58 S-Series Oscilloscopes Service Guide
4 Troubleshooting
Power Supply Troubleshooting
This section provides information to help you isolate the problem to the assembly
level when the power system is not operating properly.
By looking at the pattern of LEDs on the acquisition board, you can determine the
cause of the fault.
To locate the LEDs, look through the rear fan slots in the upper right corner as
viewed from the rear of the oscilloscope. After a power fault, the oscilloscope will
restart. The LED pattern will illuminate briefly.
SHOCK HAZARD! The maintenance described in this section is performed with power
supplied to the oscilloscope and with the protective covers removed. Only trained
service personnel who are aware of the hazards involved should perform the
maintenance. Read the safety notices at the back of this guide before proceeding.
Failure to observe safety precautions may result in electric shock.
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