I've got the first two scans done and both are overviews which contain large blocks that refer to another schematic page for a component level schematic of that block. I've put the schematics at
http://home.earthlink.net/~kawcvd/mtr-10_12_schematics/ and I'll maintain this for the foreseeable future. Some parts of the scans are a bit hard to read but they are that way in the original.
The two scans are:
"Audio control assembly" (
http://home.earthlink.net/~kawcvd/mtr-10_12_schematics/audio-control-assy-cb2810a.gif)
"Tape transport Assembly" (
http://home.earthlink.net/~kawcvd/mtr-10_12_schematics/tape-transport-assy-t00250c.gif).
If anyone has an urgent need for a specific schematic, please let me know. The best way to refer to a specific schematic is by part name and number if it's known. On the schematics above, component level schematics are referenced in this manner in the largest type size.
Mark-
I was wrong about the VU lights in that they are powered by 7 VAC (not DC).
Looking over the schematics, I believe the tape lifter solenoid is labeled "shifter sol." on the "tape transport" schematic and is connected to "mother PCB assy" so I'll scan that one next. I'll also put the "power supply hookup pcb assay" and "power supply PCB assy" at the top of the list.