Nakamichi 420 Service Manual

Page 2

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CONTENTS
1. General
2 Principle of Operation

2. 1. Power Supply

2. 2. Power Block Pre-stage

2. 3. Power Block Output Stage
3. Removal Procedures

3.1 Top Cover Assy
Power Block Ass' V

was»
:59")

Transformer, Capacitors etc.
3. 5. 2P Pin Jack and Push Terminal
4. Readjustment of Power Block
5. Mechanism Ass'y and Parts List
5. 1. Synthesis ~-
5.2. Mechanism Ass' y (A01)
5. 3. Front Panel Ass y lA02)
5. 4. Rear Panel Ass'y (A03)
5. 5. Rear Panel Sub-ass'y (301)
6. Mounting Diagrams and Parts List
6. 1. Power Block Ass y ...
6.1.1. Power Block P. C. B. Ass y
6. 2. Output P.C.B. Ass' y
7. Wiring Diagram
8. Performance Data
9. Block Diagam
10. Schematic Diagram ..
11. Bridging Adaptor BA-100 (Option)
12. Specifications

Front Panel Ass y, Lamp and Thermostat

3

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sézzrfi'g'lc Part No. Description Sailings: Part No. Description
0314" PM" BM" As R040 oeosezzA Carbon Resistor 21K ERD-14 TJ
BA03811A Power Block P-C-B- AsSy coo1 oeosszoA Electrolytic Capacitor
0J03572A Heat Sink 420 22;; 16V MiMS)
0J03560A Spring Pin (2 pcs.) €002 0805893A Ceramic Capacitor 680? 50V K
0E00231A Screw M2,6x8 Philips Pan Head FT 0003 0505879A Ceramic Capacitor 220p 50v K
(3 pch (2004 0B05905A Ceramic Capacitor 5P 50V K
0J03494A Transistor Bushing (10 DES.) C005 0B05806A Caramic Capacitor 22P 50V K
0J03573A Trmsistor Plate (2 Des.) C006, 016 0305B81A Ceramic Capacitor 3300P 50V M
0J03574A Transistor R Holder (1 pce.) 017
0J03575A Transistor L Holder (1 DEE.) 0007, 014 0B05882A Ceramic Capacitor 0,022 50V M
0E00722A Screw M3x12 Philips Pan Head 015
(10 pcs.) C008 0305842A Electrolytic Capacitor
0E00732A Washer 3mm (8 pcs.) 470A 6.3V
0E00723A Washer 3mm Spring (10 Des.) C009, 012 0305904A Electrolytic Capacitor
4.71.4 50V MiMS)
BA03811A Power Block P.C.B. Ass'v C010, 011 0301356A Ceramic Capacitor 0.11.4 50V M
C013 0305892A Ceramic Capacitor 100P 50V K
0B07693A Power Block P.C.B.
0001, 004 0506078A Transistor 2801400 BA03812A Output P,C.B. Au'y
005
0002, 003 0506074A Transistor ZSA750 0507692A Output P,C.B.
005 D301 0306109A Silicon Diode GPOSB
0007, 013 0806102A Transistor 23A915 (Ll L101, 201 BA03784A Output Coil Ass'y 2.3uH
0008, 014 0306101A Transistor ZSC1940 (L) R101, 201 0305906A Metal Film Resistor 1O ERX-ZAN
0009, 011 0306103A Transistor 285549 R102, 202 0B05907A Metal Film Resistor 15 ERX-3AN
018 R301 0301704A Carbon Resistor 68 ERD-14 TJ
0010. 012 0306104A Transistor 230415 C101, 201 0501772A lear Capacitor 0.1211 50V K
017 F101, 201 0508278A Fuse 3.15A
0015 0306100A Transistor 280945 (A)
0016 0306013A Transistor 28A733
0019 0306106A Transistor 28D586 (A)
0020 0806105A Transistor 285616 (A)
D001, 002 0301909A Silicon Diode 181555
003, 004
005, 006
007, 008
009, 010
D011 OBOG107A Silicon Diode VD1212
R001, 009 0301888A Carbon Resistor 10K E RD»14 TJ
R002, 003 0505614A Carbon Resistor 1,8K ERD~14 TJ
004
R005 0501846A Carbon Resistor 4.7K ERD-14 TJ
R006, 010 0505509A Carbon Resistor 33K ERD-14 TJ
021, 024
R007 0805615A Carbon Resistor 22K' ERDAM TJ
R008, 012 0801680A Carbon Resistor 820 ERU-14 TJ
R011, 018 OBOSSSOA Carbon Resistor 18K ERD-14 TJ
019
R013,014 0301706A Carbon Resistor 47 ERD-14 TJ
023, 027
R015 0E05903A Metal Film Resistor
510 ERG-25 CKG
R016 0305878A Metal Film Resistor
' 10K ERG-25 CKG
R017, 022 0305875A Carbon Resistor 27 ER D-14 TJ
026
R020, 025 0005645A Carbon Resistor 270 ERD-14 TJ
R028, 029 0305771A Carbon Resistor 12K ERD»14 TJ
R030, 031 0801704A Carbon Resistor 68 ERD-14 TJ
R032, 037 OEOSSEOA Carbon Resistor 2,2 ERD-14 TJ
R033, 036 0305623A Carbon Resistor 12K ERD-14 TJ 1
R034, 035 0805575A Carbon Resistor 560 PERU-14 TJ
R038, 039 0305902A Metal Film Resistor
0.47 EFiX-3AN
1 2