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Atari Technical Bulletin
Number: TT30-0005
Date: April 2, 1992
Page 1 of 2


Product(s) Affected:	TT030
Model:				All
Type of ATB:			As Needed
ECO #: 				1428

Reason for ATB:

To reduce noise and jitter seen on the high resolution monitor.


Notes:

This problem only affects two main PCB FABs. They are as follows:

FAB				REV

C301763-001		D
C302406-001		A

Symptoms of Problem:

Video jitter on high reolution TT Monitor.


Solution:

1.	Remove the top cover of the TT030.

2.	Remove the VME Card Guide.

3.	Locate the 8530 circuit. See Figure 1 on page 2.

4.	Connect a 15pF capacitor from the left side of CD01 to the top left corner of the ground ring. See Figure 1 on page 2.

5.	Re-assemble the unit.

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Atari Technical Bulletin
Number: TT30-0005
Date: April 2, 1992
Page 2 of 2

GROUND RING

15 pF Cap

CD02

CD01

RD02

CD06

CD08

CD03

CD05

UD00

RD04

LD00

CRD00

CD04

CD07

CD09

Figure 1