Atari CX 5200 Field Service Manual page 52

GRAY BAR
TEST
Purpose:
•
L M 3 ) from the GTlA chip.
Procedure : P ress key 3 followed by STA RT.
•
Format: Eight horizontal gray bars are displayed, going from black at the
•
top to white at the bottom in even steps (see Figure 3 A-2).
should be steady and unchanging. These lines may have minor glitches on
their edges.
bar. No color should appear anywhere on the screen. The areas a bo ve the
top (black) bar and below the bottom (white) bar are of no i m portance to
the test.
that there is no flashing of any color or shifting of the gray bars.
D iagnostic F lowchart Entry Point: Pg. lj. A- 1 6.
CX5200 Field Service Manual
To test the functioning of the luminescence lines ( L M 1 , L M2 ,
A thin white line always appears just over the top (black)
This test should be left on for at least ten seconds to ensure
F igure 3 A-2. Gray Bar S creen
3 A-5
The screen
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