Agilent Technologies 8935 Series Especificações descarregar pdf (Página 57)

56 Chapter 3

Troubleshooting

Self-Test Diagnostics (Step 1)

Reading LED Codes

When the self-test diagnostic reports a failure, more information about

the failure may be available inside the Test Set. This additional

information is output to the four LEDs on the top of the A2A31

Controller assembly. The failure codes are sent out as code sequences.

Figure 3-7 on page 58 and the tables following it document some of the

more useful code sequences. You may need to run the Self-Test

Diagnostic several times to decode a particular LED sequence.

NOTE

The LEDs output self-test diagnostic codes only when the Test Set is

powering up. The LEDs remain off when the self-test diagnostic is

initiated through programming or when running the functional

diagnostics. To read the LED codes, the Test Set’s cover must be

removed.

If the Test Set has no faults that can be detected by the Self-Test

Diagnostic, the four LEDs on the Controller assembly will light and

remain on for about ten seconds. During that period, a short beep will

be heard. Then the LEDs will extinguish and remain off.

If a fault is detected during the test:

1. The four LEDs will go on for about four seconds.

2. The LEDs will blink a failure code which corresponds to the error

listed in Table 3-1 on page 55. Figure 3-8, "First LED Patterns," on

page 59 shows the blinking LED codes.

3. Two non-blinking LED codes will follow. The interpretation of these

codes depends on the preceding blinking code. Two sets of the

non-blinking codes are listed: see Figure 3-9 on page 60 and Figure

3-10 on page 61.

4. If there is more than one failure, the test will loop back to step 2 and

repeat until the last failure is reported.

1 2 ... 52 53 54 55 56 57 58 59 60 61 62 ... 342 343

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Agilent Technologies 8935 Series Especificações Página 57