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

RAM TEST

Purpose:
•
For mat: This test takes approximately lO seconds during which the screen
•
is solid black.
Failure Code number appears on the screen to signify which chip is
defective.
(Table 3- 1 ).
U 1 6, U 1 7 , and U28 for PCB flCA0 1 8 087 .
A 1 4, A 1 5, A 1 6 and A 1 7 .
No Diagnostic F lowchart Entry Point
VERIFY OS ROM
Purpose:
•
Format: If error code 30 appears on the Error Summary (Figure 3-5) the
•
ROM chip is defective. Replace the defective chip and restart the test.
as
No D iagnostic Flowchart Entry P oint

PORT TEST

Purpose:
•
associated PORT circuitry.
For mat:
•
Summary (Figure 3-5).
Diagnostic Flowchart Entr y Point: ( Refer to Table 3-1 , D iagnostic Error Codes).

TONE TEST

Purpose: To check the audio generation section o f the POKEY (U7).
•
For mat:
•
(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 F lowchart Entry P oint: Pg. 4-2 7 .
CX5 200 Field Service M anual
To test the 16K RAM chips for proper functioning.
At the end of this time period, if the test has failed, a
Swap out the chip corresponding to the Diagnostic Error Code
If this does not so lve the proble m ,
To test the ROM (U8) for proper functioning.
as
This test checks the function s of the POKEY, GTIA and
The test is done internally with failures appearing on the Error
The screen prints at the botto m which register is being tested
3 - 1 0
swapout the chips U 1 5 ,
For P CB flCA020 1 08, swapout