HK Service Manuals available for download
It seems that Harman Kardon has their service manuals (not just owner's manuals) on the internet, although they don't post links to them. Here's how I found mine (an AVR40):
Go to the HK website, http://www.harmankardon.com/, and go to the support page, where you find the link to the owner's manual. For example, mine is:
http:// manuals.harman.com/HK/Owner%27s%20Manual/AVR40%20om.pdf
Note that I've put a space at the beginning of the URL so the forum software won't turn it into a link. To find the service manual, replace the "Owner%27s" (Owner's) with "Service", and change the end of the filename from "om" to "sm". Talk about a lucky guess!
To continue the example, my service manual is found at:
http:// manuals.harman.com/hk/Service%20Manual/AVR40%20sm.pdf
The two differences are the subdirectory ("Service%20Manual" instead of "Owner%27s%20Manual"), and the end of the filename ("sm" instead of "om"). Of course, I can't guarantee that all HK products will be there, but I did test out the HK3380, a current HK receiver, and voila - there it was! Thanks to this trick, I was able to figure out what the problem was with my receiver, and didn't have to spend hours tracing signal paths.
Go to the HK website, http://www.harmankardon.com/, and go to the support page, where you find the link to the owner's manual. For example, mine is:
http:// manuals.harman.com/HK/Owner%27s%20Manual/AVR40%20om.pdf
Note that I've put a space at the beginning of the URL so the forum software won't turn it into a link. To find the service manual, replace the "Owner%27s" (Owner's) with "Service", and change the end of the filename from "om" to "sm". Talk about a lucky guess!
To continue the example, my service manual is found at:
http:// manuals.harman.com/hk/Service%20Manual/AVR40%20sm.pdf
The two differences are the subdirectory ("Service%20Manual" instead of "Owner%27s%20Manual"), and the end of the filename ("sm" instead of "om"). Of course, I can't guarantee that all HK products will be there, but I did test out the HK3380, a current HK receiver, and voila - there it was! Thanks to this trick, I was able to figure out what the problem was with my receiver, and didn't have to spend hours tracing signal paths.
(less than 1 year old, 1 owner, originally from an authorized dealer) from a private individual locally, but my gut tells me that I am not getting all my questions answered properly 
....So, with your help I would like to...
