Atari 400 800 Field Service Manual June 82
The ATARI Home Computer Field Service Manual 400/800 is Atari, Inc.'s service manual for the Atari 400 and Atari 800, dated June 1982. Atari's later Tech Tip 10 (22 February 1983) refers to it as document FD100001. The scan has 219 pages and no text layer, so it cannot be searched; values have to be read from the page images.
Contents
[edit | edit source]| Section | Title | Contents | PDF pages |
|---|---|---|---|
| 1 | Theory of operation | User interface; mechanical description of the seven modules (motherboard, CPU board, ROM personality board on the 800, RAM boards, keyboard, power supply board, program cartridge); device-by-device discussion of the 6502, ANTIC, CTIA/GTIA, POKEY, PIA, memory map and I/O decoders, and the power supply; pin assignment figures; flow diagrams for each board | 13–40 |
| 2 | Silkscreens and schematics | 400 motherboard and power supply, 800 motherboard, power supply and personality board, CPU board, 8K and 16K RAM boards. The 400 power supply schematic is Figure 2-4 on p. 2-8 | 41–62 |
| 3 | Testing and troubleshooting | Power-up, keyboard, RAM and ROM tests without test equipment; the SALT II cartridge menu and its tests (colour bar, any video, grey bar, keyboard, switch, tone, display options, port, verify ROM, RAM, memory, Star Raiders, shake, burn-in); Tables 3-1 to 3-3 (port test legend, defective RAM boards, defective RAM identified) | 63–84 |
| 4 | Disassembly/assembly maintenance | The 400 and the 800 separately, in removal and installation order, ending with PCB contact cleaning and lubricating | 85–105 |
| 5 | 400 diagnostic flowcharts | Power-up, colour bar, TIA, grey bar, any video, keyboard, tone, verify ROM, RAM and port procedures; Table 5-1 clock circuit (p. 5-36), Table 5-2 defective RAM boards, Table 5-3 port test legend | 107–146 |
| 6 | 400/800 symptom checklist | Symptoms, possible causes and flowchart entry points (pp. 6-1, 6-2) | 147–148 |
| 7 | 800 diagnostic flowcharts | As Section 5 for the 800, with Tables 7-1 to 7-3 | 149–188 |
| 8 | Game controllers | Joystick and paddle: construction, schematics and check procedures | 189–193 |
| 9 | Parts list | 400 computer (pp. 9-2 to 9-6) and 800 computer (from p. 9-7), by assembly, with Atari part numbers, descriptions and locations | 194–207 |
| 10 | Service bulletins | Upgrade Bulletin 1, GTIA chip (28 May 1982); Tech Tip 2, Revision B operating system ROMs (28 May 1982); Tech Tip 10, 400/800 system lock-up (22 February 1983) | 208–217 |
The last two pages of the scan are advertisements from Electronic Dimensions of San Luis Obispo, California, for reprinted Atari 1050 and 800XL service manuals.
What it settles
[edit | edit source]Section 9 is a component-level parts list. It covers the power supply board as well as the motherboard, CPU and RAM cards, with each capacitor's type, value and voltage against its designator. Together with Figure 2-4 it documents the 400's internal supply: 9 V AC in, a bridge rectifier, a 7805 with a 33 Ω 2 W resistor across it for +5 V, a voltage doubler and a 78M12 for +12 V, and a −5 V supply that includes the power LED.
Table 5-1 gives the clock frequencies at named pins (1.789 MHz and 3.579 MHz), and the symptom checklist in Section 6 maps each symptom to designators on each board.
Section 8 describes the joystick as five calculator-type keypads on a small board, four under the stick and one under the button, and gives the paddle as a 1 MΩ potentiometer.
What this manual does not contain
[edit | edit source]- A text layer, so nothing can be searched and OCR of the parts list is not reliable enough to quote from.
- The XL or XE machines. For those see Atari 1200XL Field Service Manual, Atari 600XL Field Service Manual, Atari 130XE Field Service Manual and Atari 800XL Service Manual.
- Monitor, disk drive or printer service.
- Voltage tolerances for the internal rails; the flowcharts check only for presence of +5 V, +12 V and −5 V.
Pages that cite this document
[edit | edit source]- Atari 400: chip locations and part numbers, supply rails, tests
- Atari 400 General Maintenance, Atari 400 Troubleshooting Guide, Atari 400 Capacitor Replacement Guide
- Atari 800, Atari 800 General Maintenance, Atari 800 Capacitor Replacement Guide