Dunno, Dries . . . is the short answer! I must look at this! Thanks for the suggestion. I must enlarge that page so I can read it. Fortunately I have the other Dell to do just that - but it doesn't print. Michael Studio1 UK 12:29BST
The Schematic of IC801 given on page 168 is incorrect, Dries. I have been railing about this for some time. To check this, compare it to the IC801 pinout on page 114 - and you'll see what I'm railing about!! Michael Studio1 UK 12:34BST
Hello 73's de Edd - great to have you involved again. Your annotations with Green, Red and Blue arrows is extremely helpful in understanding this IC801 - which is an extra-ordinary complex issue - made so, I think - by the fact that the picture with pin numbers on page 168 (which you annotated) in no way coincides with the Cct.Diag. on page 114 - which I have enlarged and placed next to page 168 in my copy of the Service Manual - for comparison purposes. I did this several months ago and was non-plussed by the differences. Your reference to 'page 129 pin assignments of that IC 801' seems that Adobe has gone mad - for that page (129) shows SCHEMATIC DIAGRAMS (24/26) - DIGITAL CNT - or what am I missing here please? I looked yesterday at Pages 33-34-35-36-37-38-39-40 and 41 and concluded this illustrated the switching arrangement automatically made on operating the 'SOURCE SELECT' knob on the front of the machine. I haven't come to grips with pages 88-89-90-91 and 92 yet - and am not sure whether my knowledge stretches that far (to be honest!) I am trying to firmly establish what happens to the Signal Tones I am injecting at the CD inputs, arriving at pins 75 and 76 of this IC801 (page 114 version!). Are they 'switched'? do they emerge still Analog - if so, where? Or does the IC801 have an AD Converter inside it? I must study your Annotations with arrows to see if this tells me. I do not (I think) have the appropriate test equipment to trace a Digital Signal - unless my hand-held Oscilloscope can be deemed such! I look forward to your deliberations on these issues! Michael Studio1 UK 5.May 2018@ 07:49BST
Thank you Dries. There is one unfortunate thing - I cannot enlarge your attachment sufficiently to allow me to scrutinise and compare it to the two R2A15218FP's in the Service manual for the AVR-1912E2/EA. Strangely 73's de Edd seems to be of the opinion that the page numbers in this Service Manual are to be attributed to ADOBE and not to Denon (if I read his post correctly):-"If you refer to the Denon documents ADOBE assigned page # 129 it will list IC801's part number . . . .which is actually being a R2A15218FP integrated circuit . . . . and the assignment of its pin numbers , along with their names and descriptive function."
Indeed it is better - Readable in fact!. But I was saying (a-propos 73's de Edd marked up IC801) the RED output pins are: 53 & 54 - which, in the IC801 version on page 114 are designated 'NC' and A/D_L whereas in that same drawing of IC801 on page 168 (the one used by 73's de Edd) pins 53 and 54 are designated 'ADCL' and 'ADCR' which makes a lot more sense. I hope you're following this verbiage? Michael Studio1 UK 19:00BST 05-05-2018
Thanks Dries - answer: No, Not yet. But I have been out all day soaking up the sun at Kew Botanic Gardens country Estate in Sussex: 'Wakehurst Place' Lovely. I haven't turned on the AVR at all today. Michael Studio1 UK 19:10BST 05-05-2018
