The Yamaha Attitude LTD II is an electric bass guitar, a musical instrument designed for producing low-frequency sounds. This service manual provides comprehensive details for its maintenance, repair, and understanding of its technical specifications.
Function Description:
The Attitude LTD II is a high-performance electric bass, likely designed for professional musicians given its "LTD II" designation, which often implies a limited edition or high-end model. As an electric bass, its primary function is to provide the rhythmic and harmonic foundation in various musical genres. It features a solid body, a long neck with frets, and electronic pickups that convert string vibrations into an electrical signal, which can then be amplified. The instrument is equipped with multiple controls to shape its tone and volume, allowing for a wide range of sonic possibilities. The presence of both "Black" (BL) and "Lava Red" (LVR) color options suggests a focus on aesthetic appeal alongside performance.
Important Technical Specifications:
Standard Specifications:
- Scale Length: 863.6 mm, a standard long scale for electric basses, contributing to clear, resonant low notes.
- Body-Neck Construction: Bolt On, a common and versatile construction method that allows for easier neck replacement and can influence the instrument's sustain and attack.
- Length: 1184.6 mm, indicating the overall size of the instrument.
- Width: 331 mm.
- Net Weight: 4.0 kg, a moderate weight for an electric bass, suggesting a comfortable playing experience without being overly heavy.
Color:
- Body: Available in Black (BL) and Lava Red (LVR).
- Neck: Natural Satin finish (NT).
Body:
- Material: Alder + Agathis, a combination of tonewoods known for balanced tone with good sustain and resonance. Alder is a popular choice for bass bodies due offering a full-bodied sound with good highs, mids, and lows. Agathis is often used for its similar tonal properties to mahogany but at a lower cost.
- Body Depth: 44 mm.
Fingerboard:
- Material: Maple, a dense wood known for its bright tone and smooth feel.
- Fingerboard Width: 0-F 44.5 mm, 12-F 57.6 mm, indicating a widening profile from the nut to the 12th fret, which can enhance playability for different hand positions.
- No. of Frets: 21, a standard number of frets for a bass, providing a good range of notes.
Neck:
- Material: Maple, matching the fingerboard for a consistent tonal character.
- Neck Thickness: 1-F 21.6 mm, 12-F 24.2 mm, indicating a comfortable, slightly tapering neck profile.
Parts:
- Hardware: Black Nickel Plated, providing a sleek and durable finish.
- Nut: Polyacetal, a synthetic material known for its low friction and consistent tone.
- Bridge: BPX-4B (Black Nickel), a robust bridge designed for stable tuning and good string vibration transfer.
- Strings: EXL165, a specific model of bass strings, likely chosen for their tone and playability characteristics.
Controls:
- Front Volume: 15A 500KΩ x 1.
- Rear Volume: A 500KΩ x 1 (with Push/Pull SW). This indicates a push/pull switch integrated into the rear volume knob, likely for coil-splitting or other tonal modifications, offering increased versatility.
- Tone: A 500KΩ x 1 (with Push/Pull SW). Similar to the rear volume, the tone control also features a push/pull switch, further expanding the tonal options.
Pickups:
- Front: Woofer Type: DIMARZIO. This suggests a powerful, full-range pickup designed to deliver deep, resonant bass tones. DiMarzio is a renowned pickup manufacturer, known for high-quality, custom-designed pickups.
- Rear: Split Single Coil: DIMARZIO. A split single coil pickup offers hum-canceling properties while retaining some of the clarity and punch of a single coil. The combination of a woofer type in the front and a split single coil in the rear provides a broad spectrum of tones, from deep and warm to bright and articulate.
- Magnet (Front/Rear): Ferrite, a common and effective magnet material for guitar and bass pickups, known for its strong output and clear tone.
Usage Features:
The Attitude LTD II is designed for versatile performance. The combination of a woofer-type front pickup and a split single-coil rear pickup, both from DiMarzio, allows players to achieve a wide range of tones suitable for various musical styles. The dual volume controls enable blending of the two pickups, offering nuanced tonal shaping. The inclusion of push/pull switches on both the rear volume and tone controls significantly enhances the instrument's flexibility. These switches typically activate features like coil-splitting (for single-coil sounds from humbucking pickups), phase reversal, or active/passive modes, providing instant access to different sonic textures. The bolt-on neck construction offers a bright, punchy attack, while the Alder/Agathis body contributes to a balanced and resonant tone. The natural satin finish on the neck ensures smooth playability. The BPX-4B bridge and Polyacetal nut contribute to tuning stability and sustain, crucial for live performance and studio recording.
Maintenance Features:
The service manual itself is a key maintenance feature, providing detailed diagrams and part lists.
- Overall Assembly (総組立): This section, along with the "Jack Assembly," provides exploded views and part numbers for all components, making it easy to identify and order replacement parts. This is crucial for troubleshooting and repair.
- Circuit Diagram (回路図): A detailed circuit diagram is provided, which is essential for diagnosing electrical issues, repairing wiring, or modifying the electronics. It shows the connections between pickups, potentiometers, switches, and the output jack.
- Wiring (配線図): The wiring diagram offers a visual guide to the internal connections, including specific instructions like "Screw the lug terminal in cavity" and connections to "power supply switch terminal and ground terminal." This is invaluable for technicians performing repairs or re-wiring.
- Part List: The comprehensive part list includes reference numbers, part numbers, descriptions, and quantities for every component, from tuning machines and screws to pickups and electronic units. This streamlines the process of ordering exact replacement parts. For example, specific part numbers are given for the variable resistors (potentiometers) for front volume, rear volume (with push/pull SW), and front tone (with push/pull SW), as well as for the Mylar capacitors.
- Warning: The manual includes a critical warning regarding chemicals known to the State of California, advising against placing solder, electrical/electronic, or plastic components in the mouth and emphasizing safety precautions during soldering (avoiding prolonged contact, inhaling fumes, or exposing eyes to vapor). It also advises washing hands after contact with internal components before handling food. This highlights a commitment to user safety during maintenance and repair.
In summary, the Yamaha Attitude LTD II is a professionally oriented electric bass guitar, characterized by its robust construction, versatile electronics with push/pull switching for expanded tonal options, and high-quality components from manufacturers like DiMarzio. The provided service manual is a comprehensive resource, offering all necessary information for its upkeep, repair, and understanding of its intricate design.
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