Keysight Technologies Infiniium MSOV 084A, Руководство по обслуживанию

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Troubleshooting
4
Infiniium V-Series Oscilloscopes Service Guide 65
If the L-ACQ TEMP FAIL or U-ACQ TEMP FAIL LED is lit
If the oscilloscope shuts down and either the L-ACQ TEMP FAIL or U-ACQ TEMP
FAIL indicator LEDs is lit, then one of the scope channels is getting too hot or the
temperature sensing circuitry has failed. Normally, you would have to turn the
oscilloscope on and leave it on for awhile before you would see a shutdown caused
by temperature problems. If all the fans are turning, it is unlikely that the
oscilloscope would shut down due to temperature unless the airflow is being
restricted or the input air is already too hot to cool the insides of the oscilloscope.
It is possible that all the case fans and the trigger ICs are working, but the
oscilloscope still shuts down because of temperature due to one or more of the
channels malfunctioning and drawing too much current. If so, you would need to
replace the indicated acquisition assembly. It is also possible for one of the heat
sinks on one of the acquisition assemblies' critical parts to become detached and
cause that part to overheat and shut down the oscilloscope.
Table 3 LEDs on each acquisition board
LED Typs of Fault What To Do
U1101 oV Over-voltage Replace acquisition assembly
U303L oV Over-voltage Replace acquisition assembly
U1600 oV Over-voltage Replace acquisition assembly
U1100 oV Over-voltage Replace acquisition assembly
U300 3.3 V oV Over-voltage Replace acquisition assembly
U300 2.5 V oV Over-voltage Replace acquisition assembly
U303R oV Over-voltage Replace acquisition assembly
U1601 oV Over-voltage Replace acquisition assembly