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Its also possible the pinch roller rubber has hardened so that it can no longer conform to "wrap" enough of the tape area evenly over the spinning capstan shaft for positive drive. It's a common problem especially these days. Extra pressure may temporarily gets things going but the best solution is a new pinch roller or at least new rubber tyre. Not saying this is the only problem but it may be a factor. These days some sellers are offering new pinch roller wheels or tyres for some models but they may no longer have access to the hardness specifications for the original factory rubber part. But that's another story. Sometimes if the correct replacement is no longer available, the outer layer of hardened rubber can be carefully sanded or lathed off , revealing a better surface underneath, but it can be tricky to do well and not always successful.