Hello , all . I am new to this forum ,site , and Vintage AUDIO. I bought a new 2285B receiver ect not long after I graduated High School in 1976. I got one of the first production units as I had it before the end of the first semester , of Jr College. But back in now a d my son bought me a somewhat_ Functioing 2270 for Christmas. THE 2270 is a completely different story , but while I was waiting on parts for it, I decided to look for a 2285B . On Ebay , what I wound up with is a 2285BD. It is Nice , really nice ! CLEAN , tone boards , phono boards , Amp Perfect!! BUT the AM radio , Fm 25us , had problems,,and the stereo Lamp was inop. After a fairly intense internet search & checking with Marantz.com I realized that no easily accessibly site had service manuals or schematics for it , the 2285BD. After a quick look at Vintage Audio Site forums , I was like like most of the opinions posted and assumed that it was a close knockoff to and I would be able to use a 2285B and take care oF it. HOW WRONG ALL OF US ARE!!!!!!!!! I was grateful to find and obtain access to Audiokarma.org!! After downloading service manuals of all the equipment manufactured between.1975 and 1985 The closest boards and amps are the 2330B . The AM / FMBoards for all that era are close , probably the same basic components for the 4 IC dual receiver single boards . BUT LAYOUT, LABELING, AND AMOUNT OF FILTERING ARE DIFFERENT AS PRICE AND POWER OUT INCREASE. If anyone has the right service manual , and or schematic PLEASE HELP!!!!