I don't know what the adjustment settings are that you posted, but the speeding up could be the result of the belt in the bottom inside slipped off its spool that acts as a gear for the speeds, similar to gears on a pushbike but they are smooth spools.
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Register (free) at Vinyl Engine and download the service manual. The adjustment you need to do seems fairly simple. You will need a turntable strobe disk to get the the speed right, unless you have perfect pitch.
The thing to do is to check the belt first, then look at things like is there a build up of grease dirt anywhere. Clean up the platter make certain no grease or dirt is the works causing it to slow down.
See also that the motor that drives the belt can turn freely and very easy by hand.
This sounds like a motor speed control problem. It could be either the motor itself or an electronic fault. So unless you know a bit about electronics and know how to use a soldering iron etc, then the answer to your question is no.
Hi. I also have a DP-51F and am experiencing severe problems with tracking. My sense is that the tone arm may be damaged. Would you be willing to sell parts from your turntable if you're not going to repair it? Let me know as I would be interested.