Atari 400 800 Field Service Manual June 82

The ATARI Home Computer Field Service Manual 400/800 is Atari's own field service manual for the Atari 400 and Atari 800, June 1982. 219 scanned pages. The scan has no text layer, so it cannot be searched and values must be read from the page images.

Contents

Atari's own section list:

• 1 Theory of operation — user interface; 400/800 mechanical; central processing unit; ROM personality PCB; RAM PCB; keyboard; power supply; program cartridge; then the electronic discussion, device by device: the 6502 CPU, ANTIC, CTIA, GTIA, the I/O decoder, composite video, the 400 console motherboard, POKEY, the PIA, the key-in/key-out circuit, the memory map decoder, the bi-directional data buffer, the ROM personality board, the power supply, the ROM cartridge, and the accessories (AC power adaptor, TV switch box, the BASIC program cartridge)
• 2 Silkscreen and schematics
• 3 Troubleshooting and testing — with and without the SALT II diagnostic cartridge; power-up, keyboard, RAM and ROM tests; the SALT II menu and each of its tests: colour bar, any video, grey bar, keyboard, switch, tone, display options, port, verify ROM, RAM, memory, Star Raiders, shake and burn-in; plus production test, boot B, examine and adjust
• 4 Disassembly/assembly maintenance — the 400 and the 800 separately, each in removal and installation order, ending with PCB contact cleaning and lubricating (tools required, procedure, visual inspection)
• 5 400 diagnostic flowcharts
• 6 800/800 symptom checklist
• 7 800 diagnostic flowcharts — including a RAM error-counter table that maps a fault indicator to the specific defective RAM device by Z-number, separately for 16K and other configurations
• 8 Game controllers — joystick (X-Y controller) and game paddle: how each works, schematics, and Atari's own check procedure for each
• 9 Parts list — 400 computer and 800 computer, listed separately
• 10 Service bulletins

What it settles

Section 9 is a real component-level parts list. It is laid out as assembly, Atari part number, description and location, and covers the power supply board as well as the main board — so, unusually for a machine of this period, the 400's internal supply is documented at component level rather than being carried as a single exchange item. Capacitors appear with type, value and voltage rating against their designators.

Section 7's RAM error-counter table is the other item worth knowing about: it converts a diagnostic indication into a specific socket rather than leaving the reader to swap devices.

Section 8 gives the joystick's real mechanism — five calculator-type keypads on a small PCB, four under the stick and one under the button, with diagonals produced by two closing at once — and states that the game paddle is a 1 MΩ potentiometer. Atari notes that earlier joysticks had a spring-loaded button.

What this manual does not contain

• No text layer, so nothing can be searched and OCR of the parts list is not reliable enough to quote from. Read the page images.
• No coverage of 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.
• No monitor or television coverage beyond the TV switch box and the RF modulator.
• No disk drive or printer coverage.
• The SALT II diagnostic cartridge is assumed available; section 3 also gives the tests that can be run without it.

Pages that cite this document

• Atari 400 · Atari 400 General Maintenance · Atari 400 Troubleshooting Guide · Atari 400 Capacitor Replacement Guide
• Atari 800

Download here: Atari_400_800_Field_Service_Manual_June_82.pdf