Chapter 1 27
Troubleshooting
If the Fans Are Not Operating
If the Fans Are Not Operating
CAUTION The power supply may be in thermal shutdown if the instrument has
been operating without the fans running. Allow the instrument to cool
down before troubleshooting.
If all three fans are not operating, suspect a power supply problem or
defective A14 fan control board. Refer to “Power Supply Check” on
page 34 to check the individual supplies. If the supplies are within
specifications, the most probable cause is a defective A14 fan control
board. Refer to Chapter 3 for assembly replacement procedures.
If only one or two fans are not functioning, and the power supplies are
within specifications, suspect the A14 fan control board or a defective
fan.
1. Remove the front frame from the instrument. Refer to Chapter 3 for
removal procedures.
2. Refer to Figure 1-2. Measure all of the fan voltages at J1, J3, and J4
on the motherboard.
Figure 1-2 Fan Voltages
3. If the correct voltage is present and the fan connector is in good
mechanical condition, suspect a defective fan. Refer to Chapter 3 for
assembly replacement procedures.
4. If the voltage is not present, suspect a defective A14 fan control
board. Refer to Chapter 3 for assembly replacement procedures.
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