Hello,
I recently bought a disk on ebay that contained both the operational and service manuals with the latter being more important as it wasn't on the list of manuals. As said in the title, it is the service manual for the JVC HR-S7600U as I have that VCR. I decided to put the manual here as it was not on the list of manuals.
So enjoy
(The ebay seller has other CDs for different VCRs so here is the listing, though the seller does not accept returns...
https://www.ebay.com/itm/Service-man...-127632-2357-0 )