5-8
Troubleshooting
To check out the oscilloscope
To check out the oscilloscope
1 Is an interface module connected to the rear panel of the oscilloscope?
If the answer is yes, follow these steps. Otherwise, go to step 2.
a Turn off the oscilloscope.
b Remove the interface module.
c Turn on the oscilloscope, then check for the failing symptom.
d If the failing symptom is not present, replace the interface module.
e If the failing symptom is still present, go to step 2.
2
Disconnect any external cables from the front panel.
3 Disconnect the power cord, then remove the cabinet.
CAUTION USE AN EXTERNAL FAN TO AVOID OVERHEATING COMPONENTS !
If you operate the oscilloscope with the cabinet removed, you must use an
external fan to blow air across the system board. This external air flow is
necessary to cool the heat sinks on the system board. Otherwise, damage to
the components can occur.
4 Connect the power cord, then turn on the oscilloscope.
• If the oscilloscope display comes on after a few seconds, you will need to
check the low voltage power supply. Go to “To check the Low Voltage Power
Supply” on page 5-11. Then return here.
• If, after checking the low voltage power supply, the voltages are within the
test limits, go to step 8. If they are not within the test limits, go to step 6.
If the display did not come on, follow these steps:
a Disconnect the power cord.
b Check to verify that all of the cable connections are secure.
c Check the low voltage power supply. Go to “To check the Low Voltage
Power Supply” on page 5-11.
If the voltages are within the limits go to step 5. If the voltages are not within
the limits, go to step 6.
service.book Page 8 Wednesday, December 18, 2002 8:35 AM
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