Ram Test; Rom; Port Test; Tone Test - Atari CX 5200 Field Service Manual

RAM
TEST
•
Purpose:
To
test
the
16K
RAM
chips
for
proper functioning.
•
Format:
This
test
takes approximately
10
seconds during which
the screen
is
solid black.
At
the end
of
this
time
period,
if
the
test
has
failed,
a
Failure
Code number
appears on the screen
to
signify
which
chip
is
defective.
Swap
out the chip
corresponding
to the
Diagnostic Error
Code
(Table
3-1).
If
this
does not solve the problem, swapout
the chips U15,
U16, U17, and
U28
for
PCB
//CA018087.
For
PCB
#CA020108, swapout
A14, A15,
A16 and A17.
No
Diagnostic
Flowchart Entry Point
VERIFY OS
ROM
•
Purpose:
To
test
the
OS
ROM
(U8) for
proper
functioning.
•
Format:
If
error
code
30
appears on
the Error
Summary
(Figure 3-5) the
OS
ROM
chip
is
defective.
Replace the defective chip and
restart the
test.
No
Diagnostic
Flowchart
Entry Point
PORT
TEST
•
Purpose:
This
test
checks
the functions
of
the
POKEY,
GTIA
and
associated
PORT
circuitry.
•
Format:
The
test
is
done
internally
with
failures
appearing on the Error
Summary
(Figure
3-5).
Diagnostic Flowchart Entry
Point:
(Refer
to
Table
3-1,
Diagnostic
Error Codes).
TONE
TEST
• Purpose:
To check
the audio generation section of the
POKEY
(U7).
•
Format: The
screen prints at the
bottom which
register
is
being tested
(Register
4, 3, 2,1).
A
series of eight tones will
sound on each
register.
The
first
two
tones
may
be
inaudible but you can hear the speaker
click.
Diagnostic
Flowchart Entry
Point: Pg. 4-27.
CX5200
Field
Service Manual
3-10