44 Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide
Boot Up and Initialization
Potential Problems During Boot Process
Fans are Not All Operating
The four instrument fans are connected directly to the A1 Power Supply. The
fan motors are AC motors, with a DC to AC inverter built into the motor hub.
The control, voltage, and filtering for the fans are integrated into the A1 Power
Supply.
The fan control voltage is a nominal 12 VDC. The control range can vary from a
minimum of 8 volts up to a maximum of 13.8 volts. Using internal sensors, the
control circuit sets the fan voltage to adjust the fan speed to protect the A1
Power Supply and the signal generator.
The A1 Power Supply will function at full output load, up to 25° C, without
raising the minimum fan voltage. The A1 Power Supply may begin to raise the
fan voltage at 25° C and will reach maximum voltage at no lower than 45° C
ambient.
If a single fan is inoperative
1. Turn the instrument off, remove the AC power cord, and then remove the
instrument outer and top inner cover. Refer to Chapter 15, “Assembly
Replacement” in this manual.
2. Connect the AC power cord to the rear of the instrument and turn the
instrument on by pressing and releasing the front panel power switch.
3. Unplug the inoperative fan and one working fan and plug the inoperative
fan into the working fan’s connector on the A1 Power Supply.
Does the inoperative fan now work?
a. If yes, the connector on the A1 Power Supply is faulty. Replace the
A1 Power Supply.
b. If not, the fan is faulty. Replace the faulty fan.
If two or more fans are inoperative
The most likely assembly at fault is the A1 Power Supply. The four fans are
connected in parallel, so if the A1 Power Supply voltage is faulty for one fan,
then by design, the voltage will be faulty for all four fans. Replace the faulty A1
Power Supply.
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