Peavey, a music equipment manufacturer specialising in amplifiers and electric guitars, currently produces three guitars in the EXP generation: "Raptor EXP", "Predator EXP" and the "JF EXP." Peavey markets this generation of guitars as versatile and a good value for money. If the intonation on your Peavey Generation EXP guitar is off, it can be difficult to accurately tune the strings. While the open strings may be in tune, once you fret a note, the difference in string intonation causes some frets to sound sharp, despite the string being in tune. You can fix the intonation by adjusting the bridge saddle.
Plug your Peavey EXP into a chromatic guitar tuner. Turn the volume dial fully up to ensure that tuner is receiving as strong a signal as possible. Strike the bottom E string, and observe the display on the tuner. If the dial is left of centre, tighten the string. If the dial is right of centre, loosen the string. If the dial is centred, the string is in tune and no tension adjustment is required. Repeat this process for each string. Depending on the type of tuner you have, you may need to manually set it for each string. Most modern tuners automatically detect the pitch and recognise which string is being tuned.
Play the bottom E string at the 12th, which is one octave above the open string. Observe the tuner reading. If the dial is not hitting the centre, the intonation is out. On a correctly intoned guitar, the open string note and the 12th fret note register exactly the same reading on a chromatic tuner. Make a note of whether the 12th fret is sharp (right of centre) or flat (left of centre).
Adjust the position of the bridge saddle. Intonation is linked to the "vibration length" of a string. The "vibration length" refers to the portion of string that isn't restricted by the nut or the bridge. If your string was flat at the 12th fret, decrease the vibration length by moving the saddle forward. Insert a small, Phillips screwdriver into the screw just behind the saddle, and turn it counterclockwise.
Turn the saddle screw clockwise if the string is sharp at the 12th fret. The Predator model has a Floyd Rose. Use a hex key instead of a screwdriver to perform the saddle adjustment. Repeat this step for each string. The heavier strings require greater adjustment than the lighter strings.
If adjusting the saddle doesn't work, try a new set of strings. Dirty strings often can sound out of tune when fretted.
Make very small saddle adjustments because loosening too much causes the saddle to become loose and creates a buzzing sound.