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Chapter 5: Troubleshooting

To check the LEDs

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If you see a failure with the Auto or Trig’d LEDs, check the voltage at pin 6 of W16, with W16 disconnected from the keyboard. The voltage should be as follows:

•0 V ±0.5 V when both LEDs are supposed to be off.

•2.5 V ±0.5 V when Trig'd is supposed to be on and Auto is supposed to be off.

•5.0 V ±0.5 V when both LEDs are supposed to be on.

If the voltages are not correct, the problem may be with keyboard cable W16, scope interface board A6, acquisition cable W11, or acquisition board W13. Try troubleshooting the acquisition system first to verify correct behavior before replacing any assemblies. If the voltages are correct but the LEDs do not light correctly, replace the keyboard assembly.

If you find a problem with the Armed LED, check pin 5 of W16 with the cable disconnected from the keyboard. The voltage should be as follows:

•5.0 V ±0.5 V when Armed is supposed to be on.

•< 3.6 V ±0.5 V when Armed is supposed to be on. Isolation is the same as for the Trig'd and Auto LEDs.

If you find any other failures, replace the keyboard assembly. If the front panel power indicator LED does not light, replace the cursor keyboard assembly.

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