Atari 800 Field Service Manual

800 GREY BAR
TR0U3LESH00TING
(cont)
Verify
that each of the following levels
and/or
signal wave
forms exist before proceeding to
the
next step. Us* SALT II, COLOR 5ARS,
locked into the continuous mode.
Is
there
3.5SMHz
oseiUatian at R106
on Motherboard
R*f-r
Figure
NO Swap-out
XIOI.
Q102
and Q103
YES
Is there input
signal
to
base of
QIOS. Pin 2 Refer
Figure
NO
Trace circuit
back to
previous
step
YES
Is
there
output
signal from emitter
of
Q105 Refer
Figure
NO Trace circxiit
back to
previous step
YES
Is
there
signal at
JUS. Pin 20
Refer Figure
NO Trace circuit back
YES
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Computer
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Atari 800 Specifications

General

Processor	MOS Technology 6502
Processor Speed	1.79 MHz
ROM	10 KB
Graphics	ANTIC and GTIA chips
Release Year	1979
Display Resolution	up to 320 x 192
Colors	128 colors
Sound	4 channels
Storage	Cartridge, cassette, floppy disk
Ports	Cartridge, serial, monitor
Operating System	Atari OS