Commodore Computers 1541 - Table of Contents

CONTENTS
Title Page
SPECIFICATIONS ...................................................................................................................................................... 1
BLOCK DIAGRAM ..................................................................................................................................................... 2
CARE AND MAINTENANCE ................................................................................................................................. 3
OVERVIEW .................................................................................................................................................................... 4
FLASH CODE ............................................................................................................................................................... 4
CIRCUIT THEORY
POWER SUPPLY .......................................................................................................................................... 5
RESET CIRCUIT .......................................................................................................................................... 6
CLOCK CIRCUITS ....................................................................................................................................... 7
MICROPROCESSOR CONTROL OF RAM & ROM
.................................................................... 8
SERIAL INTERFACE .................................................................................................................................. 9
MICROPROCESSOR R/W AND MOTOR CONTROL LOGIC .................................................. 10
READ/WRITE CONTROL LOGIC .......................................................................................................... 11
READ AMPLIFIER ....................................................................................................................................... 12
WRITE AMPLIFIER ..................................................................................................................................... 13
POWER UP/DOWN WRITE PROTECTION
..................................................................................... 14
STEPPER MOTOR CONTROL CIRCUITS ......................................................................................... 15
SPINDLE MOTOR CONTROL CIRCUITS ......................................................................................... 16
TROUBLESHOOTING GUIDE ............................................................................................................................... 17
RESISTANCE CHECKS ........................................................................................................................................... 19
CASEWORK/ACCESSORY PARTS LIST ........................................................................................................ 20
MODEL IDENTIFICATION ....................................................................................................................................... 21
DEVICE NUMBER CHANGE .................................................................................................................................. 21
PCB ASSEMBLY 1540001
BOARD LAYOUT ........................................................................................................................................ 22
PARTS LIST ................................................................................................................................................... 23
PIN CONFIGURATIONS ........................................................................................................................... 25
SCHEMATIC ................................................................................................................................................. 25
PCB ASSEMBLY 1540048
BOARD LAYOUT ........................................................................................................................................ 26
PARTS LIST ................................................................................................................................................... 27
UPGRADE NOTES ....................................................................................................................................... 29
SCHEMATIC ................................................................................................................................................. 29