User manual YAMAHA 25NERO SERVICE MANUAL

[. . . ] 6 CORRECT USE AND HANDLING OF BATTERIES . . . . . . . . . . . . . . . . 7 CARE AND MAINTENANCE * When connecting or disconnecting cables, turn off the amplifier and other equipment or reduce the volume. After playing, wipe the entire guitar down, including strings, with a good polishing cloth. [. . . ] This will remove corrosive skin oils and acids, and protect the plating, finish, and strings. Avoid exposing the guitar to direct sunlight and extremes of heat and humidity. Congratulations on your choice of the Yamaha electric bass. With reasonable care, your Yamaha electric bass will age gracefully and provide many years of superlative musical service. * * 2 TUNING MACHINE TENSION ADJUSTMENT The tuning machines have spring-loaded mechanisms which automatically take up wear, preventing backlash. However, it is possible to adjust the amount of pressure required to turn the machines. Each machine has a tension adjustment screw, as illustrated. Clockwise rotation tightens the machine. The tuning machines should be adjusted to the extent that they are firm, but can turn smoothly. If the fretted note is pitched higher than the harmonic, turn the corresponding saddle adjustment screw clockwise, increasing the active string length. Conversely, if the fretted note is pitched lower than the harmonic, turn the corresponding saddle adjustment screw counterclockwise, reducing the active string length. When lower than harmonic When higher than harmonic 5 PICKUP HEIGHT ADJUSTMENT Proper pickup adjustment ensures maximum output level and uniform response on all strings. To make adjustments, follow the directions below: Using your left hand, depress each string at the last fret, while setting one end of the 15cm rule on top of the pickup section directly under each string. The flat side of the rule should be against the string. The space between the bottom of each string and the top of the corresponding pickup section should be 2mm. Pickup adjustment screws Pickup adjustment screws TRUSS ROD ADJUSTMENT The curvature of the neck should be slightly concave. Clockwise rotation of the nut tightens the rod and corrects for too much concave bow. Counterclockwise rotation of the nut loosens the rod and corrects for too much convex bend. [. . . ] Counterclockwise rotation of the nut loosens the rod and corrects for too much convex bend. Allow five to ten minutes for setting, and check the curvature after each 1/2 turn of the truss rod nut. If too much convex bend If too much concave bow concave convex NOTE: Unless you have experience with truss rods, we suggest that you entrust this adjustment to your dealer. 6 CORRECT USE AND HANDLING OF BATTERIES Battery (6LR61 : 9V, S-006P) Battery (6LR61 : 9V, S-006P) When these run out, don't just throw them away, but dispose of them as minor chemical waste. * When changing batteries, pay close attention to the +/- polarity markings as shown in the illustration above. 7 SERVICE If your guitar should need any parts or service, or if you need any information, including the address of your nearest YAMAHA dealer, contact: YAMAHA CORPORATION OF AMERICA Guitar Service Department 6600 Orangethorpe Avenue Buena Park, Calif. TEL: 714 522 9433 YAMAHA CANADA MUSIC LTD. 135 Milner Avenue Scarborough Ontario MIS 3R1 Canada TEL: 416 298 1311 YAMAHA-HAZEN ELECTRONICA MUSICAL S. A. Jorge Juan 30, 28001 Madrid Spain TEL: 593 2554 YAMAHA MUSICA ITALIA S. P. A. [. . . ]