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A site where discontinualed schematic diagrams and back dated information can be found on discontinued radios tv's and any electronic equipment can be found. Newer manuals either Service and operating manuals. Radio amateurs should find this site a great source for ham radio equipment manuals. I will return to this site should I need information on any electrical equipment. priced easy to download in a PDF format and print pages need to undertake the repair.
Text excerpt from page 8 (click to view)
Filter Block Since the sound signal from the CPU is a stepped waveform, the filter block is added to smooth the waveform.
CPU MSM6567-15
To mute circuit
Mute Circuit The mute circuit removes noise from the sound signal just before the signal fades away. The circuit detects amplitude of the decaying sound signal by amplifing it by 1000 times, and transistor T6 flows the signal into the ground when the amplitude decays almost zero. +0.5V at the minimum amplitude (no sound) -2.7V at the maximum amplitude Sound signal from filter block