Analog Mitsubishi Rear Projection Television technology from 1986?
Most repair technicians would refer you to a museum for an archaeologist.
Here's a site from which one can request pricing:http://www.analogalley.com/m_mitsub.htm
Here's a Mitsubishi VS-508R service manual (a photocopy for $25):http://www.mikesmanuals.com/Manuals_Details_943.htm
Here's another xerox copy for $25:http://www.tubemanuals.com/Tube_Details_943.htm
Aside from an expensive old manual, find a handy/electronics friend, have them take the back off the set, and hunt around for something burnt in the power supply, or even a blown fuse (or both). There's not a technician alive that'll need a manual to find a blown fuse.
Back in 1986, they would have used a good old Buss fuse - probably in a fuse holder, but perhaps soldered directly to a discrete component laden PC board.
Here's a way-too-large photo of a Buss fuse (actual size is about 1 inch (2.54cm). From the intact filament in the photo, you can tell that the fuse in the photograph is still good (un-blown).
The condition of fuses can be checked with (a) continuity checker, (b) DMM (Digital MultiMeter), or (c) VOM (Volt OhmMeter). But the fuse must be withdrawn from the circuit before testing with any of the above 3 categories of meters.
Fig 1. Buss Fuse - fuse specs are engraved on the end (barely visible in this photo)
Replace a blown fuse with a fuse with identical specs.
Replacement fuses are available at Radio Shack:http://www.radioshack.com/family/index.jsp?categoryId=2032301