Atari CX - Page 184

Consumer Product Service
Manager of TechkA SuFport
TECH TIP
number
VCS
SUBJECT:
MODEL:
5200
Printed Circuit Board (CAO 18087)
DATE: june 6, 1983
I
PROBLEM AND SOLUn0E)r
Some 5200 units display a blank dark screen or a screen with garbled information. The
probable cause for either of these symptoms is an intermittent solder short (bridge) on
the
PCB betwm the' A0 Address line .trace and the fetdthru pad of the REF Line trace
(near connector J 1).
TROUBLESHOOTING:
8
The problem has ken seen to occur during one of the following three instances
1)
When the system is powered-up - the screen is usudly blank and dark.
2)
After the system is powered-up with a cartridge in place - the screen will
display random garbled data.
3)
Either of the above can be seen when th; PCB is moved or siightiy flexed
near connector Jlw
SOLUilON:
To remedy the problem, perform the following five procedures in the exact order given:
Turn off power, and disconnect AC and interconnect cables.
Disassemble
unit to expose the component side of the (CA018087).
Locate connector 31, the adjacmt A0 Address trace and the fnd-thru pad
of the REF Tace (See Figure I).
Carefuliy remove the excess solder from the pad and wipe the area dean.
Inspect the pad and if necessary use an X-o knife to cut a shallow groove
between the A0 Address Line and the feedthru pad. Be very carefuly not
nick or cut the trace adjacmt m the pad.
Reassemble and test the unit