
Low Voltage Power Supply Voltage Tolerances
Supply Voltage Tolerance
+5.1 V ±153 mV (+4.947 V to +5.253 V)
–5.25 V ±158 mV (–5.092 V to –5.408 V)
+15.75 V +1.260 V, –787 mV (+14.963 V to +17.010 V)
− 15.75 V ±787 mV (−14.963 V to −16.537V)
9 Is the fan running?
If yes, go to "To run the internal self-tests," on page 4-41. If not, do the steps
below.
The Low Voltage Power Supply has a thermal cut-out circuit. If the fan is
defective, the Low Voltage Power Supply shuts down when it gets too hot for
safe operation.
a Disconnect the fan cable from the power supply.
b Measure the fan voltage at the connector on the power supply.
See figure below for location of fan connector. If the fan voltage is
approximately +8 Vdc, replace the fan. If not, replace the power
supply.
Low Voltage Power Supply fan connector location
fan connector
Figure 4-6
Service
Troubleshooting the Oscilloscope
4–36
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