Nakamichi MB 4S Service Manual

Page 2

CONTENTS

.-

General .......................

2. Mechanical Adjustments ...............................................
2.1. Gear Positioning in Side Chassis R Section .

2.2. Tray Ass'y Positioning ..
2.3. Lubrication ..........
Measurement Instruments an igs
Parts Location tor Electrical Adjustment

Electrical Adjustments
Mechanism Ass'y and Parts List

PP'P.

6.1 _ Synthesis .....................

6.2. Front Panel Ass'y (A01)

63. Mechanism Ass'y (A02)

54. Side Chassis R Section (Bot)

6.5. Main Chassis Section (302)

6.6. Drive Unit Section (B03) .....

7. Mounting Diagrams and Parts List.

7.1. Main P.C.B. Ass'y ...............

7.2. Transformer P.C.B. Assy

7.3. Power Switch P.C.B. Ass'y .

7.4. Key P.C.B. Ass'yw

7.5. Display PCB. Ass'y.

8. IC Block Diagrams .

9. Block Diagram

10. Wiring Diagrams
Specifications

Schematic Diagram (See attached sheet.)

1. GENERAL

1 .1. Product Code
V331

1.2. Destinations
USA. CAN, EP, UK. AUS. OTR. JPN

Abbreviations
USA - U.S.A.
CAN - Canada
EP - Europe

UK - United Kingdom
AUS - Australia

OTFi - Other

JPN -- Japan

1.3. Cautions/Warnings

(1) Product Safety Notice A

Parts marked with the symbol in the schematic
diagram have critical characteristics.

Use ONLY replacement parts recommended by the manu-
facturer. it is recommended that the unit be operated from a
suitable DC supply or batteries during initial check~out pro-
cedures.

(2) Leakage Current Check/Resistance Check

Before returning the unit to the customer, make sure you
make either (1) a leakage current check or (2) a line to
chassis resistance check, it the leakage current exceeds
0.5 milliamp, or ii the resistance from chassis to either side
of the power cord is less than 240 k ohms, the unit is deter).
tive.

WARNING - DO NOT return the unit to the customer until
the problem is located and corrected,

(3) Protection of Eyes from Laser Beam
To protect eyes from invisible laser beam during servicing.
DO NOT LOOK AT THE LASER BEAM.

. Laser Diode Properties

Material: GaAlAs
Laser output: 0.5mW Max.
Wavelength: 790 i; 25 nm

Emission duration: Continuous