No, that's the owner's manual. What ve3nsv wants is the detailed schematics and repair manual the Uniden techs have.
Good luck. Probably the only poster on this forum with access to one of these service manuals would be UPMan, and I doubt very seriously that his employer would look very kindly on him sharing it with us.
I suppose if you're feeling really froggy, you could just open 'er up and trace the circuit back from the tape jack so you can see where to bypass the software on/off setting and splice in whatever component(s) will wipe out that thump. I'm brave, but not that brave - I don't have another 5 bills laying around that I can replace the scanner with if I fry it.