62 S-Series Oscilloscopes Service Guide
4 Troubleshooting
Sequencer Group Faults
Sequencer 1 Group Faults If the fault occurs in the first group of LEDs
(Sequencer 1) then the problem is with the 12 V bulk power supply, the power
cables, or the acquisition board. You should check the power cables first, then the
bulk power supply, and finally the acquisition board. Reinstall any power supplies,
cables, or acquisition boards that turned out not to be the problem.
Sequencer 2, 3, or 4 Groups Faults If the fault occurs in any of the other
groupings, the problem is most likely the acquisition board. If replacing the
acquisition board does not fix the fault, the power cables may be causing the
problem.
Over Temp LED Fault If the Over Temp LED is lit, first make sure the air flow is
not blocked. The oscilloscope must be placed directly on a hard, flat surface with
nothing under it (such as a piece of paper) that could block the vents. There also
must be proper clearance behind the oscilloscope.
If the clearance is adequate, then investigate the fans. If one or more are not
turning, the problem is with one or more of the fans or fan cables.
If the oscilloscope still will not power on after you have followed the required
steps, refer to the “Motherboard Troubleshooting” section in this chapter for more
diagnosis suggestions.
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