1541-II_Service_Manual_Addendum_314862-01_1988_Mar.pdf

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ADDENDUMPART#314861-01
SERVICE MANUAL
1541/1541-11
DISK DRIVE
MARCH, 1988
PN-314862-01
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 ofthe 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 © 1988 by Commodore Electronics Limited.
All rights reserved.
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CONTENTS (Continued)
■
Title
Page
PCB ASSEMBLY 250442, 250446
BOARD LAYOUT
30
PARTS LIST
31
IC PINOUTS AND INTERNAL DIAGRAMS
33
SCHEMATIC
33
POWER SUPPLY ASSEMBLY 1540002
PARTS LIST
34
TRANSFORMER
34
ASSEMBLY DRAWING
34
ALPS DRIVE ASSEMBLY
PARTS LIST
35
WIRING DIAGRAM AND LAYOUT
35
MOTOR CONTROL PCB SCHEMATIC
36
NEWTRONICS DRIVE ASSEMBLY
PARTS LIST
37
O
WIRING DIAGRAM AND LAYOUT
37
MOTOR CONTROL PCB SCHEMATIC
38
1541-11
1541-11 SPECIFICATIONS
39
MAJOR COMPONENTS PARTS LIST, SERVICE REFERENCE DIAGRAM
40
BOARD LAYOUT DIAGRAM
41
COMPONENT PARTS LIST
42
1541-11 SCHEMATIC 355207
43
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SPECIFICATIONS OF THE 1541-11 DISK DRIVE
STORAGE
Total formatted capacity
Maximum Sequential file size
Maximum Relative file size
Records per file
Files per diskette
Tracks per diskette
Sectors per track
Sectors per diskette
174848 bytes per diskette
168656 bytes per diskette
167132 bytes per diskette
65535
144
35
17-21
683 total
664 free for data
256
Bytes per sector
INTEGRATED CIRCUIT CHIPS USED
1 6502
Used for overall control
2 6522 VIA
Used for input and output, and as inter
nal timers
1 6116 RAM
Used as 2K of buffers
1 16K ROM
Contains a 16K Disk Operating System
(DOS)
microprocessor
Versatile Interface Adapters
Random Access Memory
Read-Only Memory
r\
INTERFACE USED
Commodore serial bus with two 6-pin DIN connectors
Device number
selectable from 8-11
Secondary addresses
0-15
PHYSICAL DIMENSIONS
Height
Width
Depth
77 mm
184 mm
256 mm
ELECTRICAL REQUIREMENTS
Three wire-grounded detachable power cable.
Voltage U.S.
Export
Frequency U.S.
Export
100-120 VAC
220-240 VAC
60 HZ
50 HZ
25 Watts
Power Used
MEDIA
Any good quality 5Va inch diskette may be used (Commodore diskettes are recommended.)
39
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