Troubleshooting 4
6000 X-Series Oscilloscopes Service Guide 75
To check the fan power supply
The +12 V fan power comes from the power supply.
The fan speed is controlled by a circuit on the acquisition board. Signal
FAN_PWM_DRIVE comes from the acquisition board and the FAN_TACH signal
returns to the acquisition board.
If the fan is not running, it may be defective. First verify the fan power using these
steps:
1 Follow the instructions in “To prepare for internal assembly
troubleshooting" on page 69.
2 Connect the power cord, and turn on the oscilloscope.
3 Measure the fan voltage at the J104 connector on the power board between
pin 1 (red wire, VP12V_FAN, also J102 pin 1) and pin 4 (black wire,
VP12V_FAN_RTN or fan ground, also J102 pin 2).
Figure 14 Location of the J104 fan connector
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