Keysight M9502A, User Manual

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Keysight M9502A/M9505A AXIe Chassis User Guide 113
Troubleshooting Troubleshooting and Service
–
The breaker handle releases spring pressure.
–
After a slight delay, you should hear a soft click; this is a relay opening in
the PSU. You may not hear this relay open, due to PSU fan noise.
– The front panel power switch may light briefly, then extinguish.
– The two PSU fans will turn off.
Chassis Hardware Troubleshooting
Chassis Fans
If module loads are kept within the 200W per slot rating and adequate ventilation
is provided around the chassis, the chassis fans are designed to automatically
cool the chassis. If the chassis powers up properly, the fans should be turning at
all times, with speed in proportional to thermal load.
There are a few reasons you may suspect a fan tray failure:
- One or more fans does not turn.
- A fan makes excessive bearing noise.
- You observe reduced speed for one or more fans relative to the others.
- One or more fans do not behave as described in “Normal Chassis Operating
Behavior” on page 111.
-
You experience an overheat condition, whether detected by the chassis
Health Monitor, module monitoring software or other means.
In the event you experience unacceptably high chassis or module operating
temperatures or other indications of fan failure, follow the procedure below.
To Check Chassis Fan Operation
In the event you experience unacceptably
high chassis or module operating temperatures, or other indications of fan
failure, follow the procedure below.
1
Visually check that all three (M9502A) or six (M9505A) fans are turning. If any
fans are not turning, check for and remove obstructions. If there is evidence of
excessive buildup on the fan blades, remove the fan tray to clean and reinsert
it (see
page 124 ), and recheck. If any fans still do not turn, replace the fan
tray. Else continue.
2
Using the Web Interface, access the Chassis Health page. In the Sensors
section, each fan is listed individually, with real time speed in rpm.
3
The six speeds should be reasonably close. Identify any that turn more slowly
than the group. Any large deviation may indicate reveal early signs of fan
failure.
4
Below the fan speed readouts are your fan settings. You may set a higher fan
speed to see if the fans are responsive.