Reply To: Beocord 9000 Low Volume on Playback

#8463
Glitch
BRONZE Member
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For IC101 and IC201 the pin voltages are the same

Pin28 – 13.51v

Pin5 – 0.040v (play)      0.027v (stop)

To check for the signals, I’m using the tape with the recorded calibration tones. This makes it easy to distinguish a signal from the background noise.

The plot below is the Pin4 input for the left (top/yellow) and right (bottom/magenta) channels

Dolby_Pin4_L_R

Here is a close-up of the Pin4 left channel with some measurements.

Dolby_Pin4_L_zoom

Glitch