Thanks as always Blu_Fuz. I'm looking forward to opening up my M90 (after my telefunken, see below). Hopefully it is just a belt. What's odd is that the "tech" I used in Berkeley CA (~3 months ago) said he changed all the belts. If he did...he didn't do a good job obviously. It is just odd to me that all the other deck functions still work. I also never realized that both spindles can be operated simultaneously.....I thought the motor only drove a single spindle and the other just moved "in-sync". But it makes sense that the M90 motor should drive both spindles as the "broken" spindle is completely locked up and won't even turn if I use my fingers.
So I said I was going to try to open my telefunken studio, and I started today!! I opened every bolt I could find (and got all the knobs off with allen wrench). The face would not open. It is only stuck at the right, middle, side of the box (just to the right of the volume knob). All other parts of the face want to come right off. Since it wasn't happening I then opened up the back of the box. I tried a few different bolts from the back...but nothing helped. I took a few pictures. Anyway you can tell where this mystery bolt is so I can get the face off? The manual I have doesn't help with this.
Also, see those two fuses? If I replace them, should the lights work? I ask because the battery meter light doesn't work. It would be awesome if that's all I need to do to fix.
Ohhh...and the reason I opened up is to LEARN and to replace the belts. The cassette deck is playing SLOWWWLLLLLYYYYYY. I'm hoping this is more difficult then my Toshiba RT-8290S or Prosonic box...because they were easy!
Thanks for the information as always!!!