AT&T ATT PC 6300 Service Manual free download

File name ATT_PC_6300_Service_Manual.pdf

*** WARNING *** This equipment has been certified to comply with the limits for a Class B computing device, pursuant to Subpart J of Part 15 of FCC Rules. Only peripherals (computer input/output devices, terminals, printers, etc.) certified to comply with the Class B limits may be attached to this computer. Operation with noncertified peripherals is likely to result in interference to radio and TV reception. Service Manual CONTENTS INTRODUCTION GENERAL 1-3 ORGANIZATION 1-4 TOOLS AND ACCESSORIES. . . . . . . . . . . . . . . . . . 1-5 SYSTEM OVERVIEW INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3 SYSTEM MODULE. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5 Motherboard 2-9 CPU and DMA Circuitry. . . . . . . . . . . . . . . . . . . . . . . . . . 2-15 Memory. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16 Input/Output Peripheral Interfaces 2-18 Input/Output Connectors 2-22 Motherboard Component Layout. . . . . . . . . . . . . . . . . . . . 2-25 Display Controllers 2-27 Bus Converter 2-31 Input/Output (I/O) Expansion Bus Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-33 Mini-Floppy Disk Unit(s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35 Slim Hard Disk Units (Optional) . . . . . . . . . . . . . . . . . . . . . . 2-37 Hard Disk Unit Controllers (Optional). . . . . . . . . . . . . . . . . . 2-39 Service Manual Memory Expansion Board (Optional) . . . . . . . . . . . . . . . . . . . 2-42 Power Supply ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-44 DISPLAY ENHANCEMENT BOARD (OPTIONAL). . . . . . . . . . . . . . .. . . . .. . . . . . . . . . . . . . . 2-49 SMALL EXPANSION BOX (OPTIONAL). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-51 DISPLAY 2-52 Monochrome Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-52 Color Display (Optional)