HP Cable Box 8591C manual If the analyzer measurements appear inaccurate, Cqnf Test

If You Have a Problem

Before You Call Hewlett-Packard

If the analyzer measurements appear inaccurate

If it appears that the cable TV analyzer measurements are inaccurate the cable TV analyzer correction factors may have been removed from the measurement results. If this occurs, perform the frequency and amplitude self-calibration routines given in “Turning on the Analyzer for the First Time” in Chapter 2. After running these routines, press CAL STORE , then perform the conEdence test.

Perform the conEdence test by pressing the following keys:

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CQNF TEST

The cable TV analyzer performs a self-test by cycling through its major functions. The confidence test is performed within 1 to 2 minutes.

If the unit does not function properly, messages appear on the screen. See “Error Messages” for explanations of error messages.

If error messages appear, record the messages and refer to the cable TV analyzer service guide or contact the nearest Hewlett-Packard Sales and Service Office listed in Table 8-l.

If the error message FREQ UNCAL stays on screen

Perform the frequency self-calibration routine by pressing CAL FREQ , wait

for the routine to complete, then press CAL STONE .

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