Atari 1025 Field Service Manual page 51

SECTION
FIVE
1025
DIAGNOSTIC
FLOWCHART
This Diagnostic Flowchart was
designed
to
be easy
to
use and the primary
aid
when
troubleshooting the electronic operations
of the 1025.
When
a
line
terminates with
a
letter inside a
circle, locate the chart that begins with that
letter
in
a
circle
and
continue the
diagnosis.
The
flowcharts are arranged
in
alphabetical order.
The
disassembly procedures referenced
in
the flowchart are found
in
Section
4.
SWAPOUT PROCEDURES
Many
places
in
the diagnostic flowchart, a
box
tells
you
to
"swapout" a
chip
or
a
number
of chips
in
a
particular order.
The
"swapout"
instruction
means
that you
should
replace the
indicated components
one
at a
time with
a
known
good
component
of
the
same
type.
The
1025 should then be
tested with the
new, known-
good component
in
place
to see
whether
the "swapout"
solved the problem
being
checked.
If
the
swapout
did not
fix
the problem, the known-good component
should
be
left
in,
and
the next component
inserted.
Once
the problem
is
solved,
you
then
place the suspected bad chips
one by one
into the
system
to
determine whether
or
not those
you
pulled out are
truly defective.
In this
way, you
avoid needlessly
replacing
good components.
CAUTION
Extreme
care should be taken when
handling the integrated
circuit chips.
They
are
all
very
sensitive to static electricity
and can
easily
be
damaged
by
careless
handling.
Always keep
the chips
in
their plastic carrier
tubes
or
on conductive
foam when
not handling them.
Make
certain you are
well grounded when
handling
the
chips. Atari strongly recommends
that you wear a
conductive grounding band
(which
ties
from
your
arm
to
ground)
when
handling the
chips.
The
chips are also susceptible to
damage
from
stress
when
being
removed from
or
inserted into the sockets.
Always
use a
chip-puller
when
removing
the
chips.
Do
no
*
pry chips out with
a
screwdriver or
any
other
tool.
Failure
to follow the above
guidelines results
in
unusually high chip
failure rates
and extra expense.
Should a problem
persist despite your having followed
all
of
the prescribed
repair
procedures,
call
the
ATARI
Techline
Specialist:
Inside California
(800)
672-1466
Outside
California
(800)
538-1535
Atari 1025
Printer
Field Service Manual
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