Nakamichi PA-304 - Service Manual

service Manual
Nakamichi
Nakamichi
PA-304
Mobile Power Amplifier

Summary

1. GENERAL

1.1. Notes on Order of Spare Parts

Details on ordering specific parts not included with PCB assemblies.

3. ADJUSTMENTS

3.1. Parts Location for Adjustment

Identifies VR potentiometers and test points on PCBs for adjustment procedures.

3.2. Adjustment Procedures

Step-by-step instructions for setting output voltage and idling current.

4. MECHANISM ASSY AND PARTS LIST

4.1. Synthesis

Exploded view and parts list for the main assembly and sub-assemblies.

4.2. TR Block Assy B (A01)

Parts list and diagram for TR Block Assembly B.

4.3. TR Block Assy C (A02)

Parts list and diagram for TR Block Assembly C.

4.4. TR Block Assy A (A03)

Parts list and diagram for TR Block Assembly A.

5. MOUNTING DIAGRAMS

5.1. Power Supply P.C.B. Assy

Diagram showing the mounting of the Power Supply PCB.

5.2. Main P.C.B. Assy

Diagram showing the mounting of the Main PCB.

5.3. Fuse P.C.B. Assy

Diagram showing the mounting of the Fuse PCB.

5.4. BTL Switch P.C.B. Assy

Diagram showing the mounting of the BTL Switch PCB.

6. WIRING DIAGRAM

7. SCHEMATIC DIAGRAM

8. BLOCK DIAGRAM

9. SPECIFICATIONS

Nakamichi PA-304 Specifications

General

Total Harmonic Distortion	0.05%
Signal-to-Noise Ratio	100 dB
Input Impedance	20 kOhms
Channels	4
RMS Power at 4 Ohms	150W x 4
Input Sensitivity	0.2V - 5V
Damping Factor	>200
Power Output	150W x 4
Frequency Response	10Hz - 40kHz
Crossover Frequency	50Hz - 250Hz
Bass Boost	0 to +18 dB