Re: SRP51/SRP52 problem
Hi Geoff & Andrew,
Thanks for both your replies. Ah, this issue of measuring the quiescent current has cropped up in many earlier posts. The recommended method to measure it in this circuit according to the service book is to measure across the two resistors (whilst in circuit with power on and volume control at minimum), and aim for the indicated current to be between 9.25 & 12µa. I have 8.8µa. Someone posted the service manual page during the earlier debate about this. Others had suggested the measurement to be done via the + rail and TR4 collector, so I will check that too.
It’s the SRP52 (add-on amp) that I’m working on, and to simplify testing I’m using a cd player to test. I’m wondering if there are problems with the smoothing capacitor? If I replace many more components the only original left will be the circuit board!
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