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Back to : 98041-90030_98041A_Disc_I | Home Hewlett-Packard 98041A Disc Interface Installation and Service Manual HEWLETT II PACKARD - HEWLET~". PACKARD Warranty Statement Hewlett-Packard products are warranted against defects in materials and workmanship. For Hewlett-Packard Desktop Computer Division products sold in the U.S.A. and Canada, tllis warranty applies for ninety (90) days from date of delivery. * Hewlett-Packard will, at its option, repair or replace equipment which proves to be defective during the warranty period. This warranty includes labor, parts. and surface travel costs, if any. Equipment returned to Hewlett-Packard for repair must be shipped freight prepaid. Repairs necessitated by misuse of the equipment, or by hardware, software, or interfacing not provided by Hewlett-Packard are not covered by this warranty. NO OTHER WARRANTY IS EXPFlESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. HEWLETI-PACKARD SHALL NOT BE LIABLE FOR CO \JSEQUENTIAL DAMAGES. * For other countries, contact your local Sales and Service Office to determine warranty terms. 98041A Disc Interface Installation and Service Manual Hewlett-Packard Desktop Computer Division 3404 East Harmony Road, Fort Collins, Colorado 80525 (For World-wide Sales and Service Offices see back of manual.) Copyright by Hewlett-Packard Company 1978 iii Chapter 1: General Inforolation Introduction ..................................................................... 1 Equipment Supplied .............................................................. 1 Specifications .................................................................... 2 Technical Specifications ....................................................... 2 Chapter 2: Installation Power Requirements ............................................................. 3 Grounding Requirements ... . .................................................... 3 Fuses ............................................................................ 4 Power Cords ...................................................................... 4 Installing the Disc Interface ........................................................ 5 Interface Select Code ......................................................... 6 HP-IB Capabilities ............................................................ 7 Connecting Mass Storage Controllers ........................................... 7 Interconnecting Cables ........................................................ 7 Cable Length Restrictions ..................................................... 8 ROM Requirements ........................................................... 9 Mass Storage Unit Installation .................................................. 9 Rack Mounting ............... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Chapter 3: Theory of Operation and Service Disc Interface General Description ................................................ 11 System Operation Overview .................................................. 12 Interface Logic Levels ........................................................ 12 Interface Card Operation ........................................................ 12 The Al I/O Control Board ................................................... 12 The A2 Data Logic Board .................................................... 13 Central Data Unit Operation ..................................................... 13 The A3 Support Board ....................................................... 14 The A4 HP-IB Board ......................................................... 14 The I/O Regis tE~rs ....................................................... 14 The PHI Chip. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 The FIFO Buffer ........................................... . . . . . . . . . . . . .. 1 7 The PHI Access Control .................................................. 17 The Byte Packing Control ................................................ 18 The FIFO Fullness Counter and DMA Request Logic ........................ 18 iv The Interrupt Request Logic .............................................. 18 The HP-IB Transceivers .......... . 18 The AS HP-IB Connector Board .. . 18 The A6 Power Supply Board ................................................. 19 Interface Block Diagram ...................................................... 21 Sequential Operation Description ................................................. 23 Non-DMA Output Operation .................................................. 23 Non-DMA Input Operation ................................................... 23 Computer DMA Output Operation ............................................ 24 Computer DMA Input Operation .............................................. 26 Additional Theory of Operation .................................................. 29 The PHI Access and Byte Packing Control State Machines ....................... 29 Byte Packing Control State Diagram ........................................... 31 PHI Access Control State Diagram. . .......................................... 33 Servicing the Disc Interface ................................................... 35 Disc Interface Disassembly Procedur es ........................................ 35 Al and A2 Assembly Access .................................................. 36 A3 thru A 7 Assembly Access ................................................. 37 Removing the A4 HP-IB Board ............................................ 38 Removing the A6 Power Supply Board ..................................... 38 Removing the A3 Support Boare .......................................... 40 Removir:tg the AS HP-IB Connector Board ................................. 40 Removing the A 7 I/O Cable As~embly .................................... 42 Replacing the PHI Chip (A4U 1) ....... . ......................................... 44 Adjusting the PHI Internal Timing. . . . .. . ......................................... 45 Procedure ....................... . ......................................... 45 Glossary of Line and Signal Name Abbreviations ............................... 48 Al I/O Control Board Al Replaceable Parts. . . . . . . . . . . .. . ......................................... 51 A 1 Component Locator. . . . . . . . . .. . ......................................... 51 A 1 Schematic Diagram. . . . . . . . . . .. .......................................... 51 A2 Data Logic Board A2 Replaceable Parts . . . . . . . . . . . .. . ......................................... 53 A2 Component Locator .......... . .......................................... 53 A2 Schematic Diagram ........... . .......................................... 53 A3 Support Board A3 Replaceable Parts ............ . . ..................................... 55 A3 Component Locator .......... . . ...................................... 55 A3 Schematic Diagram ........... . . ...................................... 55 v A4 HP-IB Board A4 Replaceable Parts ....................................................... 57 A4 Component Locator ....................................................... 58 A4 Schematics Diagram Part 1 ................................................. 59 A4 Replaceable Parts ........................................................ 61 A4 Component Locator ...................................................... 62 A4 Schematic Diagram Part 2 ................................................. 63 A4 Replaceable Parts ........................................................ 65 A4 Component Locator ...................................................... 66 A4 Schematic Diagram Part 3 ................................................. 67 AS HP-IB Connector Board AS Replaceable Parts ........................................................ 69 A6 Power Supply Board A6 Replaceable Parts ......................................................... 71 A6 Component Locator ....................................................... 71 A6 Schematic Diagram ........................................................ 71 A7 I/O Cable Assembly A7 Replaceable Parts ........................................................ 73 A 7 Connector Wiring Diagrams ............................................... 73 Chassis and Case Components ............................................... 75 Appendix ....................................................................... 77 13037 Disc Controller Service Notes .......................................... 78 Sales and Service Offices ..................................................... 82 Figures Line Voltage Switches ............................................................ 3 Power Cords ...................................................................... 5 HP 98041A Disc InterfacE~ .......................................................... 6 Interface Select Code Swilch ........................................................ 6 Standard HP-IB Cables ........................................................... 7 Example System ConfigUirations ................................................... 8 Basic Control Machine Structure .................................................. 29 Structure of the Controller Circuitry ............................................... 30 Interface Card Disassembly ...................................................... 36 A3 thru A7 Assembly Access ..................................................... 37 Removing the A4 HP-IB Board