Keysight N9038A, Service Manual, Page: 51 / 745

Keysight N9038A MXE Service Guide 51
Boot Up and Initialization
Potential Problems During Boot Process
6. With the instrument turned off, and the AC power cord removed, remove
the Fan Assembly including unplugging all fans from the A8 Motherboard.
Refer to Chapter 18, “Assembly Replacement Procedures”, on page 527 in
this manual.
7. Turn the instrument power back on and measure the fan voltage at all
three of the fan connectors (J6, J7, & J8) on the A8 Motherboard.
Each connector has three pins. The outer conductors on all connectors are
the FAN_P supply and the center conductors are FAN_N. The voltage
between FAN_P and chassis ground should be b7 and +15 VDC
on all three connectors.
Does the A8 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 not:
After verifying that the connections between the A7
Midplane board and the A8 Motherboard are mechanically
and electrically secure replace the A8 Motherboard.