Specifications

Chapter 4: Troubleshooting

Power Supply Troubleshooting

LED Type of Fault What To Do

AOT0* Over-temperature Replace acquisition assembly 4

AOT1* Over-temperature Replace acquisition assembly 4

AOT2* Over-temperature Replace acquisition assembly 3

AOT3* Over-temperature Replace acquisition assembly 3

AOT4* Over-temperature Replace acquisition assembly 2

AOT5* Over-temperature Replace backplane assembly 2

AOT6* Over-temperature Replace backplane assembly 1

AOT7* Over-temperature Replace acquisition assembly 1

AOV0 Under-voltage Replace acquisition assembly 4

AOV1 Under-voltage Replace acquisition assembly 3

AOV2 Under-voltage Replace acquisition assembly 2

AOV3 Under-voltage Replace acquisition assembly 1

AUV0 Over-voltage Replace acquisition assembly 4

AUV1 Over-voltage Replace acquisition assembly 3

AUV2 Over-voltage Replace acquisition assembly 2

AUV3 Over-voltage Replace acquisition assembly 1

BOV0 Over-voltage Replace assembly indicated by

illuminated AUV0 or FBS LED

BOV1 Used for internal testing

purposes only

N/A

BOV2 Any Any problem that causes a

shutdown also turns on this LED

BOV3 Used for internal testing

purposes only

N/A

BOVG Over-voltage Replace backplane assembly

BSF Over-voltage Replace backplane assembly

FBS Over-voltage Replace backplane assembly

FLT Over-voltage Replace backplane assembly

*If an AOT LED is Lit

If the oscilloscope shuts down and the AOT0, AOT1, AOT2, AOT3, AOT4, AOT5, AOT6, or

AOT7 indicator LED 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 fans 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.