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TROUBLESHOOT
THE
F
AN
AND
THE
A50
DC-DC
CONVERTER
P
erform
the
following
procedure
to
troubleshoot
the
fan
and
the
A50
DC-DC
Converter
.
1.
Troubleshoot
the
F
an
a.
Turn
the
analyzer
power
o.
b.
Disassemble
the
rear
panel.
c.
Remove
the
fan
power
cable
from
the
Motherboard
A20J18.
d.
Connect
a
DC
power
supply
,
a
10
k
resistance
,
and
a
oscilloscope
to
the
fan
power
cable
using
appropriate
wires
as
shown
in
Figure
5-8 .
Figure
5-8.
F
an
Troubleshooting
Setup
e.
Turn
the
DC
power
supply
on.
A
djust
the
output
voltage
to
+24
V
.
f.
Check
the
fan
is
rotating.
Check
the
F
AN
LOCK
signal
is
as
shown
in
Figure
5-8.
If
the
fan
is
not
rotating
or
the
F
AN
LOCK
signal
is
unexpected,
replace
the
fan.
If
these
are
good,
the
fan
is
veried.
g.
Reconnect
the
fan
power
cable
to
the
Motherboard
A20J18.
5-12
P
ower
Supply
T
roubleshooting
Summary of Contents for 4352B
Page 11: ......
Page 31: ......
Page 73: ......
Page 80: ...Figure 3 4 List Box Menu Adjustments and Correction Constants 3 7 ...
Page 82: ...Figure 3 6 Reference Frequency Adjustment Location Adjustments and Correction Constants 3 9 ...
Page 85: ...Figure 3 9 Third IF AMP GAIN Adjustment Location 3 12 Adjustments and Correction Constants ...
Page 103: ...Figure 4 1 Troubleshooting Organization 4 2 Overall T roubleshooting ...
Page 113: ......
Page 130: ...Figure 5 11 Power Supply Block Diagram 1 Power Supply T roubleshooting 5 17 ...
Page 131: ...Figure 5 12 Power Supply Block Diagram 2 5 18 Power Supply T roubleshooting ...
Page 132: ...Figure 5 13 Power Supply Block Diagram 3 Power Supply T roubleshooting 5 19 ...
Page 133: ......
Page 135: ...Figure 6 1 Digital Control Group Simpli ed Block Diagram 6 2 Digital Control T roubleshooting ...
Page 146: ...Figure 7 2 Source Group Troubleshooting Flow Source Group T roubleshooting 7 3 ...
Page 154: ...Figure 8 2 Receiver Group Troubleshooting Flow Receiver Group T roubleshooting 8 3 ...
Page 198: ...Figure 10 1 Power Supply Functional Group Simpli ed Block Diagram Theory of Operation 10 3 ...
Page 203: ...Figure 10 3 Digital Control Group Simpli ed Block Diagram 10 8 Theory of Operation ...
Page 269: ......
Page 272: ...Figure B 1 Power Cable Supplied Power Requirement B 3 ...
Page 273: ......