Atari 400 Field Service Manual

* *
NOTE
*
*
Avoid
touching the
contact after cleaning.
3.
If corrosion or residue remain
on the
contacts it
is necessary
to
clean
the
contacts further
using the board cleaning brush.
Use the
following
procedures-
•
Moisten
the board cleaning brush with solvent
and firmly
brush the
contacts.
Four
to
six strokes
is enough. Be
careful and do not touch
any other part of the board.
• Perform
step 2 again.
*.
Dip the
acid brush into the lubricant.
5.
Apply
an
even
coating of
lubricant to the
contact fingers
on both sides of
the
PCB.
The
coating of lubricant
should be thick
enough
to
protect
the
contact
fingers from
corrosion- Do not
spread the
lubricant to areas
other
than
the
contact fingers.
VISUAL
INSPECTION
The
following
instructions
explain
specific areas
to check
on the Consoles
for damage
or abuse.
1.
Inspect
the
controller
jacks and
peripheral
jacks for broken
and/or
bent
pins.
2.
Check
the RF
cable for
cracks in the
insulation,
bare,
or pinched
areas.
3.
With
the console
power ON
and MEMO
PAD
on the
screen,
open the
cartridge
door to
check the interlock
switch.
Usinj^ a small
blade
screwdriver,
press the
plunger
down. Release
the plunger
and see that it Is
returns
to its open
position. In
its open
position the
console
is powered-
down.
^. Inspect
the
cartridge slot
for foreign
objects or
damage.
5. Inspect
the power
jack
for bent
and/or damaged
pins.
If
any of the
above
damage
is found,
repair
the defective
area. Use
the disassembly
and assembly
instructions
at the
beginning
of this section.
Atari
Home
Computer
i^-21

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)