här är en annan sida jag kollat förut:
http://www.weedhopper.org/Music/Bass-Neck-Tilt-and-Truss-Rod-Adjustments.aspNeck Tilt
1.If you have neck tilt adjustment, loosen up the screws that hold the neck on.
2.Use the allen wrench to back off the neck tilt adjustment screw that is accessed from the hole in the plate the neck screws go through.
3.After you have loosened the tilt screw, re-tighten the neck screws. The tilt screw should still be completely slack after the others are tight. Don't worry, we'll come back to it later.
4.Next, string up the bass with the set of strings that you will be using. Try to only have about three turns of the string on each tuning peg.
5.Tune up your bass to the tuning you will be using. If the pickups look like they are too close to the strings, use a screwdriver to lower them.
String Relief
1.Place a capo on the first fret. (The strings are basically used as a straightedge)
2.To get as accurate a measurement as possible, hold the bass in the same position as you play it.
3.Hold down the string at the last fret (for me, the 24th) and measure the distance between the string and the fret at the half-way point on the finger board (for me, the 8th). This will tell you how much relief the neck has.
4.I set mine at about .5 mm between the string and the fret. Choose the proper thickness on the feeler gauge, and see if you can fit it in between the string and the fret without lifting the string.
1.Once the relief is set, take off the capo and pick up the ruler.
2.Hold the ruler on the last fret of the neck (closest to the bridge) and measure the distance between the strings and the fret around the 14th fret. This tells you how high your action is. On a Bass, around 3mm on the bass side, and 2mm on the treble side should be close. If the distance is more than 3mm then you have to lower the saddles on the bridge. If the distance is less than 3mm then you have to raise the saddles on the bridge.
3.Use the correct allen wrench and adjust the screws on each saddle evenly.
4.Turn each screw 1/2 turn and recheck the measurements. The most important thing to accomplish here is to make the strings be an equal height off of the neck.
5.Don't adjust the saddles so that they are bottomed out on the face of the bridge. If they won't go down far enough, then adjust them to a reasonable point and make all the strings as even as you can, matching the lowest one. (For me the lowest one is always the G.)
6.Once the strings are all even, decide if they are still too high for your style of playing.
7.If they are too high, then the neck tilt adjustment screw needs to be tightened.
8.Loosen the neck screws, and tighten the neck tilt screw a little bit. Same as the truss rod nut, 1/4 turn is a good starting point.
9.Now tighten the neck screws again and recheck the measurement.
10.Repeat this until the height of the strings is to your liking.
