Specifications

Chapter 4: Troubleshooting

LED Troubleshooting

LED Failure During System Start- Up

When power is turned on to the scope, the front panel LEDs should all illuminate

brightly for several seconds, then dim. The RealEdge LED (on 50 and 62 GHz models)

should pulse off and on. When the Infiniium software starts up, the LEDs should turn

off. If the LEDs do not light up this way during system start- up, then follow these steps:

1 Make sure connectors J2 and J3 on the front and rear boards of the keyboard assembly

are securely connected to their mates on the other board.

2 Ensure the power cable is properly connected.

3 Make sure J17 is connected on the rear board of the keyboard assembly.

On/Off Switch Backlight LED Failure During Self Test

If the on/off switch backlight LED is not working, check the on/off cable connecting

the On/Off board to the motherboard. If the LED still does not work, replace the On/Off

board. If the LED still does not illuminate, replace the motherboard.

Front Panel LED Failures During Self Test

If any of the other LEDs on the front panel are not working, check these cables:

• The power cable to the front panel

• The USB cable to the front panel

• The backlight connector (J1) to the motherboard

If the cables are connected and working properly but the LEDs are still not working,

then troubleshoot the acquisition assemblies to make sure they are working. If they are,

replace the front board of the keyboard assembly. If the LEDs still do not illuminate,

reload the oscilloscope software.

Replace the front board of the keyboard assembly in these cases:

• Only some of the LEDs illuminate

• No LEDs and no knobs work

• The knobs work but the LEDs don’t illuminate.

When reassembling the oscilloscope, be sure to reinstall all boards that were replaced,

but that were not causing the problem.