" master switch or rheostat for controling the play speed"
Yepper! Changing that switch will goof it up to extreme, thats called the "mode switch" and it controls the synch of the tape deck. Change that and the tape speed will go to zero.
The red and black wires are either power to the front load motor (if the tape holder has a motor) or a limit switch. If theres no motor on the tape holder, then the drive comes from below the deck and the timing is messed up. If its not pulling the tape out, then the computer thinks the cassette is not loaded.
That fancy state switch should have an index mark, usually an arrow to indicate home position. See if its aligned, the tape holder may be keyed to it.
I lost count of the number of VCRs Ive worked on at several thousand. Some of those Japanese units are absolute nightmares to get back in time, especially Panasonics.
OWners manual wont cover this stuff.
And, speaking of fixing VCRs, heres the magic tip for cleaning heads - use paint thinner (toluene or acetone) and a Q-tip, itll dissolve anything that gets on the head, including grease and tape residue.


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