Atari 400 Service Manual

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
Lubrication.
3. Assemble the individual boards to operate the system out of the
casting, see Figures 5-10 and 5-11. Refer to paragraphs 5.7 and 5.8
for assembly instructions. Plug low voltage power adapter into the
System Power jack.
4. Perform System Check-Out, refer to paragraph 5.3.
NOTE
Television screen interference is normal when the system is
operated without the aluminum casting.
4. If the system will not power-up properly, proceed to Troubleshoot-
ing Procedure Number Two.
Figure 5-10. 400 Console, Assembled Without Casting
5-20 System Service Manual

Atari 400 Specifications

General

Manufacturer	Atari
Model	400
Type	Home Computer
Release Year	1979
CPU	MOS Technology 6502
CPU Speed	1.79 MHz
ROM	10 KB
Operating System	Atari OS
Keyboard	Membrane keyboard
RAM	8 KB (expandable to 48 KB)
Graphics	ANTIC and GTIA chips
Sound	4 channels
Display	RF output for connection to TV
Storage	Optional cassette tape drive or floppy disk drive
Ports	Cartridge
Display Resolution	320x192 (16 colors)