Hello Oldway. There's been a minor hiccup here in the Workshop when I found the ceramic cap in my probe had broken and needed replacing - which I did successfully using a 2.2Mfd 50v, electrolytic (NEG towards the amplifier unit)
I have resurrected an 'Endoscope' with 6 led's around the lens and probing with my Sound Probe. Great strain on the eyes, the endoscope, as the points of interest are so small as to defy numerical recognition. I can't quite see the fine point on my Probe to be sure which of the IC801 contacts it is touching. I have mounted the endoscope on one of those weighted alligator clipped, magnifying glassed bench third hand thingies. Otherwise it's akin to watching an amateur video where the cameraman has no notion of s l o w pan and the image dances around as a result. But this way I hope, when I have mastered the technique, to be able to probe the pins 1-30 and 31-50 which cannot normally be seen without dismantling the pcb structure.
I am looking at your Post of 9th. December. You ask: "can you probe pins 2,8,10,14,16,18,22" I am hoping that with this 'Endoscope', and having mastered the technique, I shall be able to do these probes. What shall I be expecting at: SBR OUT(2), SLOUT(
, SROUT(10), SWOUT(14), COUT(16), FLC(18), FROUT(22), (did you also mean to add FLOUT(20) as well?)
I appreciate that this Denonj AVR-1912 is a sophisticated bit of kit - and I'm finding that out the hard way! However it didn't cost much in the first instance and it will be great to have been able - with your help and those of your eev colleagues - to be able to fix it! It is my 20yr. old son's - he's at Guildhall in London on a 3yr. Theatre Technical Course.
I'll get back to you so soon as I am able to give an answer to your pinout questions.
As to an Oscilloscope - what I have hardly warrants the name! It is an inexpensive Chinese hand-held 'DIY oscilloscope kit, which I found on e-Bay. DS201 pro. "Pocket size (7cm colour screen) Open source (whatever that might mean) 200Khz bandwidth, 1Ms/s sample rate, 8M storage, all in an Aluminium Alloy case (and a plush-lined black felt case with a security strap, probe with an alligator GND clip end, a spring-loaded cap (pull it back to reveal the probe end, or take it off entirely) a tiny DIY Allen key. (I can really do some damage with that!) and a mini CD to load the programme on the PC. Michael UK