Do you think something needs to be replaced or does it just need to be re-calibrated? I tried starting at the beginning of the trouble shooting in the service manual and it instructs you to:
1. On the Audio Analyzer, key in 41.0 SPCL to initialize the instrument. Set the INPUT and OUTPUT switches
to ground. Set IMPEDANCE to 600R. Key in AMPTD 3 V. Connect the HIGH OUTPUT to the HIGH INPUT
through a tee adapter.
2. Connect a high-impedance, ac coupled oscilloscope to the tee at the HIGH INPUT. Use the oscilloscope’s
vertical gain controls to adjust the display amplitude for 5 divisions peak-to-peak deflection of the sinusoidal
signal. (The period of the signal should be 1 ms.)
3. Connect the oscilloscope to A2TP5 (SING END). Key in the Special functions listed in Table 8B-4. For each
setting, increase the oscilloscope’s vertical gain by the amount indicated. The peak-to-peak amplitude, displayed
on the oscilloscope, should be within the limits indicated. If faulty, see Service Sheet 1 and check the High Input
Attenuator.
Now I'm new to using an oscilloscope so I'm pretty sure I'm doing it wrong, I set it to auto scale and to a/c coupling and when I punch in V ampl measure channel I get 8.18 V so I tried V max and got 4.14v but according to the chart it's suppose to be between 4.9 and 5.1 amplitude limits (divisions peak to peak)
So if I'm making a stupid mistake in my settings please correct me.