Grundig TK 14 Service Manual
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Extracted text from Grundig TK 14 Service Manual (Ocr-read)
Page 1
G-R-U-n-D-I-G
TH 14--
TAPE RECORDER
SERVICE MANUAL
LIST OF CONTENTS
Section I Introduction .......... Page I
2 Circuit Description ..... 7.
3 Dismantling for Servicing 3
4 Clutches & Brakes .......... 4
5 Testing .......... ..... 5
6 Additional Information ..... 8
1 Summarised Specification ..... 9
8 Mechanical Faults .......... I)
9 Electrical Faults ............... ll
l0 Connections to the TK.l4 .......... l2
APPENDIX
Figure I General View ............... Page l3
2 Back View ..... I3
3 Top View ............... l4
4 Sound Channel ............... l5
5 Rear View .......... l6
6 Press Button Units ............... l7
7 Recording Button Assy. .......... l8
8 Details of Clutches ............... l3
9 Wiring Diagram-Back Sockets I9
I0 Drive Belts ..... .......... I?
ll Transformer 8: Coil Details ..... 20
ll Microphone GDM I8 2|
List of Spare Parts ..... ' ..... 22
Circuit Diagram ..... in Pocket
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Page 2
SECTION I. INTRODUCTION
The Grundig Recorder type TK14 operates at a single speed of 3:} inches per second. The maximum spool size which can
be accommodated is 5% inches.
The Main Chassis Mounting Plate, which carries most of the components, is spot-welded onto a steel frame which
forms the centre portion of the whole instrument. After removal of the Plastic Bottom of the machine and the Plastic
Top Cover, all parts are readily accessible. The Amplifiers are contained on the single Printed Circuit which can be reached
easily for servicing purposes. The Mains Power Pack is mounted onto a separate sub-chassis.
The two-pole Motor drives a very generous fly-wheel which is mounted into a self aligning hearing. The upper
portion of the fly-wheel spindle is stabilised by being pressed against two protrusions on the Plastic Bearing Disc.
The right hand Clutch is driven from the fiy-wheel and use is made of the weight of the spool and tape on the right
hand Clutch to obtain the correct amount of clutching action. In the Fast Forward position, the right hand clutch is
moved to the left against an Idler Wheel which then engages with the upper portion of the Motor Pulley. For Fast
Rewind operation, the left hand clutch is moved against the upper portion of the Motor Pulley.
A Pressure Tape" is fitted to the Pressure Roller Arm of the machine which makes contact with the back of the
tape and presses this, quite uniformly, against a large portion of the Head Face. This provides an intimate contact between
the active coating on the tape and the head and minimises sudden loss due to "drop cuts.
The machine is fully press-button operated, the Press Buttons being interlocked so as to prevent incorrect operation.
Before depressing any other button, the Stop button must first be operated.
A Magic Eye Recording Level Indicator is fitted and the machine is equipped with two sockets for inputs from a
Microphone, Telephone Adaptor, Radio Set or Gramophone pick-up. A High Impedance and an Extension Loudspeaker
Output, together with a Loudspeaker Switch are also fitted. A digital type Position Indicator is fitted which is belt driven
from the left hand clutch.
The TK14 was first introduced by GRUNDIG (GT. BRITAIN) LTD., in August 1961.
Please address all Technical Correspondence on Grundz'g Equipment to:-
THE CHIEF ENGINEER, GRUNDIG (GREAT BRITAIN) LTD.
Newlands Park, Sydenham, London, S.E.26
Telephone: SYDenham 2211