Here are some manuals that were difficult to find, behind a pay/loginwall, or I thought were worth preserving.
Not all of these are exactly user/service manuals anymore. This is pretty much Natalie's PDF Dump For Anything That Isn't An IC Datasheet
Panasonic AG-MD835P User Manual
JVC BR-S500U and BR-S800U Service Manual, Schematic, Parts List
JVC BR-S500U and BR-S800U User Manual (go to page 7)
Technics RS-TR313 Service Manual
Panasonic AG-MD830 Operating Instructions and Service Manual
JVC KD-V6 Service Manual Supplement
Videonics MXPro MX-3000 User Manual
Sima ColorWriter Plus SCW-2 User Manual
JVC GR-SXM930 GR-SXM930U User Manual
JVC GR-SXM730 GR-SXM730U User Manual
Sensaphone 1104 Engineering Specifications
Siemens C515 CMOS MCU User's Manual
Panasonic KX-TA824 Operating Manual
Panasonic KX-TA Console application
Panasonic KX-TA824 voice cutoff patch
Panasonic KX-TA824 Installation Manual
Panasonic KX-TA824 Programming Manual
Soundcraft Spirit Live 4 User Guide
Yamaha MG32/14FX and MG24/14FX Service Manual
Yamaha MG32/14FX and MG24/14FX Owner's Manual
MDE Escort Prism Monitor Service Manual
SPA100 / SPA200 Provisioning Guide
Cisco VG224 Configuration Example
Guidance on CVR Recording Inspection
Sun TCP/IP and Data Communications Administration Guide