76
6000 X-Series Oscilloscopes Service Guide
4
Troubleshooting
If +12V is not present:
a
Turn off the oscilloscope.
b
Disconnect the power cord.
c
Verify the continuity of the wires on the cable from the power supply to
connector J102.
•
If the cable is good,
replace the power supply
.
•
If the cable is bad,
replace the cable
.
If the voltage measured is out-of-range,
replace the power supply
.
If +12V is present but the fan is not spinning, the problem is either the fan or the
FAN_PWM_DRIVE control from the acquisition board.
Table 20
Fan power
Supply
Test Point
Expected Value
If Good
If Bad
VP12V_FAN
Connector J104, pin 1
Connector J102, pin 1
+12 V
Indicates power
supply is good.
Indicates power supply is bad or
cable from power supply to power
board connector J102 is bad.
VP12V_FAN_RTN
Connector J104, pin 4
Connector J102, pin 2
0 V
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