I have three items which fall under this head.
Firstly, I have a Pioneer LD-V8000 LaserDisc player which has had certain modifications made to it. The previous owner had a plan to add a digital audio output, which requires replacing one large surface-mount IC with a variant which differs only by one pin, & then populating some traces which are on the board but unused. He actually gave me the necessary parts, & a complete set of manuals & documentation in the form of scans. All I really lack is the confidence to do the job!
Secondly, I have a Sony HIL-C2EX Hi-Vision LaserDisc player which needs a serious optical-system adjustment. It misbehaves when reading discs. I have the Japanese service manual, & the American service manual for a related model (which may not actually exist), as well as two spare optical blocks. What I don’t have is the adjustment jig called out in the manuals, which is a fairly simple ribbon-cable/PCB combination to bring certain test points out to a convenient location. I am really hoping to locate a schematic of this, if I can’t get the jig itself. I also have a second unit of the same model coming from Japan, which doesn’t power up — we will see what its problem is in due time. I do want to add an AC-3 RF output point (for Dolby Digital audio on NTSC LD), if possible.
Thirdly, I have a Pioneer PD-707V Compact Disc player with LaserDisc-type video format playback capability, for the small number of “Compact Disc Video Singles” and “Video Single Discs”, containing 5 minutes of LD format video on a CD-type disc, with optional CD audio tracks. This is useful because neither the LD-V8000 nor the HIL-C2EX plays the 12 cm disc size. Currently it doesn’t recognize that a disc is loaded in the tray, & I don’t think the laser is lighting. Maybe the optical block is bad, maybe it’s something else ; I need the service manual for this one. Because it is one of those models which time-shares a single DAC chip between the two channels, I also want to add a digital audio output ; I think I can find space for this by removing the useless-to-me Japanese-standard VHF sound-&-vision modulator.
So, do you have anything like this?