Agilent Technologies 8564EC Service Manual page 375

Spectrum analyzers

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Cal Oscillator (P/O A4 Assembly)

5. Vary the volume and listen for the variation in speaker output level.

Clipping is normal at the highest volume levels.

6. If the audio is not working correctly monitor the signal at A4U704

pin 3 with an oscilloscope. The signal should be 20 mV peak-to-peak

±25 percent (with +2.5 V of dc bias). If the signal measures outside

these limits, the fault is prior to the audio ampliﬁer (block T).

7. If the signal is correct, troubleshoot the audio ampliﬁer and speaker.

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