How do I connect a Yamaha PSR 60 portable keyboard to a HI FI speaker system?
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This cannot be connected directly to a speaker system. Any outlets will need connecting to an amplifier then to speakers. – Tim Jun 9 '20 at 5:48
There is a manual for this keyboard available at http://www.synthmanuals.com/manuals/yamaha/psr-60/owners_manual/psr60e.pdf. This is the relevant page (pg 23); you can see that you can use an RCA cable (the one with red and white ends on it) to connect to a stereo system.