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I’m trying to repair a Beocord 3500. I’ve succesfully repair the mechanical part as now the tape is running fine (play, ff and rev). But I’m stuck with no audio output.
I’ve checked with my oscilloscope while playing a tape. I can see audio L/R going out of the tape heads to the P.B amplifier L/R (DIAGRAM A AF and control). I have audio signal on pin 7 and 14 (input) of the Dolby decoder chip IC1 (LM1131) but nothing out of it (pin 9 and 12). DIAGRAM B
Also the digital vumeter is full lit all the time when I press play.
I’ve swapped the LM1131 with a brand new one with no more luck.
I’ve ran out of idea on this. Any help will be much appreciated
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