I've never had to work on one of these machines so I can't tell you exactly what you might need to remove to get at the old belt and pulleys it rides on, but usually it isn't too bad of a job. Anyone with some patience and who is comfortable with small tools should be able to change it. Just keep track of what screws came out of where, what other pieces had to be moved, etc. so you can put it all back together. (Camera phones are great...you can take pictures at each step so you can look back.)
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I don't think that's possible, the minicassette won't fit between the spool spindles. You may be able to use a minicassette player, and route its output to the full-sized cassette recorder, though, or to a little transmitter that broadcasts to a matching receiver in the full-sized cassette player.
Generally speaking, there are two reasons this happens.
 tape recorders have to move tape past the record/playback heads at a highly consistent and accurate rate of speed. What makes this possible is a rubber "pinch" or pressure roller and a spinning metal spindle. Tape is routed between the roller and the spindle, and when the recorder is in RECORD or PLAY mode, the roller presses the tape against the spinning spindle, causing the tape to move from the feed reel to the takeup reel. When the pinch roller and/or the spindle become coated with oxide particles shed from old tapes, they get sticky and the thin tape will begin wrapping around one or the other. THE SOLUTION is to get some cotton swabs and rubbing alcohol and clean the oxide (brown from cheap tapes and dark gray from better tapes) from both of these parts.
 many tape recorders use rubber belts and pulleys to turn the feed reel and the takeup reel. If the tiny rubber belt that makes the take-up reel turn is stretched, it will not wind moving tape fast enough, which causes tape to bunch up. If this is the problem (you will not be able to see the belts without removing the recorder's outer case), then you might as well junk the recorder.
If you see that the part of the rubber drive roller that contacts the moving tape has a ring of brown or gray coating on it, you
The culprit on Sony's variable-speed playback units is often the variable speed control itself. Once this goes, there's little that can be done other than Sony repair. And given the age of this product, you may be better off replacing it.
If the beep is immediate when you press the pedal, the unit is not detecting the tape being inserted. One of the switches may be bad. If you are using a HQ music cassette, there are extra notches on the back of the cassette. Cover them with tape.
If the beep is 1 second or more after pressing the pedal, there is a mechanical problem with the deck.
Hi little gink - follow the link below and check under itrm #4 on the first page. If this solves your problem PLEASE rate this as fixed. If you need more help just add a comment and I'll be happy to assist you further. Thanks.