You’re telling us of having NO volume control action is certainly suggestive of your problem being in the AF output stage. Initially, can you confirm for us, that you have the full operational DC supply voltage at pin 5 of the IC551 AF out?Īlso, can you confirm that IC 502 is properly receiving a proper +6 vdc at its pin 8? Originating, all the way from its point of origin over at pins 11/12 and 9/10 as the analog R and L audio outputs at the Digital Analog Converter IC. I just prepped up the block diagram, as it seems to have all referencing output to the audio flow thru the system.
Since you now say that full familiarity with your equipment’s normalcy in the past, now confirms that the present volume is 1/2 or less than it used to be, therefore you remember that level as a reference of its prior capabilities.
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