faulty
assembly
.
Replace
the
assembly
.
5-8
P
ower
Supply
T
roubleshooting
Содержание 4352B
Страница 11: ......
Страница 31: ......
Страница 73: ......
Страница 80: ...Figure 3 4 List Box Menu Adjustments and Correction Constants 3 7 ...
Страница 82: ...Figure 3 6 Reference Frequency Adjustment Location Adjustments and Correction Constants 3 9 ...
Страница 85: ...Figure 3 9 Third IF AMP GAIN Adjustment Location 3 12 Adjustments and Correction Constants ...
Страница 103: ...Figure 4 1 Troubleshooting Organization 4 2 Overall T roubleshooting ...
Страница 113: ......
Страница 130: ...Figure 5 11 Power Supply Block Diagram 1 Power Supply T roubleshooting 5 17 ...
Страница 131: ...Figure 5 12 Power Supply Block Diagram 2 5 18 Power Supply T roubleshooting ...
Страница 132: ...Figure 5 13 Power Supply Block Diagram 3 Power Supply T roubleshooting 5 19 ...
Страница 133: ......
Страница 135: ...Figure 6 1 Digital Control Group Simpli ed Block Diagram 6 2 Digital Control T roubleshooting ...
Страница 146: ...Figure 7 2 Source Group Troubleshooting Flow Source Group T roubleshooting 7 3 ...
Страница 154: ...Figure 8 2 Receiver Group Troubleshooting Flow Receiver Group T roubleshooting 8 3 ...
Страница 198: ...Figure 10 1 Power Supply Functional Group Simpli ed Block Diagram Theory of Operation 10 3 ...
Страница 203: ...Figure 10 3 Digital Control Group Simpli ed Block Diagram 10 8 Theory of Operation ...
Страница 269: ......
Страница 272: ...Figure B 1 Power Cable Supplied Power Requirement B 3 ...
Страница 273: ......
Страница 293: ...Error Messages Numerical Order 0400 Query error 0410 Query INTERRUPTED 0420 Query UNTERMINATED Messages 20 ...