HP E42 manual Model 5328A Maintenance IC Troubleshooting, Function Signals

Model 5328A

Maintenance

5-33.IC Troubleshooting

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

a.Set the FUNCTION switch to CHECK.

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

c.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.

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