R&S SMU200A Troubleshooting
1007.9845.82 3.17 E-6
• Error: Short-circuit of one or more operating voltages
A
ction
P
ossible error causes and further steps
Check on the bottom of the motherboard
which of the voltages is short-circuited:
+U5V2_PS Rated value: +5.2 V
+U3V3_PS Rated value: +3.4 V
X237.1 Rated value: -6.5 V
X237.3 Rated value: -12.0 V
X237.5 Rated value: +12.0 V
X237.7 Rated value: +6.5 V
Check on the bottom of the motherboard if
the fuses are defective:
Analog slots:
+5.2 V: F13
+3.3 V: F12
+6.5 V: F1, F3, F23
+12.0 V: F2
Digital slots:
+5.2 V: F14 to 18, F21, F25
+3.3 V: F4,F5,F8 to 11, F24
Controller:
+5.2 V: F19,F20,F22
Since all operating voltages are fed to the modules via
fuses, no voltage / insufficient voltage here indicates that
the power supply is defective.
Note: With instruments from pilot series, –6.5 V and –
12.0 V are not fed via fuses.
Error at -6.5 V, -12 V
Remove modules in sequence until error
disappears.
Note: The operating voltages of the individual modules
can also be queried by means of diagnosis / test
points. The DACIF board must, however, be
functioning correctly.
The power supply switches off as a result of
overloads caused by overheating. If this is the
case, you have to wait until the power supply has
cooled down again.
The 5.2 V supply of the controller is started with a
controlled slope via FET V1.Check this, if the
controller does not start.
• Error: Fan does not work.
Action Possible error causes and further steps
Check voltage at connector:
X223,X224: Rated value: 8 to 12 V,
temperature-dependent.
Voltage not in rated range:
Fan or DACIF board fan control defective.
Fit new fan / DACIF board.
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