Specifications

Chapter 4: Troubleshooting
Power Supply Troubleshooting
54
Locate the other two groups of over- voltage fault LEDs along the edges of the two
acquisition assemblies. They are visible through the bottom fan opening located on the
left side of the oscilloscope, nearest the rear panel (see Figure 4- 7 and Figure 4- 8).
Figure 4-7 Over-voltage indicator LEDs on acquisition assembly behind fan
Figure 4- 8 shows the fan opening with the fan removed. You do not need to remove
the fan to diagnose a problem; you can see the LEDs through the fan.
Figure 4-8 Over-voltage indicator LEDs with fan removed
The acquisition assembly nearest the bottom of the oscilloscope is the channels 1 and
2 acquisition assembly (LOWER ACQ) and the one above it is the channels 3 and 4
acquisition assembly (UPPER ACQ). If you look through the fan and see any of the
over- voltage LEDs lit, that acquisition assembly needs to be replaced.