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- General Description
  - Introduction
- Major Features
  - Microprocessor Control
  - Write Protect
  - Daisy Chain Capability
  - Internal Trim Erase
  - Industry Standard Interface Compatibility
  - Activity Indicator
  - Direct Drive, Brushless D. C. Motor
  - Compact Size
  - Diskette Lever Lock Solenoid (Optional)
- Purpose of the Drive
- Scope of the Document
- 1.4 Functional Description
  - Self-Tests
- Physical Description
  - Product Specifications
    
    Introduction
- Electrical and Operational Specifications
- Environmental Specifications
  - Operation
    
    Introduction
- Mechanical Specifications
- Reliability Specifications
- Mounting the Drive
  - Dust Cover
  - Cooling
- Preinstallation Checkout
- Unpacking the Drive
- Interface Connections
  - Input Control Lines
  - Drive Interface Lines and Pin Assignments
    
    Output Control Lines
    
    Typical Interface Characteristics
- Power
  - P O W E R C O N N E C to R P in a S S Ig N M E N Ts
- Drive Address and Option Strapping
  - D R IV E S E Le C T ( D S L - D S 4 )
  - Option Patching
    
    Stepper Motor Power (Ps, Ps*, Ds, Hl)
    
    Ready and True Ready (R and Tr)
    
    Lever Lock Options (D, Dl, Ll, Nl)
    
    Disk Change (DC)
    
    Two-Sided Diskette Installed (2S)
    
    Write Protect (Wp and Np)
    
    Write Current Switch (XC and IC)
- Diskettes
  - Loading the Diskette
  - Write Protect Tab
  - Diagnostic Mode of Operation
    
    Diskette Handling and Storage
  - Theory of Operation
    
    Introduction
- Data Recording
- Components of the Drive
- Generate and Interpret Control and Status Signals
  - Index Sensor(S)
  - Write Protect Sensor
  - Track 0 Sensor
  - L E V E R C Lose S W Itc H
  - Drive Select
  - Lever Lock Solenoid
- Read/Write Head Positioner
  - Step and Direction
  - Stepper Motor Control
  - Stepper Motor
- Read/Write Data
  - Read/Write Head Assembly
  - Side Select Circuits
  - Write/Erase Circuits
  - Read Data Circuits
- Spindle Control
  - Spindle Motor Enable Circuit
  - Spindle Motor Control Circuit
  - Maintenance Checks and Adjustments
    
    Introduction
- Equipment Required
- Is U a L I N S P E C T Io N
- Power/Drive Select Check
- Drive Motor Speed Check
- Radial Track Alignment Check and Adjustment
  - Radial Track Alignment Check
  - Radial Track Alignment Adjustment
- Write Protect Sensor Check
- In D E X C Hecks a N D a D Ju S T M E N T S
  - Index-To-Data Burst Check
  - Index Sensor Adjustment
- Azimuth Check
  - Track 0 Sensor Check and Adjustment
    
    Track 0 Sensor Check
    
    Track 0 Sensor Adjustment
- 5.10 Head Output Check
- 5.11 Cone Centering Check
  - Troubleshooting Guide and Replacement Procedures
  - Introduction
- Soft Errors
- Symptom Diagnostic Techniques
- Troubleshooting Guide
- Replacement Procedures
  - Logic Circuit Board
  - Cone Assembly
  - Diskette Lever
  - Front Panel
  - Bridge Assembly
  - D R IV E M O to R
  - Load Arm Assembly
  - Track 0 Sensor Assembly
  - Write Protect Sensor Assembly
  - Motor Switch Assembly
  - Index Sensor Assembly
  - Diskette Ejector Assembly
  - Stepper Band
  - Stepper Motor Assembly
  - Head Carriage Assembly
  - Table Page
  - Number Title Number
  - E Le C Tr IC a L a N D O P E Ra Tio N a L S P E C Ific a Tio N S
  - General Description
  - Introduction
  - Scope of the Document
  - Purpose of the Drive
  - Major Features
    
    Microprocessor Control
    
    Daisy Chain Capability
    
    Industry Standard Interface Compatibility
    
    Activity Indicator
    
    Air Filtration
  - Functional Description
  - Physical Description
  - Product Specifications
  - Introduction
  - Mechanical Specifications
  - Electrical and Operational Specifications
  - Reliability Specifications
  - Environmental Specifications
  - Operation
  - Introduction
  - Unpacking the Drive
  - Mounting the Drive
    
    Dust Cover
    
    Free Air Flow
    
    Confined Environment
  - Interface Connectors
    
    J2/P2 Connector
    
    J3/P3 Connector
    
    Frame Ground Connector
  - Interface Line Descriptions
    
    Input Control Signals
    
    Output Control Signals
    
    Data Transfer Signals
  - Drive Address and Option Selection
  - Shipping Pack and Handling
  - Troubleshooting Guide
  - Test Equipment
  - Test Points
  - R E P la C E M E N T P Ro C E D U Re S
  - Control and Data Circuit Board Assembly
  - F Ro N T P Anel L .E .D . Assem Bly
  - Linear Brake Assembly
  - Tools Required
  - Index Assembly
  - Frame Assembly
  - Track 0 Sensor Assembly

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TANDY®

Service Manual

TANDY

6000/6000 HD

Catalog Number 26-6021/2

CUSTOM MANUFACTURED FOR RADIO SHACK, A DIVISION OF TANDY CORPORATION

Table of Contents

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Table of Contents

Troubleshooting

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Summary of Contents for Tandy 6000

Page 1 TANDY® Service Manual TANDY 6000/6000 HD Catalog Number 26-6021/2 CUSTOM MANUFACTURED FOR RADIO SHACK, A DIVISION OF TANDY CORPORATION...
Page 3 TANDY COMPUTER PRODUCTS SERVICE MANUAL TANDY® 6000/6000-HD Catalog Number 26-6021/2...
Page 4 Copyright 1985 Tandy Corporation All Rights Reserved Reproduction or use, without express written permission from Tandy Corporation, of any portion of this manual is prohibited. While reasonable efforts have been taken in the preparation of this manual to assure its accuracy, Tandy...
Page 5: Table Of Contents
TANDY COMPUTER PRODUCTS Contents Page N o . Introduction ........... Technical Specifications ......7 Disassembly/Assembly Procedures ...... Adjustments ........... Cabling Diagrams/Pin Designations ....Troubleshooting Procedures ......47 Theory of Operation Mother Board ........ MC68000 CPU B o a r d ......61 Memory Board .......
Page 6 TANDY COMPUTER PRODUCTS List of Figures Number Description Page No. Major Assemblies, TANDY 6000/6000-HD ..Cover/Bezel Assembly Mounting Screws ..Electronics Module Assembly ....Adjustments ........Cable Interconnection Layout ....Cable Wiring/Connector Location Floppy Disk Drive Version 1 ....Cable Wiring/Connector Location Hard Disk Drive Version 1 ....
Page 7 TANDY COMPUTER PRODUCTS Exploded View, Base Assembly ....Exploded View, Card Cage, Chassis, and Power Supply......Exploded View, Floppy Disk Drive ... Exploded View, Hard Disk Drive Assembly ..251 Exploded View, Bezel Assembly ....Exploded View, Reset/Power On Indicator Module ......
Page 8 TANDY COMPUTER PRODUCTS...
Page 9: 1/ Introduction
It does not, however, provide a component by component analysis of the system. The basic TANDY 6000 is supplied with two floppy Disk Drives and five PCB assemblies; the TANDY 6000-HD is supplied with one floppy disk and one internal 15-meg hard disk.
Page 10: Major Assemblies, Tandy 6000/6000-Hd
Service Manual TANDY 6000/6000-HD ---------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ------------------------------------------------------------------- Figure 1-1. Major Assemblies, TANDY 6000/6000-HD - 2 -...
Page 11 Sound PCB that is responsible for generating an audible tone when key closure is achieved. The other assemblies of the TANDY 6000/6000-HD are mounted to the Base Assembly. The Base Assembly has rubber feet to protect the surface on which the TANDY 6000/6000-HD is placed for operation.
Page 12 RF interference by the switching power supply or video display. It mounts two slim line floppy Disk Drive assemblies (TANDY 6000), or one slim line floppy Disk Drive and one 15 Megabyte Hard Disk (TANDY 6000-HD). The 6000-HD is supplied with one floppy disk and One hard disk.
Page 13 Bezel surface. The Video Monitor PCB forms the Video Monitor Assembly for the TANDY 6000/6000-HD. The Video Monitor PCB is mounted on the inside on the Base Assembly. Signal and power cables interconnect it with the Video/Keyboard Interface PCB and Power Supply Assembly on the Electronics Module.
Page 14 Service Manual TANDY 6000/6000-HD ---------------------------------------------------------------------- TANDY COMPUTER PRODUCTS -------------------------------------------------------------------- - 6 -...
Page 15: 2/ Technical Specifications
Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Technical Specifications Physical Characteristics 2.1.1 Case/Bezel/Base Assembly Width 21.0 inches (53.3 cm) Height 13.5 inches (34.3 cm) Depth 20.5 inches (52.1 cm) Weight 49.9 pounds (22.5 kgm) 2.1.2 Keyboard Width 18.0 inches (45.7 cm) Height 2.5 inches (6.4 cm)
Page 16 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS --------------------------------------------------------------------- Parallel Interface Connects to a line printer via the 34-pin connector on the back of the display console. See Section 5, Cable Wiring/Pin Designations. Outputs 8 data bits in parallel. Inputs 4 data bits.
Page 17: 3/ Disassembly/Assembly Procedures
Adequate space should be left around the unit to allow sufficient air flow to all components. If the TANDY 6000 has the fan enclosed in a metal housing on the back of the access panel you need to follow the disassembly and assembly instructions in the Model 16B Service Manual (See Figures 5-2 and 5-3).
Page 18 TANDY 6000/6000-HD Service Manual TANDY COMPUTER PRODUCTS -------------------------------------------------------------------- -- Figure 3-1. Cover Assembly and Bezel Assembly Mounting Screws - 10 -...
Page 19 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS --------------------------------------------------------------------- 3.2 Bezel/CRT Assembly Removal Loosen the three (3) screws at the front of the unit that attach the Bezel/CRT Assembly to the Base Assembly. See Figure 3-1, which shows the location of these screws.
Page 20 Service Manual TANDY 6000/6000-HD --------------------------------------------------------------------- TANDY COMPUTER PRODUCTS -------------------------------------------------------------------- Remove the two left mounting nuts and washers that attach the CRT Monitor PCB bracket to the Bezel/CRT Assembly and remove the bracket and board from the assembly. Remove the other two nuts and washers from the CRT.
Page 21 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS -------------------------------------------------------------------- 3.5 CRT Monitor PCB Remove the 10 Pin Edge Connector. Remove the four (4) screws which attach the CRT Monitor PCB to the bracket. Re-assemble in the reverse order. 3.6 Drive Support Structure...
Page 22 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ------------------------------------------------------------------ If a drive is to be replaced, remove the front bezel removing the mounting screws (two at the top and two the bottom front lip). 10. Remove the Hard Disk Drive from the support structure by removing the two screws at the lower left of the drive support structure and the three nuts at the lower left.
Page 23: Electronics Module Assembly
Service Manual TANDY 6000/6000-HD —--------------------------------------------------------------- TANDY COMPUTER PRODUCTS — —------------------------------------------------------------- Figure 3-2. Electronics Module Assembly - 15 -...
Page 24 TANDY 6000/6000-HD Service Manual TANDY COMPUTER PRODUCTS ------------------------------------------------------------------ Disconnect the grounds from the two cables attached to the Video/Keyboard Interface PCB on the grounding lugs of the RH Board Retainer. Remove the PC Board Retainers (one on each side) that secure the PCBs in the Mother Board assembly.
Page 25 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS --------------------------------------------------------------------- 17. Remove the Mother Board assembly from the Electronics Module chassis. 18. Remove the Power Supply Assembly from the Electronics Module chassis by removing two screws at the left and right rear of the Power Supply and two screws at the front vertical lip.
Page 26 Service Manual TANDY 6000/6000-HD ---------------------------------------------------------------------- TANDY COMPUTER PRODUCTS -------------------------------------------------------------------- Keyboard The Keyboard Assembly is a separate assembly that is attached to the main computer unit by a five-wire cable terminated in a DIN plug. A coiled cable assembly allows the keyboard to be separated from the main computer unit by up to three feet.
Page 27: 4/ Adjustments
TANDY COMPUTER PRODUCTS --------------------------------------------------------------------- Adjustments The only adjustments on the TANDY 6000/6000-HD Microcomputer are associated with the Floppy Disk Drive Interface and are required to be made only if disk drives are changed or components have drifted due to aging.
Page 28 Service Manual TANDY 6000/6000-HD --------------------------------------------------------------------- TANDY COMPUTER PRODUCTS -------------------------------------------------------------------- Figure 4-1. Adjustments - 20 -...
Page 29 DISKDG8 (You will need one or two blank double-sided diskettes to run this rest.) 15. If the test is completed correctly, reassemble the TANDY 6000/6000-HD mechanical components in the reverse order of disassembly noted at the first part of this procedure or reinstall the cards removed.
Page 30 Service Manual TANDY 6000/6000-HD ---------------------------------------------------------------------- TANDY COMPUTER PRODUCTS --------------------------------------------------------------------- - 22 -...
Page 31: 5/ Cabling Diagrams/Pin Designations
TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Cabling Diagrams/Pin Designations Contained in this section is a cable block diagram of the TANDY 6000/6000-HD System, and pin designations of all the connectors of the TANDY 6000/6000-HD. The Video/Keyboard Interface PCB plugs into the Mother Board.
Page 32 Service Manual TANDY 6000/6000-HD ---------------------------------------------------------------------- TANDY COMPUTER PRODUCTS -------------------------------------------------------------------- - 24 -...
Page 33: Floppy Disk Drive Version 1
Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS Figure 5-2. Cable Wiring/Cable Location - Floppy Disk Drives Version 1 - 25 -...
Page 34: Hard Disk Drive Version 1
Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Figure 5-3. Cable Wiring/Cable Location - Hard Disk Drives Version 1 - 27 -...
Page 35 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Figure 5-4. Cable Wiring/Cable Location - Floppy Disk Drives Version 2 - 29 -...
Page 36 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Figure 5-5. Cable Wiring/Cable Location - Hard Disk Drives Version 2 - 31 -...
Page 37 Service Manual TANDY 6000/6000-HD ---------------------------------------------------------------------- TANDY COMPUTER PRODUCTS --------------------------------------------------------------------- Cable Assembly 8000876, RS-232 Serial Interface Main PCB Connector Pl/Jl Rear Input Channel A Pin Number Description Name Power Ground No Connection Transmit Data, Channel A TDCA TSET Transmit S.E.T. RDCA...
Page 38: Rs-232 Serial Interface Cable
Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS -------------------------------------------------------------------- Figure 5-6. RS-232 Serial Interface Cable Figure 5-7. Line Printer/Parallel Output Cable - 34 -...
Page 39 Service Manual TANDY 6000/6000-HD ---------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Cable Assembly 6000877, Line Printer/Parallel Output Wiring for this cable is pin to pin from one connector to the other. Main PCB P2/J2 to Rear Input Line Printer Description Signal PSTB...
Page 40: Fdc To Internal Drive Cable
Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ------------------------------------------------------------------- Cable Assembly 6000878, FDC to Internal Drive Wiring is pin to pin from one connector to the other. Main PCB P3/J3 to Floppy Diskette Drive(s) Name Description LOCURI* Reduced Write Current 4,6,8 [ No Connection —...
Page 41: Video/Keyboard Pcb To Keyboard Cable
Service Manual TANDY 6000/6000-HD ---------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Cable Assembly 6000879, Video/Keyboard PCB to Keyboard Video/Keyboard Interface P2/J2 Keyboard Receptacle Name Description Data from Keyboard DATA No Connection CLOCK Clock From Keyboard BUSY Busy to Keyboard +5 Volt No Connection System Ground Figure 5-9.
Page 42: Dc Power Cable
Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ------------------------------------------------------------------ Cable Assembly 6000880, DC Power to System This cable supplies DC power from the Power Supply to the Disk Drives, the CRT Monitor PCB, and the Mother Board. also supplies +5 volts (at pin 8) to the Keyboard via the keyboard connector on the front panel of the Base Assembly.
Page 43: Ac Input Cable
TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Cable Assembly 6000885, AC Input This cable assembly provides switched AC input from the Rear Connector Panel/Fan Support of the TANDY 6000/6000-HD to the Power Supply Assembly. A terminal junction in the circuit after the switch also supplies power to the cooling fan mounted on the Rear Connector Panel/Fan Support.
Page 44 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ------------------------------------------------------------------ Cable Assembly 6000887, I/O Processor Board to Sound Board This cable assembly interconnects the I/O Processor PCB to the Sound Board located at the left front corner of the Base Assembly. The cable is symmetrical and may be connected at either end to the Sound Board.
Page 45: Video Cable
Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Harness Assembly 6000888, Video The Video Harness contains the wiring that supplies +12 volts to the Video Monitor Assembly, wiring to the brightness and contrast controls mounted on the Base Assembly, and control circuitry from the Video/Keyboard Interface PCB.
Page 46 The Fan Harness consists of a twisted pair that picks up AC power at the terminal strip on the Power Supply Assembly. It is controlled by the ON-OFF switch located at the left underside lip of the TANDY 6000/6000-HD Base Assembly. - 42 -...
Page 47 Service Manual TANDY 6000/6000-HD ----------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ----------------------------------------------------------------------- Pin Designations, I/O Processor Board JO, and all Mother Board Connector Positions This connector accepts the Motherboard Assembly. Signal Description 68INTRQ 68000 to Z80 Interrupt Request USERl User Definable Power Ground...
Page 48 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS -------------------------------------------------------------------- Pin Designations I/O Processor Board JO, and all Mother Board Connector Positions (con't) Signal Description DMA Transfer Request (in) XFERRQ Keyboard Interrupt Request (in) KBIRQ* SELECT* Keyboard Selected (out) 4MHz System Clock (out)
Page 49 Service Manual TANDY 6000/6000-HD --------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Pin Designations, I/O Processor Board Jl Description Signal Data Bit 1 Inverted (input/output) BDl* Data Bit 0 Inverted (input/output) BDO* Data Bit 3 Inverted (input/output) BD3* Data Bit 2 Inverted (input/output)
Page 50 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS -------------------------------------------------------------------- BA20* Address Bit 20 Inverted (output) BA23* Address Bit 23 Inverted (output) BA22* Address Bit 22 Inverted (output) Pin Designations, I/O Processor Board J2 Signal Description BVMA* Bus Valid Memory Address Signal Ground...
Page 51: 6/ Troubleshooting Procedures
OFF, then connect the unit to the AC source and continue. 6.1.2 Power-on Diagnostics When the power switch on the TANDY 6000/6000-HD is turned ON, the microprocessor starts executing the program in the BOOTSTRAP ROM. This program is divided into several sections that are executed in order if the previous section passed.
Page 52 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ------------------------------------------------------------------- Check ROM integrity by calculating checksum and comparing it against a value in the ROM. If it matches, continue. If there is a mismatch, the unit will print "BOOT ERROR CK" and stop.
Page 53 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS --------------------------------------------------------------------- If everything is in order, then the controller is directed to read data from track 0 and place it in the RAM . If a "record" is not found (no properly formatted data was readable from disk), the message "BOOT ERROR TK"...
Page 54 TANDY 6000/6000-HD Service Manual TANDY COMPUTER PRODUCTS -------------------------------------------------------------------- does not exist or is bad, the loading process may not be completed and no error messages will be displayed. machine "hangs up" with "LOADING" message in the upper left corner of the CRT.
Page 55 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- TEST PROCEDURES The following is a list of software routines that will thoroughly test the I/O Processor system. SYSTEM - Version dated 11/29/1982, Tests SIO (serial channels A, B ) , PIO (printer I/F, external floppy I/F), DMA and Z80 interrupts and bus structure.
Page 56 CPU and memory boards and rerun the Model II diagnostics to verify the problem area. If it is determined that the problem area is in the TANDY 6000/6000-HD MC68000 CPU or 512K/1 Meg Memory Board, use the following troubleshooting chart for locating the trouble.
Page 57: Interrupt Inputs
Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Possible Recommended Diagnostics Condition Fault Action 6000/6000-HD Test locked up Interrupt Check interrupt Interrupt on software in circuit controller U15, Test terrupt ICs U 3 4 ,40,26. MC68000 CPU Replace MC68000 Clock Logic...
Page 58 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ------------------------------------------------------------------- Possible Recommended Condition Fault Action Diagnostics 6000/6000-HD Random errors I/O decoding Check I/O and and strobes Offset Limit strobe circuit Test Mother Board Troubleshooting Possible Recommended Condition Fault Action Diagnostics 6000/6000-HD Bad RAM...
Page 59: 7/ Theory Of Operation
Theory of Operation 7.1 Mother Board The mother board contains seven receptacles into which optional boards for the TANDY 6000/6000-HD are plugged. connector receptacles are numbered from Jl through J7, beginning at the bottom of the board. The power supply input connector, P 5 , plugs into receptacle J8 at the RH side of the board.
Page 60 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS Component Location, Mother Board 8897701 - 56 -...
Page 61 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Circuit Trace, Mother Board 8897701, Component Side - 57 -...
Page 62 TANDY 6000/6000-HD Service Manual TANDY COMPUTER PRODUCTS ------------------------------------------------------------------- Circuit Trace, Mother Board 8897701, Solder Side - 58 -...
Page 63 Service Manual TANDY 6000/6000-HD --------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Parts List, Mother Board, 8897701 Ref No. Description Part No. PCB, Mother Board 8709318 Capacitors Capacitor, 0.1 uF, 50V, Mono Axial 8374104 Capacitor, 0.1 uF, 50V, Mono Axial 8374104 Capacitor, 0.1 uF, 50V, Mono Axial...
Page 64 Service Manual TANDY 6000/6000-HD ---------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ------------------------------------------------------------------- - 60 -...
Page 65: Mc68000 Cpu Board
"Negate" or "negation" indicates a false or inactive state. 7.2.1 Central Processing Unit (CPU) The TANDY 6000/6000-HD CPU board uses the Motorola MC68000, which contains 16 data lines, 23 address lines, and 20 control lines. Data Lines The data lines (KD0-KD15) are interfaced to the bus via transceivers U12 and U13 (AMD 8303s).
Page 66 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ------------------------------------------------------------------- The active-high state of DBTR enables the data drivers. follows, therefore, that the data receivers are disabled when: A read or write is in progress from the Interrupt Controller chip (INTCS*) A board interrupt acknowledge sequence is in progress...
Page 67 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- The Bus AS* (BAS*) is a delayed AS* which is required to allow the extra time needed for address checking of the memory management unit. AS* is delayed through 4 74F32s to generate GAS*, which is interfaced to the bus by U14.
Page 68 (i.e., Z80A, CPU, or DMA). The MC6800 Peripheral Interface lines are not currently implemented in the TANDY 6000/6000-HD operation. System Control Lines The System Clock input (CLK) to the MC68000 CPU is driven by a 8 MHz output of the clock logic (PCLOCK).
Page 69 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- HALT* is also a bidirectional signal. When the Z80A I/O port latch asserts HALT*, the MC68000 CPU will stop at the end of the current bus cycle. If HALT* is asserted by the MC68000 CPU, it indicates the processor has stopped, as in the case of a double bus fault.
Page 70 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ------------------------------------------------------------------------ Bit Number Option Priority Mode Vector Selection Interrupt Mode GINT Polarity IREQ Polarity Selects internal register to be read on subsequent read operation Selects internal register to be read on subsequent read operation Master mask bit that enables or dis...
Page 71 Service Manual TANDY 6000/6000-HD --------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Interrupt Description Vector Location C0NT4* Initiated by the Z80A 234H C0NT5 * Initiated by the Z80A 238H C0NT6* Initiated by the Z80A 23CH ADERR* Address error, generated by the 240H memory management unit when a user attempts memory access outside the defined range.
Page 72 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ------------------------------------------------------------------------ Additionally, two control ports must be initialized to determine the addresses involved and the mode of the transfer. The two ports are described in the tables and text below. Upper Address Latch (port ODFH)
Page 73 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS --------------------------------------------------------------------- Two Modes are available for transferring data between the MC68000 and the Z80A memory. These are the Byte Mode and the Burst Mode which are controlled by bit 0 of the Transfer Control Latch (Port ODEH).
Page 74: Read And Write Cycle Timing
Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS — — _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ F i g u r e 7 - 1 . Read and Write Cycle Timing...
Page 75: Write Cycle Timing
Service Manual TANDY 6000/6000-HD ■ - ----------------- — -------------------------- - - -------------- TANDY COMPUTER PRODUCTS ------- — _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ F i g u r e 7 - 2 .
Page 76: Read Cycle Timing
Service Manual TANDY 6000/6000-HD ■ -------- — ---------- TANDY COMPUTER PRODUCTS ---------------------------------- — _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Figure 7-3. Read Cycle Timing...
Page 77: Refresh Cycle Timing Of 68000
Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS Figure 7-4. Refresh Cycle Timing of 68000 - 73 -...
Page 78 Service Manual TANDY 6000/6000-HD TANOY COMPUTER PRODUCTS ------------------------------------------------------------------- Details of Control Outputs (port ODEH) B U R ST Byte Mode enabled Burst Mode enabled CONTI Enables Z80A to initiate memory transfers to or from MC68000 memory space Transfers by Z80A disabled...
Page 79 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Write protection for the memory outside a user's partition is provided. Accesses outside of the user's defined partition result in the generation of a bus error exception. An interrupt can also be generated if the interrupt controller is properly initialized.
Page 80 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS -------------------------------------------------------------------- The source of the user extent address is selected by A23 and the signal MMA (memory management active) determines which set of buffers (U31 or U30) drive the address bus. If MMA is high, the user effective address is driven to the bus by U31.
Page 81 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS --------------------------------------------------------------------- The sources for the four levels are Refresh Request (REFRQ*), Bus Request 2 (BR2*), Bus Request 1 (BRl*), and Bus Request 0 (BRO*), with REFRQ* having the highest priority and BRO* the lowest.
Page 82: Bus Arbitration Circuit Timing
Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Figure 7-5. Bus Arbitration Circuit Timing 7.2.6 Data Transfer Acknowledge Logic Data Transfer Acknowledge (DTACK*) is the asynchronous handshake signal used by memory and peripheral devices to complete a bus cycle. When BDTACK* is asserted during a...
Page 83: Onboard Bdtack Generation
Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- If RIP* is asserted, an interrupt acknowledge cycle is in progress and the interrupt vector data is valid from the interrupt controller chip U 1 5 . IODTACK* and RIP* are ORed together at U8 pins 9 and 10 and the resultant output at U8 pin 8 clocks a low into the D flip-flop (1/2 of U4 9 ) .
Page 84: Memory-Mapped I/O Locations
Memory management registers Z80A interrupt (NOT implemented in the Model II upgrades) All other I/O devices and peripherals in the TANDY 6000/6000-HD are still controlled by the Z80A CPU. The main I/O decoding is managed by chip U48, which is the I/O controller.
Page 85: I/O Controller Timing
Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Address Function 7800D0 Interrupt controller data register 7800D1 Interrupt controller command register 7800D2 Limit register two 7800D3 Offset register two 7800D4 Limit register one 780OD5 Offset register one 7800D6 Interrupt request to Z80A...
Page 86: Memory Map
Service Manual TANDY 6000/6000-HD ---------------------------------------------------------------------- TANDY COMPUTER PRODUCTS -------------------------------------------------------------------- Table 7-3 outlines the memory map of the MC68000 subsystem: SYSTEM RAM Total Bytes End Address Start Address Total Available RAM Space in Supervise Mode 6FFFFF 7 MEG 000000 Total Available Protected RAM Space in User Mode...
Page 87 Service Manual TANDY 6000/6000-HD --------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- 7.2.9 Refresh Logic The refresh logic provides the necessary timing and control for generating the refresh pulses required for the dynamic RAMs on the MC68000 memory board(s). It provides refresh by becoming the bus master and supplying the refresh strobe REFRSH.
Page 88: Timing For Refresh Logic
Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS - Figure 7-8. Timing for Refresh Logic 7.2.10 CPU PAL Pin Assignments and Equations PAL 16R4 (U48) Pin Assignments: 8 MHZ / SRW KA19 VM2AD /RESET /IORQ /DTACK Equations: IF (VCC) DTACK = / B * C * D * A S *...
Page 89 TANDY 6000/6000-HD Service Manual TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- * C * D * AS * VM2AD * KA19 */RESET * VM2AD * KA19 * AS */RESET := /B */C * AS * VM2AD * KA19 * SRW */RESET + /B * C */D...
Page 90 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS --------------------------------------------------------------- — := /RESET* BGACK* BRl*/REFRQ*/BR2* REFG + /RESET* BGACK* BRl*/REFRQ*/BR2* BG2 + /RESET* BGACK* BRl*/REFRQ*/BR2* BGO*/BRO + /RESET* BGACK* BRl*/REFRQ*/BR2*/BG2*/BG0*/REFG + /RESET* BGACK* BRl* BGl := /RESET* BGACK* BRO*/REFRQ*/BR2*/BRl* REFG + /RESET* BGACK* BRO*/REFRQ*/BR2*/BRl* BG2...
Page 91 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- PAL 16L8 (U40) Pin Assignments: IB 1C ID REFRSH REFGL MODE RESET 2A 2B GND 2C RFQTR /XO /XI /X2 /REFRQCLR /REFTR 18 19 VCC Equations: IF(VCC) REFRQCLR = /RESET* X2*/Xl*/X0 RESET...
Page 92 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ------------------------------------------------------------------ Component Layout, MC68000 CPU Board 8709573 - 88 -...
Page 93 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Circuit Trace, MC68000 CPU Board 8709573, Component Side...
Page 94 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ------------------------------------------------------------------ Circuit Trace, MC68000 CPU Board 8709573, Layer 2 - 90 -...
Page 95 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Circuit Trace, MC68000 CPU Board 8709573, Layer 3 - 91 -...
Page 96 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS -------------------------------------------------------------------- Circuit Trace, MC68000 CPU Board 8709573, Solder Side - 92 -...
Page 97 Service Manual TANDY 6000/6000-HD --------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ------------------------------------------------------------------------ Parts List, MC68000 CPU Board, 8898855 Ref No. Description Part No. PC Board, CPU (Rev A) 8709573 Capacitors C1-C8 Capacitor, 0.1 uF, 50V, Mono-Axial 8374104 Cll-18 Capacitor, 0.1 uF, 50V, Mono-Axial...
Page 98 Service Manual TANDY 6000/6000-HD ---------------------------------------------------------------------- TANDY COMPUTER PRODUCTS -------------------------------------------------------------------- Parts List, MC68000 CPU Board, 8898855 Ref No. Description Part No. Resistors R17,R18 Resistor, 4.7 kohm, 1/4W, 8207247 Resistor, 4.7 kohm, 1/4W, 8207247 Resistor, ohm, 1/4W, 8207156 Resistor, ohm, 1/4W, 8207022...
Page 99 Service Manual TANDY 6000/6000-HD --------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Parts List, MC68000 CPU Board, 8898855 Ref No. Description Part No. Intergrated Circuits 74F240 8-Bit Buffer Inv, 20-Pin 8015240 74LS123 Dual Mul., 16-Pin 8020123 7416 Hex Invert Buf Driv, 14-Pin 8000016...
Page 100 Service Manual TANDY 6000/6000-HD ---------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ------------------------------------------------------------------- - 96 -...
Page 101 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Schematic, MC68000 CPU Board, 8000247, Page 1 or 3 - 97 -...
Page 102 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Schematic, MC68000 CPU Board, 8000247, Page 2 or 3 - 99 -...
Page 103 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS -------------------------------------------------- — _ _ ... — Schematic, MC68000 CPU Board, 8000247, Page 3 or 3 - 101 -...
Page 104: Memory Board
1 (0, 2, 4, 6, or 8), the parity bit will equal 1, making the total number of bits equal 1 or ODD parity. Otherwise, the parity bit equals 0 or EVEN. The TANDY 6000/6000-HD Memory Board can be functionally divided into four main parts: Memory Address Circuits...
Page 105 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS -------------------------------------------------------------------- Two particulars of dynamic RAMs are address multiplexing and refresh. There are 16 address lines required to access 64K DRAMs and 18 address lines are required for 256K DRAMs. Address line AO, internal to the MC68000 CPU, is used to distinguish between upper (if A0=1) and lower (if A0=0) bytes.
Page 106 Service Manual TANDY 6000/6000-HD --------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Address lines Al7 and A19 are optionally jump connected to the select input of U24 (74F158). This selects which row of RAM is to be read or written to during a memory cycle. When...
Page 107 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ------------------------------------------------------------------ Taps, 0, 140, and 180 of the Delay Line are used to generate BDTACK*. Each tap after 0 will insert 2 wait states in the memory cycle to enable the use of slower DRAMs. 150ns DRAMs are required for no wait state operation.
Page 108: Memory Map Select Tables
Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS --------- — _ _ _ _ _ (B18) (Bl9)(B22) (B20) (B21 Disable Board 000000-03FFFF 040000-07FFFF 080000-0BFFFF 0C0000-0FFFFF 100000-13FFFF 140000-17FFFF 180000-lBFFFF 1C0000-1FFFFF 200000-23 FFFF 240000-27FFFF 280000-2BFFFF 2C0000-2FFFFF 300000-33FFFF 340000-37FFFF 380000-3BFFFF 3C0000-3FFFFF 400000-43FFFF 440000-47FFFF 480000-4BFFFF...
Page 109 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ------------------------------------------------------------------ (BA19) (BA22) (BA20) (BA21) Disable Board 000000-07FFFF 080000-0FFFFF 100000-17FFFF 180000-lFFFFF 200000-27FFFF 280000-2FFFFF 300000-37FFFF 380000-3 FFFFF 400000-47FFFF 480000-4FFFFF 500000-57 FFFF 580000-5FFFFF 600000-67 FFFF 680000-6FFFFF 512K Board Jumpers E1-E2 E5-E6 256K E7-E8 256K 512K Memory Map Select Table...
Page 110 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- 7.3.4 Parity There are two parity circuits: Input parity generators Output parity checkers Since there is byte parity, there is one parity bit for each byte. When data is being written to a memory location, the data is monitored by the input parity generators.
Page 111 Service Manual TANDY 6000/6000-HD ---------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ------------------------------------------------------------------ - 110 -...
Page 112 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Component Layout, 512K Memory Board - Ill -...
Page 113 Service Manual TANDY 6000/6000-HD ---------------------------------------------------------------------- TANDY COMPUTER PRODUCTS -------------------------------------------------------------------- Circuit Trace, 512K Memory Board, Component Side - 112 -...
Page 114 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Circuit Trace, 512K Memory Board, Solder Side - 113 -...
Page 115 TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS Parts List, Memory Board, 8898854 Ref No. Description Part No. 8709572 6000 Memory PC Board Rev. A Cable, 34 Pos, Int. Bus. Ext. II 8709391 8709387 Cable, 50 Pos, Int. Bus. Ext. II Capacitors Capacitor,...
Page 116 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS Parts List, Memory Board, 8898854 Ref No. Description Part No, Integrated Circuits 74F521, Comparator 20-Pin 8015521 U2-4 I C , 74S240, Octal Bus Line Driver, 20-Pin 8015240 U5-8 IC,74ALS240, 20-Pin 8025240 74F244, Octal Buffer,...
Page 117 Service Manual TANDY 6000/6000-HD ---------------------------------------------------------------------- TANDY COMPUTER PRODUCTS -------------------------------------------------------------------- - 116 -...
Page 118 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Schematic, Memory Board, 8000229, Page 1 of 2 - 117 -...
Page 119 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Schematic, Memory Board, 8000229, Page 2 of 2 - 119 -...
Page 120: 7.4 Main Logic Board
Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- 7.4 Main Logic Board The Main Logic board is a complete eight-bit microprocessor system minus the video interface. The board features the Z80A family of ICs which provides two serial communications channels (RS-232), a printer interface (parallel) and DMA capability.
Page 121: I/O Processor Pcb Block Diagram
Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS -------------------------------------------------------------------- Figure 7-9. I/O Processor PCB Block Diagram - 1 2 2 -...
Page 122 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS --------------------------------------------------------------------- comparator triggers when C3 is charged to generate a pulse of at least 100 microseconds. On a "manual" reset (front panel switch), a third comparator generates a pulse longer than the (normal) switch bounce.
Page 123 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS -------------------------------------------------------------------- Buffers The CPU and DMA are bus masters; they transmit the address and control signals onto the bus. Data is both transmitted and received by all entities on the bus. *Address buffers (U24,U25)- Disabled only if external bus...
Page 124: Input/Output Port Map
Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Table 7-5. Input/Output Port Map - 125 -...
Page 125 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ------------------------------------------------------------------ Table 7-5. Input/Output Port Map (con't) - 126 -...
Page 126 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Interrupt Control The CPU has two types of interrupts; maskable (INT/) and non-maskable (NMI/). The non-maskable interrupt (bus name NMIRQ*) is a Method 1 type interrupt (see Z80 specification). The sources for this signal are on the BUS only.
Page 127 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ------------------------------------------------------------------ Table 7-6. Memory Map - 128 -...
Page 128 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- RACO through RAC5 are usable for 16K and 64K RAMs, both banks. Unique address combinations are 16RAC6 (16K only, address bit 6), 64RAC6 (64K only, address bit 6), L64RAC7 (lower 64 address bit 7), and U64RAC7 (upper 64K address bit 7).
Page 129: Jumper Options
Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ------------------------------------------------------------------- ROM SIZE OPTION E I8 , EI9, E20 EI8-EI9 2 K x 8 ROM A U = + 5 V EI9- E20 4 K * 8 ROM All = All FLOPPY DRIVE HEAD LOAD DELAY OPTION...
Page 130 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- RAM WAIT STATE OPTIONS E l, E 2 , E3 E I- E 2 WAIT STATE INSERTED DURING CYCLE NO WAIT STATES E 2 -E 3 CLOCK OSCILLATOR OPTION E 4 , E5...
Page 131 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ------------------------------------------------------------------- RAM UPPER BANK SIZE OPTION £50, E5I, £52 E50- E52 6 4 K S I Z E I6 K SIZE E 5I-E52 OPTIONS SERIAL CHANNEL A £53, E54, E55 RECEIVE BAUD CLOCK...
Page 132 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- TIMING/CONTROL The TIMING/CONTROL subsection (schematic, sheet 5, 6) provides the necessary signals to access the memory and control the data transceiver. This circuity includes the memory controller U50, RAM timing generator circuit U39,...
Page 133 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS --------------------------------------------------------------------- The ROM timing seguence is simply (MREQ*ROMSEL) = ROMCE/; chip select and (ROMSEL*READ) = ROMOE/; output enable. REFRESH clears ROMSEL during refresh. BUFFERS The address buffers U42-43 receive the addresses from the BUS and apply them to the multiplexers, ROM and the memory controller.
Page 134 Service Manual TANDY 6000/6000-HD --------------------------------------------------------------------- TANDY COMPUTER PRODUCTS --------------------------------------------------------------------- The PIO is the Z80A PARALLEL INPUT/OUTPUT CONTROLLER. provides two parallel data interfaces; one is used as the data port for the printer and the other is used as an input port for status from the Floppy Disk Drive and Printer.
Page 135 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS --------------------------------------------------------------------- SOUND The SOUND function is an oscillator of fixed frequency and variable duration under software control. The oscillator is located on a separate satellite board. Power and tone duration control are provided by the I/O Processor PCB.
Page 136 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- PAL 12L6 (UlO) Pin Assignments: READ CAO CAl CA2 CA3 CA4 CA5 CA6 CA7 GND IORQ WRITE SELECT FB SYSCFG MEMCFG DMARD OPSCFG F8IO VCC Equations: /MEMCFG = CA7*CA6*CA5*CA4*CA3*CA2*CA1*CAO*/IORQ*/WRITE ;FF*IORQ/*WRITE/ SYSMCFG = CA7*CA6*CA5*CA4*CA3*/CA2*/CA1*CAO*/IORQ*/WRITE ;F9 *IORQ/*WRITE/...
Page 137 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS -------------------------------------------------------------------- PAL 16L8 (U21) Pin Assignments: PA7 PIORQ PA6 PA4 PA5 PA2 PA3 PAO PAl GND PWRITE CTCCE SIOCE PIOCE FDCCE SOFTMR DRVSEL SNDCE PGSEL VCC Equations: IF (VCC) /CTCCE = PA7 *PA6 *PA5 *PA4 */PA3 */PA2 * ;...
Page 138 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS --------------------------------------------------------------------- PAL 16R6 (U47) Pin Assignments: CLOCK PD6 PD7 PDO PDl PD3 PD2 2DRVIN RST GND GND MOTOR DDENP SIDESEL DS3 DS2 DSl DSO INTERNAL VCC Equations: /DSO :=/PD0*PDl*PD2*PD3*RST ;SELECT DRIVE #0 /DSl := PD0*/PDl*PD2*PD3*RST ;SELECT...
Page 139 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS -------------------------------------------------------------------- RASENO: Controls Access to Primary 64K TRSDOS Operation- 0-32K Base, Not Switchable 32-64K Switchable Address Range 0-32: RASENO = RFSH* LOWP* A15* Address Range 32-64K: RASENO = RFSH* LOWP* A15 BANKO* PAGE VIDEN*...
Page 140 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS --------- — -------------------------------------------------------- Component Layout, I/O Processor PCB 8898423 - 141 -...
Page 141 Service Manual TANDY 6000/6000-HD ------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ------------------------------------------------------------------- - 142 -...
Page 142 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Circuit Trace, I/O Processor PCB 8898423, Solder Side - 143 -...
Page 143 Service Manual TANDY 6000/6000-HD ----------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ------------------------------------------------------------------------ Parts Lists, I/O Processor PCB, 8898423(11/17/82) Part No. Ref.No. Description 8374104 Capacitor, 0.1 uF, 8374104 Capacitor, 0.1 uF, 8325101 Capacitor, 1 uF, 16V, Elec Rad 8326101 Capacitor, 10 uF, 16V, Elec Rad...
Page 144 Service Manual TANDY 6000/6000-HD --------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ------- — ---------------------------------------------------------- Parts Lists, I/O Processor PCB, 8898423(11/17/82) Ref.No. Description Part No. Capacitor, 0.1 uF, 8374104 Capacitor, 0.1 uF, 8374104 Capacitor, 0.1 uF, 8374104 Capacitor, 0.1 uF, 8374104 Capacitor, 10 uF,...
Page 145 Service Manual TANDY 6000/6000-HD ----------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ------------------------------------------------------------------------ Parts Lists, I/O Processor PCB, 8898423(11/17/82) Part No. Ref.No. Description 8374104 Capacitor, 0.1 uF, Capacitor, 0.1 uF, 8374104 Capacitor, 0.1 uF, 8374104 Capacitor, 0.1 uF, 8374104 8374104 Capacitor, 0.1 uF, Capacitor,...
Page 146 Service Manual TANDY 6000/6000-HD --------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Parts Lists, I/O Processor PCB, 8898423(11/17/82) Ref.No. Description Part No. MC1489 Quad Line Receiver 9050189 74LS04 Hex Inverter 9020004 7407 Hex Buffer 9000007 Z80A DMA 8047883 74LS20 Dual 4-In NAND 9020020...
Page 147 Service Manual TANDY 6000/6000-HD --------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ------------------------------------------------------------------ Parts Lists, I/O Processor PCB, 8898423(11/17/82) Ref.No. Part No. Description 74S112 Flip-Flop 9010112 IC, 16K DRAM 8040016 IC, 16K DRAM 8040016 IC, 16K DRAM 8040016 IC, 16K DRAM 8040016 IC, 16K DRAM...
Page 148 Service Manual TANDY 6000/6000-HD ----------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ------------------------------------------------------------------------ Parts Lists, I/O Processor PCB, 8898423(11/17/82) Ref.No. Description Part No. Resistor, lk ohms, 1/4W, 8207210 Resistor, 4.7k ohms, 1/4W, 8207247 Resistor, 1.2k ohms, 1/4W, 8207212 Resistor, 220 ohms, 1/4W, 8207122 Resistor,...
Page 149 Service Manual TANDY 6000/6000-HD --------------------------------------------------------------------- TANDY COMPUTER PRODUCTS --------------------------------------------------------------------- Parts Lists, I/O Processor PCB, 8898423(11/17/82) Part No. Ref.No. Description Resistor Paks Resistor Pak, 2.2k ohms, SIP 10-Pin 8290031 8290032 Resistor Pak, 10k ohms, SIP 6-Pin 8290034, Resistor Pak, 56k ohms, DIP...
Page 150 Service Manual TANDY 6000/6000-HD --------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Parts Lists, I/O Processor PCB, 8898423(11/17/82) Ref.No. Description Part No. Staking Pins Staking Pin 8529014 Staking Pin 8529014 Staking Pin 8529014 Staking Pin 8529014 Staking Pin 8529014 Staking Pin 8529014 Staking Pin...
Page 151 Service Manual TANDY 6000/6000-HD ---------------------------------------------------------------------- TANDY COMPUTER PRODUCTS -------------------------------------------------------------------- - 152 -...
Page 152 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS - 153 -...
Page 153 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS - 155 -...
Page 154 Service Manual TANDY 6000/6000-HD ---------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- - 1 5 7 -...
Page 155 Service Manual TANDY 6000/6000-HD — ----------------------------------------------------------------- TANDY COMPUTER PRODUCTS ----------------------------------------------------------------------- - 159 -...
Page 156 Service Manual TANDY 6000/6000-HD ---------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- - 161 -...
Page 157 Service Manual TANDY 6000/6000-HD ---------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- - 163 -...
Page 158: Video/Keyboard Interface Board
Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS --------------------------------------------------------------------- Video/Keyboard Interface Board The Video/Keyboard Interface board has two major functions. One is to control a built-in, high-resolution video monitor capable of displaying 24 lines of either 80 normal characters or 40 expanded characters in both upper and lower cases.
Page 159: Video/Keyboard Interface
Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS Figure 7-10. Video/Keyboard Interface PCB Block Diagram - 166 -...
Page 160 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS --------------------------------------------------------------------- The waveform at pin 8 of Ul resembles a "raw" square wave with a frequency of approximately 12.48 MHz. At pin 2 of the same chip, the signal appears more like a "clean"...
Page 161 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS Figure 7-11. Timing Diagram - 168 -...
Page 162 Therefore, it is up to the designer to choose any screen density desired, for instance 80 x 24, 132 x 20, etc. In the Tandy 6000/6000HD either an 80 x 24 or a 40 x 24 character screen density is used.
Page 163: Mc6845 Pin Identification
Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ------------------------------------------------------------------ The best way to describe the MC6845 controller is to refer to the pin descriptions as noted in Figure 7-12. following paragraphs describe the function of each pin on the CRTC chip.
Page 164 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- processor. It is active when either I/O port FC* or FD* is active (U31r pins 6 and 7). The register select line (RS) is an input that selects either the address register (RS=0) or one of the data registers (RS=1) of the internal register file.
Page 165 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ------------------------------------------------------------------------ The Reset (RES*) input is used to reset the CRTC. It is an active low. When this signal is active, the CRTC is forced into the following status: All the counters in CRTC are cleared and the device stops the display operation.
Page 166: Character Dot Pattern
TANDY 6000/6000-HD Service Manual TANDY COMPUTER PRODUCTS — -------------------------------------------------------------- Figure 7-13. Character Dot Pattern - 173 -...
Page 167 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS -------------------------------------------------------------------- of the character generator. These also cycle binarily, but are incremented with each horizontal retrace time. horizontal retrace time is the period in which the CRT beam returns from the end of a scan line back to the beginning of the next one.
Page 168 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- RAM/VIDEO RAM Select Logic The block labeled RAM/VIDEO RAM Select Logic on the diagram in Figure 7-13 is a decoder. That is, when the CPU is addressing its upper 2K bytes of memory located at F800H through FFFFH, address lines ADll through AD15 become high (active).
Page 169: Port Addressing
Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ------------------------------------------------------- Video Board Select Logic This part of the system is called the port addressing block. It uses the lower eight lines of the address bus as shown by U27 (LS30) for the dual 2 to 4 line decoder (U31 LS155).
Page 170 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ------------------------------------------------------------------------ CD7) if set (1), enables the 2K bytes RAM, disables the upper 2K bytes of the Bank's RAM (F800H to FFFFH) if reset (0), disables Video RAM, enables Bank RAM F800H to FFFFH.
Page 171 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS Bit 6 <D6) 1, Video Display disabled 0, Video Display enabled Bit 5 (D5) RTC interrupt enable Bit 4 (D4) 80*/40 character mode* Bits 3 through 0 (D3-D0) They are "don't care" bits (not used)
Page 172 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ------------------------------------------------------------------------ For the above example, the following equation applies: If we want to Read the Status of Port FF, we activate the FFRD* signal to enable the 3-state buffers LS240, U38. This will produce the status of the KBIRQ*, the BLNKVID*, the 80*/40 character mode*, and the ENABLE RTC INT* as shown at the inputs 2, 4, 6, and 8 of U38.
Page 173: Keyboard Timing Diagram
Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS --------------------------------------------------------------------- Figure 7-14. Keyboard Timing Diagram actual 8 bit word at the output of the shift register (U 6) is buffered into the data bus (in other words, read by the CPU) .
Page 174 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS --------------------------------------------------------------------- The CPU writes a word of data into the Video RAM. The CRT controller, which automatically displays the information represented by Video RAM contents on the Video screen, moves that word and stores it temporarily in the Latch.
Page 175 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ------------------------------------------------------------------- is displayed "not in pieces" but as a single entity. After the eight dot scans are output, the electron beam is turned off and two rows (the 9th and 10th) of blank dots are output.
Page 176 Service Manual TANDY 6000/6000-HD ---------------------------------------------------------------------- TANDY COMPUTER PRODUCTS --------------------------------------------------------------------- Component Layout, Video/Keyboard PCB 8898022 - 183 -...
Page 177 Service Manual TANDY 6000/6000-HD ---------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ------------------------------------------------------------------- Circuit Trace, Video/Keyboard PCB 8898022, Component Side - 184 -...
Page 178 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Circuit Trace, Video/Keyboard PCB 8898022, Solder Side - 185 -...
Page 179 Service Manual TANDY 6000/6000-HD --------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ------------------------------------------------------------------ Parts Lists, Video/Keyboard Interface, 8898022 Part No. Ref. No. Description Capacitors 8303102 Capacitor, 0.01 uF 8374104 Capacitor, 0.1 uF, Capacitor, 1000 pF, 8302104 Capacitor, 0.1 uF, 8374104 8374104 Capacitor, 0.1 uF, Capacitor, 0.1 uF,...
Page 180 Service Manual TANDY 6000/6000-HD --------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Parts Lists, Video/Keyboard Interface, 8898022 Ref No. Description Part No. Resistors Resistor, 470 ohm, 1/4W 5% 8207147 Resistor, 470 ohm, 1/4W 5% 8207147 Resistor, 39k ohm, 1/4W 5% 8207339 Resistor, 4.7k ohm, 1/4W 5%...
Page 181 Service Manual TANDY 6000/6000-HD ----------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ------------------------------------------------------------------------ Parts Lists, Video/Keyboard Interface, 8898022 Part No. Ref No. Description 9020157 IC, SN74LS157NDS 9020161 IC, SN74LS161NDS 9020030 IC, SN74LS30NDS 9020000 IC, SN74LS00NDS IC, SN74LS08NDS 9020008 9020004 IC, SN74LS04NDS 9020155 IC, SN74LS155NDS...
Page 182 Service Manual TANDY 6000/6000-HD ---------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- - 189 -...
Page 183 Service Manual TANDY 6000/6000-HD ---------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- - 191 -...
Page 184: Power Supply Board
TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Power Supply Board 7.6.1 Functional Specifications The Power Supply Assembly for the Tandy 6000/6000HD a 140 watt switching power supply. The Printed Circuit Board is mounted to the electronic chassis bracket. Line input to the power supply module is made through an amp wafer with locking 3-pin socket header.
Page 185 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ------------------------------------------------------------------- Output Voltages 4.95 5.00 5.25 VO 2 11.40 12 .00 12 .60 VO 3 See Notes 26.40 21.60 24.00 -11.40 -12 .00 -12 .60 V04, no load tolerance Note: V03 must not change from its initial value by more than + 100 millivolts under the following load conditions on the V04 output.
Page 186 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Hold Up Time: mSec — — — Full Load Lo Line mSec — — — Full Load Norn Line Insulation Resistance M ohm 1000 — — Input to Output M ohm 1000...
Page 187 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ------------------------------------------------------------------ 7.6.2. Equipment for Test Set-Up Isolation Transformer (minimum of 500 VA rating) CAUTION Dangerously high voltages are present in this power supply. For the safety of the individual doing the testing, please use an isolation transformer.
Page 188: Test Layout, Power Supply
Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS --------------------------------------------------------------------- Output Min Load R for Min Max Load R for Max Amps Amps Load Load Pins +5V V01 1.66 ohm 13.36 .3 4 ohm 8,9, 30 W 130 W 11,12 +12 V02...
Page 189 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS --------------------------------------------------------------------- Visual Inspection Check power supply for any broken, burned, or obviously damaged components. Visually check the fuse. If any questions, check with an ohmmeter. Start-Up Load power supply with minimum load as specified in Table 7-5.
Page 190 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ------------------------------------------------------------------------ Check for B+ Set up power supply and attach the X10 scope probe ground to the cathode side of D 5 . Slowly turn up the power and check for B+ on the cathode side of D9.
Page 191: Voltage And Ripple Specifications
Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ------------------------------------------------------------- —------ 7.6.5 Performance Test Each of these test conditions should be set up and noted to be within the limits specified in Table 7-9. Test Input +5 Load +12 Load +24 Load...
Page 192 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS -------------------------------------------------------------------- Component Layout, Power Supply 8790047 - 201 -...
Page 193 Service Manual TANDY 6000/6000-HD -------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ------------------------------------------------------------------- Parts List, Power Supply 8790047 (Astec Components AA11082) Ref No. Description Mfr. Part No. Capacitors Capacitor, 0.1 uF, 250VAC, 20% 068-10400010 Capacitor, 0.22 uF, 250VAC, 10% 068-22400010 Capacitor, 2200 pF, 400VAC, 20%4)
Page 194 Service Manual TANDY 6000/6000-HD --------------------------------------------------------------------- TANDY COMPUTER PRODUCTS -------------------------------------------------------------------- Parts List, Power Supply 8790047 (Astec Components AA11082) Ref No. Description Mfr. Part No. Coils (con't) Choke Coil Assy 852-20100010 Choke Coil Assy 852-20100010 Filter Choke Coil Assy 852-20100220 852-20100220 Filter Choke Coil Assy...
Page 195 Service Manual TANDY 6000/6000-HD --------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ------------------------------------------------------------------- Parts List, Power Supply 8790047 (Astec Components AA11082) Ref No. Description Mfr. Part No. Jumpers Jumper Wire, 12.7 mm 358-80800001 Jumper Wire, 12.7 mm 358-80800001 Jumper Wire, 12.7 mm 358-80800001 Jumper Wire, 17 mm...
Page 196 Service Manual TANDY 6000/6000-HD --------------------------------------------------------------------- TANDY COMPUTER PRODUCTS — — ---------------------------------------------- - - ------------- Parts List, Power Supply 8790047 (Astec Components AA11082) Ref No. Description Mfr. Part No. Resistors (c o n 't ) Resistor, 56 ohm, 5% 1/4W 240-56006022...
Page 197 Service Manual TANDY 6000/6000-HD ---------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ------------------------------------------------------------------ - 206 -...
Page 198 Service Manual TANDY 6000/6000-HD ---------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- - 207 -...
Page 199: Sound Board
Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Sound Board The Sound PCB is a small board located in the front left corner of the Base Assembly; it is accessible when the Cover/Bezel Assembly is removed from the Base Assembly (see Section 3 for disassembly procedures).
Page 200 Service Manual TANDY 6000/6000-HD --------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ------------------------------------------------------------------ Parts List, Sound PCB, 8898429 Part No. Ref No. Description 8353224 Capacitor, .022 mF, 50V, +50/-10% 8303104 Capacitor, 0.01 mF, 50V Capacitor, 1 mF, 16V Elec Axial 8395111 Capacitor, 0.1 mF, 50V Mono...
Page 201 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Schematic 8000165, Sound Board 8898429 - 211 -...
Page 202: Crt Assembly
TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ------------------------------------------------------------------ CRT Assembly The CRT Assembly on the Tandy 6000/6000HD is supplied from several different manufacturers. The assembly consists of the CRT, the CRT Monitor PCB, which is mounted to the inside of the Cover/Bezel Assembly, and the associated mounting hardware.
Page 203: Keyboard Assembly
TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Keyboard Assembly The keyboard of the Tandy 6000/6000 HD is an 82-key, low profile capacitive keyboard that utilizes an 8021 microprocessor chip. The microprocessor and its associated circuitry scan the key matrix, convert switch closures to an 8-bit digital code and then transmits that code serially to the keyboard interface on the Video/Keyboard Interface PCB.
Page 204 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS Parts List, Low Profile Keyboard 8790522 Ref No. Description Mfr. Part No. Capacitors 32-00333-004 Capacitor, C .033 uF, 25V Capacitor, T 10 uF, 10V 32-00106-010 Capacitor, C .033 uF, 25V 32-00333-004 Capacitor, T...
Page 205 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS Parts List, Low Profile Keyboard 8790522 48-00300-110 XTAL, 3.58 MHz, Dip (Yl) 49-01143-000 Mounting Plate 61-04024-001 Switch, 30mm Capacitor Assy 61-04024-002 Switch, 30mm Capacitor Assy Lt 61-04031-001 Switch, Capacitor 30mm 61-04031-002 Switch, Capacitor 30mm...
Page 206 Service Manual TANDY 6000/6000-HD ---------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ------------------------------------------------------------------- - 2 1 6 -...
Page 207 Service Manual TANDY 6000/6000-HD ---------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- - 217 -...
Page 208: Hard Disk Controller
Hard Disk Controller 7.10.1 System Overview The Tandy 6000 with built in hard disk is identical to the standard 6000, except for the additional 15-meg HD drive, identical to the standard 16B (Cat. No. 26-6004), except for the addition of a 15-megabyte (formatted) hard disk drive, controller PC board, drive power supply, and associated cables.
Page 209 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ------------------------------------------------------------------------ Jumper Location Jumper Location Port Range Decoded Port Range Decoded El to E2 CO to CF El to E3 70 to 7F El to E4 60 to 7F 50 to 5F El to E5...
Page 210 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS -------------------------------------------------------------------- Drive Control and Interface The main device on the controller board is the Western Digital WD1010 (U26). This is a MOS/LSI part that performs the function of drive controller/formatter. The WD1010 is software compatible with WD1000 series controllers with certain minor differences.
Page 211 Service Manual TANDY 6000/6000-HD --------------------------------------------------------------------- TANDY COMPUTER PRODUCTS -------------------------------------------------------------------- data and control signals appear at connectors J3 and J2. utilizing separate control output signal drivers for each drive, the need to terminate only the last logical drive has been eliminated.
Page 212 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- increase in the voltage reference to Vco (TP 3), causing the Vco to speed up. Whenever the Vco is running too fast,the error amp receives pump-down pulses and provides the Vco with an average decrease in control voltage (TP 3) which in turn slows down the Vco.
Page 213 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ------------------------------------------------------------------- Adjust R2 until the DRUN signal just begins to toggle. DRUN may be found on U27-15 for rev A boards or on test point 7 for all other board revisions. This is only a preliminary adjustment and does not need to be exact at this time.
Page 214 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ------------------------------------------------------------------------ CO — Write Protect Register This port is for read only use and only bits D7 and D6 should be looked at. A logic one in location D7 indicates the primary drive is write protected and a logic one in D6 indicates the secondary drive is write protected.
Page 215 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ID not found-set to one if desired cylinder,head,sector, or size cannot be found after 8 disk revolutions or if a CRC error was encountered in the desired ID field Not used-forced to zero...
Page 216 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ------------------------------------------------------------------------ CD — SDH register This is loaded with the desired sector size, drive number, and head number parameters using the following form. Bits Sector Bits Head Size 2 1 0 Selected 0 0 0...
Page 217 7.10.3 Hard Disk Drive The hard disk that is installed in the Tandy 6000 is a 15-megabyte Tandon TM503. It has 3 5.25" Platters, each with 2 read/write surfaces for a total of 6 recording surfaces.
Page 218 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ----------------- --- - ------------------------------------------------ Component Layout, Hard Disk Controller 8898798 Rev. A - 229 -...
Page 219 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ------------------------------------------------------------------ Circuit Trace, Hard Disk Controller 8898798 Rev. A, Component Side - 230 -...
Page 220 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Circuit Trace, Hard Disk Controller 8898798 Rev. A, Solder Side - 231 -...
Page 221 Service Manual TANDY 6000/6000-HD ----------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ------------------------------------------------------------------------ Parts List, Hard Disk Controller PCB, 8898798 Rev. A Ref No. Description Part No. Capacitors Capacitor, 100 pF, 50V, C. Disk 8301104 Capacitor, 100 pF, 50V, C. Disk, NPO 8301103 Capacitor, 100 pF, 50V, C.
Page 222 Service Manual TANDY 6000/6000-HD ---------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ------------------------------------------------------------------------ Parts List, Hard Disk Controller PCB, 8898798 Rev. A Ref No. Description Part No. Diodes Diode, 1N4148 8150148 Diode, 1N4148 8150148 Diode, 1N4148 8150148 Diode, 1N4148 8150148 8150148 Diode, 1N4148 Diode,...
Page 223 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS Parts List, Hard Disk Controller PCB, 8898798 Rev. A Ref No. Description Part No. Integrated Circuits 74F74, Dual Flip-Flop, 14-Pin 8015074 MC3487, Line Driver, 16-Pin 8050487 MC3486, Line Receiver, 16-Pin 8050486 74S04, Hex Inverter,...
Page 224 Service Manual TANDY 6000/6000-HD --------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Parts List, Hard Disk Controller PCB, 8898798 Rev. A Ref No. Description Part No. Staking Pins Staking Pin 8529014 Staking Pin 8529014 TP 3 Staking Pin 8529014 TP 4 Staking Pin...
Page 225 Service Manual TANDY 6000/6000-HD ---------------------------------------------------------------------- TANDY COMPUTER PRODUCTS --------------------------------------------------------------------- - 236 -...
Page 226 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS - 237 -...
Page 227 Service Manual TANDY 6000/6000-HD ----------------------------------------------------- — ------------ TANDY COMPUTER PRODUCTS — _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ - 239 -...
Page 228 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS - 241 -...
Page 229 Parts Lists/Exploded Views Contained in this section are the parts lists and exploded views for the various subassemblies of the Tandy 6000/6000-HD. Some parts are noted but may not be available as individual items. Consult the factory for replacement part availability.
Page 230: Base Assembly
Service Manual TANDY 6000/6000-HD ----------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ------------------------------------------------------------------------ 8.1 Base Assembly S/A 889CC11, Tandy 6000/6000-HD Computer Item Quan Description Part No Plug, Hole (Data Link) 8729125 Connector, Power Cord 8519207 Nut, KEPS Lock #4-40 8579003 Base, Computer 8719476 Feet, Bumpon...
Page 231: Exploded View, Base Assembly
Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS Figure 8-1. Exploded View, Base Assembly - 245 -...
Page 232: Card Cage, Chassis And Power Supply
Service Manual TANDY 6000/6000-HD --------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ------------------------------------------------------------------- 8.2 Card Cage, Main Chassis, and Power Supply Description Part No Item Quan Panel, Right Card Cage 8729249 Cover, Card Cage 8729211 8719482 Strips 3/8" x 1/4" x 7" 8719525 Retainer, Card Cage...
Page 233 Service Manual TANDY 6000/6000-HD ---------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Figure 8-2. Exploded View, Card Cage, Main Chassis and Power Supply - 247 -...
Page 234: 8.3 Floppy Disk Drive
Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS 8.3 Floppy Disk Drive Item Quan Description Part No. Mount, Disk Drive 8729261 Disk Drive Assembly 8790123 Bar, Rear Mounting 8729262 Bar, Front Mounting 8729263 Lens, LED 8719294 Bezel, Drive 9719295 - 248 -...
Page 235: Exploded View, Floppy Disk Drive
TANDY 6000/6000-HD Service Manual TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Figure 8-3. Exploded View, Floppy Disk Drive Assembly - 249 -...
Page 236: 8.4 Hard Disk Drive Assembly
Service Manual TANDY 6000/6000-HD --------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ------------------------------------------------------------------- 8.4 Hard Disk Drive Assembly Description Part No Item Quan Cable Assembly, 34-Pin Connector 8709490 8709489 Cable Assembly, 20-Pin connector Drive, Hard Disk 8790205 Mount, Disk Drive 8729261 8589097 Spacer, Plastic...
Page 237: Exploded View, Hard Disk Drive Assembly
Service Manual TANDY 6000/6000-HD ---------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Figure 8-4. Exploded View, Hard Disk Drive Assembly - 251 -...
Page 238: 8.5 Bezel Assembly
Service Manual TANDY 6000/6000-HD — ------ TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- 8.5 Bezel Assembly Item Quan Description Part No Stiffener, Bezel 8729515 Bezel, Front 8729261 Video PCB 8898018 8729517 Video Mount CRT Assembly (TCE) 8790614 Contrast Control 8261150 Brightness Control 8262450...
Page 239: Exploded View, Bezel Assembly
Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _...
Page 240: 8.6 Reset/Power On Indicator Module
Service Manual TANDY 6000/6000-HD ------------------------------------------------------------------------ TANDY COMPUTER PRODUCTS ---------------------------------------------------------------- ------- 8.6 Reset/Power On Indicator Module Item Item Quan Quan Description Description Part No. Part No. Indicator, Power On 8469011 Switch, Reset 8489055 Cable, Reset Switch 8709395 - 254 -...
Page 241: Exploded View, Reset/Power On
Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS Figure 8-6. Exploded View, Reset/Power On Indicator Module - 255 -...
Page 242: Case Top
Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS 8.7 Case Top Assembly Item Quan Description Part No. Case, Top 8719469 Spring, Bar 8729158 Do o r , Rear 8719248 8729194 Bracket, Strain Relief - 256 -...
Page 243: Exploded View, Case Top Assembly
Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS --------------------------------------------------------------------- Figure 8-7. Exploded View, Case Top Assembly...
Page 244: 8.8 Keyboard Assembly
Service Manual TANDY 6000/6000-HD ------------------------------------------------------------ TANDY COMPUTER PRODUCTS -------------------------------------------------------------------- 8.8 Keyboard Assembly Item Quan Description Part No. Nameplate, Keyboard 8729261 Cover, Keyboard 8719479 Bezel, Keyboard 8719467 Keyboard, Low Profile 8790554 Cable, Keyboard 8709396 Base, Keyboard 8719299 Bushing 8719156 Feet, Cork...
Page 245: Exploded View, Keyboard Assembly
Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS --------------------------------------------------------------------- Figure 8-8. Exploded View, Keyboard Assembly...
Page 246 Service Manual TANDY 6000/6000-HD ---------------------------------------------------------------------- TANDY COMPUTER PRODUCTS -------------------------------------------------------------------- - 260 -...
Page 247: Appendices
Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ----------------------------------------------------------------------- Appendices Appendix A Video Monitor Assembly Appendix B Floppy Disk Assembly Appendix C Hard Disk Assembly - 261 -...
Page 248 Service Manual TANDY 6000/6000-HD ---------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ------------------------------------------------------------------- - 262 -...
Page 249 Service Manual TANDY 6000/6000-HD --------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Video Monitor Assembly 8790614 (TCE) Ref. No. Description Part No. Capacitors C101 Capacitor, 4.7 uF, 50V, 20% CE04(RB)475M C102 Capacitor, 180 pF, 50V, 10% CK45B1H181K C103 Capacitor, 0.1 uF, 50V, 10%...
Page 250 Service Manual TANDY 6000/6000-HD ---------------------------------------------------------------------- TANDY COMPUTER PRODUCTS -------------------------------------------------------------------- Video Monitor Assembly 8790614 (TCE) Part No. Ref. No. Description CE04C227M C401 Capacitor, 220 uF, 16V, 20% Capacitor, 1000 pF,1000V,+100-0% CK45E3A102P C501 Coils 143410020A L301 Coil, Linearity 143310140A L302 Coil, Width...
Page 251 Service Manual TANDY 6000/6000-HD --------------------------------------------------------------------- TANDY COMPUTER PRODUCTS ---------------------------------------------------------------------- Video Monitor Assembly 8790614 (TCE) Ref. No. Description, Part No. R205 Resistor, 6.8 ohms, 1/4W, 5% RD1/4MZ(S )6R8J R206 Resistor, 1.2 ohms, 1/2W, 5% R207 Resistor, 4.7k ohms, 1/4W, 5% RDl/4MZ(S)472J...
Page 252 Service Manual TANDY 6000/6000-HD TANDY COMPUTER PRODUCTS ------------------------------------------------------------------ Video Monitor Assembly 8790608 (TCE) Ref. No. Description, Part No. Variable Resistors VR201 Variable Resistor, 100k ohms 176910730A VR202 176910710A Variable Resistor, 20k ohms 176910730A VR20 3 Variable Resistor, 100k ohms 176910670A...
Page 255 OPERATING AND SERVICE MANUAL TM848-1E AND TM848-2E THINLINE™ FLEXIBLE DISK DRIVES 48 TRACKS PER INCH T andon c o r p o r a t i o n 20320 PRAIRIE STREET CHATSWORTH, CALIFORNIA 91311 ® COPYRIGHT 1983 TANDON CORPORATION...
Page 256 N O T IC E T h is d o c u m e n t, a n d th e in fo r m a tio n c o n ta in e d h e re in , is c o p y r ig h t b y T a n d o n C o rp o ra tio n a n d m a y n o t be d u p lic a te d o r re p ro d u c e d , in w h o le o r in p a r t, w it h o u t th e p r io r w r it t e n a p p ro v a l o f T a n d o n C o rp o ra tio n .
Page 257 C O N T E N T S Section Page Number Title Number S E C T IO N 1 G E N E R A L D E S C R IP T IO N I n t r o d u c t io n ..........................Scope o f th e D o c u m e n t......................
Page 258 Section Page Number Title Number S E C T IO N 1 G E N E R A L D E S C R IP T IO N D is k e t t e s ............................3-13 L o a d in g th e D i s k e t t e ......................3-13 W r it e P r o te c t T a b .............
Page 259 Section Page Number Title Number S E C T IO N 6 T R O U B L E S H O O T IN G G U ID E A N D R E P L A C E M E N T P R O C E D U R E S I n t r o d u c t io n ..........................
Page 260 ILLUSTRATIONS F IG U R E S Figure Page Num ber T itle Number D is k D r iv e ..........................D is k D r iv e O u tlin e D r a w in g ....................+ 24 V o lt D .
Page 261 TABLES , Table Page Number Title Number E le c tr ic a l a n d O p e ra tio n a l S p e c ific a tio n s ............... R e lia b ilit y S p e c if ic a t io n s ...................... E n v ir o n m e n ta l S p e c if ic a tio n s ....................
Page 263: General Description
SECTION 1 GENERAL DESCRIPTION INTRODUCTION PURPOSE OF THE DRIVE T h e T M 8 4 8 -1 E a n d T M 8 4 8 -2 E d riv e s a re r o t a t in g d is k m e m o rie s d e s ig n e d fo r ra n d o m access d a ta e n tr y ,...
Page 264: Daisy Chain Capability
DISKETTE LEVER LOCK SOLENOID DAISY CHAIN CAPABILITY (OPTIONAL) T h e d r iv e p ro v id e s th e ad d re ss s e le c tio n a n d T h e d is k e tte le v e r lo c k s o le n o id is c o n tr o lle d g a tin g fu n c tio n s n e c e ssa ry to d a is y c h a in a b y th e h o s t s y s te m .
Page 265: Self-Tests
D a ta re c o v e ry e le c tro n ic s in c lu d e a lo w -le v e l A t h ir d te s t m o n ito r s th e in d e x sensors w h e n e v e r th e d is k e tte le v e r is closed.
Page 266 FIGURE 1-1 DISK DRIVE...
Page 267: Product Specifications
SECTION 2 PRODUCT SPECIFICATIONS INTRODUCTION T h is s e c tio n c o n ta in s th e m e c h a n ic a l, e le c tr ic a l, r e lia b ilit y , a n d e n v ir o n m e n ta l s p e c ific a tio n s fo r th e T M 8 4 8 -1 E a n d T M 8 4 8 -2 E d riv e s .
Page 269 TABLE 2-1 ELECTRICAL AND OPERATIONAL SPECIFICATIONS M e d ia 203.20 m illim e t e r , 8 -in c h , IB M in d u s tr y - s ta n d a rd d is k e tte M e d ia L if e (fo r re fe re n c e o n ly ) 3 x 106 passes p e r tr a c k T ra c k s P e r In c h...
Page 270 T A B L E 2 -1 (C O N T IN U E D ) E L E C T R IC A L A N D O P E R A T IO N A L S P E C IF IC A T IO N S F lu x R e v e rs a ls P e r In c h (F R P I), in s id e tr a c k B o th D riv e s , S ide 0...
Page 271 FIGURE 2 -3 + 2 4 VOLT D.C. CURRENT, CONFIGURATION 2 179056-001 l a n d o n CO RPO RATIO N, C H A T S W O R T H , CALIFORNIA 9 1 3 1 1 REV. A...
Page 272 TABLE 2 -2 RELIABILITY SPECIFICATIONS E r r o r R a te s , m a x im u m , e x c lu s iv e o f e x te r n a l sources, e.g.: e le c tro n ic s , d e fe c tiv e a n d c o n ta m in a te d d is k e tte s S o ft E r r o r s (R e c o v e ra b le )
Page 273: Operation
SECTION 3 OPERATION INTRODUCTION R e m o ve th e c a rd b o a rd s h ip p in g in s e r t, a n d r e t a in f o r f u t u r e s h ip m e n t. E n s u re t h a t th e f r o n t p a n e l is secure.
Page 274: Dust Cover
DUST COVER A l l in te r fa c e s ig n a ls a re T T L c o m p a tib le . L o g ic tr u e (lo w ) is + 0 .4 v o lt m a x im u m . L o g ic fa ls e (h ig h ) is + 2 .4 v o lts m in im u m .
Page 275: Drive Interface Lines And Pin Assignments
TABLE 3-1 DRIVE INTERFACE LINES AND PIN ASSIGNMENTS Ground Signal W r ite C u r r e n t S w itc h M o to r O n C o n tro l 1 M o to r O n C o n tro l 2 T ru e R e a d y (M o to r O n C o n tro l 3, O p tio n a l) T w o S ided (S tra p p a b le ) (T M 8 4 8 -2 E o n ly ) D is k C h a n g e (S tra p p a b le )
Page 276 N O T E p a tte r n s a n d a d ju s t th e W r ite D a ta w a v e fo rm . A lth o u g h a v a lu e c a n n o t be s p e c ifie d f o r T M 8 4 8 - I E a n d T M 8 4 8 - 2 E...
Page 277: Output Control Lines
WRITE PROTECT selects th e R e a d /W r ite h e a d o n sid e zero, th e lo w e r h e a d o f th e d riv e . A tr u e (lo w ) le v e l o n th is lin e s e le c ts th e R e a d /W rite h e a d o n side T h e W r it e P ro te c t s ig n a l is p ro v id e d to i n d i...
Page 278: Typical Interface Characteristics
DISK CHANGE F ig u r e 3-1 c o n ta in s th e e le c tr ic a l in te r fa c e c h a ra c te ris tic s . F ig u r e 3-2 c o n ta in s th e c o n tr o l a n d d a ta t im in g re q u ire m e n ts .
Page 279 FIGURE 3 -2 CONTROL AND DATA TIMING REQUIREMENTS...
Page 280: Drive Address And Option Strapping
DS1 DS2 DS3 DS4 DRIVE SELECT DRIVE ADDRESS AND OPTION STRAPPING — — — S e le cts D r iv e 0 v ia J l- 2 6 . T h e d r iv e a d d re ss a n d o p tio n s tr a p p in g is —...
Page 281: Option Patching
TABLE 3 -3 OPTION PATCHING As Shipped N ot Trace Designator Installed Installed O ption D S l D S 2 - D S 4 D S 1 - D S 4 D r iv e S e le c t S I —...
Page 282: Stepper Motor Power (Ps, Ps*, Ds, Hl)
STEPPER MOTOR POWER t u r n o f f d e la y o f th e s p in d le m o to r is a c tiv a te d (PS, PS*, DS, HL) on th e t r a i l i n g edge o f th e M o to r C o n tro l s ig n a l.
Page 283 FIGURE 3-3 LSI CIRCUIT BOARD ASSEMBLY 3-11...
Page 284: Ready And True Ready (R And Tr)
READY AND TRUE READY (R AND TR) DISK CHANGE (DC) T h is o u tp u t is used to in d ic a te to th e co n W h e n th e R ju m p e r is in s ta lle d , th e R e a d y t r o lle r t h a t a d is k c h a n g e has been m a d e .
Page 285: Write Current Switch (Xc And Ic)
WRITE CURRENT SWITCH (XC AND IC) R e in s ta ll th e ju m p e r s in t h e ir o r ig in a l c o n fig u r a tio n . P o w e r on th e d riv e .
Page 286 T A BL E 3 - 4 DIAGNOSTIC MODE OF OPERATION T est D e s c rip tio n o f T est — — — — Seek to T ra c k 0, an d tu rn on sp in d le m o to r. T h is te s t seeks th e c a rria g e to T r a c k 0, a n d tu r n s on th e s p in d le m o to r.
Page 287 TABLE 3 -4 (CONTINUED) DIAGNOSTIC MODE OF OPERATION T e st D e s c rip tio n o f T e st 1 0 /A M o n ito r th e w rite p ro te c t sensor. T h is te s t ch e ck s th e w r it e p ro te c t sensor.
Page 288: Diskette Handling And Storage
W h e n th e s lo t is c o v e re d w i t h a n o p tic a lly a n d to e n h a n c e th e s e rv ic e l i f e o f th e d is k e tte , op a qu e , s e lf-a d h e s iv e ta b , th e d is k e tte is w r it e th e fo llo w in g h a n d lin g p ro c e d u re s h o u ld be e n a b le d .
Page 289 FIGURE 3-5 DISKETTE CARE AND HANDLING 3-17...
Page 291: Theory Of Operation
SECTION 4 THEORY OF OPERATION R e c o rd in g o f d a ta on a m a g n e tic m e d iu m is INTRODUCTION based on th e p r in c ip le s o f e le c tro m a g n e tic s . W h e n c u r r e n t flo w s i n a c o il o f w ir e i t p r o ...
Page 292 FIGURE 4-2 FM RECORDING MAGNETIZATION PROFILES A s th e d is k s p in s , th e m a g n e tic fie ld s o f th e A . C. v o lta g e s ig n a l w h ic h is th e n a m p lifie d s to re d d a ta pass s u c c e s s iv e ly u n d e r th e head.
Page 293: Components Of The Drive
L .E .D . is a llo w e d to t u r n on th e in d e x d e te c to r, COMPONENTS OF THE p ro d u c in g a p o s itiv e p u ls e on T e s t P o in t 1, fo r DRIVE in d e x n u m b e r tw o sensor, a n d T e s t P o in t 2 fo r in d e x n u m b e r one sensor.
Page 294 FIGURE 4-4 INTERCONNECT BLOCK DIAGRAM...
Page 295 FIGURE 4 -6 TRACK O TIMING...
Page 296: Lever Lock Solenoid
STEP AND DIRECTION A lo w , a c tiv e s ig n a l is s u p p lie d to th e L S I c h ip , w h ic h s u p p lie s a n a c tiv e s ig n a l to th e m ic r o pro ce ssor a n d e n a b le s th e in p u t a n d o u tp u t T h e S te p a n d D ir e c tio n s ig n a ls a re d e riv e d s ig n a ls in t e r n a lly .
Page 297: Read/Write Data
FIGURE 4-7 STEPPER MOTOR CURRENT READ/WRITE DATA 14. I f th e s ig n a l is h ig h a t th e in te rfa c e , S ide 0 is se le cte d b y a p p ly in g a v o lta g e p o te n tia l on th e c e n te r ta p o f H e a d 0, a n d a llo w s c u r r e n t to flo w in th e c o ils o f H e a d 0.
Page 298 T h e w in d in g o n th e h e a d is c e n te r ta p p e d . T h e w r it e d a ta in p u t is used to c lo c k D u r in g a w r it e o p e ra tio n , c u r r e n t fr o m th e th e w a v e fo rm g e n e ra to r w h ic h sele cts w r it e...
Page 299: Read Data Circuits
T h e R e a d o n ly c ir c u it s a re used to is o la te th e READ DATA CIRCUITS re a d a m p lif ie r fr o m th e v o lta g e e x c u rs io n across th e h e a d d u r in g a w r it e o p e ra tio n .
Page 300: Spindle Control
SPINDLE CONTROL s ig n a l is s u p p lie d to th e L S I c h ip , w h ic h uses i t to e n a b le th e m o to r c u r r e n t c ir c u it o f th e s p in d le m o to r c o n tro l.
Page 301: Maintenance Checks And Adjustments
SECTION 5 MAINTENANCE CHECKS AND ADJUSTMENTS INTRODUCTION E n s u re th e f r o n t p a n e l is secure. M a n u a lly r o ta te th e d r iv e m o to r. I t s h o u ld r o ta te fr e e ly .
Page 302: Power/Drive Select Check
FIGURE 5-1 LOGIC CIRCUIT BOARD WITH TEST POINTS POWER/DRIVE SELECT A s s o c ia te d p o w e r a n d in te r fa c e cab le s. CHECK A n u m b e r 1 P h illip s s c re w d riv e r. T h e d riv e s e le ct c h e c k v e r ifie s th e a c t i v i t y 9* A n u m b e r 2 P h illip s s c re w d riv e r.
Page 303: Write Protect Sensor Check
V e r if y th e p o w e r s u p p ly v o lta g e s a re A p p ly p o w e r to th e d riv e . w i t h i n to le ra n c e s .
Page 304 FIGURE 5-2 TIMING DISK FIGURE 5-3 HUB CENTER LINE AND TRACK LOCATION <...
Page 305 R ea d T r a c k 38 f o r R a d ia l T r a c k a lig n N O T E m e n t o f th e lo w e r hea d. T h e T r a c k 38 r a d iu s is 2.8 2 0 7 ±...
Page 306: Radial Track Alignment Adjustment
S te p th e d r iv e to T r a c k 0, th e n ste p i t I f a ll th e c h e ck s v e r if y , th e R a d ia l b a c k to T r a c k 38.
Page 307: In D E X C Hecks A N D A D Ju S T M E N T S
INDEX CHECKS AND T im e B a s e : m ic ro s e c o n d s p e r d iv is io n ADJUSTMENT E x te r n a l T r ig g e r : T e s t P o in t 10, p o s itiv e edge T h e in d e x...
Page 308: Index Sensor Adjustment
N O T E A d ju s t th e in d e x sensor w i t h a f l a t b la d e s c r e w d riv e r u n t i l th e in d e x - H e a d 1 s h o u ld m e e t th e sam e...
Page 309: Track 0 Sensor Check And Adjustment
S e t u p th e oscillo sco p e to re a d : C h a n n e l A : U 2 , P in 14 C h a n n e l B : U 2 , P in 15 G ro u n d : T e s t P o in t 8 R e a d D i f f e r e n t ia ll y :...
Page 310: Track 0 Sensor Adjustment
TRACK 0 SENSOR CHECK 12. V e r if y th e lo g ic le v e l a t T e s t P o in t 3 is a t le a s t 2.5 v o lts . S et u p th e oscilloscope t o re a d : I f a ll o f th e se ch ecks a re s a tis fa c to r y , n o a d ju s tm e n t is re q u ire d .
Page 311 FIGURE 5-11 TRACK 0 RETAINING SCREW H e a d a m p litu d e can be v e r ifie d b y e s ta b lis h G ro u n d : T e s t P o in t 8 in g a n o m in a l v a lu e o f a m p litu d e f o r th e d is k ...
Page 312: 5.11 Cone Centering Check
5.11 CONE CENTERING CHECK 2. A p p ly p o w e r to th e d riv e . S e le c t th e d r iv e . Cone c e n te r in g is th e a b ili t y o f th e cone c la m p in g m e c h a n is m to c e n te r th e d is k e tte on th e Seek to T r a c k 0.
Page 313: Troubleshooting Guide And Replacement Procedures
SECTION 6 TROUBLESHOOTING GUIDE AND REPLACEMENT PROCEDURES V e r if y th e re is no r a d ia te d n o ise to th e INTRODUCTION d riv e . E n s u re te m p e r a tu r e in th e v ic i n i t y o f T h is s e c tio n is d e sig n e d to h e lp lo c a te a n d c o r...
Page 314 T A B L E 6 -1 T R O U B L E S H O O T IN G G U ID E C ondition Possible Cause Recommended A ction N o in d e x . D is k e tte n o t in s e rte d . In s e r t d is k e tte .
Page 315 T A B L E 6 -1 T R O U B L E S H O O T IN G G U ID E (CONTINUED) C ondition Possible Cause Recommended Action W i l l n o t w r it e . D is k e tte is w r it e p ro te c te d .
Page 316 TA B L E 6 -1 T R O U B L E S H O O T IN G G U ID E (CONTINUED) C ondition Possible Cause Recommended A ction F a ils d r iv e V e r if y p o w e r s u p p ly v o lta g e s . s e le c t c h e ck.
Page 317: Replacement Procedures
TA B L E 6 -1 T R O U B L E S H O O T IN G G U ID E (CONTINUED) Recommended Action C ondition Possible Cause F a ils In d e x c h e c k s a n d See: N o in d e x .
Page 318 TABLE 6 -2 CHECKS AND ADJUSTMENT GUIDE REC O M M EN D ED CHECKS A N D AD JUSTM ENTS PARTS OR ASSEM BLIES REPLACED L o g ic C ir c u it B o a rd Cone A s s e m b ly D is k e tte L e v e r A s s e m b ly F r o n t P a n e l B rid g e A s s e m b ly...
Page 319: Logic Circuit Board
REPLACEMENT LOGIC CIRCUIT BOARD REMOVAL P la c e th e n e w c ir c u it b o a rd on th e d riv e . R e m o ve a l l co n n e c to rs fr o m th e c ir c u it b o a rd ( F ig u r e 6 -1 ).
Page 320: Cone Assembly
CONE ASSEMBLY S w in g th e Cone A s s e m b ly u p 9 0 de grees so t h a t i t p o in ts to w a r d th e side REMOVAL o f th e d riv e .
Page 321 5. I n s e r t th e scre w t h a t a tta c h e s th e cone INSTALLATION b r a c k e t to th e cone a lig n m e n t a rm ( F ig u r e 6 -2 ).
Page 322: Diskette Lever
DISKETTE LEVER P u t a d ro p o f L o c k t ite N u m b e r 2 3 4 o n th e th re a d s o f th e d is k e tte le v e r ’s screw .
Page 323: Front Panel
INSTALLATION FRONT PANEL P u t th e f r o n t p a n e l on th e d riv e , e n s u r in g th e A c t i v i t y L .E .D . goes in to its REMOVAL h o ld e r.
Page 324: Bridge Assembly
BRIDGE ASSEMBLY N O T E E n s u re th e u p p e r h e a d l i f t a rm REMOVAL to p th e lo a d a r m a s s e m b ly . R e m o ve th e L o g ic c ir c u it b o a rd .
Page 325: D R Iv E M O To R
FIGURE 6-7 BRIDGE ASSEMBLY D R IV E M O TO R C u t th e tie w ra p s a tta c h in g th e d riv e m o to r c o n n e c to r to th e c a b le h a rn e s s ( F ig u re 6-8).
Page 326 FIGURE 6-8 DRIVE MOTOR MOUNTING SCREWS INSTALLATION B u n d le th e ca b le h a rn e s s w i t h tw o tie w ra p s . I n s t a ll th e n e w d r iv e m o to r a s se m b ly, a lig n in g th e m o u n tin g h o le on th e to p I n s t a ll th e b rid g e a sse m b ly.
Page 327: Load Arm Assembly
FIGURE 6-9 HEAT SINK AND CABLE SLOT LOAD ARM ASSEMBLY e n s u r in g th e lo a d a rm p in is s it t in g u n d e r th e f r o n t o f th e m o u n tin g screw s a n d w a s h e r.
Page 328: Track 0 Sensor Assembly
FIGURE 6-10 LOAD ARM ASSEMBLY TRACK 0 SENSOR ASSEMBLY INSTALLATION REMOVAL I n s t a ll th e T r a c k 0 S ensor A s s e m b ly . R e m o ve P l l fr o m th e L o g ic c ir c u it...
Page 329: Write Protect Sensor Assembly
FIGURE 6-11 TRACK 0 SENSOR ASSEMBLY WRITE PROTECT SENSOR ASSEMBLY INSTALLATION REMOVAL U s in g th e o r ig in a l m o u n tin g b ra c k e t, a tta c h th e W r ite P r o te c t S e nso r A s s e m R e m o ve P IO fr o m th e c ir c u it b o a rd .
Page 330: Motor Switch Assembly
FIGURE 6-12 WRITE PROTECT SENSOR ASSEMBLY MOTOR SWITCH ASSEMBLY INSTALLATION REMOVAL M o u n t th e M o to r S w itc h A s s e m b ly to t h e b r i d g e , u s i n g t h e o r i g i n a l...
Page 331: Index Sensor Assembly
FIGURE 6-13 MOTOR SWITCH ASSEMBLY INDEX SENSOR ASSEMBLY R em ove th e d r iv e m o to r. R e m o ve th e le f t g u id e r a i l b y p u s h in g REMOVAL in o n th e c e n te r ta b o f th e r a il, a n d R e m o ve th e L o g ic c ir c u it b o a rd .
Page 332 FIGURE 6-14 INDEX SENSOR ASSEMBLY, TOP VIEW INSTALLATION I n s t a ll th e d r iv e m o to r M o u n t th e lo w e r in d e x senso r to th e I n s t a ll th e B rid g e A s s e m b ly , a n d u p p e r chassis.
Page 333: Diskette Ejector Assembly
FIGURE 6-15 INDEX SENSOR ASSEMBLY, BOTTOM VIEW DISKETTE EJECTOR ASSEMBLY In s e r t th e e je c to r. P u ll th e s p rin g b a c k , a tta c h in g i t to REMOVAL th e r e a r o f th e e je c to r.
Page 334: Stepper Band
FIGURE 6-16 DISKETTE EJECTOR ASSEMBLY Loo p th e s te p p e r b a n d a ro u n d th e s te p STEPPER BAND p e r p u lle y . REMOVAL A tt a c h th e r e a r o f th e b a n d to th e s p r in g te n s io n e r.
Page 335: Stepper Motor Assembly
FIGURE 6-17 STEPPER BAND INSTALLATION STEPPER MOTOR ASSEMBLY REMOVAL 1. P la c e th e S te p p e r M o to r A s s e m b ly in to R e m o ve th e L o g ic c ir c u it b o a rd . th e d r iv e ’s chassis.
Page 336: Head Carriage Assembly
FIGURE 6-18 STEPPER MOTOR INSTALLATION HEAD CARRIAGE ASSEMBLY I n s t a ll th e c a rria g e g u id e r a ils in t o th e REMOVAL c a rria g e . U s in g th e tw o c lip s , a tta c h th e c a rria g e 1.
Page 337 FIGURE 6-19 HEAD CARRIAGE 6-25...
Page 339 APPENDIX A RECOMMENDED SPARE PARTS AND MAJOR ASSEMBLIES This appendix contains the recommended spare parts and the m ajor assembly drawings for the drive. P art numbers on this list should be used for ordering spare parts. A spare parts list with prices for parts and services is available from Tandon Corporation.
Page 343 APPENDIX B CIRCUIT BOARD SCHEMATICS AND DRAWINGS T h is a p p e n d ix c o n ta in s th e c u r r e n t c ir c u it b o a rd s c h e m a tic s a n d c ir c u it b o a rd d ra w in g s fo r th e T M 8 4 8 -1 E a n d T M 8 4 8 -2 E .
Page 349 Ta n d o n CORPORATE OFFICES 20320 PRAIRIE STREET CHATSWORTH, CA 91311 TELEPHONE NO.: (213) 993-6644 TELEX NO.: 194794 TWX NO.: 910-494-1721 P/N 179056-001A (T5014A 11-83) PRINTED IN U.S.A.
Page 351 OPERATING AND SERVICE MANUAL TM501, TM502, TM503 DISK DRIVES 345 TRACKS PER INCH Ta n d o n c o r p o r a t io n 20320 PRAIRIE STREET CHATSWORTH, CA 9 1 3 1 © C O P Y R IG H T 1983 T A N D O N C O R P O R A T IO N...
Page 352 N O T IC E T h is do cu m e nt, and the in fo rm a tio n containe d herein, is c o p y rig h t b y T a n d o n C o rp o ra tio n and m a y n o t be du p lica te d o r reproduced, in w hole o r in p a rt, w ith o u t the p r io r w ritte n a p proval o f T a n d o n C o rp o ra tio n .
Page 353 CONTENTS Section Page Number Title Number SECTION 1 GENERAL DESCRIPTION Introduction......................Scope Of The Document..................1-1 Purpose Of The Drive..................... 1-1 Maj or Features......................1-1 Microprocessor Control..................Daisy Chain Capability..................Industry Standard Interface Compatibility............Activity Indicator..............Air Filtration...................... Functional Description................... Physical Description....................
Page 354 Section Page Number Number T it le S E C T IO N 4 T R O U B L E S H O O T I N G G U I D E A N D R E P L A C E M E N T P R O C E D U R E I n t r o d u c t io n ..........
Page 355: Table Page
ILLUSTRATIONS F IG U R E S F ig u r e P age N u m b e r T it le N u m b e r D is k D r iv e ............................D is k D r iv e O u tlin e D r a w in g ......................2 -2 2 -2 T y p ic a l S ta r tin g C u r r e n ts ......................
Page 357: General Description
SECTION 1 GENERAL DESCRIPTION INTRODUCTION MAJOR FEATURES MICROPROCESSOR CONTROL T h is m anual provides useful in fo rm a tio n to assist the custom er w hen in c o rp o ra tin g the T a n d o n rig id d isk drive in to a system.
Page 358: Activity Indicator
ACTIVITY INDICATOR ind e x sensor, w h ich consists o f a m agnetic p ic k -u p and in d ex hole p o s itio n ed to p ro v id e an analog signal w hen an in dex hole is detected.
Page 359: Product Specifications
SECTION 2 PRODUCT SPECIFICATIONS INTRODUCTION This section contains the mechanical, electrical and operational, reliability, and environmental specifications for the TM501, TM502, and TM503 disk drives. MECHANICAL SPECIFICATIONS The mechanical and physical dimensions are contained in Figure 2-1. ELECTRICAL AND OPERATIONAL SPECIFICATIONS The electrical and operational specifications are contained in Table 2-1.
Page 360 N o te : W e ig h t is 3.0 kilo g ra m s, 6.5 pounds m a xim u m FIGURE 2-1 DISK DRIVE OUTLINE DRAWING 179045-001 T andon CORPORATION •CHATSWORTH, CALIFORNIA 91311 REV. A...
Page 361 TABLE 21 ELECTRICAL AND OPERATIONAL SPECIFICATIONS M e d ia L u b rica te d , 130 m illim e te r, plated a lu m in u m d isk Tracks Per In c h 345 T P I Spacing, T ra c k to T ra c k 2.9 m ilinches N u m b e r o f C ylinders...
Page 362 TABLE 2-1 (CONTINUED) ELECTRICAL AND OPERATIONAL SPECIFICATIONS 9090 F R P I M a x im u m F lu x Reversal D ensity U n fo rm a tte d C a p a city Per D riv e 6.38 megabytes TM 501 T M 5 0 2...
Page 363 FIGURE 2-2 TYPICAL STARTING CURRENTS 179045-001 T andon CORPORATION •CHATSWORTH, CALIFORNIA 91311 REV. A...
Page 364 TABLE 2*2 RELIABL1LITY SPECIFICATIONS SOFT AND HARD READ ERROR RATES, EXCLUSIVE OF MEDIA DEFECTS F o r data th a t has been v e rifie d previously as e rro r free, and when used in c o n ju n c tio n w ith a data separator and phase lo c k lo o p o f good design, the recoverable (s o ft) read e rro r rate fo r any subsequent read o p e ra tio n shall n o t exceed one e rro r in 1 X 10- bits tran sferred.
Page 365 TABLE 2-3 ENVIRONMENTAL SPECIFICATIONS A m b ie n t Tem perature 4°C to 50°C, 39°F to 122°F O p e ra ting N o n o p e ra tin g -40°C to 60°C, -40°F to 140°F T em perature G ra d ie n t O pera ting 10°C per h o u r, 18°F per h o u r N o n o p e ra tin g...
Page 367: Operation
SECTION 3 OPERATION INTRODUCTION sure to use p rio r steps in reverse o rd e r, and ensure the fo a m stiffeners in the p ro p e r lo c a tio n , w ith the card b o a rd dividers p ro p e rly in place between the T h is section contains in fo rm a tio n p e rtin e n t to the drives (see F igure 3-1).
Page 369: Dust Cover
DUST COVER data signals (see F igure 3-3). J3 provides fo r D .C . pow er (see Figure 3-4). The design o f an enclosure should in c o rp o ra te a Table 3-1 contains interface lines. The interface means to prevent c o n ta m in a tio n fro m loose item s, description o f the connectors, and the lo ca tio n o f e.g., dust, lin t, and paper chad since the d riv e does...
Page 370 FIGURE 3-2 J1 EDGE CONNECTOR DIMENSIONS FIGURE 3-3 J2 EDGE CONNECTOR DIMENSIONS FIGURE 3-4 J3 POWER CONNECTOR...
Page 371 TABLE 3-1 DRIVE INTERFACE SIGNALS AND PIN ASSIGNMENTS Interface P in N um b er Nam e o f Signal G round Signal Type I / O C onnecto r Signal Spare Head Select 22 W rite Gate Seek C om plete T ra ck 0 (H ) F a u lt...
Page 372: J3/P3 Connector
J3/P3 CONNECTOR The in terface m ay be connected in the ra d ia l o r daisy chain c o n fig u ra tio n (see Figures 3-5 and 3-6). D . C . p ow er co nn e cto r J3 is a fo u r-p in A M P M a te -N -L o k co n n e cto r, P / N 350211-1, m o unted o n the solder side o f the c irc u it b o a rd .
Page 373 FIGURE 3-5 RADIAL CONFIGURATION...
Page 374 FIGURE 3-6 DAISY CHAIN CONTROL LINES...
Page 375 FIGURE 3-7 CONTROL SIGNAL/DRIVER RECEIVER CIRCUIT COMBINATION WRITE GATE HEAD SELECT LINES 2°, 21 , 22 The active state o f this signal or logical zero level These three lines provide for the selection o f each enables write data to be written on the disk. The read/w rite head in a binary coded sequence.
Page 376 TABLE 3-2 HEAD SELECT LINES Head Select Lin e Head Selected Jum per Jum per 3 P W I3 O U T 3 PW 13 IN 2° T M 5 0 1 , T M 502 T M 503 Head recovery tim e (head-to-head select, w rite -to - logical false tra n sitio n o r the tra ilin g edge o f this read recovery, o r read-to-w rite recovery) is 2.4 signal pulse.
Page 377 FIGURE 3-8 STEP MODE TIMING BUFFERED SEEK The b u ffe re d seek uses an onboa rd m icroprocessor th a t calculates the m ost e ffic ie n t seek a lg o rith m fo r the user. T he user need o n ly issue step pulses in accordance w ith the tim in g shown (see Figure 3-9).
Page 378: Output Control Signals
DIRECTION IN SEEK COMPLETE This signal defines the d ire ctio n o f m o tio n o f the The Seek Com plete signal goes true when the re a d /w rite head w hen the Step line is pulsed. A n re a d /w rite heads have settled on the fin a l tra ck at open c irc u it o r lo g ica l false defines the d ire c tio n as the end o f a seek.
Page 379: Data Transfer Signals
READY lector drive (see F igure 3-7). T his signal goes active o n ly when the d rive is program m ed as D riv e X , X = 0, 1, 2, o r 3, b y p rog ram m ing the shunt on the W hen tru e , the Ready signal, together w ith Seek drive, and the D rive Select X line at J l / P l is ac...
Page 380: Drive Address And Option Selection
MFM WRITE DATA The o p tio n program m ing guide is conta ine d in T able 3-3. T h is is a d iffe re n tia l p a ir o f lines th a t d efin e the SHIPPING PACK AND flu x tra n s itio n to be w ritte n o n the tra c k .
Page 381 TABLE 3-3 OPTION PROGRAMMING GUIDE Factory W 1 -W3 Function Programmed Usage ju mper T ra c k F ault In sta ll fo r excess tra c k fa u lt. In sta ll fo r fa c to ry test. Test Disable L im it In sta ll to disable s o ft lim its .
Page 382 FIGURE 3-11 RECOMMENDED SHIPPING PACK DESIGN, CONFIGURATION 1...
Page 383 FIGURE 3-11 (CONTINUED) RECOMMENDED SHIPPING PACK DESIGN, CONFIGURATION 1 3-17...
Page 384 FIGURE 3-12 RECOMMENDED SHIPPING PACK DESIGN, CONFIGURATION 2 3-18...
Page 385 FIGURE 3-13 RECOMMENDED SHIPPING PACK DESIGN, CONFIGURATION 3 3-19...
Page 386 FIGURE 3-13 (CONTINUED) RECOMMENDED SHIPPING PACK DESIGN, CONFIGURATION 3 3-20...
Page 387 FIGURE 3-14 LOAD GRAPH 3-21...
Page 389: Troubleshooting Guide
SECTION 4 TROUBLESHOOTING GUIDE AND REPLACEMENT PROCEDURE INTRODUCTION O scilloscope, T e k tro n ix 465— ve rtica l and T h is section is designed to help locate and correct h o riz o n ta l se n sitivity plus three percent failures related to the drive.
Page 390 FIGURE 4-1 TEST POINT LOCATIONS...
Page 391 TABLE 4-2 TROUBLESHOOTING GUIDE P ro b le m Possible Cause Recom m ended A c tio n N o a c tiv ity la m p . N o t selected. C heck f o r co rre ct drive select ju m p e r.
Page 392 TABLE 4-2 (CONTINUED) TROUBLESHOOTING GUIDE P ro b le m Possible Cause Recom m ended A c tio n D riv e does n o t seek D riv e n o t selected. Check d rive select ju m p e r. o r restore.
Page 393 TABLE 4-2 (CONTINUED) TROUBLESHOOTING GUIDE Recom m ended A c tio n P ro b le m Possible Cause See “ D riv e does n o t seek o r re sto re .” Does n o t read. Im p ro p e r p o s itio n .
Page 394 FIGURE 4-3 READ DATA WAVEFORMS 15 TPR + AND 14 TPR...
Page 395: R E P La C E M E N T P Ro C E D U Re S
REPLACEMENT R E P L A C E M E N T P R O C E D U R E S replace th is assembly, reverse Steps th ro u g h 3. D o n o t ro ta te spindle m o to r o r head p o s itio n in g m echanism .
Page 396: Index Assembly
REPLACEMENT Loosen lo c k n u t In d e x A ssem bly bracket. replace assem bly, reverse Steps U nscrew the Index A ssem bly, and rem ove. th ro u g h 4. ADJUSTMENT REPLACEMENT T o a d ju s t th e L in e a r B rake Assem bly: T o replace the In d e x A ssem bly, reverse Steps 1 Loosen the 5 /1 6 -in c h m o u n tin g n u t.
Page 397 FIGURE 4-4 INDEX SENSOR...
Page 398 FRONT PANEL REPLACEMENT REMOVAL T o replace the b o a rd , reverse Steps 2 th ro u g h 4. W hen replacing connectors, ensure the p ro p e r p in o rie n ta tio n . T o rem ove the fr o n t panel: ADJUSTMENT W edge a ta p e r shim 0.030 in ch u nd er the...
Page 399: Frame Assembly
FIGURE 4-5 VOLTAGE SPIKES FRAME ASSEMBLY REMOVAL T o rem ove the T ra c k 0 Sensor Assem bly: REMOVAL Remove the C irc u it B o a rd Assem bly. Loosen the screw o n the T ra c k 0 Sensor T o rem ove the Fram e Assem bly: A ssem bly m o u n t.
Page 400 FIGURE 4-6 TRACK 0 ADJUSTMENT 4-12...
Page 401 APPENDIX A RECOMMENDED SPARE PARTS LIST AND MAJOR ASSEMBLIES A ll assemblies w ith p a rt num bers are available f o r purchase as spare replacem ent parts. T he item s w ith o u t alpha designators on the draw ings are f o r reference o n ly , and c a n n o t be purchased as spare replacem ent parts.
Page 402 RECOMMENDED SPARE PARTS LIST Part Number Description Brake Assembly..........962010-001 Index Assembly..........187010-001 Track 0 Assembly..........187174-001 187288-001 Frame Assembly..........Front Panel............187323-001 Spindle Control Board........187065-001 187345-002 Logic Board............Front Panel L.E.D . Assembly......187018-001 Single Pack Shipping Container......
Page 407 APPENDIX B CIRCUIT BOARD SCHEMATICS AND ASSEMBLY DRAWINGS T his a p p e n d ix contains the c u rre n t c irc u it b o a rd schematics and assembly draw in g s fo r the T M 5 0 0 series o f disk drives.
Page 416 RADIO SHACK, A DIVISION OF TANDY CORPORATION U.S.A.: FORT WORTH, TEXAS 76102 ___________CANADA: BARRIE, ONTARIO L4M 4W5__________ TANDY CORPORATION AUSTRALIA___________ ____________ BELGIUM_____________ L U C __________ _ 91 KURRAJONG AVENUE PARC INDUSTRIEL BILSTON ROAD WEONESBURY MOUNT DRUITT, N.S.W. 2770 5140 NANINNE (NAMUR) WEST MIDLANDS WS10 7JN Printed in U.S.A.

Tandy 6000 Service Manual

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