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Type number 8686 and 9687 are the same UK product.
I don’t know what Type 8870 is, but it is not an AVANT 85
If you expand the physical board layout and the drawing you see that the printed circuit track layout is quite different in the area of concern.
Ernst,
Thank you for your feedback and I have to say it is a difficult problem to understanding based on the information we have to date.
Having said that the basic circuit operates otherwise the system would not trigger with the impedance of your multimeter. This leads me to think that we have a high resistance or open ground connection within the auto start circuit.
At the start of this thread you did mention that the unit was dead with no red light and after you put everything back together you got the red light meaning there was some connection made which was previously not made.
I suggest you check all the ground connections that use plug and socket connections particular associated with the auto start circuit. With the power off and your meter set to resistance connect one meter lead to plug 7 pin 2 as shown below and then check all other ground points have a connection i.e. no resistance.
I have gone back again and reviewed everything that has been done to date.
A couple of questions came up:-
- When you use the multi-meter which triggered the relay and you heard music, did the LED go green?
- In the last post where you measured 52 volts was that with signal connected to the RCA socket?
It is clear that the problem is in the auto-start circuit and nothing to do with the relay circuit area.
Going back to where you were testing at D1 you said:-
- Interestingly, with the red probe on the top and the black on the bottom: the relay clicks, the Amp turns on and music can be heard coming from the speakers.
Can you please go back and see if you can reproduce this situation.
