HP Switch E42 Manual do Utilizador descarregar pdf (Página 97)

Model 5328A

Maintenance

5-33. IC Troubleshooting

5-34. To troubleshoot the IC’s on the A1 Motherboard, proceed as follows:

Set the FUNCTION switch to CHECK.

b. Set the FREQ RESOLUTION, N switch to 1 MHz, 1.

Remove top cover and remove A4 Function Selector Assembly.

d. Apply power and check for the logic states as shown in Table 5-5, using an HP Model

10528A Logic Clip or a Model 10525T Logic Probe. A dark pattern indicates a logic high.

5-35. Function Signals

5-36. Table 5-6 lists the functional signals at pertinent points for each position of the FUNC-

TION switch. This information can be used to isolate problems that may occur in any of the

various modes of operation.

5-26

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HP Switch E42 Manual do Utilizador Página 97