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Atari 400 Service Manual

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ATARI
400/800
Service Manual

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  • Page 1 ATARI 400/800 Service Manual...

  • Page 2: Table Of Contents

    2.5 Connecting the AC Power Adapter 2.6 Inserting Program Cartridge 2.7 Connecting Television Monitor 2.8 Connecting the ATARI 810 and 815 Disk Drive 2.9 Connecting the ATARI 820 and 822 Printer 2.10 Using the ATARI 850 Interface Module 2.10.1 Connecting the ATARI 850 Interface Module 2.10.2 Connecting the ATARI 825 Printer...
  • Page 3 4.2 The ATARI 400 and 800 Computer Console Systems 4.2.1 Motherboard 4.2.2 Central Processing Unit 4.2.3 ROM Personality Board 4.2.4 RAM Memory pcb 4.2.5 Keyboard 4.2.6 Power Supply 4.2.7 Program Cartridge 4.3 Functional Block Diagram Discussion 4.3.1 Central Processing Unit 4.3.2 Motherboard Console System {400)
  • Page 4 Figure 3-2. Special Graphics Using the CTRL Key Figure 3-3. Special Graphics Using the ESC Key Figure 3-4. SHIFT Keyboard and Key Combination Figure 4-1. Major Functional Modules of the ATARI 400/800 4-18 Figure 4-2. Block Diagram of the CPU Board 4-19 Figure 4-3.
  • Page 5 Figure 5-17. 400 Console, Bottom Cover Screw Location 5-31 Figure 5-18. 400 Console, Top Cover Removal 5-32 Figure 5-19. 400 Console, Keyboard Removal 5-32 Figure 5-20. 400 Console, Power Supply Removal 5-35 Figure 5-21. 400 Console, Module Assembly 5-36 Figure 5-22. 800 Console, Cartridge Door Assembly Removal 5-37 Figure 5-23.

  • Page 6: General Information

    CHAPTER 1 - GENERAL INFORMATION INTRODUCTION This 400/800 System Service Manual is a reference guide for the serv- ice technician. The information presented in this manual, when used in conjunction with ATARI training, will enable a service technician to install, operate, and maintain the ATARI 400/800 Computer Systems.

  • Page 7: How To Use This Manual

    Figure 1-1. The ATARI 400/800 Computer Consoles 1.3 HOW TO USE THIS MANUAL This manual is organized into six chapters: Chapter 1 General Information Chapter 2 Installation Chapter 3 System Operation Chapter 4 Functional Description Chapter 5 Maintenance Chapter 6 Spare Parts List and Ordering/Reporting Information Each chapter contains only the information needed to fulfill its function.

  • Page 8: Maintenance

    1.3.1 General Information This chapter contains a general description of the ATARI 400/800 Com- puter Consoles, a physical description of the system (dimensions, weights, and operating specifications), and a summary of the periph- eral equipment used with the system.

  • Page 9: Changes To This Manual

    Chapter 6 provides ATARI part numbers for the field replaceable units of the 400/800 Computer Console system. The chapter also provides information for ordering the parts through the nearest ATARI parts distribution center. In addition chapter 6 provides information on how to use the Fault Reporting System.

  • Page 10: Figure 1-2. Sample Notice Of Changes Page

    Figure 1-2. Sample Notice of Changes Page ATARI Personal Computers...

  • Page 11: Safety

    As with any electronic equipment, precautions consistent with all standard industrial safety practices must be observed while maintain- ing the ATARI 400/800 Computer Console systems. A current of 10 mA can put the human heart in fibrillation and a current of only 100 mA can cause it to stop completely.
  • Page 12 START - Interrupt used to Start the game or program selected from the Program Cartridge The AC Power Adapter provides the 9 Vac used by the 400 and 800 Com- puter Consoles. The AC Power Adapter plugs into a standard wall out- let and converts the 110V ac line voltage to the 9V ac required by the Consoles.

  • Page 13: Figure 1-3. Atari 400/800 Computer Console Systems

    Figure 1-3. ATARI 400/800 Computer Console Systems System Service Manual...

  • Page 14: Figure 1-4. Atari 400 Computer Console, Side View

    Cartridge Slot (one cartridge slot in the 400 Console, left cartridge slot in the 800 Console) the user can write programs in 'BASIC' programming lanquage. Programs written by the user are stored in the Console's RAM memory and are erased when power is turned off. The BASIC Program Cartridge is marked 'LEFT CARTRIDGE' indicating insertion in the left cartridge slot only.

  • Page 15: Optional Equipment

    Figure 1-5. ATARI 800 Computer Console, Side View provided as a standard feature with the 800 Computer Console. The Program Cartridge when inserted in the Computer Cartridge slot pro- vides a self-paced learning tool. The Program prompts the student with...

  • Page 16: Specifications

    Memory: 8K bytes of Random Access Memory (RAM) is included. The ATARI 400 may be expanded to 16K at your service center. lOK bytes ROM Operating System, expanded to with user installed solid-state Program Cartridges.

  • Page 17: Table 1-2. Atari 800 Computer Console Specifications

    Internal speaker (in addition ; ; to audio th rough televis ion se t). ; ; Memory : 8 or 16K bytes of Random Acces s Memory (RAM) is included. The ATARI 800 Console may be expanded to 48K with user-installed ATARI Memory Modules.

  • Page 18: Introduction

    2.2 UNPACKING The ATARI 400/800 Computer Systems are a series of components which function together with the user's television set to form a single computer system. The basic system consists of the following: •...

  • Page 19: Connecting The Tv Switch Box

    When the COMPUTER - TV switch on the TV Switch Box is in the COMPUTER position the television receives the RF signals from the ATARI Com- puter Console. Tune the television to channel 2 or 3, whichever is weaker in your area.

  • Page 20: Connecting The Program Cassette Recorder

    The ATARI 410 Program Cassette Recorder resembles an ordinary audio cassette recorder. Its playback and recording levels have been perma- nently set at the correct volume for use with the ATARI Computer Consoles. Carefully unpack the Program Cassette Recorder from its container, careful to save all packing material for storage and shipment.

  • Page 21: Connecting The Ac Power Adapter

    ROM within the cartridge. To insert a Program Cartridge open the Cartridge Door by depressing the lever marked PULL OPEN on either the 400 or 800 Consoles, see Figure 2-3. The door is held under tension and should spring open. Hold the cartridge with the label toward you so that it can be read.

  • Page 22: Figure 2-2. Atari 400/800 Computer Consoles, Side View

    Figure 2-2. ATARI 400/800 Computer Consoles, Side View ATARI Personal Computers...

  • Page 23: Figure 2-3. 400/800 Consoles, Cartridge Door Open

    Figure 2-3. 400/800 Consoles, Cartridge Door Open System Service Manual...

  • Page 24: Connecting The Atari 810 And 815 Disk Drive

    2.8 CONNECTING THE ATARI 810 AND 815 DISK DRIVE The ATARI 810 and 815 Disk Drives may be used with many combinations of ATARI devices. However, the ATARI 800 Computer Console with 16K (minimum) of RAM memory is required to operate the disk system. Up to four disk drives may be connected to the system at a time.

  • Page 25: Using The Atari 850 Interface Module

    The ATARI 850 Interface Module expands the interface capabilities of the ATARI Personal Computer Systems. The interface module connects to the ATARI 400 and 800 Computer Consoles via an I/O CONNECTOR port (two provided) and has four EIA RS232C compatible ports, an 8-bit parallel output interface for connection to the ATARI 825 80 Column Printer.

  • Page 26: Connecting The Atari 825 Printer

    (Power switch ON) to the interface module. 2.10.2 Connecting the ATARI 825 Printer The ATARI 825 Printer is an 80 column dot matrix printer that must be connected to the ATARI 850 Interface Module. The printer connects to the 8 bit parallel output interface port on the interface module using the CX86 Printer Cable.

  • Page 27: Connecting The Atari 830 Acoustic Modem

    2.10.3 Connecting the ATARI 830 Acoustic Modem The ATARI 830 Acoustic Modem is a stand-alone acoustically coupled, frequency shift keying (FSK) modem. It must be connected to the ATARI 400/800 Computer Consoles with the ATARI 850 Interface Module. Connect the acoustic modem as follows: •...

  • Page 28: Chapter 3 - System Operation

    ATARI 410 Program Cassette Recorder. 3.2 SYSTEM POWER-UP Two modes of system power-up exist for the ATARI 400/800 Personal Computer Systems; power-up with disk drives and power-up without disk drives. Before continuing with system power-up ensure that you have...

  • Page 29: System Power-Up With Disk Drive

    The ATARI Personal Computer Keyboard, see Figure 3-1, closely resem- bles an ordinary typewriter, but has been designed with additional flexibility to provide the ATARI user with the most efficient set of symbols for each Computer Console application. In addition, each key...

  • Page 30: Figure 3-1. The Atari Keyboard

    Figure 3-4 shows the characters that will be produced by the SHIFT and key combination • ATARI LOGO - The ATARI Logo key switches characters into inverse video. Press it again to go back to normal display. •...

  • Page 31: Figure 3-2. Special Graphics Using The Ctrl Key

    Figure 3-2. Special Graphics Using the CTRL Key • RETURN - The RETURN key has three functions. First, if moves the cursor to the left margin and down one line on the screen. Second, RETURN marks the end of a logical line for the computer. Third, RETURN activates the computer.

  • Page 32: Figure 3-3. Special Graphics Using The Esc Key

    Figure 3-3. Special Graphics Using the ESC Key ATARI Personal Computers...

  • Page 33: Figure 3-4. Shift Keyboard And Key Combination

    Figure 3-4. SHIFT Keyboard and Key Combination Screen Editinq Functions • SHIFT CLEAR or CTRL CLEAR - When held down simultaneously erases all characters on the screen and moves the cursor to the home position at the upper left corner of the screen. •...

  • Page 34: Program Cartridge System Keys

    The ATARI 410 Program Cassette Recorder resembles an ordinary audio cassette tape recorder. Its playback and recording levels have been permanently set at the correct volume for use with the ATARI Personal Computers. Set up the 410 Program Cassette Recorder according to the instructions contained in Chapter 2, System Installation.

  • Page 35: Transfer A Program To Cassette Tape

    • Press STOP EJECT to open the cassette door and disengage the cassette. • Insert a cassette into the aperture, with the tape surface toward you and close door. • Press REWIND to move to the beginning of the tape (the tape will stop automatically tape,...

  • Page 36: Transfer A Program From Tape To Computer

    A series of tones from the computer indicates that the program is being transferred. 8. When the tape stops, the program has been transferred from the cassette tape to the computer. 9. Press STOP EJECT on the Program Recorder. ATARI Personal Computers...

  • Page 37: Chapter 4. Functional Description

    For greatest convenience, all the Figures referred to in this Chapter have been placed together at the end of the Chapter. 4.2 The ATARI 400 and 800 Computer Console Systems The ATARI 400 and 800 Computer Consoles are made up of seven major functional modules. Refer to Figure 4.1. •...

  • Page 38: Central Processing Unit

    • Generates 3.58 MHz Master Clock for the CPU printed circuit board. • Generates Power-On Reset for the CPU printed circuit board. • Performs parallel/serial data conversion between printed circuit board and the peripherals. • Provides driving circuitry for the Key-Press signal from the CPU printed circuit board to the Console Speaker.

  • Page 39: Ram Memory Pcb

    Each RAM chip on the RAM pcb has only seven address lines. To address 16K separate locations requires fourteen address lines. To accomplish this, a fourteen-bit address is sent to the address demultiplexer, which first passes the lower seven bits to the RAM chips as a Row Address. ATARI Personal Computer...

  • Page 40: Keyboard

    Program Cartridge slot(s). The data in the memory locations is then placed on the Data bus lines. 4.3 FUNCTIONAL BLOCK DIAGRAM DISCUSSION The following paragraphs provide a detailed functional block diagram discussion of the 400 and 800 Console Systems. System Service Manual...

  • Page 41: Central Processing Unit

    Bus output buffer is a push-pull driver, like the Address Bus driver, and is capable of driving a TTL load. The data on this bus from an external support chip must be stable before the end of the Phase 2 clock pulse. ATARI Personal Computers...
  • Page 42 R/W Read/Write. The R/W Line allows the microprocessor to control the direction of data transfer among system components. When the voltage level is high the R/W line is reading from the Data Bus into the microprocessor. When the voltage level is low it is commanding an external device to write the present contents of the Data Bus into a peripheral support chip or memory.

  • Page 43: Motherboard Console System {400)

    Priority is assigned to all objects by the CTIA chip before the serial graphics data is sent to the video display. 4.3.2 Motherboard Console System (400) The 400 Console Motherboard contains the POKEY chip (A101), the PIA chip (A102),...
  • Page 44 POKEY integrated circuit provides interface between Keyboard, Serial I/O ports, and the microprocessor. Also contained within the chip are four semi-independent audio channels, each with its own f requency, noise, and volume control. Figure 4-6 shows pin assignments of the POKEY chip, and the functions of the pins are given below.

  • Page 45: Peripheral Interface Adapter (Pia)

    CS0, CS1, CS2 - Chip Selects. These inputs are used to select the PIA chip. CS0 and CS1 must be high and CS2 low in order to select the PIA chip. ATARI Personal Computers Table 4-1. PIA Register Selection and Function...
  • Page 46 CRA2 CRB2 Function Read Write Data Direction Register A Write into Peripheral interface Register A Read from A-side input pins PA0 - Read or Write Control Register A Write into Peripheral Interface Register B Read Write Data Direction Register B Read from B-side input pins PB0- Read or Write Control Register B IRQA...
  • Page 47 When the microprocessor has finished reading the available data it signals the peripheral device by setting the CS2 line low. ATARI Personal Computers 4-11 4.3.2.3 Key-IN Key-OUT Integrated Circuits. These two 4051 (Z101 and Z102) integrated circuits are used to scan the Keyboard for input...

  • Page 48: Table 4-2 Memory Map Select Lines

    XO - X7. The eight possible inputs on each 4051 chip allows a maximum of 64 keys to be scanned (the 400 and 800 keyboards both contain 57 keys). When a key is scanned and found depressed, the output line X (pin 3) goes low to signal the POKEY chip to stop the count.

  • Page 49: Motherboard Console System

    Y1 - 14 Not Used Y2 - 13 POKEY Y3 - 12 Y4 - 11 Not Used Y5 - 10 External Select Y6 - 9 Not Used Y7 - 8 Not Used ATARI Personal Computers 4-13 4.3.3 Motherboard Console System (800)

  • Page 50: Bidirectional Data Buffer

    (Z1010) one-of-eight decoder/demultiplexer. Refer to the description provided in Section 4.3.2. The I/O Decoder is the same in the 400 and 800, but is labeled Z101 in the 800 console and Z105 in the 400 Console. 4.3.3.3 Composite Video The 400 and 800 Motherboards route the Composite video signals (COMP CHROMA, COMP LUM, MOD, and COMP VIDEO) to the Power Supply to build the RF video output.
  • Page 51 Operating System performs the following actions after the Reset key is pressed: • Clears the Operating System portion of RAM memory • Re-establishes all RAM interrupt vectors • Formats the Handler Address table • Initializes the ROM Cartridges ATARI Personal Computers 4-15...

  • Page 52: Ram Memory Boards

    Floating point number clear, load, store and move 4.3.5 RAM Memory Boards The ATARI 400 and 800 Computers come equipped with either 8K or 16K RAM memory boards. The 8K and 16K RAM memory boards are the same except for the 8K or 16K ememory chips and the addition of connector jumpers on the 8K RAM memory boards.
  • Page 53 The RF signal is generated in both the 400 and 800 Power Supplies from the MOD signal received from the Motherboard. It is routed through the A203 integrated circuit to develop the RF output (J203). A peripheral connector jack, J202 for the 400 Console and J204 for the 800 Console, provides the serial data-in/data-out port for the system.
  • Page 78 (wrapped in packaging material) and cleaning lubricating the printed circuit board (PCB) contacts. Many of the troubles encountered with both the 400 and 800 Consoles consist of loose or corroded contacts on both the CPU and memory (ROM and RAM) printed circuit boards.
  • Page 79 5.2.1 PCB Contact Cleaning and Lubrication The following steps detail procedures required to clean lubricate the PCB contacts on the CPU and memory PCBs once they have been removed from the motherboard. Refer to paragraphs 5.5 and 5.6 for disassembly instructions and paragraphs 5.7 and 5.8 for assembly instructions.
  • Page 80 400/800 Computer Consoles. Refer to Figure 5-1, System Check-Out Flowchart. which depicts the typical paths followed by a service person. Figure 5-1 can be used as a guide in interpreting maintenance on the 400/800 C omputer Consoles. 5.3.1 Memo Pad Test...

  • Page 81: Figure 5-1. System Check-Out Flowchart

    Figure 5-1. System Check-Out Flowchart System Service Manual...
  • Page 82 (automatic fine tuning must be OFF) for channel 2 or 3, whichever channel the Console is switched. Observe the television screen, in the Memo Pad mode, for any of the following conditions: • Herringbone pattern • Snowy Picture ATARI Personal Computers...
  • Page 83 8. Hold 'SHIFT' key down and press any alphabet character to display upper case alphabet character on television screen. 9. Press the inverse video key (key with ATARI logo) then type any character to check inverse video feature. 10. Hold down 'CTRL' (Control) key and press '↓' key and observe that the cursor moves down on the television screen.
  • Page 84 1. Set System Power ON/OFF switch to OFF. 2. Open Program Cartridge door and insert Stand Alone Test Program Cartridge in left cartridge slot (800 Console only, 400 Console only has one cartridge slot). Close Program Cartridge door. 3. Plug the Peripheral Port Jumper Assembly into the side peripheral port.

  • Page 85: Figure 5-2. Stand Alone Test Special Tools

    Figure 5-2. Stand Alone Test Special Tools System Service Manual...
  • Page 86 Tests. VIDEO TESTS The video test consists of a series of three tests designed to check video display, color adjustment, and screen luminosity. A = ANY VIDEO TEST ATARI Personal Computers 1. Enter Command Letter 'A', carriage return (or spacebar).

  • Page 87: Figure 5-3. Any Video Test Screen Display

    2. Refer to Figure 5-3, for correct screen display. • Check the V’s in the upper right of the screen to be sure they are not inverted. • Observe if any of the vertical bars are missing or appear in a different sequence than Figure 5-3 Figure 5-3.

  • Page 88: Figure 5-4. Graybar Test Screen Display

    If the color bars are identical then the Video Test is Complete and proceed to the RAM TEST. Colorbar Adjustment Procedure 1. The 400 Console should remain powered-up and the Color Bar Test entered. 2. The 800 Console must be powered down and the Cartridge Door assem-...

  • Page 89: Figure 5-5. Color Bar Test Screen Display

    Initialize Color Bar test to display screen format 3. Turn the Console 180 degrees to provide access to the back of the Console. 4. Refer to Figure 5-6 for the 400 ConsoleT and to Figure 5-7 for the 800 Console when performing the following steps. •...

  • Page 90: Figure 5-6.400 Console Color Adjustment

    5. Once adjusted, reassemble the 800 Console and proceed to the RAM Test. If unable to adjust the color bars refer to paragraph 5.4, Troubleshooting. Figure 5-6. 400 Console Color Adjustment RAM TEST The RAM Test utilizes six different tests to verify the operation of the RAM Memory boards.

  • Page 91: Figure 5-7. 800 Console Color Adjustment

    Figure 5-7. 800 Console Color Adjustment Enter Command Letter 'D', carriage return spacebar), Display Options. 3. Enter Command Letter 'E', carriage return (or spacebar), to dis- play Error Table. 3. Enter Command Letter 'C', carriage return (or spacebar), to enable continuous testing.

  • Page 92: Figure 5-8. Ram Test Matrix Screen Display

    32K. Figure 5-8. RAM Test Matrix Screen Display PORT TEST This is a test of the ability of the 400/800 Computer Consoles to communicate with the outside world through the Hand Controller ports and the Peripheral port.
  • Page 93 2. Enter Command Letter 'E', carriage return (or spacebar), to dis- play Error Table on screen. 4. Enter Command Letter 'C', carriage return (or spacebar), to initi- ate continuous testing. 2. Enter Command Letter 'P', carriage return (or spacebar), to initi- ate PORT Test.

  • Page 94: Figure 5-9. Port Test Error Table Screen Display

    The following table provides a list of possible failures at different points in the power-up sequence and preceeding test procedures. The table will list the failure, probable cause and the appropriate test procedure to isolate the problem to a printed circuit board or inte- grated circuit. ATARI Personal Computers 5-17...

  • Page 95: Table 5-1. Troubleshooting Guide

    Table 5-1. Troubleshooting Guide Description Possible failure Test Procedure MEMO PAD TEST • Green Screen Loose dirty • Black Screen contacts with RAM • Random Characters or CPU boards Screen • Unit Locks Up Motherboard • Character begin scrolling across screen VISUAL INSPECTION •...
  • Page 96 Screen, Black Screen, Random Characters on Screen, or Unit Lock-Up. This procedure assumes that the System Power ON LED is lit and the screen exhibits some symptom of Console control. If these two condi- tions do not exist proceed to Troubleshooting - Procedure Number Two. ATARI Personal Computer 5-19...

  • Page 97: Figure 5-10. 400 Console, Assembled Without Casting

    Proceed with the following steps to troubleshoot the system: 1. Disassemble the Console using the instructions outlined in para- graph 5.5 for the 400 Console, and paragraph 5.6 for the 800 Con- sole. 2. Clean the RAM Memory PCB and CPU PCB contact fingers per the instructions outlined in paragraph 5.2.1, PCB Contact Cleaning and...

  • Page 98: Figure 5-11. 800 Console, Assembled Without Casting

    PCB is not the problem. Proceed with the following steps to isolate the faulty PCB: 1. Disassemble the Console using the instructions outlined in ATARI Personal Computers 5-21,paragraph 5.5 for the 400 Consoler and paragraph 5.6 for the 800 Console.
  • Page 99 The following is a list of guidelines to aid in the troubleshooting of faulty printed circuit boards: • Use only known good spares for substitution. • After each printed circuit board is suhstitutedr retest system to determine if the problem has been Corrected. •...
  • Page 100 5.4.4 Integrated Circuit Replacement Procedures The results recorded during the System Check-Out procedures can pin-- point a failing integrated circuit on a printed circuit board. Indi- cations from the System Check-Out can point to failing integrated circuits on three ATARI Personal Computers 5-23...

  • Page 101: Figure 5-12. Ram Memory Board Locations, 8K

    Same Date Codes • Same Manufacturer Figure 5-12. RAM Memory Board Locations, 8K Review the notes you made during the RAM TEST, rows D and E of the test indicate which chip failing during test, example: ATARI Personal Computers 5-24...

  • Page 102: Figure 5-13. Ram Memory Board Locations, 16K

    Memory Bits Row D Row E Replace Chip Z506 Z505 Z507 Z509 Z508 Z510 Z511 Z512 The above example would indicate that chip Z505 is failing the RAM Test and should be replaced. Before replacing any chips on the RAM Memory board the following troubleshooting hints should be read.

  • Page 103: Figure 5-14. Cpu Printed Circuit Board, Locations

    Use only known good chips and leave substituted chips in the printed circuit board until the failing chip is identified. • Test printed circuit board in system after each chip is replaced to determine if failure continues. ATARI Personal Computers 5-26...
  • Page 104 • Before a chip is changed or a board is added to or removed from the system, power the system down. 5.4.5 Motherboards The 400 and 800 Motherboards contains several integrated circuits with many diverse functions. Each integrated circuits is explained briefly, to let you choose the correct chip to replace.
  • Page 105 Figure 5-15. 400 Console Motherbqard~ Locations ATARI Personal Computers 5-28...

  • Page 106: Figure 5-16. 800 Console Motherboard, Locations

    Figure 5-16. 800 Console Motherboard, Locations 800 Motherboard • A101 POKEY chip - Used to control POT lines, audio signal, keyboard information lines as well as printer and floppy control lines. The PORT Test indicates a defective POKEY chip by displaying '1' in Rows G, H in any position.
  • Page 107 5.5 DISASSEMBLY, 400 COMPUTER CONSOLE This paragraph describes the procedures required to disassemble the 400 Computer Console. Proceed after reading the following notes. 1. Be very careful about mixing screws. The Plastic and aluminum parts will easily strip if the wrong size screw is used.

  • Page 108: Figure 5-17. 400 Console, Bottom Cover Screw Location

    Figure 5-17. 400 Console, Bottom Cover Screw Location 2. Keyboard removal, refer to Figure 5-19 • Remove single Keyboard screw (no. 6 32x1/4) • Raise left end of Keyboard and disconnect Keyboard Ribbon Cable 3. Power Supply Removal, refer to Figure 5-20 o Disconnect RF Cable from Power Supply •...

  • Page 109: Figure 5-18. 400 Console, Top Cover Removal

    Figure 5-18. 400 Console, Top Cover Removal Figure 5-19. 400 Console, Keyboard Removal ATARI Personal Computers 5-32...
  • Page 110 • Close and latch Cartridge Door • Set Module Assembly on its back • Remove eight screws (no. 6 32x3/8) from Bottom Shield and lift off 4. Lift Motherboard assembly out of Aluminum Casting • Gently unplug CPU and/or RAM Memory board •...
  • Page 111 • Raise front-end Qf Module Assembly one inch out of Top Cover and disconnect Keybnard cable. • Rotate Cartridge Door latches to the inside to clear Top Cover. • Lift Module Assembly out of Top Cover ATARI Personal Computers 5-34...

  • Page 112: Figure 5-20. 400 Console, Power Supply Removal

    Figure 5-20. 400 Console, Power Supply Removal 5-35 System Service Manual...
  • Page 113 Figure 5-21. 400 Console, Bottom Cover Removal ATARI Personal Computers 5-36...
  • Page 114 Figure 5-22. 800 Console, Cartrige Door Assemly Removal 5-37 System Service Manual...
  • Page 115 Unplug RF Cable from Power Supply board • Unplug Power Supply Harness • Remove three screws (no. 6 32x5/16) from Power Supply board • Lift Power Supply board straight up CAUTION Be careful not to bend pins of Keyboard Cable ATARI Personal Computers 5-38...

  • Page 116: Figure 5-24. 800 Console, Keyboard Removal

    Figure 5-24. 800 Console, Keyboard Removal 5. Access to CPU Printed Circuit Board, refer to Figure 5-27 • Set Module Assembly on its back • Remove nine screws (no. 6 32x5/8) from Lower Shield • Lift Motherboard Lower Shield aluminum casting •...

  • Page 117: Figure 5-25. 800 Console, Module Assembly Removal

    Figure 5-25. 800 Console, Module Assembly Removal 5.7 ASSEMBLY, 400 COMPUTER CONSOLE The following paragraphs outline the steps required to re-assemble the 400 Computer Console and its related printed Circuit boards. 1. Module Assembly re-assembly, refer to Figure 5-21 •...

  • Page 118: Figure 5-26. 800 Console, Power Supply Removal

    Figure 5-26. 800 Console, Power Supply Removal Figure 5-27. 800 Console, CPU Printed Circuit Board Removal 5-41 System Service Manual...

  • Page 119: Figure 5-28. 800 Console, Motherboard Removal

    Plug Speaker cable into Motherboard (no polarity) and set Speaker in Bottom Cover • Plug Keyboard ribbon cable into connector on Motherboard • Gently lower Keyboard over the Power-ON LED and guide posts on Aluminium Casting Figure 5-28. 800 Console, Motherboard Removal ATARI Personal Computers 5-42...
  • Page 120 3. Power Supply installation, refer to Figure 5-20 • Align Power Supply over Motherboard connector pins and Bottom Cover guide posts and gently press down. • Install Interlock Switch Plunger into Aluminum Casting. Make sure the lower end of the Plunger is positioned over the Interlock switch and the Plunger shaft rides in its' notch in the Power Supply Heat Sink.
  • Page 121 Motherboard pins Power Supply connector • Set Power Supply over guide pins on Aluminum Casting and gently press down • Insert three screws (no. 6 32x5/16) in Power Supply board • Reconnect Power Supply harness ATARI Personal Computers 5-44...
  • Page 122 CAUTION Plug in Power Supply harness cable with orange or purple wire towards Aluminium Casting • Plug RF Cable, short tipped end, into Power Supply jack. 5. Module Assembly installation into Top Cover, refer to Figure 5-25 • Set Top Cover on its back •...
  • Page 123 Set Cartridge Door assembly down on Top Cover and slide to the rear to engage tćm slots in the Aluminum Casting • Lock Cartridge Door assembly down with the two clamps next to the Program Cartridge slots. ATARI Personal Computers 5-46...
  • Page 124 ATARI parts distribution center. Information will also be presented to explain the procedures required to correctly fill out the Part Repair Tag, for both Warranty work and Non-Warranty work. 6.2 SPARE PARTS LIST...
  • Page 125 ATARI Personal Computers 6-1 Description Part No. Quantity C omponents - Integrated Circuits (Cont.) 74LS244 CO14313 74LS158 CO14345 74LS00 CO14341 74LS09 CO14341 Transistor Array CO10174 74LS243 CO14347 74LS32 CO14362 Components - Other Operators Manual CO14769 Operators Manual CO14768 Keyboard 800...
  • Page 126 Colorbar Test, 5-10 Connecting Television Monitor, 2-4 Connecting the AC Power Adapter, 2-4 Connecting the ATARI 810 and 815 Disk Drive, 2-7 Connecting the ATARI 820 and 822 Printer, 2-7 Connecting the ATARI 825 Printer, 2-10 Connecting the ATARI 830 Acoustic Modemr 2-10...
  • Page 127 Functional Description, 1-3, 4-1 General Information, 1-l, 1-3 Graybar Test, 5-10 How to Use This Manual, l-2 Inserting Program Cartridges, 2-4 Installation, 1-3 Integrated Circuit Replacement Procedures, 5-24 Introduction, 1-l, 2-1, 3-1, 5-l, 6-1 Keyboard and Screen Editor Functions, 3-2 Keyboard Test, 5-6 List of Effective Pages, 1-4 Maintenance, 1-3, 5-1...
  • Page 128 Troubleshooting – Procedure Number One, 5-20 Troubleshooting – Procedure Number Three, 5-23 Troubleshooting - Procedure Number Two, 5-21 Troublestnuoting Guide, 5-17 TV Switch Box, 1-7 Unpacking, 2-1 Using the ATARI 850 Interface Module, Video Tests, 5-9 Visually Inspecting the Computer Gonsoles, 5-3 ATARI Personal Computers...
  • Page 129 WARNING Statement, 1-6 With Program Cartridge, 3-1 Without Program Cartridge, 3-1 Revised & updated by jer 2013-28-03 System Service Manual...

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