Grundig Beat Boy 280 User Manual

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RU
Nn
DIG
SERVICE
MANUAL
CD Btx * 32700 #
3/90 Beat Boy 280
(75986-436.05)
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Inhaltsverzeichnis Contents
Seite Page
Sicherheltsvorschriften 2,3,4und5 Safety regulations 2,3,4and5
Chip Technik 5 und6 Chip Technology 5 and6
Mechanischer Teil Mechanical Section
Allgemeines zum mechanischen Teil 7 General notes on the mechanical Section 7
Ausbauhinweise 1., ... 8. 7,8 und9 Disassembly 1., ... 8. 7,8 und9
9. Aufwickelmomente 9 9. Take-up torque 9
Leitungsverbindungen 10 Wiring diagram 10
Zeichenerklarungen 11 Legende 11
MeBpunkte und Druckpiattenabbildungen 11 und 12 Test points and illustration of pcb 11 and 12
Schaitbild 13 und 14 Circuit Diagram
Elektrischer Tell Electrical Section
Aligemeines zum elektrischen Teil 15 General information on the electrical section 15
Auszug aus den techn. Daten 15 Extract from technical data 15
Testbandcassetten 15 Test tape cassette 15
Merkmale des Beat Boy 280 15 und 16 Features of Beat Boy 280 15 and 16
Antennen 17 Aerials 17
1. Stromverbrauch 17 1. Current consumption 17
2. Bandgeschwindigkeitseinstellung 17 2. Tape speed adjustment 17
3. Kopfspalt Senkrechtstellung 18 3. Head gap azimuth adjustment 18
4. Frequenzgang 18 4. Frequency responce 18
5. Dolby Pegel 18 5. Dolby-level setting 18
Rundfunkabgleich 19 Radio alignment 19
IC-Block Diagramme 20 und 21 IC-Block diagrams 20 and 21
Ersatzteillisten und Explosionszeichnungen 22., ... 25 List of spare parts 22., ... 2

Grundig Beat Boy 280 Specifications

General

Type	Portable Cassette Player
Brand	Grundig
Model	Beat Boy 280
Built-in Speaker	Yes
Headphone Output	Yes
Power source	Batteries

Summary

Safety Regulations

General Safety and Electrical Testing

Essential safety precautions and electrical testing procedures for service.

Service Operation Recommendations

Guidelines for using original parts, fuse values, and general maintenance advice.

CHIP Component Handling

Soldering and Desoldering CHIP Components

Step-by-step guide for handling surface-mount components.

Mechanical Section

General Mechanical Notes and Disassembly Introduction

Pre-service checks, screw handling, and general component care.

Drive Mechanism and Motor Replacement

Procedures for removing and replacing the drive mechanism and motor.

Head Replacement and Tape Torque Adjustment

Steps for replacing the playback head and measuring tape take-up torque.

Component Identification and PCB Illustrations

Visual guides for component placement, PCB layout, and test points.

Integrated Circuit Block Diagrams

Electrical Section

Technical Specifications and Device Features

Comprehensive technical data and key functionalities of the Beat Boy 280.

Current Consumption and Tape Speed Calibration

Procedures for measuring power draw and adjusting tape transport speed.

Head Alignment, Frequency Response, and Dolby Levels

Adjustments for head gap azimuth, frequency response, and Dolby settings.

Radio Alignment Procedures

Steps for tuning and aligning the FM and AM radio sections.

Spare Parts List

Component Part Numbers and Descriptions

Comprehensive list of all replaceable parts with their numbers and names.

Wiring Diagram

Complete Electrical Circuit Diagram

Detailed schematic showing all electrical connections and components.

Printed Circuit Board Layouts

Component Placement and Trace Illustrations

Visual representations of component placement and PCB traces for both sides.