A2 Power Supply; A3 Fan Module; A4 Mother Board - Keysight Technologies X Series Service Manual

Troubleshooting

A2 Power Supply

The power supply has an internal line fuse that cannot be replaced. If the fuse opens, the power
supply must be replaced.
Voltages
The main power supply is a switching supply designed with an automatic line-
voltage and frequency selection. The supply has a maximum total output
power draw of 450 watts. The supply converts line voltage (120 Vac or
240 Vac) to regulated DC voltages. All A2 Power Supply outputs, except for the
+5VSB (standby- supply), are over- current protected and will not be damaged
if a continuous short circuit occurs. Also there is over-voltage protection; it will
shut down if exceeds required voltage.
Power Supply Interface Assembly is a post regulation switched mode power
supply which converts +12VDC @ 50A to the following output voltages,
+32VA, +15VA, +12V, +9VA, +5VA,+5V_REF_OCXO_SW, +5V_STBY_SW,
+5VREF Voltage, +2.5VD Voltage, +1.2VD Voltage, -7VA, -15VA and Fan
Power (vary from 5.9VDC to 14VDC). There is a FPGA providing sync signals
and ABUS for these suppliers.
Power Supply Thermal Sensors and Fans
Two thermal sensors prevent the signal generator from overheating. One
sensor is internal to the A2 Power Supply; the other sensor is in A12 DAC
Board.

A3 Fan Module

There are four fans in the instrument. They are variable speed fans that
increase and decrease in speed to regulate the instrument's internal
temperature. For reliability, it is important to operate the instrument with the
covers installed to ensure proper airflow and cooling.

A4 Mother Board

The Mother Board routes power supplies from the A2 power supply and
provides communication data lines to the A1 front panel, A10 Midplane, and A5
Infrastructure boards.
Keysight Agile Signal Generator Service Guide 9