No power at all? Or it powers up, but then shuts down when a cassette is loaded?
Have you measured the outputs at the power supply?
If you get absolutely nothing at any of the outputs the problem is probably on the primary side. The last one I had with this fault it was a failed switcher IC that also took out a couple of resistors.
If you get readings that are lower (but not zero) than they should be (usually printed on the board near the power connector) you probably have some bad caps in there. Any that are bulging/leaking are bad. They can be bad and still look okay, so if you don't have an ESR meter to test them it may be easier to replace them all.
If one or more supply rails read 0, but others are okay check the diodes/regulators for that rail. I have found the 3 terminal regulators dry jointed in these before. Shorted diodes are also fairly common.
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