Service level
This subsection contains information and procedures to help you determine if a faulty power supply is the problem with your instrument. If
replacing the power supply does not fix the fault, you will need to return the instrument to a T
ektronix Service Center for repair, as no other
internal electronic assemblies or modules are user-replaceable.
Check for common problems
Use the following table to help isolate possible failures. The table lists problems and possible causes. The list is not exhaustive, but it may
help you eliminate a problem that is quick to fix, such as a loose power cord. For more detailed troubleshooting, see the Troubleshooting
flow chart on page 31.
Table 4: Failure symptoms and possible causes
Symptom Possible cause(s)
Instrument will not power on Power cord not plugged in.
Faulty power supply.
Defective micro-controller assembly.
Instrument powers on, but one or more fans will not operate Faulty fan power cable.
Fan power cable not connected to circuit board.
Defective fan .
Faulty power supply.
One or more defective point of load regulators.
Flat-panel display blank or has streaks in display Faulty LCD screen or video circuitry.
Equipment required
•
Digital voltmeter to check power supply voltages.
• 0.1 inch spacing 2-pin jumper.
• An antistatic work environment. To prevent electrostatic damage to components whenever you work on the instrument, wear
properly-grounded electrostatic prevention wrist and foot straps, and work in a tested antistatic environment on an antistatic mat.
Maintenance
5 Series Mixed Signal Oscilloscope MSO54, MSO56, MSO58 Service Manual 30
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