Keysight N9000A Service Manual page 54

Boot Up and Initialization Troubleshooting
Potential Problems During Boot Process
Before replacing the power supply, verify the midplane and motherboard
NOTE
interconnects are mechanically secure.
Figure 2-5 A6 Midplane Board - Fan LED
A9, L.O. Board
plugs into J21
A5, Power Supply plugs
into J101 and J102
A3, CPU Assembly plugs into
J201, J202, J203 and J204
6. With the instrument turned off, and the AC power cord removed, remove the
7. Turn the instrument power back on and measure the fan voltage at both of the
54
Fan Assembly including unplugging both fans from the A7 Motherboard. Refer
to Chapter 13, "Assembly Replacement Procedures," on page 225
manual.
fan connectors (J6 & J7) on the A7 Motherboard.
Both connectors have three pins. The outer conductors on both connectors are
the FAN_P supply and the center conductors are FAN_N. The voltage between
FAN_P and chassis ground should be between +7 and +15 VDC on both
connectors.
Does the A7 Motherboard fan connector for the fan(s) that do not work have
the required voltage level?
If yes:
Replace the fan(s) that is not working
If no:
After verifying that the connections between the A6 Midplane board and the
A7 Motherboard are mechanically and electrically secure replace the A7
Motherboard.
in this
Chapter 2