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Generally either inside the drive motor or on the circuit board where the motor draws it's power will be a speed preset. You can adjust the speed of any deck with this. If it's on the motor you will see on the underside of the motor a small slot. Inserting a screwdriver in that should adjust it. Sometimes a sticker has been placed over the speed slot to prevent people fiddling with the speed.
Is this a big bass hum? Are you in the USA? These are all mostly pretty old units by now but pro equipment none the less. It's got circuitry problems but may be worth repair as I'm not sure anything like this is made anymore.
thats the hard part, if the fuse slows then how to locate the short , they make a short finder but its over $200,00, replace the fuse with a test light then start doing a visual inspection , look for any frayed or koose wiring that may have chaffed
Disconnect the yellow wire from the thermostat and tape off the end. Turn the power back on. If the fuse blows, it is not in your wire nor the compressor contactor. If the fuse does not blow, turn off the power, reconnect the wire, and replace the fuse. Then, disconnect the wire from the compressor contactor and tape it off. Turn the power back on. If the fuse blows, it will eliminate the compressor contactor coil and will likely be a "short" in the wire itself. The yellow wire goes from your T-stat to your air handler and from your air handler, it goes to the oudoor unit's compressor contactor.
Change out your ACC Relay. It is located on drivers side behind kick panel in fuse box. It is Black and rectangular shaped. Check for moisture. Many times water comes off driver door Chanel right into fuse box. Open driver door look for holes in front panel. ACC Relay is under 10 bucks at auto parts store.