C2N-1530-1531 Service Manual Preliminary 314002-002 1984 Oct, C-64 PDF book
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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.
Copyright
©
1984 by Commodore Electronics Limited.
All rights reserved.
CONTENTS
Title
Page
SPECIFICATIONS
1
DATASETTE OVERVIEW. ... ..... ............................ ..... ...... ............. ...... ........ .............
1
COMMODORE PARTS LIST..................... ............ ......................... ......... .................
2
TROUBLESHOOTING FLOW CHART
TAPE DOES NOT RUN........................... .............................................. ........
3
DOES NOT LOAD .............................. ................. ........... .....................
4
DOES NOT SAVE .......... .............. ............... ......... ................................
5
DOES NOT AUTO STOP ......................................................................
6
DOES NOT LIGHT ............. ...... ....................... .......... ...........................
6
PCB ASSEMBLY # 320009
BOARD LAYOUT .......... .................... ........ ................................. ..................
7
PARTS LIST AND SCHEMATIC ...... ............ ................................. ..................
8
PCB ASSEMBLY # 3201 09
BOARD LAYOUT .........................................................................................
9
PARTS LIST AND SCHEMATIC .....................................................................
10
PCB ASSEMBLY # 320275
BOARD LAyOUT..... ..... ........... ...................... .............. ................................
11
PARTS LIST AND SCHEMATIC ........... ....... ...... ............. ................... .............
12
PCB ASSEMBLY # CMR-001-0
BOARD LAYOUT ...................................... .............................. ......... ............
13
WIRING DIAGRAM ........... ............ ............ ...................................... .............
14
PARTS LIST AND SCHEMATIC ...... ................................................. ..............
15
PCB ASSEMBLY # NP-090
WIRING DIAGRAM .. ..... .................... ........ ......... ..... ..................... .... ............
16
PARTS LIST AND SCHEMATiC...... ............ .............................. .....................
17
PCB ASSEMBLY #017-5001-01
BOARD LAYOUT.. ... ..... .................... ........ ..... ...... ............. .... ..... ..... ..... .... ....
18
WIRING DIAGRAM .. ..... .................... ...................... .............. ............ ...........
19
PARTS LIST AND SCHEMATIC .... ......... ..... ........ .......... .......... ..... ........... .......
20
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.
1
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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.
Copyright
©
1984 by Commodore Electronics Limited.
All rights reserved.
CONTENTS
Title
Page
SPECIFICATIONS
1
DATASETTE OVERVIEW. ... ..... ............................ ..... ...... ............. ...... ........ .............
1
COMMODORE PARTS LIST..................... ............ ......................... ......... .................
2
TROUBLESHOOTING FLOW CHART
TAPE DOES NOT RUN........................... .............................................. ........
3
DOES NOT LOAD .............................. ................. ........... .....................
4
DOES NOT SAVE .......... .............. ............... ......... ................................
5
DOES NOT AUTO STOP ......................................................................
6
DOES NOT LIGHT ............. ...... ....................... .......... ...........................
6
PCB ASSEMBLY # 320009
BOARD LAYOUT .......... .................... ........ ................................. ..................
7
PARTS LIST AND SCHEMATIC ...... ............ ................................. ..................
8
PCB ASSEMBLY # 3201 09
BOARD LAYOUT .........................................................................................
9
PARTS LIST AND SCHEMATIC .....................................................................
10
PCB ASSEMBLY # 320275
BOARD LAyOUT..... ..... ........... ...................... .............. ................................
11
PARTS LIST AND SCHEMATIC ........... ....... ...... ............. ................... .............
12
PCB ASSEMBLY # CMR-001-0
BOARD LAYOUT ...................................... .............................. ......... ............
13
WIRING DIAGRAM ........... ............ ............ ...................................... .............
14
PARTS LIST AND SCHEMATIC ...... ................................................. ..............
15
PCB ASSEMBLY # NP-090
WIRING DIAGRAM .. ..... .................... ........ ......... ..... ..................... .... ............
16
PARTS LIST AND SCHEMATiC...... ............ .............................. .....................
17
PCB ASSEMBLY #017-5001-01
BOARD LAYOUT.. ... ..... .................... ........ ..... ...... ............. .... ..... ..... ..... .... ....
18
WIRING DIAGRAM .. ..... .................... ...................... .............. ............ ...........
19
PARTS LIST AND SCHEMATIC .... ......... ..... ........ .......... .......... ..... ........... .......
20
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.
1
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