C2N-1530-1531_Service_Manual_Preliminary_314002-002_1984_Oct.pdf

SERVICE MANUAL

DATASETTE

MODEL C2N/1530/1531

Preliminary

OCT. 1984

PN-314002-02

The Commodore Datasette has undergone many changes both in physical appearance and electronic

circuitry. This preliminary package is an attempt to cover as many different versions as possible. If

you need information for a version of Commodore Datasette not covered, please write to Service

Documentation, Box C-2654, West Chester, PA 19380. Be sure to include an accurate description

of the datasette in need of repair.

Commodore Business Machines, Inc.

1200 Wilson Drive, West Chester, Pennsylvania 19380 U.S.A.

Commodore makes no expressed or implied war-

ranties with regard to the information contained

herein. The information is made available solely on

an as is basis, and the entire risk as to quality and

accuracy is with the user. Commodore shall not be

liable for any consequential or incidental damages

in connection with the use of the information con-

tained herein. The listing of any available replace-

ment part herein does not constitute in any case

a recommendation, warranty or guaranty as to

quality or suitability of such replacement part.

Reproduction or use without expressed permission,

of editorial or pictorial content, in any matter is

prohibited.

This manual contains copyrighted and proprietary information. No part

of this publication may be reproduced, stored in a retrieval system, or

transmitted in any form or by any means, electronic, mechanical,

photocopying, recording or otherwise, without the prior written permis-

sion of Commodore Electronics Limited.

CONTENTS

Title

Page

SPECIFICATIONS

DATASETTE OVERVIEW. ... ..... ............................ ..... ...... ............. ...... ........ .............

COMMODORE PARTS LIST..................... ............ ......................... ......... .................

TROUBLESHOOTING FLOW CHART

TAPE DOES NOT RUN........................... .............................................. ........

DOES NOT LOAD .............................. ................. ........... .....................

DOES NOT SAVE .......... .............. ............... ......... ................................

DOES NOT AUTO STOP ......................................................................

DOES NOT LIGHT ............. ...... ....................... .......... ...........................

PCB ASSEMBLY # 320009

BOARD LAYOUT .......... .................... ........ ................................. ..................

PARTS LIST AND SCHEMATIC ...... ............ ................................. ..................

PCB ASSEMBLY # 3201 09

BOARD LAYOUT .........................................................................................

PARTS LIST AND SCHEMATIC .....................................................................

PCB ASSEMBLY # 320275

BOARD LAyOUT..... ..... ........... ...................... .............. ................................

PARTS LIST AND SCHEMATIC ........... ....... ...... ............. ................... .............

PCB ASSEMBLY # CMR-001-0

BOARD LAYOUT ...................................... .............................. ......... ............

WIRING DIAGRAM ........... ............ ............ ...................................... .............

PARTS LIST AND SCHEMATIC ...... ................................................. ..............

PCB ASSEMBLY # NP-090

WIRING DIAGRAM .. ..... .................... ........ ......... ..... ..................... .... ............

PARTS LIST AND SCHEMATiC...... ............ .............................. .....................

PCB ASSEMBLY #017-5001-01

BOARD LAYOUT.. ... ..... .................... ........ ..... ...... ............. .... ..... ..... ..... .... ....

WIRING DIAGRAM .. ..... .................... ...................... .............. ............ ...........

PARTS LIST AND SCHEMATIC .... ......... ..... ........ .......... .......... ..... ........... .......

iii/iv

SPECIFICATIONS

SPEED

300 baud throughput, programs saved twice for internal error checking, check-summing for data files.

CONTROLS

Keys for play, record, fast-forward, rewind, and stop. Sensor for software detection of key press.

Counter for tape location.

FORMAT

Commodore propriety format using pUlse-width modulation and square waves. Allows naming of pro-

grams and files, verification of programs, end of tape marker sensing.

TAPES

Uses standard audio cassette tapes. Digital tapes not required.

COMPATABILITY

C2N!1530 -

VIC20, C64, PET Series Computer

1531 -

PLUS 4, C 16

DATASETTE OVERVIEW

The electronics of the datasette contains read/write circuits that replace the audio-type circuits in

a standard audio tape recorder.

Status/Motor Control - When the play switch is depressed, a ground potential is applied to the cassette

enable line of the microprocessor. It, in turn, signals the cassette drive motor through a transistor

switch located on the main computer board. The cassette is then ready for read/write operation.

Write/Record Amplifier - The computer outputs a square wave signal to the datasette. These TTL

logic-level shifts are converted by the pre-amplifier and power amplifier to a proportional current out-

put. This current output is then applied to the read/write coil of the head. Through induction, magnetic

fields are produced on the tape representing the data.

Read/Playback Amplifier - The read amplifier circuit takes the reproduced transition signals from the

tape and converts them back to TTL logic-level shifts. This is accomplished by an amplifier limiter

which removes the amplitude variations and a switching circuit that toggles the output data between

o and 5 volts. The signal is then ready for output to the computer.

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